Re: [PATCH] pinctrl: at91: add support for OUTPUT config

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This was tested on sama5d31ek.

On 27/08/2013 16:51, Boris BREZILLON wrote:
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@xxxxxxxxxxx>
---
  .../bindings/pinctrl/atmel,at91-pinctrl.txt        |    2 ++
  drivers/pinctrl/pinctrl-at91.c                     |   22 ++++++++++++++++++++
  include/dt-bindings/pinctrl/at91.h                 |    2 ++
  3 files changed, 26 insertions(+)

diff --git a/Documentation/devicetree/bindings/pinctrl/atmel,at91-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/atmel,at91-pinctrl.txt
index cf7c7bc..5a22e0d 100644
--- a/Documentation/devicetree/bindings/pinctrl/atmel,at91-pinctrl.txt
+++ b/Documentation/devicetree/bindings/pinctrl/atmel,at91-pinctrl.txt
@@ -90,6 +90,8 @@ MULTIDRIVE	(1 << 1): indicate this pin need to be configured as multidrive.
  DEGLITCH	(1 << 2): indicate this pin need deglitch.
  PULL_DOWN	(1 << 3): indicate this pin need a pull down.
  DIS_SCHMIT	(1 << 4): indicate this pin need to disable schmit trigger.
+OUTPUT		(1 << 5): indicate this pin need to be configured as an output.
+OUTPUT_VAL	(0x1 << 6): output val (1 = high, 0 = low)
  DEBOUNCE	(1 << 16): indicate this pin need debounce.
  DEBOUNCE_VAL	(0x3fff << 17): debounce val.
diff --git a/drivers/pinctrl/pinctrl-at91.c b/drivers/pinctrl/pinctrl-at91.c
index 19afb9a..1578a0d 100644
--- a/drivers/pinctrl/pinctrl-at91.c
+++ b/drivers/pinctrl/pinctrl-at91.c
@@ -61,6 +61,9 @@ static int gpio_banks;
  #define DEGLITCH	(1 << 2)
  #define PULL_DOWN	(1 << 3)
  #define DIS_SCHMIT	(1 << 4)
+#define OUTPUT		(1 << 5)
+#define OUTPUT_VAL_SHIFT	6
+#define OUTPUT_VAL	(0x1 << OUTPUT_VAL_SHIFT)
  #define DEBOUNCE	(1 << 16)
  #define DEBOUNCE_VAL_SHIFT	17
  #define DEBOUNCE_VAL	(0x3fff << DEBOUNCE_VAL_SHIFT)
@@ -333,6 +336,19 @@ 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 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 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;
@@ -712,6 +728,7 @@ static int at91_pinconf_get(struct pinctrl_dev *pctldev,
  	void __iomem *pio;
  	unsigned pin;
  	int div;
+	bool out;
dev_dbg(info->dev, "%s:%d, pin_id=%d, config=0x%lx", __func__, __LINE__, pin_id, *config);
  	pio = pin_to_controller(info, pin_to_bank(pin_id));
@@ -732,6 +749,9 @@ static int at91_pinconf_get(struct pinctrl_dev *pctldev,
  	if (info->ops->get_schmitt_trig && info->ops->get_schmitt_trig(pio, pin))
  		*config |= DIS_SCHMIT;
+ if (at91_mux_get_output(pio, pin, &out))
+		*config |= OUTPUT | (out << OUTPUT_VAL_SHIFT);
+
  	return 0;
  }
@@ -749,6 +769,8 @@ 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 d7988b4..9fd4d48 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 << 5)
+#define AT91_PINCTRL_OUTPUT_VAL(x)	((x & 0x1) << 6)
  #define AT91_PINCTRL_DEBOUNCE		(1 << 16)
  #define AT91_PINCTRL_DEBOUNCE_VA(x)	(x << 17)

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