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Commit 7ebd7a3a authored by Jean-Christophe PLAGNIOL-VILLARD's avatar Jean-Christophe PLAGNIOL-VILLARD
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pinctrl: at91 add deglitch, debounce, pull down and schmitt trigger mux option support 



add :
 set_deglitch: enable/disable deglitch
 set_debounce: enable/disable debounce
 set_pulldown: enable/disable pulldown
 disable_schmitt_trig: disable schmitt trigger

Signed-off-by: default avatarJean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
parent 32b01a36

Documentation/devicetree/bindings/pinctrl/atmel,at91-pinctrl.txt

+7 −2
Original line number Diff line number Diff line
@@ -86,6 +86,11 @@ Required properties for pin configuration node: 
Bits used for CONFIG:

PULL_UP		(1 << 0): indicate this pin need a pull up.

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.

DEBOUNCE	(1 << 16): indicate this pin need debounce.

DEBOUNCE_VAL	(0x3fff << 17): debounce val.



NOTE:

Some requirements for using atmel,at91rm9200-pinctrl binding:

drivers/pinctrl/pinctrl-at91.c

+111 −0
Original line number Diff line number Diff line
@@ -59,6 +59,12 @@ static int gpio_banks; 


#define PULL_UP		(1 << 0)

#define MULTI_DRIVE	(1 << 1)

#define DEGLITCH	(1 << 2)

#define PULL_DOWN	(1 << 3)

#define DIS_SCHMIT	(1 << 4)

#define DEBOUNCE	(1 << 16)

#define DEBOUNCE_VAL_SHIFT	17

#define DEBOUNCE_VAL	(0x3fff << DEBOUNCE_VAL_SHIFT)



/**

 * struct at91_pmx_func - describes AT91 pinmux functions
@@ -122,6 +128,14 @@ struct at91_pin_group { 
 * @mux_B_periph: mux as periph B

 * @mux_C_periph: mux as periph C

 * @mux_D_periph: mux as periph D

 * @get_deglitch: get deglitch status

 * @set_deglitch: enable/disable deglitch

 * @get_debounce: get debounce status

 * @set_debounce: enable/disable debounce

 * @get_pulldown: get pulldown status

 * @set_pulldown: enable/disable pulldown

 * @get_schmitt_trig: get schmitt trigger status

 * @disable_schmitt_trig: disable schmitt trigger

 * @irq_type: return irq type

 */

struct at91_pinctrl_mux_ops {
@@ -130,6 +144,14 @@ struct at91_pinctrl_mux_ops { 
	void (*mux_B_periph)(void __iomem *pio, unsigned mask);

	void (*mux_C_periph)(void __iomem *pio, unsigned mask);

	void (*mux_D_periph)(void __iomem *pio, unsigned mask);

	bool (*get_deglitch)(void __iomem *pio, unsigned pin);

	void (*set_deglitch)(void __iomem *pio, unsigned mask, bool in_on);

	bool (*get_debounce)(void __iomem *pio, unsigned pin, u32 *div);

	void (*set_debounce)(void __iomem *pio, unsigned mask, bool in_on, u32 div);

	bool (*get_pulldown)(void __iomem *pio, unsigned pin);

	void (*set_pulldown)(void __iomem *pio, unsigned mask, bool in_on);

	bool (*get_schmitt_trig)(void __iomem *pio, unsigned pin);

	void (*disable_schmitt_trig)(void __iomem *pio, unsigned mask);

	/* irq */

	int (*irq_type)(struct irq_data *d, unsigned type);

};
@@ -386,10 +408,68 @@ static enum at91_mux at91_mux_get_periph(void __iomem *pio, unsigned mask) 
	return select + 1;

}



static bool at91_mux_get_deglitch(void __iomem *pio, unsigned pin)

{

	return (__raw_readl(pio + PIO_IFSR) >> pin) & 0x1;

}



static void at91_mux_set_deglitch(void __iomem *pio, unsigned mask, bool is_on)

{

	__raw_writel(mask, pio + (is_on ? PIO_IFER : PIO_IFDR));

}



static void at91_mux_pio3_set_deglitch(void __iomem *pio, unsigned mask, bool is_on)

{

	if (is_on)

		__raw_writel(mask, pio + PIO_IFSCDR);

	at91_mux_set_deglitch(pio, mask, is_on);

}



static bool at91_mux_pio3_get_debounce(void __iomem *pio, unsigned pin, u32 *div)

{

	*div = __raw_readl(pio + PIO_SCDR);



	return (__raw_readl(pio + PIO_IFSCSR) >> pin) & 0x1;

}



static void at91_mux_pio3_set_debounce(void __iomem *pio, unsigned mask,

				bool is_on, u32 div)

