linux-kernel - Re: [PATCH v4 4/9] drm-bridge: display-connector: Use fwnode API to acquire device properties

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Message-ID: <nprf453sxgh3dyy4zh67dty5avuuqnpqf3ua4qpydmfuxb2zjs@jinatrfgjg6u>
Date: Mon, 22 Apr 2024 23:00:16 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Sui Jingfeng <sui.jingfeng@...ux.dev>
Cc: Neil Armstrong <neil.armstrong@...aro.org>, 
	Robert Foss <rfoss@...nel.org>, Laurent Pinchart <Laurent.pinchart@...asonboard.com>, 
	Andrzej Hajda <andrzej.hajda@...el.com>, Jonas Karlman <jonas@...boo.se>, 
	Jernej Skrabec <jernej.skrabec@...il.com>, Maxime Ripard <mripard@...nel.org>, 
	Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, 
	Daniel Vetter <daniel@...ll.ch>, Phong LE <ple@...libre.com>, dri-devel@...ts.freedesktop.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 4/9] drm-bridge: display-connector: Use fwnode API to
 acquire device properties

On Tue, Apr 23, 2024 at 03:18:58AM +0800, Sui Jingfeng wrote:
> Make this driver less DT-dependent by using the fwnode helper functions,
> should be no functional changes for DT based systems. Do the necessary
> works before it can be truely DT-independent, this patch do no harms even
> though there is no user yet.
> 
> Signed-off-by: Sui Jingfeng <sui.jingfeng@...ux.dev>
> ---
>  drivers/gpu/drm/bridge/display-connector.c | 24 +++++++++++-----------
>  1 file changed, 12 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/display-connector.c b/drivers/gpu/drm/bridge/display-connector.c
> index ab8e00baf3f1..d80cb7bc59e6 100644
> --- a/drivers/gpu/drm/bridge/display-connector.c
> +++ b/drivers/gpu/drm/bridge/display-connector.c
> @@ -204,6 +204,7 @@ static int display_connector_get_supply(struct platform_device *pdev,
>  
>  static int display_connector_probe(struct platform_device *pdev)
>  {
> +	struct fwnode_handle *fwnode = dev_fwnode(&pdev->dev);
>  	struct display_connector *conn;
>  	unsigned int type;
>  	const char *label = NULL;
> @@ -215,15 +216,15 @@ static int display_connector_probe(struct platform_device *pdev)
>  
>  	platform_set_drvdata(pdev, conn);
>  
> -	type = (uintptr_t)of_device_get_match_data(&pdev->dev);
> +	type = (uintptr_t)device_get_match_data(&pdev->dev);
>  
>  	/* Get the exact connector type. */
>  	switch (type) {
>  	case DRM_MODE_CONNECTOR_DVII: {
>  		bool analog, digital;
>  
> -		analog = of_property_read_bool(pdev->dev.of_node, "analog");
> -		digital = of_property_read_bool(pdev->dev.of_node, "digital");
> +		analog = fwnode_property_present(fwnode, "analog");
> +		digital = fwnode_property_present(fwnode, "digital");
>  		if (analog && !digital) {
>  			conn->bridge.type = DRM_MODE_CONNECTOR_DVIA;
>  		} else if (!analog && digital) {
> @@ -240,8 +241,7 @@ static int display_connector_probe(struct platform_device *pdev)
>  	case DRM_MODE_CONNECTOR_HDMIA: {
>  		const char *hdmi_type;
>  
> -		ret = of_property_read_string(pdev->dev.of_node, "type",
> -					      &hdmi_type);
> +		ret = fwnode_property_read_string(fwnode, "type", &hdmi_type);
>  		if (ret < 0) {
>  			dev_err(&pdev->dev, "HDMI connector with no type\n");
>  			return -EINVAL;
> @@ -271,7 +271,7 @@ static int display_connector_probe(struct platform_device *pdev)
>  	conn->bridge.interlace_allowed = true;
>  
>  	/* Get the optional connector label. */
> -	of_property_read_string(pdev->dev.of_node, "label", &label);
> +	fwnode_property_read_string(fwnode, "label", &label);
>  
>  	/*
>  	 * Get the HPD GPIO for DVI, HDMI and DP connectors. If the GPIO can provide
> @@ -309,12 +309,12 @@ static int display_connector_probe(struct platform_device *pdev)
>  	if (type == DRM_MODE_CONNECTOR_DVII ||
>  	    type == DRM_MODE_CONNECTOR_HDMIA ||
>  	    type == DRM_MODE_CONNECTOR_VGA) {
> -		struct device_node *phandle;
> +		struct fwnode_handle *phandle;
>  
> -		phandle = of_parse_phandle(pdev->dev.of_node, "ddc-i2c-bus", 0);
> -		if (phandle) {
> -			conn->bridge.ddc = of_get_i2c_adapter_by_node(phandle);
> -			of_node_put(phandle);
> +		phandle = fwnode_find_reference(fwnode, "ddc-i2c-bus", 0);
> +		if (!IS_ERR_OR_NULL(phandle)) {

s/IS_ERR_OR_NULL/IS_ERR/

LGTM otherwise.

> +			conn->bridge.ddc = i2c_get_adapter_by_fwnode(phandle);
> +			fwnode_handle_put(phandle);
>  			if (!conn->bridge.ddc)
>  				return -EPROBE_DEFER;
>  		} else {
> @@ -358,7 +358,7 @@ static int display_connector_probe(struct platform_device *pdev)
>  	}
>  
>  	conn->bridge.funcs = &display_connector_bridge_funcs;
> -	conn->bridge.of_node = pdev->dev.of_node;
> +	drm_bridge_set_node(&conn->bridge, fwnode);
>  
>  	if (conn->bridge.ddc)
>  		conn->bridge.ops |= DRM_BRIDGE_OP_EDID
> -- 
> 2.34.1
> 

-- 
With best wishes
Dmitry