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spi: xcomm: add gpiochip support

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

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Co-developed-by: Nuno Sa <nuno.sa@analog.com>
Signed-off-by: Nuno Sa <nuno.sa@analog.com>
Link: https://patch.msgid.link/20240705-dev-spi-xcomm-gpiochip-v2-1-b10842fc9636@analog.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Michael Hennerich 2024-07-05 17:12:39 +02:00 committed by Mark Brown
parent 6c387fb263
commit 5211070c33
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GPG Key ID: 24D68B725D5487D0
1 changed files with 41 additions and 1 deletions
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42
drivers/spi/spi-xcomm.c
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@ -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[] = {