Commit c4582907 authored by Uwe Kleine-König's avatar Uwe Kleine-König Committed by Linus Walleij
Browse files

pinctrl: mcp23s08: Implement gpio bulk functions 



To speed up some usecases implement reading and writing several IO lines
at once.

Signed-off-by: default avatarUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20230324164957.485924-3-u.kleine-koenig@pengutronix.de


Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent d490be6d

drivers/pinctrl/pinctrl-mcp23s08.c

+34 −0
Original line number Diff line number Diff line
@@ -307,6 +307,28 @@ static int mcp23s08_get(struct gpio_chip *chip, unsigned offset) 
	return status;

}



static int mcp23s08_get_multiple(struct gpio_chip *chip,

				 unsigned long *mask, unsigned long *bits)

{

	struct mcp23s08 *mcp = gpiochip_get_data(chip);

	unsigned int status;

	int ret;



	mutex_lock(&mcp->lock);



	/* REVISIT reading this clears any IRQ ... */

	ret = mcp_read(mcp, MCP_GPIO, &status);

	if (ret < 0)

		status = 0;

	else {

		mcp->cached_gpio = status;

		*bits = status;

	}



	mutex_unlock(&mcp->lock);

	return ret;

}



static int __mcp23s08_set(struct mcp23s08 *mcp, unsigned mask, bool value)

{

	return mcp_update_bits(mcp, MCP_OLAT, mask, value ? mask : 0);
@@ -322,6 +344,16 @@ static void mcp23s08_set(struct gpio_chip *chip, unsigned offset, int value) 
	mutex_unlock(&mcp->lock);

}



static void mcp23s08_set_multiple(struct gpio_chip *chip,

				  unsigned long *mask, unsigned long *bits)

{

	struct mcp23s08	*mcp = gpiochip_get_data(chip);



	mutex_lock(&mcp->lock);

	mcp_update_bits(mcp, MCP_OLAT, *mask, *bits);

	mutex_unlock(&mcp->lock);

}



static int

mcp23s08_direction_output(struct gpio_chip *chip, unsigned offset, int value)

{
@@ -546,8 +578,10 @@ int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev, 


	mcp->chip.direction_input = mcp23s08_direction_input;

	mcp->chip.get = mcp23s08_get;

	mcp->chip.get_multiple = mcp23s08_get_multiple;

	mcp->chip.direction_output = mcp23s08_direction_output;

	mcp->chip.set = mcp23s08_set;

	mcp->chip.set_multiple = mcp23s08_set_multiple;



	mcp->chip.base = base;

	mcp->chip.can_sleep = true;