| Message ID | 1435683239.23818.61.camel@codethink.co.uk (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Hi Ben, Thank you for the patch. On Tuesday 30 June 2015 17:53:59 Ben Hutchings wrote: > 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> > --- > .../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 {
On Tue, Jun 30, 2015 at 6:53 PM, Ben Hutchings <ben.hutchings@codethink.co.uk> wrote: > 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> Patch applied with Laurent's ACK. Yours, Linus Walleij -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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 {
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> --- .../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(-)