[PATCH RFC 1/2] spi: pxa2xx: Convert to GPIO descriptor API where possible

From: Jan Kiszka
Date: Thu Aug 03 2017 - 07:41:16 EST


From: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>

We still need to request/free GPIOs passed via the legacy path of
pxa2xx_spi_chip::gpio_cs, but we can use the gpiod API otherwise.

Consistently use the descriptor API instead of the legacy one.

Signed-off-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
---
drivers/spi/spi-pxa2xx.c | 32 ++++++++++++++++----------------
drivers/spi/spi-pxa2xx.h | 2 +-
2 files changed, 17 insertions(+), 17 deletions(-)

diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index 38d053682892..7faba738110c 100644
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -402,8 +402,8 @@ static void cs_assert(struct driver_data *drv_data)
return;
}

- if (gpio_is_valid(chip->gpio_cs)) {
- gpio_set_value(chip->gpio_cs, chip->gpio_cs_inverted);
+ if (chip->gpiod_cs) {
+ gpiod_set_value(chip->gpiod_cs, chip->gpio_cs_inverted);
return;
}

@@ -424,8 +424,8 @@ static void cs_deassert(struct driver_data *drv_data)
return;
}

- if (gpio_is_valid(chip->gpio_cs)) {
- gpio_set_value(chip->gpio_cs, !chip->gpio_cs_inverted);
+ if (chip->gpiod_cs) {
+ gpiod_set_value(chip->gpiod_cs, !chip->gpio_cs_inverted);
return;
}

@@ -1213,17 +1213,16 @@ static int setup_cs(struct spi_device *spi, struct chip_data *chip,
struct pxa2xx_spi_chip *chip_info)
{
struct driver_data *drv_data = spi_master_get_devdata(spi->master);
+ struct gpio_desc *gpiod;
int err = 0;

if (chip == NULL)
return 0;

if (drv_data->cs_gpiods) {
- struct gpio_desc *gpiod;
-
gpiod = drv_data->cs_gpiods[spi->chip_select];
if (gpiod) {
- chip->gpio_cs = desc_to_gpio(gpiod);
+ chip->gpiod_cs = gpiod;
chip->gpio_cs_inverted = spi->mode & SPI_CS_HIGH;
gpiod_set_value(gpiod, chip->gpio_cs_inverted);
}
@@ -1237,8 +1236,10 @@ static int setup_cs(struct spi_device *spi, struct chip_data *chip,
/* NOTE: setup() can be called multiple times, possibly with
* different chip_info, release previously requested GPIO
*/
- if (gpio_is_valid(chip->gpio_cs))
- gpio_free(chip->gpio_cs);
+ if (chip->gpiod_cs) {
+ gpio_free(desc_to_gpio(chip->gpiod_cs));
+ chip->gpiod_cs = NULL;
+ }

/* If (*cs_control) is provided, ignore GPIO chip select */
if (chip_info->cs_control) {
@@ -1254,11 +1255,11 @@ static int setup_cs(struct spi_device *spi, struct chip_data *chip,
return err;
}

- chip->gpio_cs = chip_info->gpio_cs;
+ gpiod = gpio_to_desc(chip_info->gpio_cs);
+ chip->gpiod_cs = gpiod;
chip->gpio_cs_inverted = spi->mode & SPI_CS_HIGH;

- err = gpio_direction_output(chip->gpio_cs,
- !chip->gpio_cs_inverted);
+ err = gpiod_direction_output(gpiod, !chip->gpio_cs_inverted);
}

return err;
@@ -1317,8 +1318,7 @@ static int setup(struct spi_device *spi)
}

chip->frm = spi->chip_select;
- } else
- chip->gpio_cs = -1;
+ }
chip->enable_dma = drv_data->master_info->enable_dma;
chip->timeout = TIMOUT_DFLT;
}
@@ -1416,8 +1416,8 @@ static void cleanup(struct spi_device *spi)
return;

if (drv_data->ssp_type != CE4100_SSP && !drv_data->cs_gpiods &&
- gpio_is_valid(chip->gpio_cs))
- gpio_free(chip->gpio_cs);
+ chip->gpiod_cs)
+ gpio_free(desc_to_gpio(chip->gpiod_cs));

kfree(chip);
}
diff --git a/drivers/spi/spi-pxa2xx.h b/drivers/spi/spi-pxa2xx.h
index 2823a00a9405..94f7b0713281 100644
--- a/drivers/spi/spi-pxa2xx.h
+++ b/drivers/spi/spi-pxa2xx.h
@@ -83,7 +83,7 @@ struct chip_data {
u16 lpss_tx_threshold;
u8 enable_dma;
union {
- int gpio_cs;
+ struct gpio_desc *gpiod_cs;
unsigned int frm;
};
int gpio_cs_inverted;
--
2.12.3