spi: pxa2xx: Add support for GPIO descriptor chip selects
The driver uses custom chip_info coming from platform data for chip selects
implemented as GPIOs. If the system lacks board files setting up the
platform data, it is not possible to use GPIOs as chip selects.
This adds support for GPIO descriptors so that regardless of the underlying
firmware interface (DT, ACPI or platform data) the driver can request GPIOs
used as chip selects and configure them accordingly.
The custom chip_info GPIO support is still left there to make sure the
existing systems keep working as expected.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index cab39b0..5e2ed7d 100644
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -1194,9 +1194,26 @@
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);
int err = 0;
- if (chip == NULL || chip_info == NULL)
+ 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->gpio_cs_inverted = spi->mode & SPI_CS_HIGH;
+ gpiod_set_value(gpiod, chip->gpio_cs_inverted);
+ }
+
+ return 0;
+ }
+
+ if (chip_info == NULL)
return 0;
/* NOTE: setup() can be called multiple times, possibly with
@@ -1379,7 +1396,8 @@
if (!chip)
return;
- if (drv_data->ssp_type != CE4100_SSP && gpio_is_valid(chip->gpio_cs))
+ if (drv_data->ssp_type != CE4100_SSP && !drv_data->cs_gpiods &&
+ gpio_is_valid(chip->gpio_cs))
gpio_free(chip->gpio_cs);
kfree(chip);
@@ -1557,7 +1575,7 @@
struct driver_data *drv_data;
struct ssp_device *ssp;
const struct lpss_config *config;
- int status;
+ int status, count;
u32 tmp;
platform_info = dev_get_platdata(dev);
@@ -1701,6 +1719,39 @@
}
master->num_chipselect = platform_info->num_chipselect;
+ count = gpiod_count(&pdev->dev, "cs");
+ if (count > 0) {
+ int i;
+
+ master->num_chipselect = max_t(int, count,
+ master->num_chipselect);
+
+ drv_data->cs_gpiods = devm_kcalloc(&pdev->dev,
+ master->num_chipselect, sizeof(struct gpio_desc *),
+ GFP_KERNEL);
+ if (!drv_data->cs_gpiods) {
+ status = -ENOMEM;
+ goto out_error_clock_enabled;
+ }
+
+ for (i = 0; i < master->num_chipselect; i++) {
+ struct gpio_desc *gpiod;
+
+ gpiod = devm_gpiod_get_index(dev, "cs", i,
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(gpiod)) {
+ /* Means use native chip select */
+ if (PTR_ERR(gpiod) == -ENOENT)
+ continue;
+
+ status = (int)PTR_ERR(gpiod);
+ goto out_error_clock_enabled;
+ } else {
+ drv_data->cs_gpiods[i] = gpiod;
+ }
+ }
+ }
+
tasklet_init(&drv_data->pump_transfers, pump_transfers,
(unsigned long)drv_data);