[v1] Revert "spi: pxa2xx: Only claim CS GPIOs when the slave device is created"

Commit Message

Andy Shevchenko July 27, 2017, 10:09 a.m. UTC

There is a valid case to call setup() following by setup_cs() several
times for the same chip.

With the commit

	676a4e3bab44 ("spi: pxa2xx: Only claim CS GPIOs when the slave device is created")

it is not possible anymore due to GPIO line being requested already
during the first call to setup_cs().

For now, revert the commit to make things work again.

Signed-off-by: Andy Shevchenko <[e-mail]>
---
 drivers/spi/spi-pxa2xx.c | 59 +++++++++++++++++++++++++++++++-----------------
 1 file changed, 38 insertions(+), 21 deletions(-)

Comments

Mark Brown July 27, 2017, 10:15 a.m. UTC | #1

On Thu, Jul 27, 2017 at 01:09:54PM +0300, Andy Shevchenko wrote:
> There is a valid case to call setup() following by setup_cs() several
> times for the same chip.

Please submit patches using subject lines reflecting the style for the
subsystem.  This makes it easier for people to identify relevant
patches.  Look at what existing commits in the area you're changing are
doing and make sure your subject lines visually resemble what they're
doing.

Patch

diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index be991266a6ce..38d053682892 100644
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -1213,33 +1213,21 @@  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 device *pdev = &drv_data->pdev->dev;
-	struct gpio_desc *gpiod;
 	int err = 0;
-	int count;
 
 	if (chip == NULL)
 		return 0;
 
-	count = gpiod_count(pdev, "cs");
-	if (count > 0) {
-		if (spi->chip_select >= count)
-			return -EINVAL;
-
-		gpiod = gpiod_get_index(pdev, "cs", spi->chip_select,
-					GPIOD_OUT_HIGH);
-		if (IS_ERR(gpiod)) {
-			/* Means use native chip select */
-			if (PTR_ERR(gpiod) == -ENOENT)
-				return 0;
+	if (drv_data->cs_gpiods) {
+		struct gpio_desc *gpiod;
 
-			return PTR_ERR(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);
 		}
 
-		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;
 	}
 
@@ -1427,7 +1415,8 @@  static void cleanup(struct spi_device *spi)
 	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);
@@ -1763,10 +1752,38 @@  static int pxa2xx_spi_probe(struct platform_device *pdev)
 	master->num_chipselect = platform_info->num_chipselect;
 
 	count = gpiod_count(&pdev->dev, "cs");
-	if (count > 0)
+	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);