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>
diff --git a/drivers/pinctrl/pinctrl-at91.c b/drivers/pinctrl/pinctrl-at91.c
index 9f09041..569bc28 100644
--- a/drivers/pinctrl/pinctrl-at91.c
+++ b/drivers/pinctrl/pinctrl-at91.c
@@ -56,6 +56,9 @@
#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 @@
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 @@
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 @@
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 @@
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)