From patchwork Wed Jan 8 10:47:46 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marco Felsch X-Patchwork-Id: 207451 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D4D6DC33C9B for ; Wed, 8 Jan 2020 10:48:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A35E02072A for ; Wed, 8 Jan 2020 10:48:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727478AbgAHKsL (ORCPT ); Wed, 8 Jan 2020 05:48:11 -0500 Received: from metis.ext.pengutronix.de ([85.220.165.71]:50713 "EHLO metis.ext.pengutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727930AbgAHKsK (ORCPT ); Wed, 8 Jan 2020 05:48:10 -0500 Received: from dude02.hi.pengutronix.de ([2001:67c:670:100:1d::28] helo=dude02.lab.pengutronix.de) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1ip8se-0000ec-56; Wed, 08 Jan 2020 11:48:04 +0100 Received: from mfe by dude02.lab.pengutronix.de with local (Exim 4.92) (envelope-from ) id 1ip8sd-00015C-Jd; Wed, 08 Jan 2020 11:48:03 +0100 From: Marco Felsch To: support.opensource@diasemi.com, lee.jones@linaro.org, robh+dt@kernel.org, linus.walleij@linaro.org, Adam.Thomson.Opensource@diasemi.com Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, kernel@pengutronix.de, linux-gpio@vger.kernel.org Subject: [PATCH v4 3/3] pinctrl: da9062: add driver support Date: Wed, 8 Jan 2020 11:47:46 +0100 Message-Id: <20200108104746.1765-4-m.felsch@pengutronix.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200108104746.1765-1-m.felsch@pengutronix.de> References: <20200108104746.1765-1-m.felsch@pengutronix.de> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 2001:67c:670:100:1d::28 X-SA-Exim-Mail-From: mfe@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-gpio@vger.kernel.org Sender: linux-gpio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org The DA9062 is a mfd pmic device which supports 5 GPIOs. The GPIOs can be used as input, output or have a special use-case. The patch adds the support for the normal input/output use-case. Signed-off-by: Marco Felsch --- Changelog: v4: - add missing PIN_CONFIG_BIAS_DISABLE v3: - add comment for gpio private include - add missing bits.h include - add pin_config state container and set initial pin state to push-pull - make use of GPIO_LINE_DIRECTION_{IN,OUT} - update MAINTAINERS entry -> gpio-da90??.c already covered but not pinctrl-da90??.c v2: - fix minor style issue - move from drivers/gpio to drivers/pinctrl - Fix spelling issue - rename local gpio_dir to gpio_mode - Add datasheet reference and TODO notes - move gpio to mfd-root node to avoid hierarchical interrupt chips - Add gpio-controller property check - remove of_device_id since we drop the gpio of-subnode - Drop da9062_gpio_get_hwgpio --- MAINTAINERS | 1 + drivers/pinctrl/Kconfig | 12 ++ drivers/pinctrl/Makefile | 1 + drivers/pinctrl/pinctrl-da9062.c | 300 +++++++++++++++++++++++++++++++ 4 files changed, 314 insertions(+) create mode 100644 drivers/pinctrl/pinctrl-da9062.c diff --git a/MAINTAINERS b/MAINTAINERS index bd5847e802de..9692ff05cd14 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -4867,6 +4867,7 @@ F: drivers/leds/leds-da90??.c F: drivers/mfd/da903x.c F: drivers/mfd/da90??-*.c F: drivers/mfd/da91??