From patchwork Mon Sep 12 19:07:52 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jagath Jog J X-Patchwork-Id: 605055 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EDF71C6FA83 for ; Mon, 12 Sep 2022 19:08:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230202AbiILTIE (ORCPT ); Mon, 12 Sep 2022 15:08:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56702 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229916AbiILTID (ORCPT ); Mon, 12 Sep 2022 15:08:03 -0400 Received: from mail-pf1-x42c.google.com (mail-pf1-x42c.google.com [IPv6:2607:f8b0:4864:20::42c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3517342AEF; Mon, 12 Sep 2022 12:08:03 -0700 (PDT) Received: by mail-pf1-x42c.google.com with SMTP id j12so9519050pfi.11; Mon, 12 Sep 2022 12:08:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=references:in-reply-to:message-id:date:subject:cc:to:from:from:to :cc:subject:date; bh=ZMDXrfVZs/FU6NF5M/gBqbkEPLHG1eBQo8h/hDTaUCg=; b=X+P6BlT/TgB+VgH4TuMHIRPPPLlu9hFPNmvGQbx25k/DL0wJT6dThcKawGEizioFpJ Xt3desz9OjLRcHYn5ONBMRZcZ2EDdceqrasVC1d94noPmls9MW9Jp9NddnLI/EQM4TFj uzjAqXKNB4Ya+rLP44TGEogUCDLEBFlcoFAZOkQvCy2VtyTZUnw7NlsXjTH2RrPoIh8O aevgPeUoFLeEeylTJoD9Jb3rYkaiXMxfgR6lHhX+E5IKoILkD2VJH40uHYFxk3FQlamx WekZZnUArJCqTPjPsedPxXu0689R2o1rqIFSkiyzsmQw+kol+vBsSQkCmliZYwZzFEzk e3vw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=references:in-reply-to:message-id:date:subject:cc:to:from :x-gm-message-state:from:to:cc:subject:date; bh=ZMDXrfVZs/FU6NF5M/gBqbkEPLHG1eBQo8h/hDTaUCg=; b=kPhcMuec841JKgXnBIg1C/fG/GYhxhKHqd/5lHn53LaIICC5B6sFQbfYYZUKOfF1FJ TgOBTVLurN9Ljqd7WcTQq8o/GlTLubY6zGcqMeqZ3JN/EBWXawQ/ipiN5ihEYdDGuTsh esJw+nxZzVmwEvOKssVzsIiaDgdNhOzfV0h1t+ka7sYMyadkCV46tu3AOicH+VKpviqG XLWjl+TOCSugopqP+mppqPOEqL98zLvjGoE63eDsStCeBsjC1iZaFou7aLbYj63RCZt/ DAE4xKqszaKQ2K56tlh5L0OEECn0xBvmHVS0v0gHrMe2M6gYMfKC5N9ITWIroF6Uel7q sZXg== X-Gm-Message-State: ACgBeo023XOsjOxl/4Nw58ay7J6d1pPC24t9l70z7JZdH3yKWFTGmOpv /eO+0nT7WeSiYxPOf42kRLumbikCev8= X-Google-Smtp-Source: AA6agR7nSrHh2h4kB2kKYTa0py2r+eQGRLobPUH2fZSgan4UTOTKUgTS7ZHzYVmWUxmM2RmPNQXmCg== X-Received: by 2002:a63:d80f:0:b0:438:69c7:7df7 with SMTP id b15-20020a63d80f000000b0043869c77df7mr17769857pgh.261.1663009682475; Mon, 12 Sep 2022 12:08:02 -0700 (PDT) Received: from localhost.localdomain ([116.73.241.66]) by smtp.gmail.com with ESMTPSA id 68-20020a630547000000b00434272fe870sm1091889pgf.88.2022.09.12.12.07.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 12 Sep 2022 12:08:01 -0700 (PDT) From: Jagath Jog J To: alexandre.belloni@bootlin.com, a.zummo@towertech.it, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org Cc: linux-rtc@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, jagathjog1996@gmail.com Subject: [PATCH v2 1/2] dt-bindings: rtc: add Maxim max31329 rtc device tree bindings Date: Tue, 13 Sep 2022 00:37:52 +0530 Message-Id: <20220912190753.10158-2-jagathjog1996@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220912190753.10158-1-jagathjog1996@gmail.com> References: <20220912190753.10158-1-jagathjog1996@gmail.com> Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Document