spi: ep93xx: Convert to use CS GPIO descriptors

This converts the EP93xx SPI master driver to use GPIO
descriptors for chip select handling.

EP93xx was using platform data to pass in GPIO lines,
by converting all board files to use GPIO descriptor
tables the core will look up the GPIO lines from the
SPI device in the same manner as for device tree.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 6 insertions, 26 deletions

diff --git a/drivers/spi/spi-ep93xx.c b/drivers/spi/spi-ep93xx.c
index 79fc3940245a..47e39251bad9 100644
--- a/drivers/spi/spi-ep93xx.c
+++ b/drivers/spi/spi-ep93xx.c
@@ -28,7 +28,6 @@
 #include <linux/platform_device.h>
 #include <linux/sched.h>
 #include <linux/scatterlist.h>
-#include <linux/gpio.h>
 #include <linux/spi/spi.h>
 
 #include <linux/platform_data/dma-ep93xx.h>
@@ -676,6 +675,7 @@ static int ep93xx_spi_probe(struct platform_device *pdev)
 	if (!master)
 		return -ENOMEM;
 
+	master->use_gpio_descriptors = true;
 	master->prepare_transfer_hardware = ep93xx_spi_prepare_hardware;
 	master->unprepare_transfer_hardware = ep93xx_spi_unprepare_hardware;
 	master->prepare_message = ep93xx_spi_prepare_message;
@@ -683,31 +683,11 @@ static int ep93xx_spi_probe(struct platform_device *pdev)
 	master->bus_num = pdev->id;
 	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
 	master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 16);
-
-	master->num_chipselect = info->num_chipselect;
-	master->cs_gpios = devm_kcalloc(&master->dev,
-					master->num_chipselect, sizeof(int),
-					GFP_KERNEL);
-	if (!master->cs_gpios) {
-		error = -ENOMEM;
-		goto fail_release_master;
-	}
-
-	for (i = 0; i < master->num_chipselect; i++) {
-		master->cs_gpios[i] = info->chipselect[i];
-
-		if (!gpio_is_valid(master->cs_gpios[i]))
-			continue;
-
-		error = devm_gpio_request_one(&pdev->dev, master->cs_gpios[i],
-					      GPIOF_OUT_INIT_HIGH,
-					      "ep93xx-spi");
-		if (error) {
-			dev_err(&pdev->dev, "could not request cs gpio %d\n",
-				master->cs_gpios[i]);
-			goto fail_release_master;
-		}
-	}
+	/*
+	 * The SPI core will count the number of GPIO descriptors to figure
+	 * out the number of chip selects available on the platform.
+	 */
+	master->num_chipselect = 0;
 
 	platform_set_drvdata(pdev, master);