remoteproc/keystone: Switch to using gpiod API

This patch switches the driver away from legacy gpio/of_gpio API to
gpiod API, and removes use of of_get_named_gpio_flags() which I want to
make private to gpiolib.

Note that there is a behavior change in the driver: previously the
driver did not actually request GPIO, it simply parsed GPIO number out
of device tree and poked at it.
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/Yxe20ehiOnitDGus@google.comSigned-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>

drivers/remoteproc/keystone_remoteproc.c

@@ -14,7 +14,7 @@
 #include <linux/workqueue.h>
 #include <linux/of_address.h>
 #include <linux/of_reserved_mem.h>
-#include <linux/of_gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/regmap.h>
 #include <linux/mfd/syscon.h>
 #include <linux/remoteproc.h>
@@ -59,10 +59,10 @@ struct keystone_rproc {
 	int num_mems;
 	struct regmap *dev_ctrl;
 	struct reset_control *reset;
+	struct gpio_desc *kick_gpio;
 	u32 boot_offset;
 	int irq_ring;
 	int irq_fault;
-	int kick_gpio;
 	struct work_struct workqueue;
 };
 
@@ -232,10 +232,10 @@ static void keystone_rproc_kick(struct rproc *rproc, int vqid)
 {
 	struct keystone_rproc *ksproc = rproc->priv;
 
-	if (WARN_ON(ksproc->kick_gpio < 0))
+	if (!ksproc->kick_gpio)
 		return;
 
-	gpio_set_value(ksproc->kick_gpio, 1);
+	gpiod_set_value(ksproc->kick_gpio, 1);
 }
 
 /*
@@ -432,9 +432,9 @@ static int keystone_rproc_probe(struct platform_device *pdev)
 		goto disable_clk;
 	}
 
-	ksproc->kick_gpio = of_get_named_gpio_flags(np, "kick-gpios", 0, NULL);
-	if (ksproc->kick_gpio < 0) {
-		ret = ksproc->kick_gpio;
+	ksproc->kick_gpio = gpiod_get(dev, "kick", GPIOD_ASIS);
+	ret = PTR_ERR_OR_ZERO(ksproc->kick_gpio);
+	if (ret) {
 		dev_err(dev, "failed to get gpio for virtio kicks, status = %d\n",
 			ret);
 		goto disable_clk;
@@ -466,6 +466,7 @@ static int keystone_rproc_probe(struct platform_device *pdev)
 
 release_mem:
 	of_reserved_mem_device_release(dev);
+	gpiod_put(ksproc->kick_gpio);
 disable_clk:
 	pm_runtime_put_sync(dev);
 disable_rpm:
@@ -480,6 +481,7 @@ static int keystone_rproc_remove(struct platform_device *pdev)
 	struct keystone_rproc *ksproc = platform_get_drvdata(pdev);
 
 	rproc_del(ksproc->rproc);
+	gpiod_put(ksproc->kick_gpio);
 	pm_runtime_put_sync(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
 	rproc_free(ksproc->rproc);