Re: [PATCH 4/4] video: fbdev: replace of_graph_get_next_endpoint()

From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Cc: "Lad,  Prabhakar" <prabhakar.csengg@gmail.com>,
	"\"Uwe Kleine-König\"" <u.kleine-koenig@pengutronix.de>,
	"Alexandre Belloni" <alexandre.belloni@bootlin.com>,
	"Alexandre Torgue" <alexandre.torgue@foss.st.com>,
	"Alexey Brodkin" <abrodkin@synopsys.com>,
	"Alim Akhtar" <alim.akhtar@samsung.com>,
	"Andrzej Hajda" <andrzej.hajda@intel.com>,
	"Biju Das" <biju.das.jz@bp.renesas.com>,
	"Broadcom internal kernel review list"
	<bcm-kernel-feedback-list@broadcom.com>,
	"Claudiu Beznea" <claudiu.beznea@tuxon.dev>,
	"Daniel Vetter" <daniel@ffwll.ch>,
	"Dave Stevenson" <dave.stevenson@raspberrypi.com>,
	"David Airlie" <airlied@gmail.com>,
	"Eugen Hristev" <eugen.hristev@collabora.com>,
	"Florian Fainelli" <florian.fainelli@broadcom.com>,
	"Hans Verkuil" <hverkuil-cisco@xs4all.nl>,
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	"Jacopo Mondi" <jacopo@jmondi.org>,
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	"Krzysztof Kozlowski" <krzysztof.kozlowski@linaro.org>,
	"Maarten Lankhorst" <maarten.lankhorst@linux.intel.com>,
	"Mauro Carvalho Chehab" <mchehab@kernel.org>,
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	"Neil Armstrong" <neil.armstrong@linaro.org>,
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	"Russell King" <linux@armlinux.org.uk>,
	"Sakari Ailus" <sakari.ailus@linux.intel.com>,
	"Sam Ravnborg" <sam@ravnborg.org>,
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	"Thomas Zimmermann" <tzimmermann@suse.de>,
	"Tim Harvey" <tharvey@gateworks.com>,
	dri-devel@lists.freedesktop.org,
	linux-arm-kernel@lists.infradead.org,
	linux-fbdev@vger.kernel.org, linux-media@vger.kernel.org,
	linux-omap@vger.kernel.org, linux-rpi-kernel@lists.infradead.org,
	linux-samsung-soc@vger.kernel.org,
	linux-stm32@st-md-mailman.stormreply.com
Subject: Re: [PATCH 4/4] video: fbdev: replace of_graph_get_next_endpoint()
Date: Tue, 6 Feb 2024 18:44:29 +0200	[thread overview]
Message-ID: <20240206164429.GD2827@pendragon.ideasonboard.com> (raw)
In-Reply-To: <87o7cunvwv.wl-kuninori.morimoto.gx@renesas.com>

Hi Morimoto-san,

Thank you for the patch.

On Tue, Feb 06, 2024 at 02:55:45AM +0000, Kuninori Morimoto wrote:
> From DT point of view, in general, drivers should be asking for a
> specific port number because their function is fixed in the binding.
> 
> of_graph_get_next_endpoint() doesn't match to this concept.
> 
> Simply replace
> 
> 	- of_graph_get_next_endpoint(xxx, NULL);
> 	+ of_graph_get_endpoint_by_regs(xxx, 0, -1);
> 
> Link: https://lore.kernel.org/r/20240202174941.GA310089-robh@kernel.org
> Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
> ---
>  drivers/video/fbdev/amba-clcd.c               |  2 +-
>  drivers/video/fbdev/omap2/omapfb/dss/dsi.c    |  3 ++-
>  drivers/video/fbdev/omap2/omapfb/dss/dss-of.c | 20 +------------------
>  drivers/video/fbdev/omap2/omapfb/dss/hdmi4.c  |  3 ++-
>  drivers/video/fbdev/omap2/omapfb/dss/hdmi5.c  |  3 ++-
>  drivers/video/fbdev/omap2/omapfb/dss/venc.c   |  3 ++-
>  drivers/video/fbdev/pxafb.c                   |  2 +-
>  include/video/omapfb_dss.h                    |  3 ---
>  8 files changed, 11 insertions(+), 28 deletions(-)
> 
> diff --git a/drivers/video/fbdev/amba-clcd.c b/drivers/video/fbdev/amba-clcd.c
> index 0399db369e70..2371b204cfd2 100644
> --- a/drivers/video/fbdev/amba-clcd.c
> +++ b/drivers/video/fbdev/amba-clcd.c

This driver has been deleted in v6.8-rc1.

