linux-kernel - [PATCH 01/12] backlight: gpio: allow to probe non-pdata devices from board files

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Date:   Tue, 25 Jun 2019 18:34:23 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Sekhar Nori <nsekhar@...com>, Kevin Hilman <khilman@...nel.org>,
        Lee Jones <lee.jones@...aro.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Jingoo Han <jingoohan1@...il.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        David Lechner <david@...hnology.com>,
        Linus Walleij <linus.walleij@...aro.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: [PATCH 01/12] backlight: gpio: allow to probe non-pdata devices from board files

From: Bartosz Golaszewski <bgolaszewski@...libre.com>

Currently we can only probe devices that either use device tree or pass
platform data to probe(). Rename gpio_backlight_probe_dt() to
gpio_backlight_probe_prop() and use generic device properties instead
of OF specific helpers. Reverse the logic checking the presence of
platform data in probe(). This way we can probe devices() registered
from machine code that neither have a DT node nor use platform data.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
---
 drivers/video/backlight/gpio_backlight.c | 24 ++++++++----------------
 1 file changed, 8 insertions(+), 16 deletions(-)

diff --git a/drivers/video/backlight/gpio_backlight.c b/drivers/video/backlight/gpio_backlight.c
index b9300f3e1ee6..654c19d3a81d 100644
--- a/drivers/video/backlight/gpio_backlight.c
+++ b/drivers/video/backlight/gpio_backlight.c
@@ -54,15 +54,14 @@ static const struct backlight_ops gpio_backlight_ops = {
 	.check_fb	= gpio_backlight_check_fb,
 };
 
-static int gpio_backlight_probe_dt(struct platform_device *pdev,
-				   struct gpio_backlight *gbl)
+static int gpio_backlight_probe_prop(struct platform_device *pdev,
+				     struct gpio_backlight *gbl)
 {
 	struct device *dev = &pdev->dev;
-	struct device_node *np = dev->of_node;
 	enum gpiod_flags flags;
 	int ret;
 
-	gbl->def_value = of_property_read_bool(np, "default-on");
+	gbl->def_value = device_property_read_bool(dev, "default-on");
 	flags = gbl->def_value ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
 
 	gbl->gpiod = devm_gpiod_get(dev, NULL, flags);
@@ -86,26 +85,15 @@ static int gpio_backlight_probe(struct platform_device *pdev)
 	struct backlight_properties props;
 	struct backlight_device *bl;
 	struct gpio_backlight *gbl;
-	struct device_node *np = pdev->dev.of_node;
 	int ret;
 
-	if (!pdata && !np) {
-		dev_err(&pdev->dev,
-			"failed to find platform data or device tree node.\n");
-		return -ENODEV;
-	}
-
 	gbl = devm_kzalloc(&pdev->dev, sizeof(*gbl), GFP_KERNEL);
 	if (gbl == NULL)
 		return -ENOMEM;
 
 	gbl->dev = &pdev->dev;
 
-	if (np) {
-		ret = gpio_backlight_probe_dt(pdev, gbl);
-		if (ret)
-			return ret;
-	} else {
+	if (pdata) {
 		/*
 		 * Legacy platform data GPIO retrieveal. Do not expand
 		 * the use of this code path, currently only used by one
@@ -126,6 +114,10 @@ static int gpio_backlight_probe(struct platform_device *pdev)
 		gbl->gpiod = gpio_to_desc(pdata->gpio);
 		if (!gbl->gpiod)
 			return -EINVAL;
+	} else {
+		ret = gpio_backlight_probe_prop(pdev, gbl);
+		if (ret)
+			return ret;
 	}
 
 	memset(&props, 0, sizeof(props));
-- 
2.21.0