linux-kernel - Re: [PATCH 5/5] drm-bridge: display-connector: Switch to use fwnode API

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Message-ID: <20240123012026.GC22880@pendragon.ideasonboard.com>
Date: Tue, 23 Jan 2024 03:20:26 +0200
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Sui Jingfeng <sui.jingfeng@...ux.dev>
Cc: David Airlie <airlied@...il.com>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	Daniel Vetter <daniel@...ll.ch>, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	Sui Jingfeng <suijingfeng@...ngson.cn>
Subject: Re: [PATCH 5/5] drm-bridge: display-connector: Switch to use fwnode
 API

On Tue, Jan 23, 2024 at 12:32:20AM +0800, Sui Jingfeng wrote:
> From: Sui Jingfeng <suijingfeng@...ngson.cn>
> 
> Because API has wider coverage, it can be used on non-DT systems as well.
> 
> Signed-off-by: Sui Jingfeng <suijingfeng@...ngson.cn>
> ---
>  drivers/gpu/drm/bridge/display-connector.c | 22 ++++++++++++----------
>  1 file changed, 12 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/display-connector.c b/drivers/gpu/drm/bridge/display-connector.c
> index eb7e194e7735..2c3e54a458e8 100644
> --- a/drivers/gpu/drm/bridge/display-connector.c
> +++ b/drivers/gpu/drm/bridge/display-connector.c
> @@ -243,8 +243,8 @@ static int display_connector_probe(struct platform_device *pdev)
>  	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(pdev->dev.fwnode, "analog");
> +		digital = fwnode_property_present(pdev->dev.fwnode, "digital");
>  		if (analog && !digital) {
>  			conn->bridge.type = DRM_MODE_CONNECTOR_DVIA;
>  		} else if (!analog && digital) {
> @@ -261,8 +261,8 @@ 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(pdev->dev.fwnode, "type",
> +						  &hdmi_type);
>  		if (ret < 0) {
>  			dev_err(&pdev->dev, "HDMI connector with no type\n");
>  			return -EINVAL;
> @@ -292,7 +292,7 @@ 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(pdev->dev.fwnode, "label", &label);
>  
>  	/*
>  	 * Get the HPD GPIO for DVI, HDMI and DP connectors. If the GPIO can provide
> @@ -330,12 +330,13 @@ 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 *fwnode;
>  
> -		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);
> +		fwnode = fwnode_find_reference(pdev->dev.fwnode, "ddc-i2c-bus", 0);
> +		if (!IS_ERR_OR_NULL(fwnode)) {
> +			dev_info(&pdev->dev, "has I2C bus property\n");

This looks like a debugging leftover.

> +			conn->bridge.ddc = i2c_get_adapter_by_fwnode(fwnode);
> +			fwnode_handle_put(fwnode);
>  			if (!conn->bridge.ddc)
>  				return -EPROBE_DEFER;
>  		} else {
> @@ -380,6 +381,7 @@ static int display_connector_probe(struct platform_device *pdev)
>  
>  	conn->bridge.funcs = &display_connector_bridge_funcs;
>  	conn->bridge.of_node = pdev->dev.of_node;
> +	conn->bridge.fwnode = pdev->dev.fwnode;

This goes in the right direction. Let's address the other drivers and
drop the OF-based calls in the same series :-)

>  
>  	if (conn->bridge.ddc)
>  		conn->bridge.ops |= DRM_BRIDGE_OP_EDID

-- 
Regards,

Laurent Pinchart