> @@ -691,7 +691,7 @@ static int clcdfb_of_init_display(struct clcd_fb *fb)
>  	/*
>  	 * Fetch the panel endpoint.
>  	 */
> -	endpoint = of_graph_get_next_endpoint(fb->dev->dev.of_node, NULL);
> +	endpoint = of_graph_get_endpoint_by_regs(fb->dev->dev.of_node, 0, -1);
>  	if (!endpoint)
>  		return -ENODEV;
>  
> diff --git a/drivers/video/fbdev/omap2/omapfb/dss/dsi.c b/drivers/video/fbdev/omap2/omapfb/dss/dsi.c
> index b7eb17a16ec4..1f13bcf73da5 100644
> --- a/drivers/video/fbdev/omap2/omapfb/dss/dsi.c
> +++ b/drivers/video/fbdev/omap2/omapfb/dss/dsi.c
> @@ -28,6 +28,7 @@
>  #include <linux/debugfs.h>
>  #include <linux/pm_runtime.h>
>  #include <linux/of.h>
> +#include <linux/of_graph.h>
>  #include <linux/of_platform.h>
>  #include <linux/component.h>
>  
> @@ -5079,7 +5080,7 @@ static int dsi_probe_of(struct platform_device *pdev)
>  	struct device_node *ep;
>  	struct omap_dsi_pin_config pin_cfg;
>  
> -	ep = omapdss_of_get_first_endpoint(node);
> +	ep = of_graph_get_endpoint_by_regs(node, 0, -1);
>  	if (!ep)
>  		return 0;
>  
> diff --git a/drivers/video/fbdev/omap2/omapfb/dss/dss-of.c b/drivers/video/fbdev/omap2/omapfb/dss/dss-of.c
> index 0282d4eef139..14965a3fd05b 100644
> --- a/drivers/video/fbdev/omap2/omapfb/dss/dss-of.c
> +++ b/drivers/video/fbdev/omap2/omapfb/dss/dss-of.c
> @@ -130,24 +130,6 @@ static struct device_node *omapdss_of_get_remote_port(const struct device_node *
>  	return np;
>  }
>  
> -struct device_node *
> -omapdss_of_get_first_endpoint(const struct device_node *parent)
> -{
> -	struct device_node *port, *ep;
> -
> -	port = omapdss_of_get_next_port(parent, NULL);
> -
> -	if (!port)
> -		return NULL;
> -
> -	ep = omapdss_of_get_next_endpoint(port, NULL);
> -
> -	of_node_put(port);
> -
> -	return ep;
> -}
> -EXPORT_SYMBOL_GPL(omapdss_of_get_first_endpoint);
> -

I *think* replacing omapdss_of_get_first_endpoint() with
of_graph_get_endpoint_by_regs(0, -1) is functionally equivalent in all
cases, but a confirmation from Tomi would be nice. I wonder if it
wouldn't be time to drop the fbdev driver though...

