Implement drive strength support, by preserving the same bindings
as in Linux.
Signed-off-by: Eugen Hristev <eugen.hris...@microchip.com>
---
arch/arm/mach-at91/include/mach/atmel_pio4.h | 1 +
drivers/pinctrl/pinctrl-at91-pio4.c | 8 ++++++++
include/dt-bindings/pinctrl/at91.h | 4 ++++
3 files changed, 13 insertions(+)
diff --git a/arch/arm/mach-at91/include/mach/atmel_pio4.h
b/arch/arm/mach-at91/include/mach/atmel_pio4.h
index f348b05bc8..35ac7b2d40 100644
--- a/arch/arm/mach-at91/include/mach/atmel_pio4.h
+++ b/arch/arm/mach-at91/include/mach/atmel_pio4.h
@@ -52,6 +52,7 @@ struct atmel_pio4_port {
#define ATMEL_PIO_DRVSTR_LO (1 << 16)
#define ATMEL_PIO_DRVSTR_ME (2 << 16)
#define ATMEL_PIO_DRVSTR_HI (3 << 16)
+#define ATMEL_PIO_DRVSTR_OFFSET 16
#define ATMEL_PIO_CFGR_EVTSEL_MASK GENMASK(26, 24)
#define ATMEL_PIO_CFGR_EVTSEL_FALLING (0 << 24)
#define ATMEL_PIO_CFGR_EVTSEL_RISING (1 << 24)
diff --git a/drivers/pinctrl/pinctrl-at91-pio4.c
b/drivers/pinctrl/pinctrl-at91-pio4.c
index 58f4d8cb39..350ea0a1f3 100644
--- a/drivers/pinctrl/pinctrl-at91-pio4.c
+++ b/drivers/pinctrl/pinctrl-at91-pio4.c
@@ -34,6 +34,7 @@ static const struct pinconf_param conf_params[] = {
{ "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 },
{ "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 },
{ "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE, 0 },
+ { "atmel,drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 },
};
static u32 atmel_pinctrl_get_pinconf(struct udevice *config)
@@ -41,6 +42,7 @@ static u32 atmel_pinctrl_get_pinconf(struct udevice *config)
const struct pinconf_param *params;
u32 param, arg, conf = 0;
u32 i;
+ u32 val;
for (i = 0; i < ARRAY_SIZE(conf_params); i++) {
params = &conf_params[i];
@@ -82,6 +84,12 @@ static u32 atmel_pinctrl_get_pinconf(struct udevice *config)
conf |= ATMEL_PIO_IFSCEN_MASK;
}
break;
+ case PIN_CONFIG_DRIVE_STRENGTH:
+ dev_read_u32(config, params->property, &val);
+ conf &= (~ATMEL_PIO_DRVSTR_MASK);
+ conf |= (val << ATMEL_PIO_DRVSTR_OFFSET)
+ & ATMEL_PIO_DRVSTR_MASK;
+ break;
default:
printf("%s: Unsupported configuration parameter: %u\n",
__func__, param);
diff --git a/include/dt-bindings/pinctrl/at91.h
b/include/dt-bindings/pinctrl/at91.h
index 5afb1863c3..3831f91fb3 100644
--- a/include/dt-bindings/pinctrl/at91.h
+++ b/include/dt-bindings/pinctrl/at91.h
@@ -42,4 +42,8 @@
#define AT91_PERIPH_C 3
#define AT91_PERIPH_D 4
+#define ATMEL_PIO_DRVSTR_LO 1
+#define ATMEL_PIO_DRVSTR_ME 2
+#define ATMEL_PIO_DRVSTR_HI 3
+
#endif /* __DT_BINDINGS_AT91_PINCTRL_H__ */
--
2.25.1
