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Commit e9256e14 authored by Ulf Hansson's avatar Ulf Hansson
Browse files

mmc: pwrseq_simple: Parse DTS for the power-off-delay-us property 



If the optional power-off-delay-us property is found, insert the
corresponding delay after asserting the GPIO during power off. This enables
a graceful shutdown sequence for some devices.

Cc: linux-mmc@vger.kernel.org
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
parent c477ebe2

drivers/mmc/core/pwrseq_simple.c

+7 −0
Original line number Diff line number Diff line
@@ -27,6 +27,7 @@ struct mmc_pwrseq_simple { 
	struct mmc_pwrseq pwrseq;

	bool clk_enabled;

	u32 post_power_on_delay_ms;

	u32 power_off_delay_us;

	struct clk *ext_clk;

	struct gpio_descs *reset_gpios;

};
@@ -78,6 +79,10 @@ static void mmc_pwrseq_simple_power_off(struct mmc_host *host) 


	mmc_pwrseq_simple_set_gpios_value(pwrseq, 1);



	if (pwrseq->power_off_delay_us)

		usleep_range(pwrseq->power_off_delay_us,

			2 * pwrseq->power_off_delay_us);



	if (!IS_ERR(pwrseq->ext_clk) && pwrseq->clk_enabled) {

		clk_disable_unprepare(pwrseq->ext_clk);

		pwrseq->clk_enabled = false;
@@ -119,6 +124,8 @@ static int mmc_pwrseq_simple_probe(struct platform_device *pdev) 


	device_property_read_u32(dev, "post-power-on-delay-ms",

				 &pwrseq->post_power_on_delay_ms);

	device_property_read_u32(dev, "power-off-delay-us",

				 &pwrseq->power_off_delay_us);



	pwrseq->pwrseq.dev = dev;

	pwrseq->pwrseq.ops = &mmc_pwrseq_simple_ops;