Some devices have additional pins that control power but need to
asserted separately from reset-gpios using a defined time delay.
Cc: Tony Lindgren <tony@xxxxxxxxxxx>
Cc: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Signed-off-by: Matt Ranostay <matt@ranostay.consulting>
---
.../devicetree/bindings/mmc/mmc-pwrseq-simple.txt | 2 ++
drivers/mmc/core/pwrseq_simple.c | 26 +++++++++++++---------
2 files changed, 18 insertions(+), 10 deletions(-)
diff --git a/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.txt b/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.txt
index 88826f7d1d38..703a714201d8 100644
--- a/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.txt
+++ b/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.txt
@@ -12,6 +12,8 @@ Optional properties:
at initialization and prior we start the power up procedure of the card.
They will be de-asserted right after the power has been provided to the
card.
+- pwrdn-gpios : contains a list of GPIO specifiers. The pwrdn GPIOs are asserted
+ at initialization and prior we start the power up procedure of the card.
- clocks : Must contain an entry for the entry in clock-names.
See ../clocks/clock-bindings.txt for details.
- clock-names : Must include the following entry:
diff --git a/drivers/mmc/core/pwrseq_simple.c b/drivers/mmc/core/pwrseq_simple.c
index cb2ba7b11383..adf1f7161fe3 100644
--- a/drivers/mmc/core/pwrseq_simple.c
+++ b/drivers/mmc/core/pwrseq_simple.c
@@ -30,24 +30,23 @@ struct mmc_pwrseq_simple {
u32 post_power_on_delay_ms;
struct clk *ext_clk;
struct gpio_descs *reset_gpios;
+ struct gpio_descs *pwrdn_gpios;
};
#define to_pwrseq_simple(p) container_of(p, struct mmc_pwrseq_simple, pwrseq)
static void mmc_pwrseq_simple_set_gpios_value(struct mmc_pwrseq_simple *pwrseq,
+ struct gpio_descs *gpios,
int value)
{
- struct gpio_descs *reset_gpios = pwrseq->reset_gpios;
-
- if (!IS_ERR(reset_gpios)) {
+ if (!IS_ERR(gpios)) {
int i;
- int values[reset_gpios->ndescs];
+ int values[gpios->ndescs];
- for (i = 0; i < reset_gpios->ndescs; i++)
+ for (i = 0; i < gpios->ndescs; i++)
values[i] = value;
- gpiod_set_array_value_cansleep(
- reset_gpios->ndescs, reset_gpios->desc, values);
+ gpiod_set_array_value_cansleep(gpios->ndescs, gpios->desc, values);
}
}
@@ -60,17 +59,19 @@ static void mmc_pwrseq_simple_pre_power_on(struct mmc_host *host)
pwrseq->clk_enabled = true;
}
- mmc_pwrseq_simple_set_gpios_value(pwrseq, 1);
+ mmc_pwrseq_simple_set_gpios_value(pwrseq, pwrseq->reset_gpios, 1);
if (pwrseq->pre_power_on_delay_ms)
msleep(pwrseq->pre_power_on_delay_ms);
+
+ mmc_pwrseq_simple_set_gpios_value(pwrseq, pwrseq->pwrdn_gpios, 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);
+ mmc_pwrseq_simple_set_gpios_value(pwrseq, pwrseq->reset_gpios, 0);
if (pwrseq->post_power_on_delay_ms)
msleep(pwrseq->post_power_on_delay_ms);
@@ -80,12 +81,14 @@ 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);
+ mmc_pwrseq_simple_set_gpios_value(pwrseq, pwrseq->reset_gpios, 1);
+ mmc_pwrseq_simple_set_gpios_value(pwrseq, pwrseq->pwrdn_gpios, 1);
if (!IS_ERR(pwrseq->ext_clk) && pwrseq->clk_enabled) {
clk_disable_unprepare(pwrseq->ext_clk);
pwrseq->clk_enabled = false;
}
+
}
static const struct mmc_pwrseq_ops mmc_pwrseq_simple_ops = {
@@ -121,6 +124,9 @@ static int mmc_pwrseq_simple_probe(struct platform_device *pdev)
return PTR_ERR(pwrseq->reset_gpios);
}
+ pwrseq->pwrdn_gpios = devm_gpiod_get_array(dev, "pwrdn",
+ GPIOD_OUT_HIGH);
+
device_property_read_u32(dev, "pre-power-on-delay-ms",
&pwrseq->pre_power_on_delay_ms);
--
2.7.4
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