From patchwork Mon Apr 26 07:18:08 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: cy_huang X-Patchwork-Id: 427603 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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 59010C43461 for ; Mon, 26 Apr 2021 07:18:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3346F60233 for ; Mon, 26 Apr 2021 07:18:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232078AbhDZHTE (ORCPT ); Mon, 26 Apr 2021 03:19:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35104 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231968AbhDZHTD (ORCPT ); Mon, 26 Apr 2021 03:19:03 -0400 Received: from mail-pg1-x52f.google.com (mail-pg1-x52f.google.com [IPv6:2607:f8b0:4864:20::52f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 626FBC061574; Mon, 26 Apr 2021 00:18:21 -0700 (PDT) Received: by mail-pg1-x52f.google.com with SMTP id b17so2459729pgh.7; Mon, 26 Apr 2021 00:18:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id; bh=ycQkq93FBRkKrvG1bmFIyGlO3vkeoQVKHmxYa97h0Ds=; b=FhgzD21cX7yC7bw6jgXaBRrIBGprb3rBbFl2t/LW/OZRh39pHtyF44RqEbkIonYhND VMJQkBZDnnIfuGDMTd3MfU8EnoqQyN+JiaZJn6YzbVdYgxPHS2GyWUHJsDwcbhJThkUN ER8WJ9JgxLjoVCiPnB5KhZcvy/p2CfRgZRcgQJWkmg9fPc5Tl3b3Wy3YFeizG/0G2wrW YiaSYts1OPfJVP+Cur6Zdbd4OWDUIP0wU7rV3t+m9fzEI4VO72XT1MwFwLtTRDd+mfny C3FtZd1Uay7D0GlQJC6X9tnB1VSIQyN1HxBOAUIBCyx39eal1XelMNQrH0Bv8DUJ0KaQ D7SA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=ycQkq93FBRkKrvG1bmFIyGlO3vkeoQVKHmxYa97h0Ds=; b=QtbiTtupNkY5WMQKEDlFLt6m9Vn2DcFOfy5N4wvHVeje0b38aI3Vpr3n4rVS5EP5vR ktmRfI7mcQSC9cDCC6fI7x+ZZJAAZPg0MDm7Qf8kTzH53NGYaQcIDQUSePddJELlTFcW E0r+ifE8sRtPOs6ulvRu0lu4SdRe6oScN3uQkQ29IL6wFCX6dAcVkp4fNlHGPity0X2r Bgg9GBcZwBoExpQ95GRTm8+KDVU/RO7Q34Hqzv5pagMq4LAu1K1vpaShuXYqFcreH9gb kC/IVeNFTndvlJEE4czdjyOTxjZftW2i5Yej7fMAXMH2GzOgIkXIiTC4kz6InKqXlvMd sNZA== X-Gm-Message-State: AOAM5332Uqoe4F4Trf5ywzEP+/KEe0sajJIJkRP55CS1QHBUFgSkdv+c kLmfQJRM0DiXdnxH6tGK9KrQP9yuPHk= X-Google-Smtp-Source: ABdhPJzfQ0Sn6tgA2t+Wm8Tem8aMCNE+xg4tIUjkJfHmU388d9sMH73aeAs96qk7rUq5zbkkvJCVxw== X-Received: by 2002:a63:da10:: with SMTP id c16mr15586733pgh.221.1619421500847; Mon, 26 Apr 2021 00:18:20 -0700 (PDT) Received: from localhost.localdomain ([2402:7500:492:3af5:75cd:677a:81f7:a9fe]) by smtp.gmail.com with ESMTPSA id u21sm9848952pfm.89.2021.04.26.00.18.16 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 26 Apr 2021 00:18:20 -0700 (PDT) From: cy_huang To: lee.jones@linaro.org, lgirdwood@gmail.com, broonie@kernel.org, daniel.thompson@linaro.org, jingoohan1@gmail.com, b.zolnierkie@samsung.com, pavel@ucw.cz, robh+dt@kernel.org Cc: dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-leds@vger.kernel.org, devicetree@vger.kernel.org, cy_huang@richtek.com Subject: [RESEND PATCH v6 1/4] mfd: rt4831: Adds support for Richtek RT4831 Date: Mon, 26 Apr 2021 15:18:08 +0800 Message-Id: <1619421491-31494-1-git-send-email-u0084500@gmail.com> X-Mailer: git-send-email 2.7.4 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org From: ChiYuan Huang This adds support Richtek RT4831 core. It includes four channel WLED driver and Display Bias Voltage outputs. Signed-off-by: ChiYuan Huang --- Resend this v6 patch series to loop devicetree reviewers. The RT4831 regulator patches are already on main stream, and can be referred to 9351ab8b0cb6 regulator: rt4831: Adds support for Richtek RT4831 DSV regulator 934b05e81862 regulator: rt4831: Adds DT binding document for Richtek RT4831 DSV regulator since v6 - Respin the date from 2020 to 2021. - Rmove the shutdown routine. - Change the macro OF_MFD_CELL to MFD_CELL_OF. since v5 - Rename file name from rt4831-core.c to rt4831.c - Change RICHTEK_VID to RICHTEK_VENDOR_ID. - Change gpio_desc nameing from 'enable' to 'enable_gpio' in probe. - Change variable 'val' to the meaningful name 'chip_id'. - Refine the error log when vendor id is not matched. - Remove of_match_ptr. since v2 - Refine Kconfig descriptions. - Add copyright. - Refine error logs in probe. - Refine comment lines in remove and shutdown. --- drivers/mfd/Kconfig | 10 +++++ drivers/mfd/Makefile | 1 + drivers/mfd/rt4831.c | 115 +++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 126 insertions(+) create mode 100644 drivers/mfd/rt4831.c diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index b74efa4..3f43834 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -1065,6 +1065,16 @@ config MFD_RDC321X southbridge which provides access to GPIOs and Watchdog using the southbridge PCI device configuration space. +config MFD_RT4831 + tristate "Richtek RT4831 four channel WLED and Display Bias Voltage" + depends on I2C + select MFD_CORE + select REGMAP_I2C + help + This enables support for the Richtek RT4831 that includes 4 channel + WLED driving and Display Bias Voltage. It's commonly used to provide + power to the LCD display and LCD backlight. + config MFD_RT5033 tristate "Richtek RT5033 Power Management IC" depends on I2C diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index 834f546..5986914 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -235,6 +235,7 @@ obj-$(CONFIG_MFD_MENF21BMC) += menf21bmc.o obj-$(CONFIG_MFD_HI6421_PMIC) += hi6421-pmic-core.o obj-$(CONFIG_MFD_HI655X_PMIC) += hi655x-pmic.o obj-$(CONFIG_MFD_DLN2) += dln2.o +obj-$(CONFIG_MFD_RT4831) += rt4831.o obj-$(CONFIG_MFD_RT5033) += rt5033.o obj-$(CONFIG_MFD_SKY81452) += sky81452.o diff --git a/drivers/mfd/rt4831.c b/drivers/mfd/rt4831.c new file mode 100644 index 00000000..b169781 --- /dev/null +++ b/drivers/mfd/rt4831.c @@ -0,0 +1,115 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (c) 2021 Richtek Technology Corp. + * + * Author: ChiYuan Huang + */ + +#include +#include +#include +#include +#include +#include + +#define RT4831_REG_REVISION 0x01 +#define RT4831_REG_ENABLE 0x08 +#define RT4831_REG_I2CPROT 0x15 + +#define RICHTEK_VENDOR_ID 0x03 +#define RT4831_VID_MASK GENMASK(1, 0) +#define RT4831_RESET_MASK BIT(7) +#define RT4831_I2CSAFETMR_MASK BIT(0) + +static const struct mfd_cell rt4831_subdevs[] = { + MFD_CELL_OF("rt4831-backlight", NULL, NULL, 0, 0, "richtek,rt4831-backlight"), + MFD_CELL_NAME("rt4831-regulator") +}; + +static bool rt4831_is_accessible_reg(struct device *dev, unsigned int reg) +{ + if (reg >= RT4831_REG_REVISION && reg <= RT4831_REG_I2CPROT) + return true; + return false; +} + +static const struct regmap_config rt4831_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = RT4831_REG_I2CPROT, + + .readable_reg = rt4831_is_accessible_reg, + .writeable_reg = rt4831_is_accessible_reg, +}; + +static int rt4831_probe(struct i2c_client *client) +{ + struct gpio_desc *enable_gpio; + struct regmap *regmap; + unsigned int chip_id; + int ret; + + enable_gpio = devm_gpiod_get_optional(&client->dev, "enable", GPIOD_OUT_HIGH); + if (IS_ERR(enable_gpio)) { + dev_err(&client->dev, "Failed to get 'enable' GPIO\n"); + return PTR_ERR(enable_gpio); + } + + regmap = devm_regmap_init_i2c(client, &rt4831_regmap_config); + if (IS_ERR(regmap)) { + dev_err(&client->dev, "Failed to initialize regmap\n"); + return PTR_ERR(regmap); + } + + ret = regmap_read(regmap, RT4831_REG_REVISION, &chip_id); + if (ret) { + dev_err(&client->dev, "Failed to get H/W revision\n"); + return ret; + } + + if ((chip_id & RT4831_VID_MASK) != RICHTEK_VENDOR_ID) { + dev_err(&client->dev, "Chip vendor ID 0x%02x not matched\n", chip_id); + return -ENODEV; + } + + /* + * Used to prevent the abnormal shutdown. + * If SCL/SDA both keep low for one second to reset HW. + */ + ret = regmap_update_bits(regmap, RT4831_REG_I2CPROT, RT4831_I2CSAFETMR_MASK, + RT4831_I2CSAFETMR_MASK); + if (ret) { + dev_err(&client->dev, "Failed to enable I2C safety timer\n"); + return ret; + } + + return devm_mfd_add_devices(&client->dev, PLATFORM_DEVID_AUTO, rt4831_subdevs, + ARRAY_SIZE(rt4831_subdevs), NULL, 0, NULL); +} + +static int rt4831_remove(struct i2c_client *client) +{ + struct regmap *regmap = dev_get_regmap(&client->dev, NULL); + + /* Disable WLED and DSV outputs */ + return regmap_update_bits(regmap, RT4831_REG_ENABLE, RT4831_RESET_MASK, RT4831_RESET_MASK); +} + +static const struct of_device_id __maybe_unused rt4831_of_match[] = { + { .compatible = "richtek,rt4831", }, + {} +}; +MODULE_DEVICE_TABLE(of, rt4831_of_match); + +static struct i2c_driver rt4831_driver = { + .driver = { + .name = "rt4831", + .of_match_table = rt4831_of_match, + }, + .probe_new = rt4831_probe, + .remove = rt4831_remove, +}; +module_i2c_driver(rt4831_driver); + +MODULE_AUTHOR("ChiYuan Huang "); +MODULE_LICENSE("GPL v2");