devicetree bindings for the Maxim max31329 real time clock. Signed-off-by: Jagath Jog J Reviewed-by: Krzysztof Kozlowski --- .../bindings/rtc/maxim,max31329.yaml | 61 +++++++++++++++++++ 1 file changed, 61 insertions(+) create mode 100644 Documentation/devicetree/bindings/rtc/maxim,max31329.yaml diff --git a/Documentation/devicetree/bindings/rtc/maxim,max31329.yaml b/Documentation/devicetree/bindings/rtc/maxim,max31329.yaml new file mode 100644 index 000000000000..fc99f1854847 --- /dev/null +++ b/Documentation/devicetree/bindings/rtc/maxim,max31329.yaml @@ -0,0 +1,61 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/rtc/maxim,max31329.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Maxim MAX31329 Real Time Clock + +maintainers: + - Jagath Jog J + +allOf: + - $ref: rtc.yaml# + +properties: + compatible: + const: maxim,max31329 + + reg: + maxItems: 1 + + "#clock-cells": + const: 0 + + clock-output-names: + maxItems: 1 + + interrupts: + maxItems: 1 + + trickle-resistor-ohms: + enum: + - 3000 + - 6000 + - 11000 + + wakeup-source: true + + start-year: true + +required: + - compatible + - reg + +additionalProperties: false + +examples: + - | + #include + i2c { + #address-cells = <1>; + #size-cells = <0>; + + rtc@68 { + compatible = "maxim,max31329"; + reg = <0x68>; + trickle-resistor-ohms = <6000>; + #clock-cells = <0>; + }; + }; +... From patchwork Mon Sep 12 19:07:53 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jagath Jog J X-Patchwork-Id: 605506 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E2EE3C6FA82 for ; Mon, 12 Sep 2022 19:08:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230335AbiILTIO (ORCPT ); Mon, 12 Sep 2022 15:08:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56760 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230256AbiILTIJ (ORCPT ); Mon, 12 Sep 2022 15:08:09 -0400 Received: from mail-pj1-x102c.google.com (mail-pj1-x102c.google.com [IPv6:2607:f8b0:4864:20::102c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3AA804360B; Mon, 12 Sep 2022 12:08:07 -0700 (PDT) Received: by mail-pj1-x102c.google.com with SMTP id q9-20020a17090a178900b0020265d92ae3so13278992pja.5; Mon, 12 Sep 2022 12:08:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=references:in-reply-to:message-id:date:subject:cc:to:from:from:to :cc:subject:date; bh=mn4bmLafZxqM/k8xR1WPJrc2eMWAXYy3cw3/XMikQFM=; b=Cx/RfmUSNRDZ516zAInRE/phJyUmRtoZHY5uh5OBN1KZiM/iwxB59tzK+DQxbULIXN sYpPzu1PHzWnH72aCgYzoTSYOlkXnHlMMmdc2TJJZesdTZJt+CtBgWZfZcu7HzYTJHQ0 tSOGdO9bgXDf9JN0XVSVcRQS+0N0i4jEuFwFrXHGGeiT9xeAnadG5Dz0L4YrIjfXyO7k bEc1Q7Z5O4gAC/DsCDnoF3Qj+mjjM6rhgzWM35LA9YD3sgb2tQW1dJ59RJgzKarW0sa0 stymG6mCeH+7P3v/YlPyERkJbZPZM0L5/R36A9XJ0xboUqEYK/QBzg7VpuarqoXBku67 PEzQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=references:in-reply-to:message-id:date:subject:cc:to:from :x-gm-message-state:from:to:cc:subject:date; bh=mn4bmLafZxqM/k8xR1WPJrc2eMWAXYy3cw3/XMikQFM=; b=yaJSJwoBJUsQ5KCBTrrvUg76HSLJ7kMAM4aQH0INWk5M5NJTi+4ywBqZTI4syNXIbV v5yAU4a35X5VctBrItIRIrHKfrGkpjrjav5C70Bf0Gthwb4gEF8EWGcetvq2i3Dor/YT 