media: sun6i-csi: Define and use variant to get module clock rate

Introduce a proper variant structure with the module clock rate
instead of hardcoding it with a manual check on the compatible.
Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c

@@ -808,11 +808,15 @@ static int sun6i_csi_resources_setup(struct sun6i_csi_device *csi_dev,
 				     struct platform_device *platform_dev)
 {
 	struct device *dev = csi_dev->dev;
-	unsigned long clock_mod_rate;
+	const struct sun6i_csi_variant *variant;
 	void __iomem *io_base;
 	int ret;
 	int irq;
 
+	variant = of_device_get_match_data(dev);
+	if (!variant)
+		return -EINVAL;
+
 	/* Registers */
 
 	io_base = devm_platform_ioremap_resource(platform_dev, 0);
@@ -840,12 +844,8 @@ static int sun6i_csi_resources_setup(struct sun6i_csi_device *csi_dev,
 		return PTR_ERR(csi_dev->clock_ram);
 	}
 
-	if (of_device_is_compatible(dev->of_node, "allwinner,sun50i-a64-csi"))
-		clock_mod_rate = 300000000;
-	else
-		clock_mod_rate = 297000000;
-
-	ret = clk_set_rate_exclusive(csi_dev->clock_mod, clock_mod_rate);
+	ret = clk_set_rate_exclusive(csi_dev->clock_mod,
+				     variant->clock_mod_rate);
 	if (ret) {
 		dev_err(dev, "failed to set mod clock rate\n");
 		return ret;
@@ -928,12 +928,35 @@ static int sun6i_csi_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static const struct sun6i_csi_variant sun6i_a31_csi_variant = {
+	.clock_mod_rate	= 297000000,
+};
+
+static const struct sun6i_csi_variant sun50i_a64_csi_variant = {
+	.clock_mod_rate	= 300000000,
+};
+
 static const struct of_device_id sun6i_csi_of_match[] = {
-	{ .compatible = "allwinner,sun6i-a31-csi", },
-	{ .compatible = "allwinner,sun8i-a83t-csi", },
-	{ .compatible = "allwinner,sun8i-h3-csi", },
-	{ .compatible = "allwinner,sun8i-v3s-csi", },
-	{ .compatible = "allwinner,sun50i-a64-csi", },
+	{
+		.compatible	= "allwinner,sun6i-a31-csi",
+		.data		= &sun6i_a31_csi_variant,
+	},
+	{
+		.compatible	= "allwinner,sun8i-a83t-csi",
+		.data		= &sun6i_a31_csi_variant,
+	},
+	{
+		.compatible	= "allwinner,sun8i-h3-csi",
+		.data		= &sun6i_a31_csi_variant,
+	},
+	{
+		.compatible	= "allwinner,sun8i-v3s-csi",
+		.data		= &sun6i_a31_csi_variant,
+	},
+	{
+		.compatible	= "allwinner,sun50i-a64-csi",
+		.data		= &sun50i_a64_csi_variant,
+	},
 	{},
 };
 

drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.h

@@ -58,6 +58,10 @@ struct sun6i_csi_device {
 	int				planar_offset[3];
 };
 
+struct sun6i_csi_variant {
+	unsigned long	clock_mod_rate;
+};
+
 /**
  * sun6i_csi_is_format_supported() - check if the format supported by csi
  * @csi_dev:	pointer to the csi device