From patchwork Mon Mar 6 09:00:07 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Biju Das X-Patchwork-Id: 660235 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 D0DC1C61DA4 for ; Mon, 6 Mar 2023 09:00:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229542AbjCFJAv (ORCPT ); Mon, 6 Mar 2023 04:00:51 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36378 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229800AbjCFJAt (ORCPT ); Mon, 6 Mar 2023 04:00:49 -0500 Received: from relmlie6.idc.renesas.com (relmlor2.renesas.com [210.160.252.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 5D1B659E6; Mon, 6 Mar 2023 01:00:45 -0800 (PST) X-IronPort-AV: E=Sophos;i="5.98,236,1673881200"; d="scan'208";a="154992587" Received: from unknown (HELO relmlir6.idc.renesas.com) ([10.200.68.152]) by relmlie6.idc.renesas.com with ESMTP; 06 Mar 2023 18:00:43 +0900 Received: from localhost.localdomain (unknown [10.226.93.39]) by relmlir6.idc.renesas.com (Postfix) with ESMTP id A175341C869B; Mon, 6 Mar 2023 18:00:39 +0900 (JST) From: Biju Das To: Linus Walleij , Philipp Zabel Cc: Biju Das , Geert Uytterhoeven , Thierry Reding , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , linux-pwm@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-gpio@vger.kernel.org, Chris Paterson , Prabhakar Mahadev Lad Subject: [PATCH v6 06/13] drivers: pinctrl: renesas: Add RZ/G2L POEG driver support Date: Mon, 6 Mar 2023 09:00:07 +0000 Message-Id: <20230306090014.128732-7-biju.das.jz@bp.renesas.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230306090014.128732-1-biju.das.jz@bp.renesas.com> References: <20230306090014.128732-1-biju.das.jz@bp.renesas.com> MIME-Version: 1.0 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). Add basic support using s/w control through generic pincontrol sysfs to enable/disable output from GPT by registering with RZ/G2L pincontrol driver. Signed-off-by: Biju Das --- v5->v6: * Dropped sysfs and is handled in generic driver. v4->v5: * Updated kernel version in sysfs doc. v3->v4: * Updated commit description. v2->v3: * Added sysfs documentation for output_disable * PWM_RZG2L_GPT implies ARCH_RZG2L. So removed ARCH_RZG2L dependency * Used dev_get_drvdata to get device data * Replaced sprintf->sysfs_emit in show(). 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 | 11 + drivers/pinctrl/renesas/poeg/Makefile | 2 + drivers/pinctrl/renesas/poeg/rzg2l-poeg.c | 254 ++++++++++++++++++++++ 5 files changed, 271 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 0903a0a41831..92bdc2e1e125 100644 --- a/drivers/pinctrl/renesas/Kconfig +++ b/drivers/pinctrl/renesas/Kconfig @@ -308,4 +308,6 @@ 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$(srctree)/arch/sh/include/cpu-sh2a diff --git a/drivers/pinctrl/renesas/poeg/Kconfig b/drivers/pinctrl/renesas/poeg/Kconfig new file mode 100644 index 000000000000..306e8ae81cb2 --- /dev/null +++ b/drivers/pinctrl/renesas/poeg/Kconfig @@ -0,0 +1,11 @@ +# SPDX-License-Identifier: GPL-2.0 +config POEG_RZG2L + tristate "Renesas RZ/G2L poeg support" + depends on PWM_RZG2L_GPT || COMPILE_TEST + depends on HAS_IOMEM + help + This driver exposes the Port Output Enable for GPT(POEG) found + in Renesas RZ/G2L alike SoCs. + + To compile this driver as a module, choose M here: the module + will be called rzg2l-poeg. diff --git a/drivers/pinctrl/renesas/poeg/Makefile b/drivers/pinctrl/renesas/poeg/Makefile new file mode 100644 index 000000000000..610bdd6182be --- /dev/null +++ b/drivers/pinctrl/renesas/poeg/Makefile @@ -0,0 +1,2 @@ +# SPDX-License-Identifier: GPL-2.0 +obj-$(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..30f4352e257d --- /dev/null +++ b/drivers/pinctrl/renesas/poeg/rzg2l-poeg.c @@ -0,0 +1,254 @@ +// 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 +#include +#include + +#define POEGG_SSF BIT(3) + +#define RZG2L_POEG_MAX_INDEX 3 + +#define RZG2L_GPT_MAX_HW_CHANNELS 8 +#define RZG2L_GPT_INVALID_CHANNEL 0xff + +struct rzg2l_poeg_chip { + struct device *gpt_dev; + struct reset_control *rstc; + void __iomem *mmio; + u8 index; + u8 gpt_channels[RZG2L_GPT_MAX_HW_CHANNELS]; +}; + +static const char * const rzg2l_gpt_pins[] = { + "gpt0-pins", + "gpt1-pins", + "gpt2-pins", + "gpt3-pins", + "gpt4-pins", + "gpt5-pins", + "gpt6-pins", + "gpt7-pins", +}; + +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 int rzg2l_poeg_output_disable_user(struct rzg2l_poeg_chip *chip, + bool enable) +{ + u32 reg_val; + + reg_val = rzg2l_poeg_read(chip); + if (enable) + reg_val |= POEGG_SSF; + else + reg_val &= ~POEGG_SSF; + + rzg2l_poeg_write(chip, reg_val); + + return 0; +} + +static int rzg2l_poeg_cb(void *context, const char *fname, const char *gname, + enum pin_output_disable_conf conf, + unsigned int conf_val) +{ + bool pin_match = false; + int ret, i; + + for (i = 0; i < RZG2L_GPT_MAX_HW_CHANNELS; i++) { + if ((!strcmp(rzg2l_gpt_pins[i], fname)) && + (!strcmp(rzg2l_gpt_pins[i], gname))) { + pin_match = true; + break; + } + } + + if (!pin_match) + return -EINVAL; + + switch (conf) { + case PINCTRL_OUTPUT_DISABLE_BY_USER: + ret = rzg2l_poeg_output_disable_user(context, !!conf_val); + break; + case PINCTRL_OUTPUT_DISABLE_BY_SOC_ON_PIN_OUTPUT_HIGH: + case PINCTRL_OUTPUT_DISABLE_BY_SOC_ON_PIN_OUTPUT_LOW: + case PINCTRL_OUTPUT_DISABLE_BY_SOC_ON_DEAD_TIME_ERROR: + default: + return -EINVAL; + } + + return ret; +} + +static bool rzg2l_poeg_get_linked_gpt_channels(struct platform_device *pdev, + struct rzg2l_poeg_chip *chip, + struct device_node *gpt_np, + u8 poeg_id) +{ + struct of_phandle_args of_args; + bool ret = false; + unsigned int i; + u32 poeg_grp; + int cells; + int err; + + cells = of_property_count_u32_elems(gpt_np, "renesas,poegs"); + if (cells == -EINVAL) + return ret; + + for (i = 0 ; i < RZG2L_GPT_MAX_HW_CHANNELS; i++) + chip->gpt_channels[i] = RZG2L_GPT_INVALID_CHANNEL; + + cells >>= 1; + for (i = 0; i < cells; i++) { + err = of_parse_phandle_with_fixed_args(gpt_np, + "renesas,poegs", 1, i, + &of_args); + if (err) { + dev_err(&pdev->dev, + "Failed to parse 'renesas,poegs' property\n"); + break; + } + + if (of_args.args[0] >= RZG2L_GPT_MAX_HW_CHANNELS) { + dev_err(&pdev->dev, "Invalid channel %d >= %d\n", + of_args.args[0], RZG2L_GPT_MAX_HW_CHANNELS); + of_node_put(of_args.np); + break; + } + + if (!of_property_read_u32(of_args.np, "renesas,poeg-id", &poeg_grp)) { + if (poeg_grp == poeg_id) { + chip->gpt_channels[poeg_grp] = poeg_id; + ret = true; + } + } + + of_node_put(of_args.np); + } + + return ret; +} + +static const struct of_device_id rzg2l_poeg_of_table[] = { + { .compatible = "renesas,rzg2l-poeg", }, + { /* Sentinel */ } +}; +MODULE_DEVICE_TABLE(of, rzg2l_poeg_of_table); + +static void rzg2l_poeg_cleanup(void *data) +{ + struct rzg2l_poeg_chip *chip = data; + + put_device(chip->gpt_dev); +} + +static int rzg2l_poeg_probe(struct platform_device *pdev) +{ + struct platform_device *gpt_pdev = NULL; + struct rzg2l_poeg_chip *chip; + bool gpt_linked = false; + struct device_node *np; + u32 val; + int ret; + + chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL); + if (!chip) + return -ENOMEM; + + if (!of_property_read_u32(pdev->dev.of_node, "renesas,poeg-id", &val)) + chip->index = val; + + if (chip->index > RZG2L_POEG_MAX_INDEX) + return -EINVAL; + + np = of_parse_phandle(pdev->dev.of_node, "renesas,gpt", 0); + if (np) + gpt_pdev = of_find_device_by_node(np); + + gpt_linked = rzg2l_poeg_get_linked_gpt_channels(pdev, chip, np, + chip->index); + of_node_put(np); + if (!gpt_pdev) + return -ENODEV; + + chip->gpt_dev = &gpt_pdev->dev; + ret = devm_add_action_or_reset(&pdev->dev, + rzg2l_poeg_cleanup, chip); + if (ret < 0) + return ret; + + chip->mmio = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(chip->mmio)) + return PTR_ERR(chip->mmio); + + if (gpt_linked) + rzg2l_output_disable_cb_register(chip->gpt_dev, + rzg2l_poeg_cb, chip); + + 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_disable; + } + + return 0; + +err_pm_disable: + 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); + + 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");