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

>  struct omap_dss_device *
>  omapdss_of_find_source_for_first_ep(struct device_node *node)
>  {
> @@ -155,7 +137,7 @@ omapdss_of_find_source_for_first_ep(struct device_node *node)
>  	struct device_node *src_port;
>  	struct omap_dss_device *src;
>  
> -	ep = omapdss_of_get_first_endpoint(node);
> +	ep = of_graph_get_endpoint_by_regs(node, 0, -1);
>  	if (!ep)
>  		return ERR_PTR(-EINVAL);
>  
> diff --git a/drivers/video/fbdev/omap2/omapfb/dss/hdmi4.c b/drivers/video/fbdev/omap2/omapfb/dss/hdmi4.c
> index f05b4e35a842..8f407ec134dc 100644
> --- a/drivers/video/fbdev/omap2/omapfb/dss/hdmi4.c
> +++ b/drivers/video/fbdev/omap2/omapfb/dss/hdmi4.c
> @@ -20,6 +20,7 @@
>  #include <linux/pm_runtime.h>
>  #include <linux/clk.h>
>  #include <linux/of.h>
> +#include <linux/of_graph.h>
>  #include <linux/regulator/consumer.h>
>  #include <linux/component.h>
>  #include <video/omapfb_dss.h>
> @@ -529,7 +530,7 @@ static int hdmi_probe_of(struct platform_device *pdev)
>  	struct device_node *ep;
>  	int r;
>  
> -	ep = omapdss_of_get_first_endpoint(node);
> +	ep = of_graph_get_endpoint_by_regs(node, 0, -1);
>  	if (!ep)
>  		return 0;
>  
> diff --git a/drivers/video/fbdev/omap2/omapfb/dss/hdmi5.c b/drivers/video/fbdev/omap2/omapfb/dss/hdmi5.c
> index 03292945b1d4..4ad219f522b9 100644
> --- a/drivers/video/fbdev/omap2/omapfb/dss/hdmi5.c
> +++ b/drivers/video/fbdev/omap2/omapfb/dss/hdmi5.c
> @@ -25,6 +25,7 @@
>  #include <linux/pm_runtime.h>
>  #include <linux/clk.h>
>  #include <linux/of.h>
> +#include <linux/of_graph.h>
>  #include <linux/regulator/consumer.h>
>  #include <linux/component.h>
>  #include <video/omapfb_dss.h>
> @@ -561,7 +562,7 @@ static int hdmi_probe_of(struct platform_device *pdev)
>  	struct device_node *ep;
>  	int r;
>  
> -	ep = omapdss_of_get_first_endpoint(node);
> +	ep = of_graph_get_endpoint_by_regs(node, 0, -1);
>  	if (!ep)
>  		return 0;
>  
> diff --git a/drivers/video/fbdev/omap2/omapfb/dss/venc.c b/drivers/video/fbdev/omap2/omapfb/dss/venc.c
> index c9d40e28a06f..0bd80d3b8f1b 100644
> --- a/drivers/video/fbdev/omap2/omapfb/dss/venc.c
> +++ b/drivers/video/fbdev/omap2/omapfb/dss/venc.c
> @@ -24,6 +24,7 @@
>  #include <linux/regulator/consumer.h>
>  #include <linux/pm_runtime.h>
>  #include <linux/of.h>
> +#include <linux/of_graph.h>
>  #include <linux/component.h>
>  
>  #include <video/omapfb_dss.h>
> @@ -764,7 +765,7 @@ static int venc_probe_of(struct platform_device *pdev)
>  	u32 channels;
>  	int r;
>  
> -	ep = omapdss_of_get_first_endpoint(node);
> +	ep = of_graph_get_endpoint_by_regs(node, 0, -1);
>  	if (!ep)
>  		return 0;
>  
> diff --git a/drivers/video/fbdev/pxafb.c b/drivers/video/fbdev/pxafb.c
> index fa943612c4e2..2ef56fa28aff 100644
> --- a/drivers/video/fbdev/pxafb.c
> +++ b/drivers/video/fbdev/pxafb.c
> @@ -2171,7 +2171,7 @@ static int of_get_pxafb_mode_info(struct device *dev,
>  	u32 bus_width;
>  	int ret, i;
>  
> -	np = of_graph_get_next_endpoint(dev->of_node, NULL);
> +	np = of_graph_get_endpoint_by_regs(dev->of_node, 0, -1);
>  	if (!np) {
>  		dev_err(dev, "could not find endpoint\n");
>  		return -EINVAL;
> diff --git a/include/video/omapfb_dss.h b/include/video/omapfb_dss.h
> index e8eaac2cb7b8..a8c0c3eeeb5b 100644
> --- a/include/video/omapfb_dss.h
> +++ b/include/video/omapfb_dss.h
> @@ -819,9 +819,6 @@ struct device_node *
>  omapdss_of_get_next_endpoint(const struct device_node *parent,
>  			     struct device_node *prev);
>  
> -struct device_node *
> -omapdss_of_get_first_endpoint(const struct device_node *parent);
> -
>  struct omap_dss_device *
>  omapdss_of_find_source_for_first_ep(struct device_node *node);
>  #else

-- 
Regards,

Laurent Pinchart