[PATCH 2/2] spi: mpc512x-psc: Convert to use GPIO descriptors

[Linus Walleij <linus.walleij@xxxxxxxxxx>]

This driver is already relying on the core to provide
valid GPIO numbers in spi->cs_gpio through
of_spi_get_gpio_numbers(), so we can switch to letting
the core use GPIO descriptors instead.

Make sure that the .set_cs() is always called, as some controller
set-up is also needed.

Cc: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
Cc: Anatolij Gustschin <agust@xxxxxxx>
Cc: linuxppc-dev@xxxxxxxxxxxxxxxx
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
---
 drivers/spi/spi-mpc512x-psc.c | 33 +++++++--------------------------
 1 file changed, 7 insertions(+), 26 deletions(-)

diff --git a/drivers/spi/spi-mpc512x-psc.c b/drivers/spi/spi-mpc512x-psc.c
index 35313a77f977..dd8bba408301 100644
--- a/drivers/spi/spi-mpc512x-psc.c
+++ b/drivers/spi/spi-mpc512x-psc.c
@@ -23,7 +23,6 @@
 #include <linux/clk.h>
 #include <linux/spi/spi.h>
 #include <linux/fsl_devices.h>
-#include <linux/gpio.h>
 #include <asm/mpc52xx_psc.h>
 
 enum {
@@ -99,7 +98,7 @@ static void mpc512x_psc_spi_set_cs(struct spi_device *spi, bool enable)
 	u16 bclkdiv;
 
 	if (!enable) {
-		if (mps->cs_control && gpio_is_valid(spi->cs_gpio))
+		if (mps->cs_control && spi->cs_gpiod)
 			mps->cs_control(spi, (spi->mode & SPI_CS_HIGH) ? 0 : 1);
 		return;
 	}
@@ -134,7 +133,7 @@ static void mpc512x_psc_spi_set_cs(struct spi_device *spi, bool enable)
 	out_be32(psc_addr(mps, ccr), ccr);
 	mps->bits_per_word = cs->bits_per_word;
 
-	if (mps->cs_control && gpio_is_valid(spi->cs_gpio))
+	if (mps->cs_control && spi->cs_gpiod)
 		mps->cs_control(spi, (spi->mode & SPI_CS_HIGH) ? 1 : 0);
 }
 
@@ -358,18 +357,6 @@ static int mpc512x_psc_spi_setup(struct spi_device *spi)
 		if (!cs)
 			return -ENOMEM;
 
-		if (gpio_is_valid(spi->cs_gpio)) {
-			ret = gpio_request(spi->cs_gpio, dev_name(&spi->dev));
-			if (ret) {
-				dev_err(&spi->dev, "can't get CS gpio: %d\n",
-					ret);
-				kfree(cs);
-				return ret;
-			}
-			gpio_direction_output(spi->cs_gpio,
-					spi->mode & SPI_CS_HIGH ? 0 : 1);
-		}
-
 		spi->controller_state = cs;
 	}
 
@@ -381,8 +368,6 @@ static int mpc512x_psc_spi_setup(struct spi_device *spi)
 
 static void mpc512x_psc_spi_cleanup(struct spi_device *spi)
 {
-	if (gpio_is_valid(spi->cs_gpio))
-		gpio_free(spi->cs_gpio);
 	kfree(spi->controller_state);
 }
 
@@ -461,11 +446,6 @@ static irqreturn_t mpc512x_psc_spi_isr(int irq, void *dev_id)
 	return IRQ_NONE;
 }
 
-static void mpc512x_spi_cs_control(struct spi_device *spi, bool onoff)
-{
-	gpio_set_value(spi->cs_gpio, onoff);
-}
-
 static int mpc512x_psc_spi_do_probe(struct device *dev, u32 regaddr,
 					      u32 size, unsigned int irq)
 {
@@ -485,10 +465,8 @@ static int mpc512x_psc_spi_do_probe(struct device *dev, u32 regaddr,
 	mps->type = (int)of_device_get_match_data(dev);
 	mps->irq = irq;
 
-	if (pdata == NULL) {
-		mps->cs_control = mpc512x_spi_cs_control;
-	} else {
-		mps->cs_control = pdata->cs_control;
+	if (pdata) {
+		mps->cs_control = pdata->cs_control;x
 		master->bus_num = pdata->bus_num;
 		master->num_chipselect = pdata->max_chipselect;
 	}
@@ -499,6 +477,9 @@ static int mpc512x_psc_spi_do_probe(struct device *dev, u32 regaddr,
 	master->transfer_one_message = mpc512x_psc_spi_msg_xfer;
 	master->unprepare_transfer_hardware = mpc512x_psc_spi_unprep_xfer_hw;
 	master->set_cs = mpc512x_psc_spi_set_cs;
+	/* This makes sure our custom .set_cs() is always called */
+	master->flags = SPI_MASTER_GPIO_SS;
+	master->use_gpio_descriptors = true;
 	master->cleanup = mpc512x_psc_spi_cleanup;
 	master->dev.of_node = dev->of_node;
 
-- 
2.26.2