-*.c +F: drivers/pinctrl/pinctrl-da90??.c F: drivers/power/supply/da9052-battery.c F: drivers/power/supply/da91??-*.c F: drivers/regulator/da903x.c diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig index 3bfbf2ff6e2b..88a3864f32a5 100644 --- a/drivers/pinctrl/Kconfig +++ b/drivers/pinctrl/Kconfig @@ -126,6 +126,18 @@ config PINCTRL_DA850_PUPD Driver for TI DA850/OMAP-L138/AM18XX pinconf. Used to control pullup/pulldown pin groups. +config PINCTRL_DA9062 + tristate "Dialog Semiconductor DA9062 PMIC pinctrl and GPIO Support" + depends on MFD_DA9062 + select GPIOLIB + help + The Dialog DA9062 PMIC provides multiple GPIOs that can be muxed for + different functions. This driver bundles a pinctrl driver to select the + function muxing and a GPIO driver to handle the GPIO when the GPIO + function is selected. + + Say yes to enable pinctrl and GPIO support for the DA9062 PMIC. + config PINCTRL_DIGICOLOR bool depends on OF && (ARCH_DIGICOLOR || COMPILE_TEST) diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile index 879f312bfb75..0b36a1cfca8a 100644 --- a/drivers/pinctrl/Makefile +++ b/drivers/pinctrl/Makefile @@ -16,6 +16,7 @@ obj-$(CONFIG_PINCTRL_AT91PIO4) += pinctrl-at91-pio4.o obj-$(CONFIG_PINCTRL_AMD) += pinctrl-amd.o obj-$(CONFIG_PINCTRL_BM1880) += pinctrl-bm1880.o obj-$(CONFIG_PINCTRL_DA850_PUPD) += pinctrl-da850-pupd.o +obj-$(CONFIG_PINCTRL_DA9062) += pinctrl-da9062.o obj-$(CONFIG_PINCTRL_DIGICOLOR) += pinctrl-digicolor.o obj-$(CONFIG_PINCTRL_FALCON) += pinctrl-falcon.o obj-$(CONFIG_PINCTRL_GEMINI) += pinctrl-gemini.o diff --git a/drivers/pinctrl/pinctrl-da9062.c b/drivers/pinctrl/pinctrl-da9062.c new file mode 100644 index 000000000000..f704ee0b2fd9 --- /dev/null +++ b/drivers/pinctrl/pinctrl-da9062.c @@ -0,0 +1,300 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Dialog DA9062 pinctrl and GPIO driver. + * Based on DA9055 GPIO driver. + * + * TODO: + * - add pinmux and pinctrl support (gpio alternate mode) + * + * Documents: + * [1] https://www.dialog-semiconductor.com/sites/default/files/da9062_datasheet_3v6.pdf + * + * Copyright (C) 2019 Pengutronix, Marco Felsch + */ +#include +#include +#include +#include + +#include + +#include +#include + +/* + * We need this get the gpio_desc from a tuple to decide if + * the gpio is active low without a vendor specific dt-binding. + */ +#include <../gpio/gpiolib.h> + +#define DA9062_TYPE(offset) (4 * (offset % 2)) +#define DA9062_PIN_SHIFT(offset) (4 * (offset % 2)) +#define DA9062_PIN_ALTERNATE 0x00 /* gpio alternate mode */ +#define DA9062_PIN_GPI 0x01 /* gpio in */ +#define DA9062_PIN_GPO_OD 0x02 /* gpio out open-drain */ +#define DA9062_PIN_GPO_PP 0x03 /* gpio out push-pull */ +#define DA9062_GPIO_NUM 5 + +struct da9062_pctl { + struct da9062 *da9062; + struct gpio_chip gc; + unsigned int pin_config[DA9062_GPIO_NUM]; +}; + +static int da9062_pctl_get_pin_mode(struct da9062_pctl *pctl, + unsigned int offset) +{ + struct regmap *regmap = pctl->da9062->regmap; + int ret, val; + + ret = regmap_read(regmap, DA9062AA_GPIO_0_1 + (offset >> 1), &val); + if (ret < 0) + return ret; + + val >>= DA9062_PIN_SHIFT(offset); + val &= DA9062AA_GPIO0_PIN_MASK; + + return val; +} + +static int da9062_pctl_set_pin_mode(struct da9062_pctl *pctl, + unsigned int offset, unsigned int mode_req) +{ + struct regmap *regmap = pctl->da9062->regmap; + unsigned int mode = mode_req; + unsigned int mask; + int ret; + + mode &= DA9062AA_GPIO0_PIN_MASK; + mode <<= DA9062_PIN_SHIFT(offset); + mask = DA9062AA_GPIO0_PIN_MASK << DA9062_PIN_SHIFT(offset); + + ret = regmap_update_bits(regmap, DA9062AA_GPIO_0_1 + (offset >> 1), + mask, mode); + if (!ret) + pctl->pin_config[offset] = mode_req; + + return ret; +} + +static int da9062_gpio_get(struct gpio_chip *gc, unsigned int offset) +{ + struct da9062_pctl *pctl = gpiochip_get_data(gc); + struct regmap *regmap = pctl->da9062->regmap; + int gpio_mode, val; + int ret; + + gpio_mode = da9062_pctl_get_pin_mode(pctl, offset); + if (gpio_mode < 0) + return gpio_mode; + + switch (gpio_mode) { + case DA9062_PIN_ALTERNATE: + return -ENOTSUPP; + case DA9062_PIN_GPI: + ret = regmap_read(regmap, DA9062AA_STATUS_B, &val); + if (ret < 0) + return ret; + break; + case DA9062_PIN_GPO_OD: + case DA9062_PIN_GPO_PP: + ret = regmap_read(regmap, DA9062AA_GPIO_MODE0_4, &val); + if (ret < 0) + return ret; + } + + return !!(val & BIT(offset)); +} + +static void da9062_gpio_set(struct gpio_chip *gc, unsigned int offset, + int value) +{ + struct da9062_pctl *pctl = gpiochip_get_data(gc); + struct regmap *regmap = pctl->da9062->regmap; + + regmap_update_bits(regmap, DA9062AA_GPIO_MODE0_4, BIT(offset), + value << offset); +} + +static int da9062_gpio_get_direction(struct gpio_chip *gc, unsigned int offset) +{ + struct da9062_pctl *pctl = gpiochip_get_data(gc); + int gpio_mode; + + gpio_mode = da9062_pctl_get_pin_mode(pctl, offset); + if (gpio_mode < 0) + return gpio_mode; + + switch (gpio_mode) { + case DA9062_PIN_ALTERNATE: + return -ENOTSUPP; + case DA9062_PIN_GPI: + return GPIO_LINE_DIRECTION_IN; + case DA9062_PIN_GPO_OD: + case DA9062_PIN_GPO_PP: + return GPIO_LINE_DIRECTION_OUT; + } + + return -EINVAL; +} + +static int da9062_gpio_direction_input(struct gpio_chip *gc, + unsigned int offset) +{ + struct da9062_pctl *pctl = gpiochip_get_data(gc); + struct regmap *regmap = pctl->da9062->regmap; + struct gpio_desc *desc = gpiochip_get_desc(gc, offset); + unsigned int gpi_type; + int ret; + + ret = da9062_pctl_set_pin_mode(pctl, offset, DA9062_PIN_GPI); + if (ret) + return ret; + + /* + * If the gpio is active low we should set it in hw too. No worries + * about gpio_get() because we read and return the gpio-level. So the + * gpiolib active_low handling is still correct. + * + * 0 - active low, 1 - active high + */ + gpi_type = !gpiod_is_active_low(desc); + + return regmap_update_bits(regmap, DA9062AA_GPIO_0_1 + (offset >> 1), + DA9062AA_GPIO0_TYPE_MASK << DA9062_TYPE(offset), + gpi_type << DA9062_TYPE(offset)); +} + +static int da9062_gpio_direction_output(struct gpio_chip *gc, + unsigned int offset, int value) +{ + struct da9062_pctl *pctl = gpiochip_get_data(gc); + unsigned int pin_config = pctl->pin_config[offset]; + int ret; + + ret = da9062_pctl_set_pin_mode(pctl, offset, pin_config); + if (ret) + return ret; + + da9062_gpio_set(gc, offset, value); + + return 0; +} + +static int da9062_gpio_set_config(struct gpio_chip *gc, unsigned int offset, + unsigned long config) +{ + struct