[PATCH v5 06/10] drm-bridge: it66121: Use fwnode APIs to acquire device properties

Sui Jingfeng
2024-05-03T16:41:48Z

Make this driver less DT-dependent by calling the newly created helpers,
also switch to use fwnode APIs to acquire additional device properties.
A side benifit is that boilerplates get reduced, no functional changes
for DT-based systems.

Signed-off-by: Sui Jingfeng <sui.jingfeng@linux.dev>
---
drivers/gpu/drm/bridge/ite-it66121.c | 57 +++++++++++++++++-----------
1 file changed, 35 insertions(+), 22 deletions(-)

diff --git a/drivers/gpu/drm/bridge/ite-it66121.c b/drivers/gpu/drm/bridge/ite-it66121.c
index 925e42f46cd8..688dc1830654 100644
--- a/drivers/gpu/drm/bridge/ite-it66121.c
+++ b/drivers/gpu/drm/bridge/ite-it66121.c
@@ -15,7 +15,6 @@
#include <linux/bitfield.h>
#include <linux/property.h>
#include <linux/regmap.h>
-#include <linux/of_graph.h>
#include <linux/gpio/consumer.h>
#include <linux/pinctrl/consumer.h>
#include <linux/regulator/consumer.h>
@@ -1480,7 +1479,7 @@ static int it66121_audio_codec_init(struct it66121_ctx *ctx, struct device *dev)

dev_dbg(dev, "%s\n", __func__);

- if (!of_property_read_bool(dev->of_node, "#sound-dai-cells")) {
+ if (!fwnode_property_present(dev_fwnode(dev), "#sound-dai-cells")) {
dev_info(dev, "No \"#sound-dai-cells\", no audio\n");
return 0;
}
@@ -1503,13 +1502,36 @@ static const char * const it66121_supplies[] = {
"vcn33", "vcn18", "vrf12"
};

+static int it66121_read_bus_width(struct fwnode_handle *fwnode, u32 *bus_width)
+{
+ struct fwnode_handle *endpoint;
+ u32 val;
+ int ret;
+
+ endpoint = fwnode_graph_get_endpoint_by_id(fwnode, 0, 0, 0);
+ if (!endpoint)
+ return -EINVAL;
+
+ ret = fwnode_property_read_u32(endpoint, "bus-width", &val);
+ fwnode_handle_put(endpoint);
+ if (ret)
+ return ret;
+
+ if (val != 12 && val != 24)
+ return -EINVAL;
+
+ *bus_width = val;
+
+ return 0;
+}
+
static int it66121_probe(struct i2c_client *client)
{
u32 revision_id, vendor_ids[2] = { 0 }, device_ids[2] = { 0 };
- struct device_node *ep;
int ret;
struct it66121_ctx *ctx;
struct device *dev = &client->dev;
+ struct fwnode_handle *fwnode = dev_fwnode(dev);

if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
dev_err(dev, "I2C check functionality failed.\n");
@@ -1520,29 +1542,20 @@ static int it66121_probe(struct i2c_client *client)
if (!ctx)
return -ENOMEM;

- ep = of_graph_get_endpoint_by_regs(dev->of_node, 0, 0);
- if (!ep)
- return -EINVAL;
-
ctx->dev = dev;
ctx->client = client;
ctx->info = i2c_get_match_data(client);

- of_property_read_u32(ep, "bus-width", &ctx->bus_width);
- of_node_put(ep);
-
- if (ctx->bus_width != 12 && ctx->bus_width != 24)
- return -EINVAL;
-
- ep = of_graph_get_remote_node(dev->of_node, 1, -1);
- if (!ep) {
- dev_err(ctx->dev, "The endpoint is unconnected\n");
- return -EINVAL;
- }
+ ret = it66121_read_bus_width(fwnode, &ctx->bus_width);
+ if (ret)
+ return ret;

- ctx->next_bridge = of_drm_find_bridge(ep);
- of_node_put(ep);
- if (!ctx->next_bridge) {
+ ctx->next_bridge = drm_bridge_find_next_bridge_by_fwnode(fwnode, 1);
+ if (IS_ERR(ctx->next_bridge)) {
+ ret = PTR_ERR(ctx->next_bridge);
+ dev_err(dev, "Error in founding the next bridge: %d\n", ret);
+ return ret;
+ } else if (!ctx->next_bridge) {
dev_dbg(ctx->dev, "Next bridge not found, deferring probe\n");
return -EPROBE_DEFER;
}
@@ -1577,8 +1590,8 @@ static int it66121_probe(struct i2c_client *client)
return -ENODEV;
}

+ drm_bridge_set_node(&ctx->bridge, fwnode);
ctx->bridge.funcs = &it66121_bridge_funcs;
- ctx->bridge.of_node = dev->of_node;
ctx->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
ctx->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID;
if (client->irq > 0) {
--
2.34.1