R-Car PWM controller requires the gpio to output zero duty,
this patch allows to roll it back from gpio to mux when the gpio
is freed.
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
---
drivers/pinctrl/sh-pfc/pinctrl.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/drivers/pinctrl/sh-pfc/pinctrl.c b/drivers/pinctrl/sh-pfc/pinctrl.c
index ab2aa93..c9bdca5 100644
--- a/drivers/pinctrl/sh-pfc/pinctrl.c
+++ b/drivers/pinctrl/sh-pfc/pinctrl.c
@@ -26,6 +26,7 @@
#include "../pinconf.h"
struct sh_pfc_pin_config {
+ unsigned int mux_mark;
bool mux_set;
bool gpio_enabled;
};
@@ -353,6 +354,16 @@ static int sh_pfc_func_set_mux(struct pinctrl_dev *pctldev, unsigned selector,
spin_lock_irqsave(&pfc->lock, flags);
for (i = 0; i < grp->nr_pins; ++i) {
+ int idx = sh_pfc_get_pin_index(pfc, grp->pins[i]);
+ struct sh_pfc_pin_config *cfg = &pmx->configs[idx];
+
+ /*
+ * This driver cannot manage both gpio and mux when the gpio
+ * pin is already enabled. So, this function failed.
+ */
+ if (cfg->gpio_enabled)
+ return -EBUSY;
+
ret = sh_pfc_config_mux(pfc, grp->mux[i], PINMUX_TYPE_FUNCTION);
if (ret < 0)
goto done;
@@ -364,6 +375,7 @@ static int sh_pfc_func_set_mux(struct pinctrl_dev *pctldev, unsigned selector,
struct sh_pfc_pin_config *cfg = &pmx->configs[idx];
cfg->mux_set = true;
+ cfg->mux_mark = grp->mux[i];
}
done:
@@ -417,6 +429,9 @@ static void sh_pfc_gpio_disable_free(struct pinctrl_dev *pctldev,
spin_lock_irqsave(&pfc->lock, flags);
cfg->gpio_enabled = false;
+ /* If mux is already set, this configures it here */
+ if (cfg->mux_set)
+ sh_pfc_config_mux(pfc, cfg->mux_mark, PINMUX_TYPE_FUNCTION);
spin_unlock_irqrestore(&pfc->lock, flags);
}
--
2.7.4
