V4L/DVB (7218): Fix breakage in mt9m001 and mt9v022 driver if "CONFIG_GENERIC_GPIO is not set"

Both camera drivers can function without GPIO support, in which case they
will only support the 10 bit data width mode. But the two respective switch
have to depend on CONFIG_GENERIC_GPIO. Additionally remove redundant
gpio_is_valid tests - they are repeated in bus_switch_request() functions.
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@pengutronix.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/Kconfig

@@ -847,7 +847,7 @@ config SOC_CAMERA
 
 config SOC_CAMERA_MT9M001
 	tristate "mt9m001 support"
-	depends on SOC_CAMERA && GENERIC_GPIO
+	depends on SOC_CAMERA
 	select GPIO_PCA953X if MT9M001_PCA9536_SWITCH
 	help
 	  This driver supports MT9M001 cameras from Micron, monochrome
@@ -855,21 +855,21 @@ config SOC_CAMERA_MT9M001
 
 config MT9M001_PCA9536_SWITCH
 	bool "pca9536 datawidth switch for mt9m001"
-	depends on SOC_CAMERA_MT9M001
+	depends on SOC_CAMERA_MT9M001 && GENERIC_GPIO
 	help
 	  Select this if your MT9M001 camera uses a PCA9536 I2C GPIO
 	  extender to switch between 8 and 10 bit datawidth modes
 
 config SOC_CAMERA_MT9V022
 	tristate "mt9v022 support"
-	depends on SOC_CAMERA && GENERIC_GPIO
+	depends on SOC_CAMERA
 	select GPIO_PCA953X if MT9V022_PCA9536_SWITCH
 	help
 	  This driver supports MT9V022 cameras from Micron
 
 config MT9V022_PCA9536_SWITCH
 	bool "pca9536 datawidth switch for mt9v022"
-	depends on SOC_CAMERA_MT9V022
+	depends on SOC_CAMERA_MT9V022 && GENERIC_GPIO
 	help
 	  Select this if your MT9V022 camera uses a PCA9536 I2C GPIO
 	  extender to switch between 8 and 10 bit datawidth modes

drivers/media/video/mt9m001.c

@@ -17,7 +17,9 @@
 #include <media/v4l2-chip-ident.h>
 #include <media/soc_camera.h>
 
+#ifdef CONFIG_MT9M001_PCA9536_SWITCH
 #include <asm/gpio.h>
+#endif
 
 /* mt9m001 i2c address 0x5d
  * The platform has to define i2c_board_info
@@ -223,10 +225,6 @@ static int mt9m001_set_capture_format(struct soc_camera_device *icd,
 	if ((mt9m001->datawidth != 10 && (width_flag == IS_DATAWIDTH_10)) ||
 	    (mt9m001->datawidth != 9  && (width_flag == IS_DATAWIDTH_9)) ||
 	    (mt9m001->datawidth != 8  && (width_flag == IS_DATAWIDTH_8))) {
-		/* data width switch requested */
-		if (!gpio_is_valid(mt9m001->switch_gpio))
-			return -EINVAL;
-
 		/* Well, we actually only can do 10 or 8 bits... */
 		if (width_flag == IS_DATAWIDTH_9)
 			return -EINVAL;

drivers/media/video/mt9v022.c

@@ -18,7 +18,9 @@
 #include <media/v4l2-chip-ident.h>
 #include <media/soc_camera.h>
 
+#ifdef CONFIG_MT9M001_PCA9536_SWITCH
 #include <asm/gpio.h>
+#endif
 
 /* mt9v022 i2c address 0x48, 0x4c, 0x58, 0x5c
  * The platform has to define i2c_board_info
@@ -302,10 +304,6 @@ static int mt9v022_set_capture_format(struct soc_camera_device *icd,
 	if ((mt9v022->datawidth != 10 && (width_flag == IS_DATAWIDTH_10)) ||
 	    (mt9v022->datawidth != 9  && (width_flag == IS_DATAWIDTH_9)) ||
 	    (mt9v022->datawidth != 8  && (width_flag == IS_DATAWIDTH_8))) {
-		/* data width switch requested */
-		if (!gpio_is_valid(mt9v022->switch_gpio))
-			return -EINVAL;
-
 		/* Well, we actually only can do 10 or 8 bits... */
 		if (width_flag == IS_DATAWIDTH_9)
 			return -EINVAL;