From patchwork Fri Jul 29 12:24:48 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Biju Das X-Patchwork-Id: 1662010 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=2620:137:e000::1:20; helo=out1.vger.email; envelope-from=linux-gpio-owner@vger.kernel.org; receiver=) Received: from out1.vger.email (out1.vger.email [IPv6:2620:137:e000::1:20]) by bilbo.ozlabs.org (Postfix) with ESMTP id 4LvRYH6cq1z9sGR for ; Fri, 29 Jul 2022 22:25:07 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230438AbiG2MZH (ORCPT ); Fri, 29 Jul 2022 08:25:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54622 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235974AbiG2MZE (ORCPT ); Fri, 29 Jul 2022 08:25:04 -0400 Received: from relmlie5.idc.renesas.com (relmlor1.renesas.com [210.160.252.171]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id BF71668DD3; Fri, 29 Jul 2022 05:25:02 -0700 (PDT) X-IronPort-AV: E=Sophos;i="5.93,201,1654527600"; d="scan'208";a="127811501" Received: from unknown (HELO relmlir6.idc.renesas.com) ([10.200.68.152]) by relmlie5.idc.renesas.com with ESMTP; 29 Jul 2022 21:25:02 +0900 Received: from localhost.localdomain (unknown [10.226.92.113]) by relmlir6.idc.renesas.com (Postfix) with ESMTP id 63A18432833F; Fri, 29 Jul 2022 21:24:59 +0900 (JST) From: Biju Das To: Linus Walleij , Philipp Zabel Cc: Biju Das , Geert Uytterhoeven , =?utf-8?q?Uwe_Kleine-K=C3=B6n?= =?utf-8?q?ig?= , linux-renesas-soc@vger.kernel.org, linux-gpio@vger.kernel.org, Chris Paterson , Biju Das , Prabhakar Mahadev Lad Subject: [PATCH v2 2/2] drivers: pinctrl: renesas: Add RZ/G2L POEG driver support Date: Fri, 29 Jul 2022 13:24:48 +0100 Message-Id: <20220729122448.498690-3-biju.das.jz@bp.renesas.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220729122448.498690-1-biju.das.jz@bp.renesas.com> References: <20220729122448.498690-1-biju.das.jz@bp.renesas.com> MIME-Version: 1.0 X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,SPF_HELO_NONE, SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org The output pins of the RZ/G2L general PWM timer (GPT) can be disabled by using the port output enabling function for the GPT (POEG). This patch series add basic support using s/w control through sysfs to enable/disable output from GPT. Signed-off-by: Biju Das --- v1->v2: * Renamed the file poeg-rzg2l->rzg2l-poeg * Removed the macro POEGG as there is only single register and updated rzg2l_poeg_write() and rzg2l_poeg_read() * Updated error handling in probe() Ref->v1: * Moved driver files from soc to pincontrol directory * Updated KConfig --- drivers/pinctrl/renesas/Kconfig | 2 + drivers/pinctrl/renesas/Makefile | 2 + drivers/pinctrl/renesas/poeg/Kconfig | 12 ++ drivers/pinctrl/renesas/poeg/Makefile | 2 + drivers/pinctrl/renesas/poeg/rzg2l-poeg.c | 147 ++++++++++++++++++++++ 5 files changed, 165 insertions(+) create mode 100644 drivers/pinctrl/renesas/poeg/Kconfig create mode 100644 drivers/pinctrl/renesas/poeg/Makefile create mode 100644 drivers/pinctrl/renesas/poeg/rzg2l-poeg.c diff --git a/drivers/pinctrl/renesas/Kconfig b/drivers/pinctrl/renesas/Kconfig index 6cc6aa7304bb..5cc6f94a4105 100644 --- a/drivers/pinctrl/renesas/Kconfig +++ b/drivers/pinctrl/renesas/Kconfig @@ -311,4 +311,6 @@ config PINCTRL_PFC_SHX3 bool "pin control support for SH-X3" if COMPILE_TEST select PINCTRL_SH_FUNC_GPIO +source "drivers/pinctrl/renesas/poeg/Kconfig" + endmenu diff --git a/drivers/pinctrl/renesas/Makefile b/drivers/pinctrl/renesas/Makefile index 558b30ce0dec..de1bb592fbf3 100644 --- a/drivers/pinctrl/renesas/Makefile +++ b/drivers/pinctrl/renesas/Makefile @@ -52,6 +52,8 @@ obj-$(CONFIG_PINCTRL_RZG2L) += pinctrl-rzg2l.o obj-$(CONFIG_PINCTRL_RZN1) += pinctrl-rzn1.o obj-$(CONFIG_PINCTRL_RZV2M) += pinctrl-rzv2m.o +obj-$(CONFIG_POEG_RZG2L) += poeg/ + ifeq ($(CONFIG_COMPILE_TEST),y) CFLAGS_pfc-sh7203.o += -I$(srctree)/arch/sh/include/cpu-sh2a CFLAGS_pfc-sh7264.o += -I$(srctree)/arch/sh/include/cpu-sh2a diff --git a/drivers/pinctrl/renesas/poeg/Kconfig b/drivers/pinctrl/renesas/poeg/Kconfig new file mode 100644 index 000000000000..efea83a60a11 --- /dev/null +++ b/drivers/pinctrl/renesas/poeg/Kconfig @@ -0,0 +1,12 @@ +# SPDX-License-Identifier: GPL-2.0 +config POEG_RZG2L + tristate "RZ/G2L poeg support" + depends on ARCH_RZG2L + depends on PWM_RZG2L_GPT + depends on HAS_IOMEM + help + This driver exposes the General Port Output Enable for PWM found + in RZ/G2L. + + To compile this driver as a module, choose M here: the module + will be called poeg-rzg2l. diff --git a/drivers/pinctrl/renesas/poeg/Makefile b/drivers/pinctrl/renesas/poeg/Makefile new file mode 100644 index 000000000000..610bdd6182be --- /dev/null +++ b/drivers/pinctrl/renesas/poeg/Makefile @@ -0,0 +1,2 @@ +# SPDX-License-Identifier: GPL-2.0 +obj-$(CONFIG_POEG_RZG2L) += rzg2l-poeg.o diff --git a/drivers/pinctrl/renesas/poeg/rzg2l-poeg.c b/drivers/pinctrl/renesas/poeg/rzg2l-poeg.c new file mode 100644 index 000000000000..0c73637f3b2c --- /dev/null +++ b/drivers/pinctrl/renesas/poeg/rzg2l-poeg.c @@ -0,0 +1,147 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Renesas RZ/G2L Port Output Enable for GPT (POEG) driver + * + * Copyright (C) 2022 Renesas Electronics Corporation + */ + +#include +#include +#include +#include +#include +#include + +#define POEGG_SSF BIT(3) + +struct rzg2l_poeg_chip { + struct reset_control *rstc; + void __iomem *mmio; +}; + +static void rzg2l_poeg_write(struct rzg2l_poeg_chip *chip, u32 data) +{ + iowrite32(data, chip->mmio); +} + +static u32 rzg2l_poeg_read(struct rzg2l_poeg_chip *chip) +{ + return ioread32(chip->mmio); +} + +static ssize_t output_disable_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct platform_device *pdev = to_platform_device(dev); + struct rzg2l_poeg_chip *chip = platform_get_drvdata(pdev); + unsigned int val; + u32 reg_val; + int ret; + + ret = kstrtouint(buf, 0, &val); + if (ret) + return ret; + + reg_val = rzg2l_poeg_read(chip); + if (val) + reg_val |= POEGG_SSF; + else + reg_val &= ~POEGG_SSF; + + rzg2l_poeg_write(chip, reg_val); + + return ret ? : count; +} + +static ssize_t output_disable_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct platform_device *pdev = to_platform_device(dev); + struct rzg2l_poeg_chip *chip = platform_get_drvdata(pdev); + u32 reg; + + reg = rzg2l_poeg_read(chip); + + return sprintf(buf, "%u\n", (reg & POEGG_SSF) ? 1 : 0); +} +static DEVICE_ATTR_RW(output_disable); + +static const struct of_device_id rzg2l_poeg_of_table[] = { + { .compatible = "renesas,rzg2l-poeg", }, + { /* Sentinel */ } +}; +MODULE_DEVICE_TABLE(of, rzg2l_poeg_of_table); + +static int rzg2l_poeg_probe(struct platform_device *pdev) +{ + struct rzg2l_poeg_chip *chip; + int ret; + + chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL); + if (!chip) + return -ENOMEM; + + chip->mmio = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(chip->mmio)) + return PTR_ERR(chip->mmio); + + chip->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL); + if (IS_ERR(chip->rstc)) + return dev_err_probe(&pdev->dev, PTR_ERR(chip->rstc), + "get reset failed\n"); + + ret = reset_control_deassert(chip->rstc); + if (ret) + return ret; + + platform_set_drvdata(pdev, chip); + pm_runtime_enable(&pdev->dev); + ret = pm_runtime_resume_and_get(&pdev->dev); + if (ret < 0) { + dev_err(&pdev->dev, "pm_runtime_resume_and_get failed: %d\n", ret); + goto err_pm; + } + + ret = device_create_file(&pdev->dev, &dev_attr_output_disable); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to create poeg sysfs: %d\n", ret); + goto err_file; + } + + return 0; + +err_file: + pm_runtime_put(&pdev->dev); +err_pm: + pm_runtime_disable(&pdev->dev); + reset_control_assert(chip->rstc); + + return ret; +} + +static int rzg2l_poeg_remove(struct platform_device *pdev) +{ + struct rzg2l_poeg_chip *chip = platform_get_drvdata(pdev); + + device_remove_file(&pdev->dev, &dev_attr_output_disable); + pm_runtime_put(&pdev->dev); + pm_runtime_disable(&pdev->dev); + reset_control_assert(chip->rstc); + + return 0; +} + +static struct platform_driver rzg2l_poeg_driver = { + .driver = { + .name = "rzg2l-poeg", + .of_match_table = of_match_ptr(rzg2l_poeg_of_table), + }, + .probe = rzg2l_poeg_probe, + .remove = rzg2l_poeg_remove, +}; +module_platform_driver(rzg2l_poeg_driver); + +MODULE_AUTHOR("Biju Das "); +MODULE_DESCRIPTION("Renesas RZ/G2L POEG Driver"); +MODULE_LICENSE("GPL");