da9062_pctl *pctl = gpiochip_get_data(gc); + struct regmap *regmap = pctl->da9062->regmap; + int gpio_mode; + + /* + * We need to meet the following restrictions [1, Figure 18]: + * - PIN_CONFIG_BIAS_PULL_DOWN -> only allowed if the pin is used as + * gpio input + * - PIN_CONFIG_BIAS_PULL_UP -> only allowed if the pin is used as + * gpio output open-drain. + */ + + switch (pinconf_to_config_param(config)) { + case PIN_CONFIG_BIAS_DISABLE: + return regmap_update_bits(regmap, DA9062AA_CONFIG_K, + BIT(offset), 0); + case PIN_CONFIG_BIAS_PULL_DOWN: + gpio_mode = da9062_pctl_get_pin_mode(pctl, offset); + if (gpio_mode < 0) + return -EINVAL; + else if (gpio_mode != DA9062_PIN_GPI) + return -ENOTSUPP; + return regmap_update_bits(regmap, DA9062AA_CONFIG_K, + BIT(offset), BIT(offset)); + case PIN_CONFIG_BIAS_PULL_UP: + gpio_mode = da9062_pctl_get_pin_mode(pctl, offset); + if (gpio_mode < 0) + return -EINVAL; + else if (gpio_mode != DA9062_PIN_GPO_OD) + return -ENOTSUPP; + return regmap_update_bits(regmap, DA9062AA_CONFIG_K, + BIT(offset), BIT(offset)); + case PIN_CONFIG_DRIVE_OPEN_DRAIN: + return da9062_pctl_set_pin_mode(pctl, offset, + DA9062_PIN_GPO_OD); + case PIN_CONFIG_DRIVE_PUSH_PULL: + return da9062_pctl_set_pin_mode(pctl, offset, + DA9062_PIN_GPO_PP); + default: + return -ENOTSUPP; + } +} + +static int da9062_gpio_to_irq(struct gpio_chip *gc, unsigned int offset) +{ + struct da9062_pctl *pctl = gpiochip_get_data(gc); + struct da9062 *da9062 = pctl->da9062; + + return regmap_irq_get_virq(da9062->regmap_irq, + DA9062_IRQ_GPI0 + offset); +} + +static const struct gpio_chip reference_gc = { + .owner = THIS_MODULE, + .get = da9062_gpio_get, + .set = da9062_gpio_set, + .get_direction = da9062_gpio_get_direction, + .direction_input = da9062_gpio_direction_input, + .direction_output = da9062_gpio_direction_output, + .set_config = da9062_gpio_set_config, + .to_irq = da9062_gpio_to_irq, + .can_sleep = true, + .ngpio = DA9062_GPIO_NUM, + .base = -1, +}; + +static int da9062_pctl_probe(struct platform_device *pdev) +{ + struct device *parent = pdev->dev.parent; + struct da9062_pctl *pctl; + int i; + + pctl = devm_kzalloc(&pdev->dev, sizeof(*pctl), GFP_KERNEL); + if (!pctl) + return -ENOMEM; + + pctl->da9062 = dev_get_drvdata(parent); + if (!pctl->da9062) + return -EINVAL; + + if (!device_property_present(parent, "gpio-controller")) + return 0; + + for (i = 0; i < ARRAY_SIZE(pctl->pin_config); i++) + pctl->pin_config[i] = DA9062_PIN_GPO_PP; + + /* + * Currently the driver handles only the GPIO support. The + * pinctrl/pinmux support can be added later if needed. + */ + pctl->gc = reference_gc; + pctl->gc.label = dev_name(&pdev->dev); + pctl->gc.parent = &pdev->dev; +#ifdef CONFIG_OF_GPIO + pctl->gc.of_node = parent->of_node; +#endif + + platform_set_drvdata(pdev, pctl); + + return devm_gpiochip_add_data(&pdev->dev, &pctl->gc, pctl); +} + +static struct platform_driver da9062_pctl_driver = { + .probe = da9062_pctl_probe, + .driver = { + .name = "da9062-gpio", + }, +}; +module_platform_driver(da9062_pctl_driver); + +MODULE_AUTHOR("Marco Felsch "); +MODULE_DESCRIPTION("DA9062 PMIC pinctrl and GPIO Driver"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:da9062-gpio");