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pinctrl: at91-pio4: implement drive strength support

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Implement drive strength support, by preserving the same bindings
as in Linux.

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
This commit is contained in:
Eugen Hristev 2021-01-05 10:54:01 +02:00
parent 864a4144ba
commit 417eca09bf
3 changed files with 13 additions and 0 deletions
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1
arch/arm/mach-at91/include/mach/atmel_pio4.h
View File

@ -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)

8
drivers/pinctrl/pinctrl-at91-pio4.c
View File

@ -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);

4
include/dt-bindings/pinctrl/at91.h
View File

@ -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__ */