[PATCH] pinctrl: at91: add support for OUTPUT config
From: Wenyou Yang <hidden>
Date: 2016-10-28 07:54:10
Also in:
linux-gpio
Subsystem:
open firmware and flattened device tree bindings, pin control subsystem, pin controller - microchip at91, the rest · Maintainers:
Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Walleij, Ludovic Desroches, Linus Torvalds
From: Boris BREZILLON <redacted> 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 <redacted> Acked-by: Nicolas Ferre <redacted> Signed-off-by: Wenyou Yang <redacted> --- .../bindings/pinctrl/atmel,at91-pinctrl.txt | 2 ++ drivers/pinctrl/pinctrl-at91.c | 21 +++++++++++++++++++++ include/dt-bindings/pinctrl/at91.h | 2 ++ 3 files changed, 25 insertions(+)
diff --git a/Documentation/devicetree/bindings/pinctrl/atmel,at91-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/atmel,at91-pinctrl.txt
index b7a93e8..9a8a45d 100644
--- a/Documentation/devicetree/bindings/pinctrl/atmel,at91-pinctrl.txt
+++ b/Documentation/devicetree/bindings/pinctrl/atmel,at91-pinctrl.txt@@ -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.
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 @@ 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)
diff --git a/include/dt-bindings/pinctrl/at91.h b/include/dt-bindings/pinctrl/at91.h
index bbca3d0..2732d6c 100644
--- a/include/dt-bindings/pinctrl/at91.h
+++ b/include/dt-bindings/pinctrl/at91.h@@ -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)
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2.7.4