5uQEztLeVdvJT8FZKrXTEn9uQJdJNh+wpUmOnEXkasnKRSyXH8M3fMA4enDn7H7sLrgn Y9dhoUpgbQQt/fJ9iaVM72Tuigcnu9Amfn12OrFuXchWB8nHWQXmSaTXuLmBzExTsHST c/IE0TyT3EOsV0XKdnzu9ufS9l9k0UgHbK06OJh/PrsSEFES+k67xmJv+/d6ykj49dui NWFg== X-Gm-Message-State: ACgBeo3eSenteTt9xGvaM5yPfQj6KjcUFUT7gp8uFTRvSR7uKbI5dEKV 7mq0B931W0tMK87ksq0sWqlcZz/XK4U= X-Google-Smtp-Source: AA6agR4vYLx2n0vnvovydRWMlQ2xJB/gV4mxCS8p++VWYRbC5qK+utigT9fzeI743FEoquQbFMi0Kg== X-Received: by 2002:a17:902:ccc2:b0:178:29f9:5c5c with SMTP id z2-20020a170902ccc200b0017829f95c5cmr8273322ple.19.1663009686017; Mon, 12 Sep 2022 12:08:06 -0700 (PDT) Received: from localhost.localdomain ([116.73.241.66]) by smtp.gmail.com with ESMTPSA id 68-20020a630547000000b00434272fe870sm1091889pgf.88.2022.09.12.12.08.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 12 Sep 2022 12:08:05 -0700 (PDT) From: Jagath Jog J To: alexandre.belloni@bootlin.com, a.zummo@towertech.it, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org Cc: linux-rtc@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, jagathjog1996@gmail.com Subject: [PATCH v2 2/2] rtc: maxim: Add Maxim max31329 real time clock Date: Tue, 13 Sep 2022 00:37:53 +0530 Message-Id: <20220912190753.10158-3-jagathjog1996@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220912190753.10158-1-jagathjog1996@gmail.com> References: <20220912190753.10158-1-jagathjog1996@gmail.com> Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Add support for I2C based Maxim max31329 real time clock. Signed-off-by: Jagath Jog J --- MAINTAINERS | 7 + drivers/rtc/Kconfig | 10 + drivers/rtc/Makefile | 1 + drivers/rtc/rtc-max31329.c | 535 +++++++++++++++++++++++++++++++++++++ 4 files changed, 553 insertions(+) create mode 100644 drivers/rtc/rtc-max31329.c diff --git a/MAINTAINERS b/MAINTAINERS index 7032fcb0fd0f..d92ddab0958d 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -12478,6 +12478,13 @@ F: include/linux/mfd/max14577*.h F: include/linux/mfd/max77686*.h F: include/linux/mfd/max77693*.h +MAXIM MAX31329 RTC DRIVER +M: Jagath Jog J +L: linux-rtc@vger.kernel.org +S: Maintained +F: Documentation/devicetree/bindings/rtc/maxim,max31329.yaml +F: drivers/rtc/max31329.c + MAXIRADIO FM RADIO RECEIVER DRIVER M: Hans Verkuil L: linux-media@vger.kernel.org diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index b8de25118ad0..d02cba94e121 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -393,6 +393,16 @@ config RTC_DRV_NCT3018Y This driver can also be built as a module, if so, the module will be called "rtc-nct3018y". +config RTC_DRV_MAX31329 + tristate "Maxim MAX31329" + select REGMAP_I2C + help + If you say yes here you will get support for the + RTC of Maxim MAX31329. + + This driver can also be build as a module. If so, the module + will be called rtc-max31329. + config RTC_DRV_RK808 tristate "Rockchip RK805/RK808/RK809/RK817/RK818 RTC" depends on MFD_RK808 diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index aab22bc63432..741216d2f9ca 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -97,6 +97,7 @@ obj-$(CONFIG_RTC_DRV_MAX8907) += rtc-max8907.o