ata: ahci-imx: Covert to use GPIO descriptor

This converts the i.MX AHCI driver to use a GPIO descriptor
instead of parsing the device tree by itself.

This driver is quite obviously device tree only, and the
GPIO line is treated as optional, so let's keep it as
optional.

None of the device trees in the kernel use this GPIO
facility today, so it is hard to test.

Cc: Egor Starkov <egor.starkov@ge.com>
Cc: Richard Zhu <hongxing.zhu@nxp.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/ata/ahci_imx.c b/drivers/ata/ahci_imx.c
index bfc617cc8ac5987b1a800653f61fcda99680391f..948d2c6557f38fad333ab0e6e64972944fa9eb67 100644 (file)
--- a/drivers/ata/ahci_imx.c
+++ b/drivers/ata/ahci_imx.c
@@ -11,8 +11,8 @@
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
 #include <linux/ahci_platform.h>
+#include <linux/gpio/consumer.h>
 #include <linux/of_device.h>
-#include <linux/of_gpio.h>
 #include <linux/mfd/syscon.h>
 #include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
 #include <linux/libata.h>
@@ -100,7 +100,7 @@ struct imx_ahci_priv {
        struct clk *phy_pclk0;
        struct clk *phy_pclk1;
        void __iomem *phy_base;
-       int clkreq_gpio;
+       struct gpio_desc *clkreq_gpiod;
        struct regmap *gpr;
        bool no_device;
        bool first_time;
@@ -980,7 +980,6 @@ static struct scsi_host_template ahci_platform_sht = {
 
 static int imx8_sata_probe(struct device *dev, struct imx_ahci_priv *imxpriv)
 {
-       int ret;
        struct resource *phy_res;
        struct platform_device *pdev = imxpriv->ahci_pdev;
        struct device_node *np = dev->of_node;
@@ -1033,20 +1032,12 @@ static int imx8_sata_probe(struct device *dev, struct imx_ahci_priv *imxpriv)
        }
 
        /* Fetch GPIO, then enable the external OSC */
-       imxpriv->clkreq_gpio = of_get_named_gpio(np, "clkreq-gpio", 0);
-       if (gpio_is_valid(imxpriv->clkreq_gpio)) {
-               ret = devm_gpio_request_one(dev, imxpriv->clkreq_gpio,
-                                           GPIOF_OUT_INIT_LOW,
-                                           "SATA CLKREQ");
-               if (ret == -EBUSY) {
-                       dev_info(dev, "clkreq had been initialized.\n");
-               } else if (ret) {
-                       dev_err(dev, "%d unable to get clkreq.\n", ret);
-                       return ret;
-               }
-       } else if (imxpriv->clkreq_gpio == -EPROBE_DEFER) {
-               return imxpriv->clkreq_gpio;
-       }
+       imxpriv->clkreq_gpiod = devm_gpiod_get_optional(dev, "clkreq",
+                               GPIOD_OUT_LOW | GPIOD_FLAGS_BIT_NONEXCLUSIVE);
+       if (IS_ERR(imxpriv->clkreq_gpiod))
+               return PTR_ERR(imxpriv->clkreq_gpiod);
+       if (imxpriv->clkreq_gpiod)
+               gpiod_set_consumer_name(imxpriv->clkreq_gpiod, "SATA CLKREQ");
 
        return 0;
 }