From mboxrd@z Thu Jan 1 00:00:00 1970 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=-12.6 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 97C6FC388F2 for ; Mon, 2 Nov 2020 03:13:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 44E6B20870 for ; Mon, 2 Nov 2020 03:13:32 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="gWOLlz1C" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727726AbgKBDNb (ORCPT ); Sun, 1 Nov 2020 22:13:31 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57156 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727450AbgKBDNa (ORCPT ); Sun, 1 Nov 2020 22:13:30 -0500 Received: from mail-pg1-x543.google.com (mail-pg1-x543.google.com [IPv6:2607:f8b0:4864:20::543]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C5F37C0617A6; Sun, 1 Nov 2020 19:13:30 -0800 (PST) Received: by mail-pg1-x543.google.com with SMTP id f38so9583340pgm.2; Sun, 01 Nov 2020 19:13:30 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id; bh=br7iRkZD/QNmcvvpPjhy6T2C30IgSCEp4e9zAlXf3L8=; b=gWOLlz1Ci/msu83yaQ0yUMv0wq+VUUAzulVr8SBlVt1QqTkhg8KpLpvuPlGvLD4lqy pTaW3euCtIpwC6cpOq4Qo80yX2CiNCZWocuuJgUqIbLqdbcGEMlPwq8CgV9Y38rHQ4sP ofy7JtLbqJTDx1+ybt98Dx21TnDmKyQC082s3djgERgVT5KFAJn1wQirKL/9ktFTVLXT i5SteabK70H5fDIBNpDvm0GvOnXpKmJ+2M6Ibn2z+DExXM2dR+qJDzBNbykQR9PbZ+td UQ+j3y6CMWBGAuDBkYqIz6SwQZCohG1Ix4rGCeGtPb9b3QnNu78FyPj+VBrr9NvBR1mC Qdpw== 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=br7iRkZD/QNmcvvpPjhy6T2C30IgSCEp4e9zAlXf3L8=; b=UjGFUCodelYUW2uRsV3xjos3F+vFelZ51NY0W4eUz0na+cetE58IAoag8cbnhPqbOZ R8fWdUi71fYp+ez3rb5fZzIQhOm9fYNcNRCbcWNXoY7VVCBDxIvMmvfEfR7ONd3JZ3aL bDtAMyYQrb4VURXt/M7SrJaozF4bm/zbtrtONXLqRaZGOzAyzyuzm9Qtp1F0fnuZAwpS 18AvJcmt+RAXSHk+h7WbjPRGVWGjC6l8JJq/s6MDP4EGPaLZJ3gqPbzj8EWhXY54BKSq TA2lNmyKdNbSywAu+PmD4hEzcYtm+zhhMrYfMcitZdYARGVfxzbFpu8R9xVizS6pkiqA b8bQ== X-Gm-Message-State: AOAM531ckiBQZ1Nj9hLaz/lS6sJ3diTd3pax3YTKKIzMwl1T7CCqG7/v vJaeYJmcK1cXgHEa5kn0SLo= X-Google-Smtp-Source: ABdhPJyW0VO2mAVgT7JxSL9P4CIJkvJB4aYYlh4f+ATPa2sQEXDcAcmmVMXH8yLslKIaenu6GIwkcw== X-Received: by 2002:a63:160b:: with SMTP id w11mr11800931pgl.110.1604286810204; Sun, 01 Nov 2020 19:13:30 -0800 (PST) Received: from localhost.localdomain ([2402:7500:57c:483e:4828:fb14:ce19:d9d0]) by smtp.gmail.com with ESMTPSA id y137sm12368408pfc.77.2020.11.01.19.13.27 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sun, 01 Nov 2020 19:13:29 -0800 (PST) From: cy_huang To: lee.jones@linaro.org, robh+dt@kernel.org Cc: cy_huang@richtek.com, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org Subject: [PATCH v1 1/2] mfd: rt4831: Adds support for Richtek RT4831 MFD core Date: Mon, 2 Nov 2020 11:13:22 +0800 Message-Id: <1604286803-20698-1-git-send-email-u0084500@gmail.com> X-Mailer: git-send-email 2.7.4 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: ChiYuan Huang Adds support Richtek RT4831 MFD core. RT4831 includes backlight and DSV part that can provode display panel for postive and negative voltage and WLED driving. Signed-off-by: ChiYuan Huang --- drivers/mfd/Kconfig | 11 +++++ drivers/mfd/Makefile | 1 + drivers/mfd/rt4831-core.c | 119 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 131 insertions(+) create mode 100644 drivers/mfd/rt4831-core.c diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index 8b99a13..a22f002 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -1088,6 +1088,17 @@ config MFD_RDC321X southbridge which provides access to GPIOs and Watchdog using the southbridge PCI device configuration space. +config MFD_RT4831 + tristate "Richtek RT4831 WLED and DSV IC" + depends on I2C + select MFD_CORE + select REGMAP_I2C + help + This enables support for the Richtek RT4831. + RT4831 includes WLED driver and DisplayBias voltage(+/-) regulator. + It's common used to provide the display power and to drive the + display backlight WLED. + config MFD_RT5033 tristate "Richtek RT5033 Power Management IC" depends on I2C diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index 1780019..4108141 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-$(CONFIG_MFD_RT4831) += rt4831-core.o obj-$(CONFIG_MFD_RT5033) += rt5033.o obj-$(CONFIG_MFD_SKY81452) += sky81452.o diff --git a/drivers/mfd/rt4831-core.c b/drivers/mfd/rt4831-core.c new file mode 100644 index 00000000..5342959 --- /dev/null +++ b/drivers/mfd/rt4831-core.c @@ -0,0 +1,119 @@ +// SPDX-License-Identifier: GPL-2.0+ + +#include +#include +#include +#include +#include +#include + +#define RT4831_REG_REVISION 0x01 +#define RT4831_REG_ENABLE 0x08 +#define RT4831_REG_I2CPROT 0x15 + +#define RICHTEK_VID 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[] = { + OF_MFD_CELL("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; + struct regmap *regmap; + unsigned int val; + int ret; + + enable = devm_gpiod_get_optional(&client->dev, "enable", GPIOD_OUT_HIGH); + if (IS_ERR(enable)) { + dev_err(&client->dev, "Failed to get chip enable gpio\n"); + return PTR_ERR(enable); + } + + regmap = devm_regmap_init_i2c(client, &rt4831_regmap_config); + if (IS_ERR(regmap)) { + dev_err(&client->dev, "Failed to init regmap\n"); + return PTR_ERR(regmap); + } + + ret = regmap_read(regmap, RT4831_REG_REVISION, &val); + if (ret) { + dev_err(&client->dev, "Fail to get version id\n"); + return ret; + } + + if ((val & RT4831_VID_MASK) != RICHTEK_VID) { + dev_err(&client->dev, "VID not matched, val = 0x%02x\n", val); + 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); + + /* Make sure all off before module removal */ + return regmap_update_bits(regmap, RT4831_REG_ENABLE, RT4831_RESET_MASK, RT4831_RESET_MASK); +} + +static void rt4831_shutdown(struct i2c_client *client) +{ + struct regmap *regmap = dev_get_regmap(&client->dev, NULL); + + /* Make sure all off before machine shutdown */ + 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 = of_match_ptr(rt4831_of_match), + }, + .probe_new = rt4831_probe, + .remove = rt4831_remove, + .shutdown = rt4831_shutdown, +}; +module_i2c_driver(rt4831_driver); + +MODULE_AUTHOR("ChiYuan Huang "); +MODULE_LICENSE("GPL v2"); -- 2.7.4