Some devices need a logic level low instead of high to be in the
off state.
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 | 15 +++++++++++----
2 files changed, 13 insertions(+), 4 deletions(-)
diff --git a/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.txt b/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.txt
index 703a714201d8..bea306d772d1 100644
--- a/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.txt
+++ b/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.txt
@@ -22,6 +22,8 @@ Optional properties:
the reset-gpios (if any) are asserted
- post-power-on-delay-ms : Delay in ms after powering the card and
de-asserting the reset-gpios (if any)
+- invert-off-state: Invert the power down state for the reset-gpios (if any)
+ and pwrdn-gpios (if any)
Example:
diff --git a/drivers/mmc/core/pwrseq_simple.c b/drivers/mmc/core/pwrseq_simple.c
index adf1f7161fe3..857dde3e0456 100644
--- a/drivers/mmc/core/pwrseq_simple.c
+++ b/drivers/mmc/core/pwrseq_simple.c
@@ -26,6 +26,7 @@
struct mmc_pwrseq_simple {
struct mmc_pwrseq pwrseq;
bool clk_enabled;
+ bool invert_off_state;
u32 pre_power_on_delay_ms;
u32 post_power_on_delay_ms;
struct clk *ext_clk;
@@ -80,9 +81,10 @@ static void mmc_pwrseq_simple_post_power_on(struct mmc_host *host)
static void mmc_pwrseq_simple_power_off(struct mmc_host *host)
{
struct mmc_pwrseq_simple *pwrseq = to_pwrseq_simple(host->pwrseq);
+ unsigned int off_state = !(pwrseq->invert_off_state);
- mmc_pwrseq_simple_set_gpios_value(pwrseq, pwrseq->reset_gpios, 1);
- mmc_pwrseq_simple_set_gpios_value(pwrseq, pwrseq->pwrdn_gpios, 1);
+ mmc_pwrseq_simple_set_gpios_value(pwrseq, pwrseq->reset_gpios, off_state);
+ mmc_pwrseq_simple_set_gpios_value(pwrseq, pwrseq->pwrdn_gpios, off_state);
if (!IS_ERR(pwrseq->ext_clk) && pwrseq->clk_enabled) {
clk_disable_unprepare(pwrseq->ext_clk);
@@ -107,6 +109,7 @@ static int mmc_pwrseq_simple_probe(struct platform_device *pdev)
{
struct mmc_pwrseq_simple *pwrseq;
struct device *dev = &pdev->dev;
+ bool invert_off_state = false;
pwrseq = devm_kzalloc(dev, sizeof(*pwrseq), GFP_KERNEL);
if (!pwrseq)
@@ -116,8 +119,11 @@ static int mmc_pwrseq_simple_probe(struct platform_device *pdev)
if (IS_ERR(pwrseq->ext_clk) && PTR_ERR(pwrseq->ext_clk) != -ENOENT)
return PTR_ERR(pwrseq->ext_clk);
+ if (device_property_read_bool(dev, "invert-off-state"))
+ invert_off_state = true;
+
pwrseq->reset_gpios = devm_gpiod_get_array(dev, "reset",
- GPIOD_OUT_HIGH);
+ invert_off_state ? GPIOD_OUT_LOW : GPIOD_OUT_HIGH);
if (IS_ERR(pwrseq->reset_gpios) &&
PTR_ERR(pwrseq->reset_gpios) != -ENOENT &&
PTR_ERR(pwrseq->reset_gpios) != -ENOSYS) {
@@ -125,7 +131,7 @@ static int mmc_pwrseq_simple_probe(struct platform_device *pdev)
}
pwrseq->pwrdn_gpios = devm_gpiod_get_array(dev, "pwrdn",
- GPIOD_OUT_HIGH);
+ invert_off_state ? GPIOD_OUT_LOW : GPIOD_OUT_HIGH);
device_property_read_u32(dev, "pre-power-on-delay-ms",
&pwrseq->pre_power_on_delay_ms);
@@ -136,6 +142,7 @@ static int mmc_pwrseq_simple_probe(struct platform_device *pdev)
pwrseq->pwrseq.dev = dev;
pwrseq->pwrseq.ops = &mmc_pwrseq_simple_ops;
pwrseq->pwrseq.owner = THIS_MODULE;
+ pwrseq->invert_off_state = invert_off_state;
platform_set_drvdata(pdev, pwrseq);
return mmc_pwrseq_register(&pwrseq->pwrseq);
--
2.7.4
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
