Unverified Commit 5211070c authored by Michael Hennerich's avatar Michael Hennerich Committed by Mark Brown
Browse files

spi: xcomm: add gpiochip support 



The hardware can expose one pin as a GPO. Hence, register a simple
gpiochip to support it.

Signed-off-by: default avatarMichael Hennerich <michael.hennerich@analog.com>
Co-developed-by: default avatarNuno Sa <nuno.sa@analog.com>
Signed-off-by: default avatarNuno Sa <nuno.sa@analog.com>
Link: https://patch.msgid.link/20240705-dev-spi-xcomm-gpiochip-v2-1-b10842fc9636@analog.com


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 6c387fb2

drivers/spi/spi-xcomm.c

+41 −1
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ 
#include <linux/module.h>

#include <linux/delay.h>

#include <linux/i2c.h>

#include <linux/gpio/driver.h>

#include <linux/spi/spi.h>

#include <asm/unaligned.h>
@@ -26,12 +27,15 @@ 


#define SPI_XCOMM_CMD_UPDATE_CONFIG	0x03

#define SPI_XCOMM_CMD_WRITE		0x04

#define SPI_XCOMM_CMD_GPIO_SET		0x05



#define SPI_XCOMM_CLOCK 48000000



struct spi_xcomm {

	struct i2c_client *i2c;



	struct gpio_chip gc;



	uint16_t settings;

	uint16_t chipselect;
@@ -40,6 +44,42 @@ struct spi_xcomm { 
	uint8_t buf[63];

};



static void spi_xcomm_gpio_set_value(struct gpio_chip *chip,

				     unsigned int offset, int val)

{

	struct spi_xcomm *spi_xcomm = gpiochip_get_data(chip);

	unsigned char buf[2];



	buf[0] = SPI_XCOMM_CMD_GPIO_SET;

	buf[1] = !!val;



	i2c_master_send(spi_xcomm->i2c, buf, 2);

}



static int spi_xcomm_gpio_get_direction(struct gpio_chip *chip,

					unsigned int offset)

{

	return GPIO_LINE_DIRECTION_OUT;

}



static int spi_xcomm_gpio_add(struct spi_xcomm *spi_xcomm)

{

	struct device *dev = &spi_xcomm->i2c->dev;



	if (!IS_ENABLED(CONFIG_GPIOLIB))

		return 0;



	spi_xcomm->gc.get_direction = spi_xcomm_gpio_get_direction;

	spi_xcomm->gc.set = spi_xcomm_gpio_set_value;

	spi_xcomm->gc.can_sleep = 1;

	spi_xcomm->gc.base = -1;

	spi_xcomm->gc.ngpio = 1;

	spi_xcomm->gc.label = spi_xcomm->i2c->name;

	spi_xcomm->gc.owner = THIS_MODULE;



	return devm_gpiochip_add_data(dev, &spi_xcomm->gc, spi_xcomm);

}



static int spi_xcomm_sync_config(struct spi_xcomm *spi_xcomm, unsigned int len)

{

	uint16_t settings;
@@ -227,7 +267,7 @@ static int spi_xcomm_probe(struct i2c_client *i2c) 
	if (ret < 0)

		spi_controller_put(host);



	return ret;

	return spi_xcomm_gpio_add(spi_xcomm);

}



static const struct i2c_device_id spi_xcomm_ids[] = {