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authorBen Hutchings <ben.hutchings@codethink.co.uk>2015-06-30 17:53:59 +0100
committerLinus Walleij <linus.walleij@linaro.org>2015-08-24 10:44:54 +0200
commit5b9eaa5659b32cf6c85a492d2e3bfa7a3a413144 (patch)
treedbcdccf7c6b25f9459b5e20e6879ca919df08eeb
parent15ee1f7d1432c8a781df5d8f92c18bd952088667 (diff)
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pinctrl: sh-pfc: Implement pinconf power-source param for voltage switching
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@codethink.co.uk> Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
-rw-r--r--Documentation/devicetree/bindings/pinctrl/renesas,pfc-pinctrl.txt4
-rw-r--r--drivers/pinctrl/sh-pfc/pinctrl.c44
-rw-r--r--drivers/pinctrl/sh-pfc/sh_pfc.h5
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 e089142cfb14..9496934528bd 100644
--- a/Documentation/devicetree/bindings/pinctrl/renesas,pfc-pinctrl.txt
+++ b/Documentation/devicetree/bindings/pinctrl/renesas,pfc-pinctrl.txt
@@ -71,7 +71,9 @@ 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 6fe7459f0ccb..863c3e30ce05 100644
--- a/drivers/pinctrl/sh-pfc/pinctrl.c
+++ b/drivers/pinctrl/sh-pfc/pinctrl.c
@@ -491,6 +491,9 @@ 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;
}
@@ -503,7 +506,6 @@ 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;
@@ -511,7 +513,9 @@ 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;
@@ -524,6 +528,24 @@ 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;
@@ -560,6 +582,24 @@ 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 {