From patchwork Fri Nov 18 09:22:17 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matt Ranostay X-Patchwork-Id: 626470 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 43287C4167B for ; Fri, 18 Nov 2022 09:23:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241427AbiKRJXH (ORCPT ); Fri, 18 Nov 2022 04:23:07 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40650 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241907AbiKRJXD (ORCPT ); Fri, 18 Nov 2022 04:23:03 -0500 Received: from fllv0016.ext.ti.com (fllv0016.ext.ti.com [198.47.19.142]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E8B6513FB4; Fri, 18 Nov 2022 01:23:01 -0800 (PST) Received: from lelv0265.itg.ti.com ([10.180.67.224]) by fllv0016.ext.ti.com (8.15.2/8.15.2) with ESMTP id 2AI9McU6088988; Fri, 18 Nov 2022 03:22:38 -0600 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1668763358; bh=tXs6R0mvSUCO8x2+JuLayHsb/o4hcOq8dxYox3qUjUI=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=kbruheuCfW8eXPWeEbbI6zlBZdE8Ej2wXtyP1XLAi7x4k87G0JQOj52SS66L0hVEc S09jztvq4nSvm9UVGlYNSYf+MOB4btQoxAZJo4AMPPTP8kYFrnZ+cCyOKkVt6REiyZ xafENdEmAYzQMx6g58Yz6YDHo0JPVfvVfe9MUI4A= Received: from DLEE115.ent.ti.com (dlee115.ent.ti.com [157.170.170.26]) by lelv0265.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 2AI9Mcod031115 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Fri, 18 Nov 2022 03:22:38 -0600 Received: from DLEE112.ent.ti.com (157.170.170.23) by DLEE115.ent.ti.com (157.170.170.26) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.16; Fri, 18 Nov 2022 03:22:37 -0600 Received: from lelv0326.itg.ti.com (10.180.67.84) by DLEE112.ent.ti.com (157.170.170.23) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.16 via Frontend Transport; Fri, 18 Nov 2022 03:22:37 -0600 Received: from localhost (ileaxei01-snat2.itg.ti.com [10.180.69.6]) by lelv0326.itg.ti.com (8.15.2/8.15.2) with ESMTP id 2AI9MYas027958; Fri, 18 Nov 2022 03:22:36 -0600 From: Matt Ranostay To: , , , , , , CC: , , , , Keerthy , Matt Ranostay Subject: [PATCH v4 3/4] rtc: rtc-tps6594x: Add support for TPS6594X PMIC RTC Date: Fri, 18 Nov 2022 01:22:17 -0800 Message-ID: <20221118092218.480147-4-mranostay@ti.com> X-Mailer: git-send-email 2.38.GIT In-Reply-To: <20221118092218.480147-1-mranostay@ti.com> References: <20221118092218.480147-1-mranostay@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org From: Keerthy Add support for TPS6594X PMIC RTC. However, currently only get/set of time + date functionality is supported. Signed-off-by: Keerthy Signed-off-by: Matt Ranostay --- drivers/rtc/Kconfig | 10 +++ drivers/rtc/Makefile | 1 + drivers/rtc/rtc-tps6594x.c | 155 +++++++++++++++++++++++++++++++++++++ 3 files changed, 166 insertions(+) create mode 100644 drivers/rtc/rtc-tps6594x.c diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index ab9a1f814119..50e0de4d6eb3 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -588,6 +588,16 @@ config RTC_DRV_TPS65910 This driver can also be built as a module. If so, the module will be called rtc-tps65910. +config RTC_DRV_TPS6594X + tristate "TI TPS6594X RTC driver" + depends on MFD_TPS6594X || COMPILE_TEST + help + If you say yes here you get support for the RTC of TI TPS6594X series PMIC + chips. + + This driver can also be built as a module. If so, the module + will be called rtc-tps6594x. + config RTC_DRV_RC5T583 tristate "RICOH 5T583 RTC driver" depends on MFD_RC5T583 diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index d3c042dcbc73..5e3a3b06fc20 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -175,6 +175,7 @@ obj-$(CONFIG_RTC_DRV_TEST) += rtc-test.o obj-$(CONFIG_RTC_DRV_TI_K3) += rtc-ti-k3.o obj-$(CONFIG_RTC_DRV_TPS6586X) += rtc-tps6586x.o obj-$(CONFIG_RTC_DRV_TPS65910) += rtc-tps65910.o +obj-$(CONFIG_RTC_DRV_TPS6594X) += rtc-tps6594x.o obj-$(CONFIG_RTC_DRV_TWL4030) += rtc-twl.o obj-$(CONFIG_RTC_DRV_V3020) += rtc-v3020.o obj-$(CONFIG_RTC_DRV_VT8500) += rtc-vt8500.o diff --git a/drivers/rtc/rtc-tps6594x.c b/drivers/rtc/rtc-tps6594x.c new file mode 100644 index 000000000000..20fe076112e6 --- /dev/null +++ b/drivers/rtc/rtc-tps6594x.c @@ -0,0 +1,155 