linux-kernel - [PATCH 2/6] drm/sitronix/st7571-i2c: add 'struct device' to st7571

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Message-Id: <20251024-st7571-split-v1-2-d3092b98130f@gmail.com>
Date: Fri, 24 Oct 2025 12:56:53 +0200
From: Marcus Folkesson <marcus.folkesson@...il.com>
To: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 Marcus Folkesson <marcus.folkesson@...il.com>
Subject: [PATCH 2/6] drm/sitronix/st7571-i2c: add 'struct device' to
 st7571_device

Keep a copy of the device structure instead of referring to i2c_client.
This is a preparation step to separate the generic part from all i2c
stuff.

Signed-off-by: Marcus Folkesson <marcus.folkesson@...il.com>
---
 drivers/gpu/drm/sitronix/st7571-i2c.c | 30 ++++++++++++++++--------------
 1 file changed, 16 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/sitronix/st7571-i2c.c b/drivers/gpu/drm/sitronix/st7571-i2c.c
index 71814a3eb93b7adf554da082a0237da371e5f5b5..2b52919d7dd434bb16aa66274eae8730649f62f1 100644
--- a/drivers/gpu/drm/sitronix/st7571-i2c.c
+++ b/drivers/gpu/drm/sitronix/st7571-i2c.c
@@ -113,6 +113,7 @@ struct st7571_panel_format {
 
 struct st7571_device {
 	struct drm_device drm;
+	struct device *dev;
 
 	struct drm_plane primary_plane;
 	struct drm_crtc crtc;
@@ -741,7 +742,7 @@ static const struct regmap_config st7571_regmap_config = {
 
 static int st7571_validate_parameters(struct st7571_device *st7571)
 {
-	struct device *dev = st7571->dev.dev;
+	struct device *dev = st7571->dev;
 	const struct st7571_panel_constraints *constraints = &st7571->pdata->constraints;
 
 	if (st7571->width_mm  == 0) {
@@ -781,7 +782,7 @@ static int st7571_validate_parameters(struct st7571_device *st7571)
 
 static int st7567_parse_dt(struct st7571_device *st7567)
 {
-	struct device *dev = &st7567->client->dev;
+	struct device *dev = st7567->dev;
 	struct device_node *np = dev->of_node;
 	struct display_timing dt;
 	int ret;
@@ -808,7 +809,7 @@ static int st7567_parse_dt(struct st7571_device *st7567)
 
 static int st7571_parse_dt(struct st7571_device *st7571)
 {
-	struct device *dev = &st7571->client->dev;
+	struct device *dev = st7571->dev;
 	struct device_node *np = dev->of_node;
 	struct display_timing dt;
 	int ret;
@@ -943,9 +944,10 @@ static int st7571_probe(struct i2c_client *client)
 		return PTR_ERR(st7571);
 
 	drm = &st7571->drm;
+	st7571->dev = &client->dev;
 	st7571->client = client;
 	i2c_set_clientdata(client, st7571);
-	st7571->pdata = device_get_match_data(&client->dev);
+	st7571->pdata = device_get_match_data(st7571->dev);
 
 	ret = st7571->pdata->parse_dt(st7571);
 	if (ret)
@@ -966,20 +968,20 @@ static int st7571_probe(struct i2c_client *client)
 	if (i2c_check_functionality(client->adapter, I2C_FUNC_PROTOCOL_MANGLING))
 		st7571->ignore_nak = true;
 
-	st7571->regmap = devm_regmap_init(&client->dev, &st7571_regmap_bus,
+	st7571->regmap = devm_regmap_init(st7571->dev, &st7571_regmap_bus,
 					  client, &st7571_regmap_config);
 	if (IS_ERR(st7571->regmap)) {
-		return dev_err_probe(&client->dev, PTR_ERR(st7571->regmap),
+		return dev_err_probe(st7571->dev, PTR_ERR(st7571->regmap),
 				     "Failed to initialize regmap\n");
 	}
 
-	st7571->hwbuf = devm_kzalloc(&client->dev,
+	st7571->hwbuf = devm_kzalloc(st7571->dev,
 				     (st7571->nlines * st7571->ncols * st7571->bpp) / 8,
 				     GFP_KERNEL);
 	if (!st7571->hwbuf)
 		return -ENOMEM;
 
-	st7571->row = devm_kzalloc(&client->dev,
+	st7571->row = devm_kzalloc(st7571->dev,
 				   (st7571->ncols * st7571->bpp),
 				   GFP_KERNEL);
 	if (!st7571->row)
@@ -987,34 +989,34 @@ static int st7571_probe(struct i2c_client *client)
 
 	ret = st7571_mode_config_init(st7571);
 	if (ret)
-		return dev_err_probe(&client->dev, ret,
+		return dev_err_probe(st7571->dev, ret,
 				     "Failed to initialize mode config\n");
 
 	ret = st7571_plane_init(st7571, st7571->pformat);
 	if (ret)
-		return dev_err_probe(&client->dev, ret,
+		return dev_err_probe(st7571->dev, ret,
 				     "Failed to initialize primary plane\n");
 
 	ret = st7571_crtc_init(st7571);
 	if (ret < 0)
-		return dev_err_probe(&client->dev, ret,
+		return dev_err_probe(st7571->dev, ret,
 				     "Failed to initialize CRTC\n");
 
 	ret = st7571_encoder_init(st7571);
 	if (ret < 0)
-		return dev_err_probe(&client->dev, ret,
+		return dev_err_probe(st7571->dev, ret,
 				     "Failed to initialize encoder\n");
 
 	ret = st7571_connector_init(st7571);
 	if (ret < 0)
-		return dev_err_probe(&client->dev, ret,
+		return dev_err_probe(st7571->dev, ret,
 				     "Failed to initialize connector\n");
 
 	drm_mode_config_reset(drm);
 
 	ret = drm_dev_register(drm, 0);
 	if (ret)
-		return dev_err_probe(&client->dev, ret,
+		return dev_err_probe(st7571->dev, ret,
 				     "Failed to register DRM device\n");
 
 	drm_client_setup(drm, NULL);

-- 
2.50.1