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 voltage, and the SD driver should do that when selecting a higher-speed mode.
Add a flag for pins that support low voltage mode and SoC operations to get and set it. Implement the pinconf power-source parameter using these operations. Signed-off-by: Ben Hutchings <[email protected]> --- .../bindings/pinctrl/renesas,pfc-pinctrl.txt | 4 ++- drivers/pinctrl/sh-pfc/pinctrl.c | 34 ++++++++++++++++++++-- drivers/pinctrl/sh-pfc/sh_pfc.h | 6 ++++ 3 files changed, 41 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..93651742f1c1 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 +can operate with either 3.3V or 1.8V signals, the power-source value should +be 0 for 3.3V or 1 for 1.8V. GPIO diff --git a/drivers/pinctrl/sh-pfc/pinctrl.c b/drivers/pinctrl/sh-pfc/pinctrl.c index 072e7c62cab7..fa4066d4bc61 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_LOW_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 +502,16 @@ static int sh_pfc_pinconf_get(struct pinctrl_dev *pctldev, unsigned _pin, *config = 0; break; + } + + case PIN_CONFIG_POWER_SOURCE: + if (!pfc->info->ops || !pfc->info->ops->get_low_voltage) + return -ENOTSUPP; + + spin_lock_irqsave(&pfc->lock, flags); + *config = pfc->info->ops->get_low_voltage(pfc, _pin); + spin_unlock_irqrestore(&pfc->lock, flags); + break; default: return -ENOTSUPP; @@ -534,6 +548,22 @@ 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]); + + if (!pfc->info->ops || !pfc->info->ops->set_low_voltage) + return -ENOTSUPP; + if (arg > 1) + return -ENOTSUPP; + + spin_lock_irqsave(&pfc->lock, flags); + pfc->info->ops->set_low_voltage(pfc, _pin, arg); + spin_unlock_irqrestore(&pfc->lock, flags); + + break; + } + default: return -ENOTSUPP; } diff --git a/drivers/pinctrl/sh-pfc/sh_pfc.h b/drivers/pinctrl/sh-pfc/sh_pfc.h index c7508d5f6886..b95d60bf2f1b 100644 --- a/drivers/pinctrl/sh-pfc/sh_pfc.h +++ b/drivers/pinctrl/sh-pfc/sh_pfc.h @@ -13,6 +13,7 @@ #include <linux/bug.h> #include <linux/stringify.h> +#include <linux/pinctrl/pinconf-generic.h> enum { PINMUX_TYPE_NONE, @@ -26,8 +27,11 @@ 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_LOW_VOLTAGE (1 << 4) #define SH_PFC_PIN_CFG_NO_GPIO (1 << 31) +struct sh_pfc; + struct sh_pfc_pin { u16 pin; u16 enum_id; @@ -121,6 +125,8 @@ 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); + bool (*get_low_voltage)(struct sh_pfc *pfc, unsigned int pin); + void (*set_low_voltage)(struct sh_pfc *pfc, unsigned int pin, bool low); }; struct sh_pfc_soc_info { -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
