The pfc in the R8A7790 (and probably others in the R-Car gen 2 family)
supports switching SDHI signals between 3.3V and 1.8V nominal voltage,
and the SD driver should do that when switching to and from UHS modes.
Add a flag for pins that have configurable I/O voltage and SoC
operations to get and set the nominal voltage. Implement the pinconf
power-source parameter using these operations.
Signed-off-by: Ben Hutchings <ben.hutchings@xxxxxxxxxxxxxxx>
---
.../bindings/pinctrl/renesas,pfc-pinctrl.txt | 4 +-
drivers/pinctrl/sh-pfc/pinctrl.c | 44 +++++++++++++++++++++-
drivers/pinctrl/sh-pfc/sh_pfc.h | 5 +++
3 files changed, 50 insertions(+), 3 deletions(-)
diff --git a/Documentation/devicetree/bindings/pinctrl/renesas,pfc-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/renesas,pfc-pinctrl.txt
index bfe72ec055e3..57487481ce8c 100644
--- a/Documentation/devicetree/bindings/pinctrl/renesas,pfc-pinctrl.txt
+++ b/Documentation/devicetree/bindings/pinctrl/renesas,pfc-pinctrl.txt
@@ -69,7 +69,9 @@ Pin Configuration Node Properties:
The pin configuration parameters use the generic pinconf bindings defined in
pinctrl-bindings.txt in this directory. The supported parameters are
-bias-disable, bias-pull-up and bias-pull-down.
+bias-disable, bias-pull-up, bias-pull-down and power-source. For pins that
+have a configurable I/O voltage, the power-source value should be the
+nominal I/O voltage in millivolts.
GPIO
diff --git a/drivers/pinctrl/sh-pfc/pinctrl.c b/drivers/pinctrl/sh-pfc/pinctrl.c
index 072e7c62cab7..72ae7d0d8b75 100644
--- a/drivers/pinctrl/sh-pfc/pinctrl.c
+++ b/drivers/pinctrl/sh-pfc/pinctrl.c
@@ -465,6 +465,9 @@ static bool sh_pfc_pinconf_validate(struct sh_pfc *pfc, unsigned int _pin,
case PIN_CONFIG_BIAS_PULL_DOWN:
return pin->configs & SH_PFC_PIN_CFG_PULL_DOWN;
+ case PIN_CONFIG_POWER_SOURCE:
+ return pin->configs & SH_PFC_PIN_CFG_IO_VOLTAGE;
+
default:
return false;
}
@@ -477,7 +480,6 @@ static int sh_pfc_pinconf_get(struct pinctrl_dev *pctldev, unsigned _pin,
struct sh_pfc *pfc = pmx->pfc;
enum pin_config_param param = pinconf_to_config_param(*config);
unsigned long flags;
- unsigned int bias;
if (!sh_pfc_pinconf_validate(pfc, _pin, param))
return -ENOTSUPP;
@@ -485,7 +487,9 @@ static int sh_pfc_pinconf_get(struct pinctrl_dev *pctldev, unsigned _pin,
switch (param) {
case PIN_CONFIG_BIAS_DISABLE:
case PIN_CONFIG_BIAS_PULL_UP:
- case PIN_CONFIG_BIAS_PULL_DOWN:
+ case PIN_CONFIG_BIAS_PULL_DOWN: {
+ unsigned int bias;
+
if (!pfc->info->ops || !pfc->info->ops->get_bias)
return -ENOTSUPP;
@@ -498,6 +502,24 @@ static int sh_pfc_pinconf_get(struct pinctrl_dev *pctldev, unsigned _pin,
*config = 0;
break;
+ }
+
+ case PIN_CONFIG_POWER_SOURCE: {
+ int ret;
+
+ if (!pfc->info->ops || !pfc->info->ops->get_io_voltage)
+ return -ENOTSUPP;
+
+ spin_lock_irqsave(&pfc->lock, flags);
+ ret = pfc->info->ops->get_io_voltage(pfc, _pin);
+ spin_unlock_irqrestore(&pfc->lock, flags);
+
+ if (ret < 0)
+ return ret;
+
+ *config = ret;
+ break;
+ }
default:
return -ENOTSUPP;
@@ -534,6 +556,24 @@ static int sh_pfc_pinconf_set(struct pinctrl_dev *pctldev, unsigned _pin,
break;
+ case PIN_CONFIG_POWER_SOURCE: {
+ unsigned int arg =
+ pinconf_to_config_argument(configs[i]);
+ int ret;
+
+ if (!pfc->info->ops || !pfc->info->ops->set_io_voltage)
+ return -ENOTSUPP;
+
+ spin_lock_irqsave(&pfc->lock, flags);
+ ret = pfc->info->ops->set_io_voltage(pfc, _pin, arg);
+ spin_unlock_irqrestore(&pfc->lock, flags);
+
+ if (ret)
+ return ret;
+
+ break;
+ }
+
default:
return -ENOTSUPP;
}
diff --git a/drivers/pinctrl/sh-pfc/sh_pfc.h b/drivers/pinctrl/sh-pfc/sh_pfc.h
index c7508d5f6886..734f7a92229c 100644
--- a/drivers/pinctrl/sh-pfc/sh_pfc.h
+++ b/drivers/pinctrl/sh-pfc/sh_pfc.h
@@ -12,6 +12,7 @@
#define __SH_PFC_H
#include <linux/bug.h>
+#include <linux/pinctrl/pinconf-generic.h>
#include <linux/stringify.h>
enum {
@@ -26,6 +27,7 @@ enum {
#define SH_PFC_PIN_CFG_OUTPUT (1 << 1)
#define SH_PFC_PIN_CFG_PULL_UP (1 << 2)
#define SH_PFC_PIN_CFG_PULL_DOWN (1 << 3)
+#define SH_PFC_PIN_CFG_IO_VOLTAGE (1 << 4)
#define SH_PFC_PIN_CFG_NO_GPIO (1 << 31)
struct sh_pfc_pin {
@@ -121,6 +123,9 @@ struct sh_pfc_soc_operations {
unsigned int (*get_bias)(struct sh_pfc *pfc, unsigned int pin);
void (*set_bias)(struct sh_pfc *pfc, unsigned int pin,
unsigned int bias);
+ int (*get_io_voltage)(struct sh_pfc *pfc, unsigned int pin);
+ int (*set_io_voltage)(struct sh_pfc *pfc, unsigned int pin,
+ u16 voltage_mV);
};
struct sh_pfc_soc_info {
--
2.1.4
--
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