The recent introduction of reset control in pwrseq_simple introduced
a regression for platforms without RESET_CONTROLLER support, because
devm_reset_control_get_optional_shared() would return NULL and make all
resets no-ops. Instead of enforcing this dependency, rely on this behavior
to determine reset support. As a benefit we can get the rid of the
use_reset flag.
Fixes: 73bf4b7381f7 ("mmc: pwrseq_simple: add support for one reset control")
Signed-off-by: Stefan Wahren <wahrenst@xxxxxxx>
---
drivers/mmc/core/pwrseq_simple.c | 20 +++++++++++---------
1 file changed, 11 insertions(+), 9 deletions(-)
Changes in V2:
- add explaining comment as suggested by Marco Felsch
diff --git a/drivers/mmc/core/pwrseq_simple.c b/drivers/mmc/core/pwrseq_simple.c
index 24e4e63a5dc8..37cd858df0f4 100644
--- a/drivers/mmc/core/pwrseq_simple.c
+++ b/drivers/mmc/core/pwrseq_simple.c
@@ -32,7 +32,6 @@ struct mmc_pwrseq_simple {
struct clk *ext_clk;
struct gpio_descs *reset_gpios;
struct reset_control *reset_ctrl;
- bool use_reset;
};
#define to_pwrseq_simple(p) container_of(p, struct mmc_pwrseq_simple, pwrseq)
@@ -71,7 +70,7 @@ static void mmc_pwrseq_simple_pre_power_on(struct mmc_host *host)
pwrseq->clk_enabled = true;
}
- if (pwrseq->use_reset) {
+ if (pwrseq->reset_ctrl) {
reset_control_deassert(pwrseq->reset_ctrl);
reset_control_assert(pwrseq->reset_ctrl);
} else
@@ -82,7 +81,7 @@ static void mmc_pwrseq_simple_post_power_on(struct mmc_host *host)
{
struct mmc_pwrseq_simple *pwrseq = to_pwrseq_simple(host->pwrseq);
- if (pwrseq->use_reset)
+ if (pwrseq->reset_ctrl)
reset_control_deassert(pwrseq->reset_ctrl);
else
mmc_pwrseq_simple_set_gpios_value(pwrseq, 0);
@@ -95,7 +94,7 @@ static void mmc_pwrseq_simple_power_off(struct mmc_host *host)
{
struct mmc_pwrseq_simple *pwrseq = to_pwrseq_simple(host->pwrseq);
- if (pwrseq->use_reset)
+ if (pwrseq->reset_ctrl)
reset_control_assert(pwrseq->reset_ctrl);
else
mmc_pwrseq_simple_set_gpios_value(pwrseq, 1);
@@ -137,15 +136,18 @@ static int mmc_pwrseq_simple_probe(struct platform_device *pdev)
return dev_err_probe(dev, PTR_ERR(pwrseq->ext_clk), "external clock not ready\n");
ngpio = of_count_phandle_with_args(dev->of_node, "reset-gpios", "#gpio-cells");
- if (ngpio == 1)
- pwrseq->use_reset = true;
-
- if (pwrseq->use_reset) {
+ if (ngpio == 1) {
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 control not ready\n");
- } else {
+ }
+
+ /*
+ * Fallback to GPIO based reset control in case of multiple reset lines
+ * are specified or the platform doesn't have support for RESET at all.
+ */
+ if (!pwrseq->reset_ctrl) {
pwrseq->reset_gpios = devm_gpiod_get_array(dev, "reset", GPIOD_OUT_HIGH);
if (IS_ERR(pwrseq->reset_gpios) &&
PTR_ERR(pwrseq->reset_gpios) != -ENOENT &&
--
2.34.1