obj-$(CONFIG_RTC_DRV_MAX8925) += rtc-max8925.o obj-$(CONFIG_RTC_DRV_MAX8997) += rtc-max8997.o obj-$(CONFIG_RTC_DRV_MAX8998) += rtc-max8998.o +obj-$(CONFIG_RTC_DRV_MAX31329) += rtc-max31329.o obj-$(CONFIG_RTC_DRV_MESON_VRTC)+= rtc-meson-vrtc.o obj-$(CONFIG_RTC_DRV_MC13XXX) += rtc-mc13xxx.o obj-$(CONFIG_RTC_DRV_MCP795) += rtc-mcp795.o diff --git a/drivers/rtc/rtc-max31329.c b/drivers/rtc/rtc-max31329.c new file mode 100644 index 000000000000..9cee221c7576 --- /dev/null +++ b/drivers/rtc/rtc-max31329.c @@ -0,0 +1,535 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * RTC driver for the Maxim MAX31329 Real-Time Clock + * Copyright (c) 2022 Jagath Jog J + * + * Datasheet: https://datasheets.maximintegrated.com/en/ds/MAX31329.pdf + * + */ + +#include +#include +#include +#include +#include +#include +#include + +/* Register map */ +/* Config registers */ +#define MAX31329_STATUS_REG 0x00 +#define MAX31329_STATUS_A1F BIT(0) +#define MAX31329_STATUS_OSF BIT(6) +#define MAX31329_INT_EN_REG 0x01 +#define MAX31329_INT_EN_A1IE BIT(0) +#define MAX31329_RTC_RESET_REG 0x02 +#define MAX31329_RTC_CONFIG1_REG 0x03 +#define MAX31329_RTC_CONFIG2_REG 0x04 +#define MAX31329_RTC_CONFIG2_ENCLKIN BIT(2) +#define MAX31329_RTC_CONFIG2_ENCLKO BIT(7) +#define MAX31329_RTC_CFG2_CLKOHZ_MSK GENMASK(6, 5) +#define MAX31329_TIMER_CONFIG_REG 0x05 + +/* Watch registers */ +#define MAX31329_SECONDS_REG 0x06 +#define MAX31329_MINUTES_REG 0x07 +#define MAX31329_HOURS_REG 0x08 +#define MAX31329_HOURS_F24_12 BIT(6) +#define MAX31329_HOURS_AM_PM BIT(5) +#define MAX31329_DAY_REG 0x09 +#define MAX31329_DATE_REG 0x0A +#define MAX31329_MONTH_REG 0x0B +#define MAX31329_MONTH_CENTURY BIT(7) +#define MAX31329_YEAR_REG 0x0C +#define MAX31329_WATCH_SEC_LEN 0x07 +#define REG_TO_OFFSET(_REG) ((_REG) - MAX31329_SECONDS_REG) + +/* Alarm registers */ +#define MAX31329_ALM1_SEC_REG 0x0D +#define MAX31329_ALM1_MIN_REG 0x0E +#define MAX31329_ALM1_HRS_REG 0x0F +#define MAX31329_ALM1_DAY_DATE_REG 0x10 +#define MAX31329_ALM1_MON_REG 0x11 +#define MAX31329_ALM1_YEAR_REG 0x12 +#define MAX31329_ALM1_SEC_LEN 0x06 + +#define MAX31329_PWR_MGMT_REG 0x18 +#define MAX31329_TRICKLE_REG 0x19 +#define MAX31329_TRICKLE_EN BIT(7) +#define MAX31329_TRICKLE_DIODE_EN BIT(2) +#define MAX31329_D_TRICKLE_OHMS GENMASK(3, 0) + +/* Ram registers */ +#define MAX31329_RAM0_START_REG 0x22 +#define MAX31329_RAM0_END_REG 0x61 + +struct max31329_data { + struct regmap *regmap; + struct rtc_device *rtc; + int irq; +#ifdef CONFIG_COMMON_CLK + struct clk_hw clkout_hw; +#endif +}; + +/* resistance in kohms */ +static u32 max31329_trickle_ohms[] = { + 3000, + 6000, + 11000 +}; + +static const struct regmap_config config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = MAX31329_RAM0_END_REG, +}; + +static int max31329_get_osc_status(struct device *dev) +{ + struct max31329_data *max31329 = dev_get_drvdata(dev); + unsigned int status; + int ret; + + ret = regmap_read(max31329->regmap, MAX31329_STATUS_REG, &status); + if (ret) + return ret; + + if (status & MAX31329_STATUS_OSF) { + dev_err(dev, "Oscillator has