spi: pl022: Convert to use GPIO descriptors

This converts the PL022 driver to use GPIO descriptors
instead of the old global GPIO numberspace. Since the
driver handles messages on its own it needs to manage
the GPIO descriptor directly.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20210330164907.2346010-3-linus.walleij@linaro.orgSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-pl022.c

@@ -31,7 +31,6 @@
 #include <linux/dma-mapping.h>
 #include <linux/scatterlist.h>
 #include <linux/pm_runtime.h>
-#include <linux/gpio.h>
 #include <linux/of.h>
 #include <linux/pinctrl/consumer.h>
 
@@ -363,7 +362,7 @@ struct vendor_data {
  * @dummypage: a dummy page used for driving data on the bus with DMA
  * @dma_running: indicates whether DMA is in operation
  * @cur_cs: current chip select index
- * @cur_gpio: current chip select GPIO line
+ * @cur_gpiod: current chip select GPIO descriptor
  */
 struct pl022 {
 	struct amba_device		*adev;
@@ -398,7 +397,7 @@ struct pl022 {
 	bool				dma_running;
 #endif
 	int cur_cs;
-	int cur_gpio;
+	struct gpio_desc *cur_gpiod;
 };
 
 /**
@@ -454,8 +453,16 @@ static void pl022_cs_control(struct pl022 *pl022, u32 command)
 {
 	if (pl022->vendor->internal_cs_ctrl)
 		internal_cs_control(pl022, command);
-	else if (gpio_is_valid(pl022->cur_gpio))
-		gpio_set_value(pl022->cur_gpio, command);
+	else if (pl022->cur_gpiod)
+		/*
+		 * This needs to be inverted since with GPIOLIB in
+		 * control, the inversion will be handled by
+		 * GPIOLIB's active low handling. The "command"
+		 * passed into this function will be SSP_CHIP_SELECT
+		 * which is enum:ed to 0, so we need the inverse
+		 * (1) to activate chip select.
+		 */
+		gpiod_set_value(pl022->cur_gpiod, !command);
 }
 
 /**
@@ -1582,7 +1589,7 @@ static int pl022_transfer_one_message(struct spi_master *master,
 	pl022->cur_chip = spi_get_ctldata(msg->spi);
 	pl022->cur_cs = msg->spi->chip_select;
 	/* This is always available but may be set to -ENOENT */
-	pl022->cur_gpio = msg->spi->cs_gpio;
+	pl022->cur_gpiod = msg->spi->cs_gpiod;
 
 	restore_state(pl022);
 	flush(pl022);
@@ -2135,6 +2142,7 @@ static int pl022_probe(struct amba_device *adev, const struct amba_id *id)
 	master->unprepare_transfer_hardware = pl022_unprepare_transfer_hardware;
 	master->rt = platform_info->rt;
 	master->dev.of_node = dev->of_node;
+	master->use_gpio_descriptors = true;
 
 	/*
 	 * Supports mode 0-3, loopback, and active low CS. Transfers are