linux-kernel - [PATCH v6 2/3] media: i2c: imx412: Assign v4l2 device subname based on compat string

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Date:   Fri, 14 Oct 2022 19:04:16 +0100
From:   Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To:     sakari.ailus@....fi, dave.stevenson@...pberrypi.com,
        jacopo@...ndi.org, paul.j.murphy@...el.com,
        daniele.alessandrelli@...el.com, mchehab@...nel.org,
        linux-media@...r.kernel.org
Cc:     bryan.odonoghue@...aro.org, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v6 2/3] media: i2c: imx412: Assign v4l2 device subname based on compat string

imx412 and imx577 return the same chip-id when interrogated via i2c.
I've confirmed this myself by

Sakari suggested we should add a new compat which should be reflected in
the name of the media entity

https://patchwork.kernel.org/project/linux-media/patch/20220607134057.2427663-3-bryan.odonoghue@linaro.org/#24894500

Set up the .data parameter of of_device_id to pass a string which
we use to set the media entity name. Once done we can add in imx577 as a
compatible chips with the media names reflecting the directed compat string.

Cc: sakari.ailus@....fi
Cc: dave.stevenson@...pberrypi.com
Cc: jacopo@...ndi.org
Cc: "Paul J. Murphy" <paul.j.murphy@...el.com>
Cc: Daniele Alessandrelli <daniele.alessandrelli@...el.com>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: Rob Herring <robh+dt@...nel.org>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc: linux-media@...r.kernel.org
Cc: devicetree@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
---
 drivers/media/i2c/imx412.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/media/i2c/imx412.c b/drivers/media/i2c/imx412.c
index 7f6d29e0e7c4..353304312e1c 100644
--- a/drivers/media/i2c/imx412.c
+++ b/drivers/media/i2c/imx412.c
@@ -1172,6 +1172,7 @@ static int imx412_init_controls(struct imx412 *imx412)
 static int imx412_probe(struct i2c_client *client)
 {
 	struct imx412 *imx412;
+	const char *name;
 	int ret;
 
 	imx412 = devm_kzalloc(&client->dev, sizeof(*imx412), GFP_KERNEL);
@@ -1179,6 +1180,9 @@ static int imx412_probe(struct i2c_client *client)
 		return -ENOMEM;
 
 	imx412->dev = &client->dev;
+	name = device_get_match_data(&client->dev);
+	if (!name)
+		return -ENODEV;
 
 	/* Initialize subdev */
 	v4l2_i2c_subdev_init(&imx412->sd, client, &imx412_subdev_ops);
@@ -1218,6 +1222,8 @@ static int imx412_probe(struct i2c_client *client)
 	imx412->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
 	imx412->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
 
+	v4l2_i2c_subdev_set_name(&imx412->sd, client, name, NULL);
+
 	/* Initialize source pad */
 	imx412->pad.flags = MEDIA_PAD_FL_SOURCE;
 	ret = media_entity_pads_init(&imx412->sd.entity, 1, &imx412->pad);
@@ -1279,7 +1285,7 @@ static const struct dev_pm_ops imx412_pm_ops = {
 };
 
 static const struct of_device_id imx412_of_match[] = {
-	{ .compatible = "sony,imx412" },
+	{ .compatible = "sony,imx412", .data = "imx412" },
 	{ }
 };
 
-- 
2.34.1