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pinctrl: at91: add support for OUTPUT config 

Add support for pin output control through the pinctrl config:
 - support enabling/disabling output on a given pin
 - support output level setting (high or low)

Signed-off-by: Boris BREZILLON <b.brezillon@overkiz.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Boris BREZILLON 2016-10-28 15:54:10 +08:00 committed by Linus Walleij
parent e11dee2e98
commit 96bb12dead
3 changed files with 25 additions and 0 deletions
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2
Documentation/devicetree/bindings/pinctrl/atmel,at91-pinctrl.txt
View File

@ -98,6 +98,8 @@ DRIVE_STRENGTH (3 << 5): indicate the drive strength of the pin using the
01 - Low
10 - Medium
11 - High
OUTPUT (1 << 7): indicate this pin need to be configured as an output.
OUTPUT_VAL (1 << 8): output val (1 = high, 0 = low)
DEBOUNCE (1 << 16): indicate this pin needs debounce.
DEBOUNCE_VAL (0x3fff << 17): debounce value.

21
drivers/pinctrl/pinctrl-at91.c
View File

@ -56,6 +56,9 @@ static int gpio_banks;
#define DRIVE_STRENGTH_SHIFT 5
#define DRIVE_STRENGTH_MASK 0x3
#define DRIVE_STRENGTH (DRIVE_STRENGTH_MASK << DRIVE_STRENGTH_SHIFT)
#define OUTPUT (1 << 7)
#define OUTPUT_VAL_SHIFT 8
#define OUTPUT_VAL (0x1 << OUTPUT_VAL_SHIFT)
#define DEBOUNCE (1 << 16)
#define DEBOUNCE_VAL_SHIFT 17
#define DEBOUNCE_VAL (0x3fff << DEBOUNCE_VAL_SHIFT)
@ -375,6 +378,19 @@ static void at91_mux_set_pullup(void __iomem *pio, unsigned mask, bool on)
writel_relaxed(mask, pio + (on ? PIO_PUER : PIO_PUDR));
}
static bool at91_mux_get_output(void __iomem *pio, unsigned int pin, bool *val)
{
*val = (readl_relaxed(pio + PIO_ODSR) >> pin) & 0x1;
return (readl_relaxed(pio + PIO_OSR) >> pin) & 0x1;
}
static void at91_mux_set_output(void __iomem *pio, unsigned int mask,
bool is_on, bool val)
{
writel_relaxed(mask, pio + (val ? PIO_SODR : PIO_CODR));
writel_relaxed(mask, pio + (is_on ? PIO_OER : PIO_ODR));
}
static unsigned at91_mux_get_multidrive(void __iomem *pio, unsigned pin)
{
return (readl_relaxed(pio + PIO_MDSR) >> pin) & 0x1;
@ -848,6 +864,7 @@ static int at91_pinconf_get(struct pinctrl_dev *pctldev,
void __iomem *pio;
unsigned pin;
int div;
bool out;
*config = 0;
dev_dbg(info->dev, "%s:%d, pin_id=%d", __func__, __LINE__, pin_id);
@ -875,6 +892,8 @@ static int at91_pinconf_get(struct pinctrl_dev *pctldev,
if (info->ops->get_drivestrength)
*config |= (info->ops->get_drivestrength(pio, pin)
<< DRIVE_STRENGTH_SHIFT);
if (at91_mux_get_output(pio, pin, &out))
*config |= OUTPUT | (out << OUTPUT_VAL_SHIFT);
return 0;
}
@ -907,6 +926,8 @@ static int at91_pinconf_set(struct pinctrl_dev *pctldev,
if (config & PULL_UP && config & PULL_DOWN)
return -EINVAL;
at91_mux_set_output(pio, mask, config & OUTPUT,
(config & OUTPUT_VAL) >> OUTPUT_VAL_SHIFT);
at91_mux_set_pullup(pio, mask, config & PULL_UP);
at91_mux_set_multidrive(pio, mask, config & MULTI_DRIVE);
if (info->ops->set_deglitch)

2
include/dt-bindings/pinctrl/at91.h
View File

@ -15,6 +15,8 @@
#define AT91_PINCTRL_DEGLITCH (1 << 2)
#define AT91_PINCTRL_PULL_DOWN (1 << 3)
#define AT91_PINCTRL_DIS_SCHMIT (1 << 4)
#define AT91_PINCTRL_OUTPUT (1 << 7)
#define AT91_PINCTRL_OUTPUT_VAL(x) ((x & 0x1) << 8)
#define AT91_PINCTRL_DEBOUNCE (1 << 16)
#define AT91_PINCTRL_DEBOUNCE_VAL(x) (x << 17)