mmc: pwrseq-simple: Add an optional post-power-on-delay

Some devices need a while to boot their firmware after providing clks /
de-asserting resets before they are ready to receive sdio commands.

This commits adds a post-power-on-delay-ms devicetree property to
mmc-pwrseq-simple for use with such devices.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.txt b/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.txt
index ce0e767..e254368 100644 (file)
--- a/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.txt
+++ b/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.txt
@@ -16,6 +16,8 @@ Optional properties:
   See ../clocks/clock-bindings.txt for details.
 - clock-names : Must include the following entry:
   "ext_clock" (External clock provided to the card).
+- post-power-on-delay-ms : Delay in ms after powering the card and
+       de-asserting the reset-gpios (if any)
 
 Example:
 

diff --git a/drivers/mmc/core/pwrseq_simple.c b/drivers/mmc/core/pwrseq_simple.c
index 450d907..1304160 100644 (file)
--- a/drivers/mmc/core/pwrseq_simple.c
+++ b/drivers/mmc/core/pwrseq_simple.c
@@ -16,6 +16,8 @@
 #include <linux/device.h>
 #include <linux/err.h>
 #include <linux/gpio/consumer.h>
+#include <linux/delay.h>
+#include <linux/property.h>
 
 #include <linux/mmc/host.h>
 
@@ -24,6 +26,7 @@
 struct mmc_pwrseq_simple {
        struct mmc_pwrseq pwrseq;
        bool clk_enabled;
+       u32 post_power_on_delay_ms;
        struct clk *ext_clk;
        struct gpio_descs *reset_gpios;
 };
@@ -64,6 +67,9 @@ 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->post_power_on_delay_ms)
+               msleep(pwrseq->post_power_on_delay_ms);
 }
 
 static void mmc_pwrseq_simple_power_off(struct mmc_host *host)
@@ -111,6 +117,9 @@ static int mmc_pwrseq_simple_probe(struct platform_device *pdev)
                return PTR_ERR(pwrseq->reset_gpios);
        }
 
+       device_property_read_u32(dev, "post-power-on-delay-ms",
+                                &pwrseq->post_power_on_delay_ms);
+
        pwrseq->pwrseq.dev = dev;
        pwrseq->pwrseq.ops = &mmc_pwrseq_simple_ops;
        pwrseq->pwrseq.owner = THIS_MODULE;