stopped\n"); + return -EINVAL; + } + return 0; +} + +static int max31329_alarm_irq_enable(struct device *dev, unsigned int enable) +{ + struct max31329_data *max31329 = dev_get_drvdata(dev); + + return regmap_update_bits(max31329->regmap, MAX31329_INT_EN_REG, + MAX31329_INT_EN_A1IE, + enable ? MAX31329_INT_EN_A1IE : 0); +} + +static int max31329_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) +{ + struct max31329_data *max31329 = dev_get_drvdata(dev); + struct rtc_time *const tm = &alarm->time; + unsigned int aie_en, aie_flag; + int ret; + u8 regs[6]; + + ret = max31329_get_osc_status(dev); + if (ret) + return ret; + + ret = regmap_bulk_read(max31329->regmap, MAX31329_ALM1_SEC_REG, regs, + MAX31329_ALM1_SEC_LEN); + if (ret) + return ret; + + ret = regmap_read(max31329->regmap, MAX31329_INT_EN_REG, &aie_en); + if (ret) + return ret; + + ret = regmap_read(max31329->regmap, MAX31329_STATUS_REG, &aie_flag); + if (ret) + return ret; + + tm->tm_sec = bcd2bin(regs[REG_TO_OFFSET(MAX31329_SECONDS_REG)] & 0x7f); + tm->tm_min = bcd2bin(regs[REG_TO_OFFSET(MAX31329_MINUTES_REG)] & 0x7f); + tm->tm_hour = bcd2bin(regs[REG_TO_OFFSET(MAX31329_HOURS_REG)] & 0x3f); + tm->tm_mday = bcd2bin(regs[REG_TO_OFFSET(MAX31329_DATE_REG) - 1] & 0x3f); + tm->tm_mon = bcd2bin(regs[REG_TO_OFFSET(MAX31329_MONTH_REG) - 1] & + 0x1f) - 1; + tm->tm_year = bcd2bin(regs[REG_TO_OFFSET(MAX31329_YEAR_REG) - 1]) + 200; + + alarm->enabled = FIELD_GET(MAX31329_INT_EN_A1IE, aie_en); + alarm->pending = FIELD_GET(MAX31329_STATUS_A1F, aie_flag) && + alarm->enabled; + + return 0; +} + +static int max31329_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) +{ + struct max31329_data *max31329 = dev_get_drvdata(dev); + const struct rtc_time *tm = &alrm->time; + u8 regs[6], year; + int ret; + + ret = max31329_get_osc_status(dev); + if (ret) + return ret; + + regs[REG_TO_OFFSET(MAX31329_SECONDS_REG)] = bin2bcd(tm->tm_sec) & 0x7F; + regs[REG_TO_OFFSET(MAX31329_MINUTES_REG)] = bin2bcd(tm->tm_min) & 0x7f; + regs[REG_TO_OFFSET(MAX31329_HOURS_REG)] = bin2bcd(tm->tm_hour) & 0x3f; + regs[REG_TO_OFFSET(MAX31329_DATE_REG) - 1] = bin2bcd(tm->tm_mday) & 0x3f; + regs[REG_TO_OFFSET(MAX31329_MONTH_REG) - 1] = bin2bcd(tm->tm_mon + 1) & 0x1f; + + if (tm->tm_year >= 200) + year = bin2bcd(tm->tm_year - 200); + else + year = bin2bcd(tm->tm_year - 100); + regs[REG_TO_OFFSET(MAX31329_YEAR_REG) - 1] = year; + + ret = regmap_bulk_write(max31329->regmap, MAX31329_ALM1_SEC_REG, regs, + MAX31329_ALM1_SEC_LEN); + if (ret) + return ret; + + return max31329_alarm_irq_enable(dev, alrm->enabled); +} + +static int max31329_read_time(struct device *dev, struct rtc_time *tm) +{ + struct max31329_data *max31329 = dev_get_drvdata(dev); + u8 data[7], century = 0; + int ret; + + ret = max31329_get_osc_status(dev); + if (ret) + return ret; + + ret = regmap_bulk_read(max31329->regmap, MAX31329_SECONDS_REG, data, + sizeof(data)); + if (ret) + return ret; + + tm->tm_sec = bcd2bin(data[REG_TO_OFFSET(MAX31329_SECONDS_REG)] & 0x7f); + tm->tm_min = bcd2bin(data[REG_TO_OFFSET(MAX31329_MINUTES_REG)] & 0x7f); + tm->tm_hour = bcd2bin(data[REG_TO_OFFSET(MAX31329_HOURS_REG)] & 0x3f); + /* Day of the week in linux range is 0~6 while 1~7 in RTC chip */ + tm->tm_wday = bcd2bin(data[REG_TO_OFFSET(MAX31329_DAY_REG)] & 0x07) - 1; + tm->tm_mday = bcd2bin(data[REG_TO_OFFSET(MAX31329_DATE_REG)] & 0x3f); + /* linux tm_mon range:0~11, while month range is 1~12 in RTC chip */ + tm->tm_mon = bcd2bin(data[REG_TO_OFFSET(MAX31329_MONTH_REG)] & 0x1f) - 1; + + century = data[REG_TO_OFFSET(MAX31329_MONTH_REG)] & MAX31329_MONTH_CENTURY; + tm->tm_year = bcd2bin(data[REG_TO_OFFSET(MAX31329_YEAR_REG)]) + + (century ? 200 : 100); + + return 0; +} + +static int max31329_set_time(struct device *dev, struct rtc_time *tm) +{ + struct max31329_data *max31329 = dev_get_drvdata(dev); + u8 regs[7]; + int ret; + + ret = max31329_get_osc_status(dev); + if (ret) + return ret; + + regs[REG_TO_OFFSET(MAX31329_SECONDS_REG)] = bin2bcd(tm->tm_sec); + regs[REG_TO_OFFSET(MAX31329_MINUTES_REG)] = bin2bcd(tm->tm_min); + regs[REG_TO_OFFSET(MAX31329_HOURS_REG)] = bin2bcd(tm->tm_hour); + regs[REG_TO_OFFSET(MAX31329_DAY_REG)] = bin2bcd(tm->tm_wday + 1); + regs[REG_TO_OFFSET(MAX31329_DATE_REG)] = bin2bcd(tm->tm_mday); + regs[REG_TO_OFFSET(MAX31329_MONTH_REG)] = bin2bcd(tm->tm_mon + 1); + + if (tm->tm_year >= 200) + regs[REG_TO_OFFSET(MAX31329_MONTH_REG)] |= MAX31329_MONTH_CENTURY; + regs[REG_TO_OFFSET(MAX31329_YEAR_REG)] = bin2bcd(tm->tm_year % 100); + + return regmap_bulk_write(max31329->regmap, MAX31329_SECONDS_REG, regs, + MAX31329_WATCH_SEC_LEN); +} + +static const struct rtc_class_ops max31329_rtc_ops = { + .read_time = max31329_read_time, + .set_time = max31329_set_time, + .read_alarm = max31329_read_alarm, + .set_alarm = max31329_set_alarm, + .alarm_irq_enable = max31329_alarm_irq_enable, +}; + +static irqreturn_t max31329_irq_handler(int irq, void *dev_id) +{ + struct device *dev = dev_id; + struct max31329_data *max31329 = dev_get_drvdata(dev); + unsigned int flags, controls; + unsigned long events = 0; + int ret; + + ret = regmap_read(max31329->regmap, MAX31329_INT_EN_REG, &controls); + if (ret) { + dev_warn(dev, "Read IRQ control register error %d\n", ret); + return IRQ_NONE; + } + + ret = regmap_read(max31329->regmap, MAX31329_STATUS_REG, &flags); + if (ret) { + dev_warn(dev, "Read IRQ flags register error %d\n", ret); + return IRQ_NONE; + } + + if (flags & MAX31329_STATUS_A1F) { + flags &= ~MAX31329_STATUS_A1F; + controls &= ~MAX31329_INT_EN_A1IE; + events = RTC_AF | RTC_IRQF; + } + + if (events) { + rtc_update_irq(max31329->rtc, 1, events); + regmap_write(max31329->regmap, MAX31329_STATUS_REG, flags); + regmap_write(max31329->regmap, MAX31329_INT_EN_REG, controls); + return IRQ_HANDLED; + } + + return IRQ_NONE; +} + +static void max31329_trickle_config(struct device *dev) +{ + struct max31329_data *max31329 = dev_get_drvdata(dev); + u8 trickle_reg; + int ret, i; + u32 ohms; + + /* Configure the trickle charger. */ + ret = device_property_read_u32(dev, "trickle-resistor-ohms", &ohms); + if (ret) + return; + + trickle_reg = MAX31329_TRICKLE_EN; + for (i = 1; i <= ARRAY_SIZE(max31329_trickle_ohms); i++) { + if (max31329_trickle_ohms[i - 1] == ohms) { + trickle_reg |= i; + regmap_write(max31329->regmap, MAX31329_TRICKLE_REG, + trickle_reg); + } + } +} + +static int max31329_nvram_write(void *priv, unsigned int offset, void *val, + size_t bytes) +{ + struct regmap *max31329_regmap = (struct regmap *)priv; + + return regmap_bulk_write(max31329_regmap, + MAX31329_RAM0_START_REG + offset, + val, bytes); +} + +static int max31329_nvram_read(void *priv, unsigned int offset, void *val, + size_t bytes) +{ + struct regmap *max31329_regmap = (struct regmap *)priv; + + return regmap_bulk_read(max31329_regmap, + MAX31329_RAM0_START_REG + offset, + val, bytes); +} + +#ifdef CONFIG_COMMON_CLK +#define clkout_hw_to_max31329(hw) container_of(hw, struct max31329_data, clkout_hw) + +static int clkout_rates[] = { + 1, + 4096, + 8192, + 32768 +}; + +static unsigned long max31329_clkout_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct max31329_data *max31329 = clkout_hw_to_max31329(hw); + int clkout, ret; + + ret = regmap_read(max31329->regmap, MAX31329_RTC_CONFIG2_REG, &clkout); + if (ret) + return 0; + + return clkout_rates[FIELD_GET(MAX31329_RTC_CFG2_CLKOHZ_MSK, clkout)]; +} + +static long max31329_clkout_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *prate) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(clkout_rates); i++) + if (clkout_rates[i] >= rate) + return clkout_rates[i]; + + return 0; +} + +static int max31329_clkout_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct max31329_data *max31329 = clkout_hw_to_max31329(hw); + int i; + + for (i = 0; i < ARRAY_SIZE(clkout_rates); i++) + if (rate == clkout_rates[i]) + return regmap_update_bits(max31329->regmap, + MAX31329_RTC_CONFIG2_REG, + MAX31329_RTC_CFG2_CLKOHZ_MSK, + FIELD_PREP(MAX31329_RTC_CFG2_CLKOHZ_MSK, + i)); + return -EINVAL; +} + +static int max31329_clkout_prepare(struct clk_hw *hw) +{ + struct max31329_data *max31329 = clkout_hw_to_max31329(hw); + + return regmap_update_bits(max31329->regmap, MAX31329_RTC_CONFIG2_REG, + MAX31329_RTC_CONFIG2_ENCLKO, + MAX31329_RTC_CONFIG2_ENCLKO); +} + +static void max31329_clkout_unprepare(struct clk_hw *hw) +{ + struct max31329_data *max31329 = clkout_hw_to_max31329(hw); + + regmap_update_bits(max31329->regmap, MAX31329_RTC_CONFIG2_REG, + MAX31329_RTC_CONFIG2_ENCLKO, + FIELD_PREP(MAX31329_RTC_CONFIG2_ENCLKO, 0)); +} + +static int max31329_clkout_is_prepared(struct clk_hw *hw) +{ + struct max31329_data *max31329 = clkout_hw_to_max31329(hw); + int clkout, ret; + + ret = regmap_read(max31329->regmap, MAX31329_RTC_CONFIG2_REG, &clkout); + if (ret) + return ret; + + return !!