{

	if (is_on) {

		__raw_writel(mask, pio + PIO_IFSCER);

		__raw_writel(div & PIO_SCDR_DIV, pio + PIO_SCDR);

		__raw_writel(mask, pio + PIO_IFER);

	} else {

		__raw_writel(mask, pio + PIO_IFDR);

	}

}



static bool at91_mux_pio3_get_pulldown(void __iomem *pio, unsigned pin)

{

	return (__raw_readl(pio + PIO_PPDSR) >> pin) & 0x1;

}



static void at91_mux_pio3_set_pulldown(void __iomem *pio, unsigned mask, bool is_on)

{

	__raw_writel(mask, pio + (is_on ? PIO_PPDER : PIO_PPDDR));

}



static void at91_mux_pio3_disable_schmitt_trig(void __iomem *pio, unsigned mask)

{

	__raw_writel(__raw_readl(pio + PIO_SCHMITT) | mask, pio + PIO_SCHMITT);

}



static bool at91_mux_pio3_get_schmitt_trig(void __iomem *pio, unsigned pin)

{

	return (__raw_readl(pio + PIO_SCHMITT) >> pin) & 0x1;

}



static struct at91_pinctrl_mux_ops at91rm9200_ops = {

	.get_periph	= at91_mux_get_periph,

	.mux_A_periph	= at91_mux_set_A_periph,

	.mux_B_periph	= at91_mux_set_B_periph,

	.get_deglitch	= at91_mux_get_deglitch,

	.set_deglitch	= at91_mux_set_deglitch,

	.irq_type	= gpio_irq_type,

};
@@ -399,6 +479,14 @@ static struct at91_pinctrl_mux_ops at91sam9x5_ops = { 
	.mux_B_periph	= at91_mux_pio3_set_B_periph,

	.mux_C_periph	= at91_mux_pio3_set_C_periph,

	.mux_D_periph	= at91_mux_pio3_set_D_periph,

	.get_deglitch	= at91_mux_get_deglitch,

	.set_deglitch	= at91_mux_pio3_set_deglitch,

	.get_debounce	= at91_mux_pio3_get_debounce,

	.set_debounce	= at91_mux_pio3_set_debounce,

	.get_pulldown	= at91_mux_pio3_get_pulldown,

	.set_pulldown	= at91_mux_pio3_set_pulldown,

	.get_schmitt_trig = at91_mux_pio3_get_schmitt_trig,

	.disable_schmitt_trig = at91_mux_pio3_disable_schmitt_trig,

	.irq_type	= alt_gpio_irq_type,

};
@@ -624,6 +712,7 @@ static int at91_pinconf_get(struct pinctrl_dev *pctldev, 
	struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);

	void __iomem *pio;

	unsigned pin;

	int div;



	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));
@@ -635,6 +724,15 @@ static int at91_pinconf_get(struct pinctrl_dev *pctldev, 
	if (at91_mux_get_pullup(pio, pin))

		*config |= PULL_UP;



	if (info->ops->get_deglitch && info->ops->get_deglitch(pio, pin))

		*config |= DEGLITCH;

	if (info->ops->get_debounce && info->ops->get_debounce(pio, pin, &div))

		*config |= DEBOUNCE | (div << DEBOUNCE_VAL_SHIFT);

	if (info->ops->get_pulldown && info->ops->get_pulldown(pio, pin))

		*config |= PULL_DOWN;

	if (info->ops->get_schmitt_trig && info->ops->get_schmitt_trig(pio, pin))

		*config |= DIS_SCHMIT;



	return 0;

}
@@ -649,8 +747,21 @@ static int at91_pinconf_set(struct pinctrl_dev *pctldev, 
	pio = pin_to_controller(info, pin_to_bank(pin_id));

	mask = pin_to_mask(pin_id % MAX_NB_GPIO_PER_BANK);



	if (config & PULL_UP && config & PULL_DOWN)

		return -EINVAL;



	at91_mux_set_pullup(pio, mask, config & PULL_UP);

	at91_mux_set_multidrive(pio, mask, config & MULTI_DRIVE);

	if (info->ops->set_deglitch)

		info->ops->set_deglitch(pio, mask, config & DEGLITCH);

	if (info->ops->set_debounce)

		info->ops->set_debounce(pio, mask, config & DEBOUNCE,

				(config & DEBOUNCE_VAL) >> DEBOUNCE_VAL_SHIFT);

	if (info->ops->set_pulldown)

		info->ops->set_pulldown(pio, mask, config & PULL_DOWN);

	if (info->ops->disable_schmitt_trig && config & DIS_SCHMIT)

		info->ops->disable_schmitt_trig(pio, mask);



	return 0;

}