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Reset controls being refcounted, they allow to use shared resets or gpios across drivers. Support of reset control is limited to one single reset control. Signed-off-by: Catalin Popescu --- .../bindings/mmc/mmc-pwrseq-simple.yaml | 21 +++++++++++++++++-- 1 file changed, 19 insertions(+), 2 deletions(-) diff --git a/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.yaml b/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.yaml index 00feaafc1063..da218260af01 100644 --- a/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.yaml +++ b/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.yaml @@ -16,12 +16,13 @@ description: properties: compatible: - const: mmc-pwrseq-simple + enum: + - mmc-pwrseq-simple + - mmc-pwrseq-simple-reset reset-gpios: minItems: 1 # Put some limit to avoid false warnings - maxItems: 32 description: contains a list of GPIO specifiers. 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Fri, 4 Oct 2024 14:07:43 +0200 From: Catalin Popescu To: ulf.hansson@linaro.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, p.zabel@pengutronix.de Cc: linux-mmc@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, m.felsch@pengutronix.de, bsp-development.geo@leica-geosystems.com, Catalin Popescu Subject: [PATCH 2/2] mmc: pwrseq_simple: add support for reset control Date: Fri, 4 Oct 2024 14:07:40 +0200 Message-Id: <20241004120740.2887776-2-catalin.popescu@leica-geosystems.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241004120740.2887776-1-catalin.popescu@leica-geosystems.com> References: <20241004120740.2887776-1-catalin.popescu@leica-geosystems.com> Precedence: bulk X-Mailing-List: linux-mmc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-OriginalArrivalTime: 04 Oct 2024 12:07:43.0067 (UTC) FILETIME=[042DCAB0:01DB1656] X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AM4PEPF00027A5D:EE_|PAXPR06MB7775:EE_ X-MS-Office365-Filtering-Correlation-Id: 02af0b58-1fdb-4f5f-d8f0-08dce46d26e2 X-SET-LOWER-SCL-SCANNER: YES X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Add support for reset control while keeping in place the support for gpios. Use compatible string to choose between reset control ("mmc-pwrseq-simple-reset") and reset gpios ("mmc-pwrseq-simple"). Only one reset control is supported. Signed-off-by: Catalin Popescu --- drivers/mmc/core/pwrseq_simple.c | 58 ++++++++++++++++++++++++++------ 1 file changed, 48 insertions(+), 10 deletions(-) diff --git a/drivers/mmc/core/pwrseq_simple.c b/drivers/mmc/core/pwrseq_simple.c index 9e016b0746f5..6495b97d48d9 100644 --- a/drivers/mmc/core/pwrseq_simple.c +++ b/drivers/mmc/core/pwrseq_simple.c @@ -17,11 +17,17 @@ #include #include #include +#include +#include #include #include "pwrseq.h" +struct mmc_pwrseq_simple_data { + bool use_reset; +}; + struct mmc_pwrseq_simple { struct mmc_pwrseq pwrseq; bool clk_enabled; @@ -29,6 +35,8 @@ struct mmc_pwrseq_simple { u32 power_off_delay_us; struct clk *ext_clk; struct gpio_descs *reset_gpios; + struct reset_control *reset_ctrl; + const struct mmc_pwrseq_simple_data *data; }; #define to_pwrseq_simple(p) container_of(p, struct mmc_pwrseq_simple, pwrseq) @@ -67,14 +75,21 @@ static void mmc_pwrseq_simple_pre_power_on(struct mmc_host *host) pwrseq->clk_enabled = true; } - mmc_pwrseq_simple_set_gpios_value(pwrseq, 1); + if (pwrseq->data->use_reset) { + reset_control_deassert(pwrseq->reset_ctrl); + reset_control_assert(pwrseq->reset_ctrl); + } else + mmc_pwrseq_simple_set_gpios_value(pwrseq, 1); } static void mmc_pwrseq_simple_post_power_on(struct mmc_host *host) { struct mmc_pwrseq_simple *pwrseq = to_pwrseq_simple(host->pwrseq); - mmc_pwrseq_simple_set_gpios_value(pwrseq, 0); + if (pwrseq->data->use_reset) + reset_control_deassert(pwrseq->reset_ctrl); + else + mmc_pwrseq_simple_set_gpios_value(pwrseq, 0); if (pwrseq->post_power_on_delay_ms) msleep(pwrseq->post_power_on_delay_ms); @@ -84,7 +99,10 @@ static void mmc_pwrseq_simple_power_off(struct mmc_host *host) { struct mmc_pwrseq_simple *pwrseq = to_pwrseq_simple(host->pwrseq); - mmc_pwrseq_simple_set_gpios_value(pwrseq, 1); + if (pwrseq->data->use_reset) + reset_control_assert(pwrseq->reset_ctrl); + else + mmc_pwrseq_simple_set_gpios_value(pwrseq, 1); if (pwrseq->power_off_delay_us) usleep_range(pwrseq->power_off_delay_us, @@ -102,8 +120,17 @@ static const struct mmc_pwrseq_ops mmc_pwrseq_simple_ops = { .power_off = mmc_pwrseq_simple_power_off, }; +struct mmc_pwrseq_simple_data mmc_pwrseq_simple_gpio = { + .use_reset = false, +}; + +struct mmc_pwrseq_simple_data mmc_pwrseq_simple_reset = { + .use_reset = true, +}; + static const struct of_device_id mmc_pwrseq_simple_of_match[] = { - { .compatible = "mmc-pwrseq-simple",}, + { .compatible = "mmc-pwrseq-simple", .data = &mmc_pwrseq_simple_gpio }, + { .compatible = "mmc-pwrseq-simple-reset", .data = &mmc_pwrseq_simple_reset }, {/* sentinel */}, }; MODULE_DEVICE_TABLE(of, mmc_pwrseq_simple_of_match); @@ -121,12 +148,23 @@ static int mmc_pwrseq_simple_probe(struct platform_device *pdev) if (IS_ERR(pwrseq->ext_clk) && PTR_ERR(pwrseq->ext_clk) != -ENOENT) return dev_err_probe(dev, PTR_ERR(pwrseq->ext_clk), "external clock not ready\n"); - pwrseq->reset_gpios = devm_gpiod_get_array(dev, "reset", - GPIOD_OUT_HIGH); - if (IS_ERR(pwrseq->reset_gpios) && - PTR_ERR(pwrseq->reset_gpios) != -ENOENT && - PTR_ERR(pwrseq->reset_gpios) != -ENOSYS) { - return dev_err_probe(dev, PTR_ERR(pwrseq->reset_gpios), "reset GPIOs not ready\n"); + pwrseq->data = of_device_get_match_data(dev); + if (!pwrseq->data) + return -EINVAL; + + if (pwrseq->data->use_reset) { + pwrseq->reset_ctrl = devm_reset_control_get_optional_shared(dev, NULL); + if (IS_ERR(pwrseq->reset_ctrl)) + return dev_err_probe(dev, PTR_ERR(pwrseq->reset_ctrl), + "reset controls not ready\n"); + } else { + pwrseq->reset_gpios = devm_gpiod_get_array(dev, "reset", GPIOD_OUT_HIGH); + if (IS_ERR(pwrseq->reset_gpios) && + PTR_ERR(pwrseq->reset_gpios) != -ENOENT && + PTR_ERR(pwrseq->reset_gpios) != -ENOSYS) { + return dev_err_probe(dev, PTR_ERR(pwrseq->reset_gpios), + "reset GPIOs not ready\n"); + } } device_property_read_u32(dev, "post-power-on-delay-ms",