(clkout & MAX31329_RTC_CONFIG2_ENCLKO); +} + +static const struct clk_ops max31329_clkout_ops = { + .prepare = max31329_clkout_prepare, + .unprepare = max31329_clkout_unprepare, + .is_prepared = max31329_clkout_is_prepared, + .recalc_rate = max31329_clkout_recalc_rate, + .round_rate = max31329_clkout_round_rate, + .set_rate = max31329_clkout_set_rate, +}; + +static int max31329_clkout_register_clk(struct max31329_data *max31329, + struct i2c_client *client) +{ + struct device_node *node = client->dev.of_node; + struct clk_init_data init; + struct clk *clk; + + init.name = "max31329-clkout"; + init.ops = &max31329_clkout_ops; + init.flags = 0; + init.parent_names = NULL; + init.num_parents = 0; + max31329->clkout_hw.init = &init; + + /* optional override of the clockname */ + of_property_read_string(node, "clock-output-names", &init.name); + + clk = devm_clk_register(&client->dev, &max31329->clkout_hw); + if (!IS_ERR(clk)) + of_clk_add_provider(node, of_clk_src_simple_get, clk); + + return PTR_ERR(clk); +} +#endif + +static int max31329_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct max31329_data *max31329; + int ret; + struct nvmem_config nvmem_cfg = { + .name = "max31329_nvram", + .word_size = 1, + .stride = 1, + .size = 64, + .type = NVMEM_TYPE_BATTERY_BACKED, + .reg_read = max31329_nvram_read, + .reg_write = max31329_nvram_write, + }; + + max31329 = devm_kzalloc(&client->dev, sizeof(*max31329), GFP_KERNEL); + if (!max31329) + return -ENOMEM; + + max31329->regmap = devm_regmap_init_i2c(client, &config); + if (IS_ERR(max31329->regmap)) { + dev_err(&client->dev, "regmap init failed\n"); + return PTR_ERR(max31329->regmap); + } + + dev_set_drvdata(&client->dev, max31329); + + max31329->rtc = devm_rtc_allocate_device(&client->dev); + if (IS_ERR(max31329->rtc)) + return PTR_ERR(max31329->rtc); + + max31329->rtc->ops = &max31329_rtc_ops; + max31329->irq = client->irq; + max31329->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000; + max31329->rtc->range_max = RTC_TIMESTAMP_END_2199; + + if (max31329->irq) { + ret = devm_request_threaded_irq(&client->dev, max31329->irq, + NULL, max31329_irq_handler, + IRQF_TRIGGER_LOW | IRQF_ONESHOT, + "max31329", &client->dev); + if (ret) { + dev_err(&client->dev, "unable to request IRQ\n"); + return ret; + } + + ret = regmap_write(max31329->regmap, MAX31329_RTC_CONFIG2_REG, + MAX31329_RTC_CONFIG2_ENCLKO); + if (ret) { + dev_err(&client->dev, "unable to configure INT pin"); + return ret; + } + + if (device_property_read_bool(&client->dev, "wakeup-source")) + device_init_wakeup(&client->dev, true); + } else { + clear_bit(RTC_FEATURE_ALARM, max31329->rtc->features); + clear_bit(RTC_FEATURE_UPDATE_INTERRUPT, max31329->rtc->features); + } + + ret = devm_rtc_register_device(max31329->rtc); + if (ret) + return ret; + + max31329_trickle_config(&client->dev); + + nvmem_cfg.priv = max31329->regmap; + devm_rtc_nvmem_register(max31329->rtc, &nvmem_cfg); + +#ifdef CONFIG_COMMON_CLK + max31329_clkout_register_clk(max31329, client); +#endif + + return 0; +} + +static const __maybe_unused struct of_device_id max31329_of_match[] = { + { .compatible = "maxim,max31329", }, + { } +}; +MODULE_DEVICE_TABLE(of, max31329_of_match); + +static struct i2c_driver max31329_driver = { + .driver = { + .name = "rtc-max31329", + .of_match_table = of_match_ptr(max31329_of_match), + }, + .probe = max31329_probe, +}; +module_i2c_driver(max31329_driver); + +MODULE_AUTHOR("Jagath Jog J "); +MODULE_DESCRIPTION("Maxim MAX31329 RTC driver"); +MODULE_LICENSE("GPL");