[PATCH 2/6] spi: dw: Convert to use CS GPIO descriptors

[Ike Panhc]

From: Linus Walleij <linus.walleij at linaro.org>

BugLink: https://bugs.launchpad.net/bugs/1826142

This converts the DesignWare (dw) SPI master driver to
use GPIO descriptors for chip select handling.

This driver has a duplicate DT parser in addition to the
one in the core, sets up the line as non-asserted and
relies on the core to drive the GPIOs.

It is a pretty straight-forward conversion.

Cc: Talel Shenhar <talel at amazon.com>
Cc: Simon Goldschmidt <simon.k.r.goldschmidt at gmail.com>
Cc: Alexandre Belloni <alexandre.belloni at bootlin.com>
Cc: Linuxarm <linuxarm at huawei.com>
Tested-by: Jay Fang <f.fangjian at huawei.com>
Reviewed-by: Alexandre Belloni <alexandre.belloni at bootlin.com>
Signed-off-by: Linus Walleij <linus.walleij at linaro.org>
Signed-off-by: Mark Brown <broonie at kernel.org>
(cherry picked from commit 9400c41e77b8f1f9c711b08a6c79bdbc5681fb00)
Signed-off-by: Ike Panhc <ike.pan at canonical.com>
---
 drivers/spi/spi-dw-mmio.c | 22 ----------------------
 drivers/spi/spi-dw.c      |  9 +--------
 2 files changed, 1 insertion(+), 30 deletions(-)

diff --git a/drivers/spi/spi-dw-mmio.c b/drivers/spi/spi-dw-mmio.c
index d0dd7814e997..4bd59a93d988 100644
--- a/drivers/spi/spi-dw-mmio.c
+++ b/drivers/spi/spi-dw-mmio.c
@@ -18,7 +18,6 @@
 #include <linux/mfd/syscon.h>
 #include <linux/module.h>
 #include <linux/of.h>
-#include <linux/of_gpio.h>
 #include <linux/of_platform.h>
 #include <linux/acpi.h>
 #include <linux/property.h>
@@ -185,27 +184,6 @@ static int dw_spi_mmio_probe(struct platform_device *pdev)
 
 	dws->num_cs = num_cs;
 
-	if (pdev->dev.of_node) {
-		int i;
-
-		for (i = 0; i < dws->num_cs; i++) {
-			int cs_gpio = of_get_named_gpio(pdev->dev.of_node,
-					"cs-gpios", i);
-
-			if (cs_gpio == -EPROBE_DEFER) {
-				ret = cs_gpio;
-				goto out;
-			}
-
-			if (gpio_is_valid(cs_gpio)) {
-				ret = devm_gpio_request(&pdev->dev, cs_gpio,
-						dev_name(&pdev->dev));
-				if (ret)
-					goto out;
-			}
-		}
-	}
-
 	init_func = device_get_match_data(&pdev->dev);
 	if (init_func) {
 		ret = init_func(pdev, dwsmmio);
diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c
index 2e822a56576a..531f6ce5900d 100644
--- a/drivers/spi/spi-dw.c
+++ b/drivers/spi/spi-dw.c
@@ -20,7 +20,6 @@
 #include <linux/delay.h>
 #include <linux/slab.h>
 #include <linux/spi/spi.h>
-#include <linux/gpio.h>
 
 #include "spi-dw.h"
 
@@ -425,13 +424,6 @@ static int dw_spi_setup(struct spi_device *spi)
 
 	chip->tmode = SPI_TMOD_TR;
 
-	if (gpio_is_valid(spi->cs_gpio)) {
-		ret = gpio_direction_output(spi->cs_gpio,
-				!(spi->mode & SPI_CS_HIGH));
-		if (ret)
-			return ret;
-	}
-
 	return 0;
 }
 
@@ -496,6 +488,7 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws)
 		goto err_free_master;
 	}
 
+	master->use_gpio_descriptors = true;
 	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LOOP;
 	master->bits_per_word_mask =  SPI_BPW_RANGE_MASK(4, 16);
 	master->bus_num = dws->bus_num;
-- 
2.17.1