linux-kernel - [PATCH v6 08/10] drm/bridge: tfp410: Use fwnode APIs to acquire device properties

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Date: Mon, 27 May 2024 04:21:13 +0800
From: Sui Jingfeng <sui.jingfeng@...ux.dev>
To: Robert Foss <rfoss@...nel.org>,
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>
Cc: dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	Sui Jingfeng <sui.jingfeng@...ux.dev>
Subject: [PATCH v6 08/10] drm/bridge: tfp410: Use fwnode APIs to acquire device properties

Make this driver less DT-dependent by calling the newly created helpers,
also switch to use fwnode APIs to acquire additional device properties.
No functional changes for DT-based systems.

Signed-off-by: Sui Jingfeng <sui.jingfeng@...ux.dev>
---
 drivers/gpu/drm/bridge/ti-tfp410.c | 39 +++++++++++++++---------------
 1 file changed, 20 insertions(+), 19 deletions(-)

diff --git a/drivers/gpu/drm/bridge/ti-tfp410.c b/drivers/gpu/drm/bridge/ti-tfp410.c
index 04a341133488..a1fae5e9dafd 100644
--- a/drivers/gpu/drm/bridge/ti-tfp410.c
+++ b/drivers/gpu/drm/bridge/ti-tfp410.c
@@ -261,8 +261,9 @@ static const struct drm_bridge_timings tfp410_default_timings = {
 
 static int tfp410_parse_timings(struct tfp410 *dvi, bool i2c)
 {
+	struct fwnode_handle *fwnode = dev_fwnode(dvi->dev);
 	struct drm_bridge_timings *timings = &dvi->timings;
-	struct device_node *ep;
+	struct fwnode_handle *ep;
 	u32 pclk_sample = 0;
 	u32 bus_width = 24;
 	u32 deskew = 0;
@@ -283,14 +284,14 @@ static int tfp410_parse_timings(struct tfp410 *dvi, bool i2c)
 	 * and EDGE pins. They are specified in DT through endpoint properties
 	 * and vendor-specific properties.
 	 */
-	ep = of_graph_get_endpoint_by_regs(dvi->dev->of_node, 0, 0);
+	ep = fwnode_graph_get_endpoint_by_id(fwnode, 0, 0, 0);
 	if (!ep)
 		return -EINVAL;
 
 	/* Get the sampling edge from the endpoint. */
-	of_property_read_u32(ep, "pclk-sample", &pclk_sample);
-	of_property_read_u32(ep, "bus-width", &bus_width);
-	of_node_put(ep);
+	fwnode_property_read_u32(ep, "pclk-sample", &pclk_sample);
+	fwnode_property_read_u32(ep, "bus-width", &bus_width);
+	fwnode_handle_put(ep);
 
 	timings->input_bus_flags = DRM_BUS_FLAG_DE_HIGH;
 
@@ -319,7 +320,7 @@ static int tfp410_parse_timings(struct tfp410 *dvi, bool i2c)
 	}
 
 	/* Get the setup and hold time from vendor-specific properties. */
-	of_property_read_u32(dvi->dev->of_node, "ti,deskew", &deskew);
+	fwnode_property_read_u32(fwnode, "ti,deskew", &deskew);
 	if (deskew > 7)
 		return -EINVAL;
 
@@ -331,12 +332,12 @@ static int tfp410_parse_timings(struct tfp410 *dvi, bool i2c)
 
 static int tfp410_init(struct device *dev, bool i2c)
 {
-	struct device_node *node;
+	struct fwnode_handle *fwnode = dev_fwnode(dev);
 	struct tfp410 *dvi;
 	int ret;
 
-	if (!dev->of_node) {
-		dev_err(dev, "device-tree data is missing\n");
+	if (!fwnode) {
+		dev_err(dev, "firmware data is missing\n");
 		return -ENXIO;
 	}
 
@@ -356,15 +357,15 @@ static int tfp410_init(struct device *dev, bool i2c)
 		return ret;
 
 	/* Get the next bridge, connected to port@1. */
-	node = of_graph_get_remote_node(dev->of_node, 1, -1);
-	if (!node)
-		return -ENODEV;
-
-	dvi->next_bridge = of_drm_find_bridge(node);
-	of_node_put(node);
-
-	if (!dvi->next_bridge)
+	dvi->next_bridge = drm_bridge_find_next_bridge_by_fwnode(fwnode, 1);
+	if (IS_ERR(dvi->next_bridge)) {
+		ret = PTR_ERR(dvi->next_bridge);
+		dev_err(dev, "Error in founding the next bridge: %d\n", ret);
+		return ret;
+	} else if (!dvi->next_bridge) {
+		dev_dbg(dev, "Next bridge not found, deferring probe\n");
 		return -EPROBE_DEFER;
+	}
 
 	/* Get the powerdown GPIO. */
 	dvi->powerdown = devm_gpiod_get_optional(dev, "powerdown",
@@ -416,10 +417,10 @@ static struct platform_driver tfp410_platform_driver = {
 /* There is currently no i2c functionality. */
 static int tfp410_i2c_probe(struct i2c_client *client)
 {
+	struct fwnode_handle *fwnode = dev_fwnode(&client->dev);
 	int reg;
 
-	if (!client->dev.of_node ||
-	    of_property_read_u32(client->dev.of_node, "reg", &reg)) {
+	if (!fwnode || fwnode_property_read_u32(fwnode, "reg", &reg)) {
 		dev_err(&client->dev,
 			"Can't get i2c reg property from device-tree\n");
 		return -ENXIO;
-- 
2.34.1