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * rtc-tps6594x.c -- TPS6594x Real Time Clock driver. + * + * Copyright (C) 2022 Texas Instruments Incorporated - https://www.ti.com + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct tps6594x_rtc { + struct rtc_device *rtc; + struct device *dev; +}; + +#define TPS6594X_RTC_POLL 20000 +#define TPS6594X_RTC_TIMEOUT 100000 + +#define TPS6594X_NUM_TIME_REGS (TPS6594X_RTC_YEARS - TPS6594X_RTC_SECONDS + 1) + +static int tps6594x_rtc_read_time(struct device *dev, struct rtc_time *tm) +{ + unsigned char rtc_data[TPS6594X_NUM_TIME_REGS]; + struct tps6594x *tps6594x = dev_get_drvdata(dev->parent); + int ret; + + /* Reset TPS6594X_RTC_CTRL_REG_GET_TIME bit to zero, required for latch */ + ret = regmap_update_bits(tps6594x->regmap, TPS6594X_RTC_CTRL_1, + TPS6594X_RTC_CTRL_REG_GET_TIME, 0); + if (ret < 0) + return ret; + + /* Copy RTC counting registers to static registers or latches */ + ret = regmap_update_bits(tps6594x->regmap, TPS6594X_RTC_CTRL_1, + TPS6594X_RTC_CTRL_REG_GET_TIME, TPS6594X_RTC_CTRL_REG_GET_TIME); + if (ret < 0) + return ret; + + ret = regmap_bulk_read(tps6594x->regmap, TPS6594X_RTC_SECONDS, + rtc_data, TPS6594X_NUM_TIME_REGS); + if (ret < 0) + return ret; + + tm->tm_sec = bcd2bin(rtc_data[0]); + tm->tm_min = bcd2bin(rtc_data[1]); + tm->tm_hour = bcd2bin(rtc_data[2]); + tm->tm_mday = bcd2bin(rtc_data[3]); + tm->tm_mon = bcd2bin(rtc_data[4]) - 1; + tm->tm_year = bcd2bin(rtc_data[5]) + 100; + + return ret; +} + +static int tps6594x_rtc_set_time(struct device *dev, struct rtc_time *tm) +{ + unsigned char rtc_data[TPS6594X_NUM_TIME_REGS]; + struct tps6594x *tps6594x = dev_get_drvdata(dev->parent); + unsigned int val; + int ret; + + rtc_data[0] = bin2bcd(tm->tm_sec); + rtc_data[1] = bin2bcd(tm->tm_min); + rtc_data[2] = bin2bcd(tm->tm_hour); + rtc_data[3] = bin2bcd(tm->tm_mday); + rtc_data[4] = bin2bcd(tm->tm_mon + 1); + rtc_data[5] = bin2bcd(tm->tm_year - 100); + + /* Stop RTC while updating the RTC time registers */ + ret = regmap_update_bits(tps6594x->regmap, TPS6594X_RTC_CTRL_1, + TPS6594X_RTC_CTRL_REG_STOP_RTC, 0); + if (ret < 0) { + dev_err(dev, "RTC stop failed, err = %d\n", ret); + return ret; + } + + /* Waiting till RTC isn't running */ + ret = regmap_read_poll_timeout(tps6594x->regmap, TPS6594X_RTC_STATUS, + val, !(val & TPS6594X_RTC_STATUS_RUN), + TPS6594X_RTC_POLL, TPS6594X_RTC_TIMEOUT); + if (ret) { + dev_err(dev, "RTC_STATUS is still RUNNING\n"); + return ret; + } + + ret = regmap_bulk_write(tps6594x->regmap, TPS6594X_RTC_SECONDS, + rtc_data, TPS6594X_NUM_TIME_REGS); + if (ret < 0) { + dev_err(dev, "RTC_SECONDS reg write failed, err = %d\n", ret); + return ret; + } + + /* Start back RTC */ + ret = regmap_update_bits(tps6594x->regmap, TPS6594X_RTC_CTRL_1, + TPS6594X_RTC_CTRL_REG_STOP_RTC, + TPS6594X_RTC_CTRL_REG_STOP_RTC); + if (ret < 0) + dev_err(dev, "RTC start failed, err = %d\n", ret); + + return ret; +} + +static const struct rtc_class_ops tps6594x_rtc_ops = { + .read_time = tps6594x_rtc_read_time, + .set_time = tps6594x_rtc_set_time, +}; + +static int tps6594x_rtc_probe(struct platform_device *pdev) +{ + struct tps6594x_rtc *tps6594x_rtc; + + tps6594x_rtc = devm_kzalloc(&pdev->dev, sizeof(*tps6594x_rtc), GFP_KERNEL); + if (!tps6594x_rtc) + return -ENOMEM; + + tps6594x_rtc->dev = &pdev->dev; + platform_set_drvdata(pdev, tps6594x_rtc); + + tps6594x_rtc->rtc = devm_rtc_allocate_device(&pdev->dev); + if (IS_ERR(tps6594x_rtc->rtc)) + return PTR_ERR(tps6594x_rtc->rtc); + + tps6594x_rtc->rtc->ops = &tps6594x_rtc_ops; + + return devm_rtc_register_device(tps6594x_rtc->rtc); +} + +static const struct of_device_id of_tps6594x_rtc_match[] = { + { .compatible = "ti,tps6594-rtc", }, + {}, +}; +MODULE_DEVICE_TABLE(of, of_tps6594x_rtc_match); + +static struct platform_driver tps6594x_rtc_driver = { + .probe = tps6594x_rtc_probe, + .driver = { + .name = "tps6594-rtc", + .of_match_table = of_tps6594x_rtc_match, + }, +}; + +module_platform_driver(tps6594x_rtc_driver); + +MODULE_ALIAS("platform:tps6594-rtc"); +MODULE_DESCRIPTION("TI TPS6594x series RTC driver"); +MODULE_AUTHOR("Keerthy J "); +MODULE_LICENSE("GPL");