i2c: rk3x: account for const type of of_device_id.data

This driver creates a number of const structures that it stores in
the data field of an of_device_id array.

The data field of an of_device_id structure has type const void *, so
there is no need for a const-discarding cast when putting const values
into such a structure.

Furthermore, adding const to the declaration of the location that
receives a const value from such a field ensures that the compiler
will continue to check that the value is not modified. The
const-discarding cast on the extraction from the data field is thus
no longer needed.

Done using Coccinelle.

Signed-off-by: Julia Lawall <[e-mail]>
Reviewed-by: Heiko Stuebner <[e-mail]>
Signed-off-by: Wolfram Sang <[e-mail]>

drivers/i2c/busses/i2c-rk3x.c

···
 struct rk3x_i2c {
 	struct i2c_adapter adap;
 	struct device *dev;
-	struct rk3x_i2c_soc_data *soc_data;
+	const struct rk3x_i2c_soc_data *soc_data;
 
 	/* Hardware resources */
 	void __iomem *regs;
···
 static const struct of_device_id rk3x_i2c_match[] = {
 	{
 		.compatible = "rockchip,rv1108-i2c",
-		.data = (void *)&rv1108_soc_data
+		.data = &rv1108_soc_data
 	},
 	{
 		.compatible = "rockchip,rk3066-i2c",
-		.data = (void *)&rk3066_soc_data
+		.data = &rk3066_soc_data
 	},
 	{
 		.compatible = "rockchip,rk3188-i2c",
-		.data = (void *)&rk3188_soc_data
+		.data = &rk3188_soc_data
 	},
 	{
 		.compatible = "rockchip,rk3228-i2c",
-		.data = (void *)&rk3228_soc_data
+		.data = &rk3228_soc_data
 	},
 	{
 		.compatible = "rockchip,rk3288-i2c",
-		.data = (void *)&rk3288_soc_data
+		.data = &rk3288_soc_data
 	},
 	{
 		.compatible = "rockchip,rk3399-i2c",
-		.data = (void *)&rk3399_soc_data
+		.data = &rk3399_soc_data
 	},
 	{},
 };
···
 		return -ENOMEM;
 
 	match = of_match_node(rk3x_i2c_match, np);
-	i2c->soc_data = (struct rk3x_i2c_soc_data *)match->data;
+	i2c->soc_data = match->data;
 
 	/* use common interface to get I2C timing properties */
 	i2c_parse_fw_timings(&pdev->dev, &i2c->t, true);