mfd: rk8xx-i2c: Use device_get_match_data

Simplify the device identification logic by supplying the relevant
information via of_match_data. This also removes the dev_info()
printing the chip version, since that's supplied by the match data
now.

Due to lack of hardware this change is compile-tested only.

Tested-by: Diederik de Haas <didi.debian@cknow.org> # Rock64, Quartz64 Model A + B
Tested-by: Vincent Legoll <vincent.legoll@gmail.com> # Pine64 QuartzPro64
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Link: https://lore.kernel.org/r/20230504173618.142075-7-sebastian.reichel@collabora.com
Signed-off-by: Lee Jones <lee@kernel.org>

drivers/mfd/rk8xx-core.c

@@ -597,8 +597,6 @@ int rk8xx_probe(struct device *dev, int variant, unsigned int irq, struct regmap
 		return -EINVAL;
 	}
 
-	dev_info(dev, "chip id: 0x%x\n", (unsigned int)rk808->variant);
-
 	if (!irq)
 		return dev_err_probe(dev, -EINVAL, "No interrupt support, no core IRQ\n");
 

drivers/mfd/rk8xx-i2c.c

@@ -16,6 +16,11 @@
 #include <linux/of.h>
 #include <linux/regmap.h>
 
+struct rk8xx_i2c_platform_data {
+	const struct regmap_config *regmap_cfg;
+	int variant;
+};
+
 static bool rk808_is_volatile_reg(struct device *dev, unsigned int reg)
 {
 	/*
@@ -103,66 +108,46 @@ static const struct regmap_config rk817_regmap_config = {
 	.volatile_reg = rk817_is_volatile_reg,
 };
 
-static int rk8xx_i2c_get_variant(struct i2c_client *client)
-{
-	u8 pmic_id_msb, pmic_id_lsb;
-	int msb, lsb;
+static const struct rk8xx_i2c_platform_data rk805_data = {
+	.regmap_cfg = &rk805_regmap_config,
+	.variant = RK805_ID,
+};
 
-	if (of_device_is_compatible(client->dev.of_node, "rockchip,rk817") ||
-	    of_device_is_compatible(client->dev.of_node, "rockchip,rk809")) {
-		pmic_id_msb = RK817_ID_MSB;
-		pmic_id_lsb = RK817_ID_LSB;
-	} else {
-		pmic_id_msb = RK808_ID_MSB;
-		pmic_id_lsb = RK808_ID_LSB;
-	}
+static const struct rk8xx_i2c_platform_data rk808_data = {
+	.regmap_cfg = &rk808_regmap_config,
+	.variant = RK808_ID,
+};
 
-	/* Read chip variant */
-	msb = i2c_smbus_read_byte_data(client, pmic_id_msb);
-	if (msb < 0)
-		return dev_err_probe(&client->dev, msb, "failed to read the chip id MSB\n");
+static const struct rk8xx_i2c_platform_data rk809_data = {
+	.regmap_cfg = &rk817_regmap_config,
+	.variant = RK809_ID,
+};
 
-	lsb = i2c_smbus_read_byte_data(client, pmic_id_lsb);
-	if (lsb < 0)
-		return dev_err_probe(&client->dev, lsb, "failed to read the chip id LSB\n");
+static const struct rk8xx_i2c_platform_data rk817_data = {
+	.regmap_cfg = &rk817_regmap_config,
+	.variant = RK817_ID,
+};
 
-	return ((msb << 8) | lsb) & RK8XX_ID_MSK;
-}
+static const struct rk8xx_i2c_platform_data rk818_data = {
+	.regmap_cfg = &rk818_regmap_config,
+	.variant = RK818_ID,
+};
 
 static int rk8xx_i2c_probe(struct i2c_client *client)
 {
-	const struct regmap_config *regmap_cfg;
+	const struct rk8xx_i2c_platform_data *data;
 	struct regmap *regmap;
-	int variant;
 
-	variant = rk8xx_i2c_get_variant(client);
-	if (variant < 0)
-		return variant;
+	data = device_get_match_data(&client->dev);
+	if (!data)
+		return -ENODEV;
 
-	switch (variant) {
-	case RK805_ID:
-		regmap_cfg = &rk805_regmap_config;
-		break;
-	case RK808_ID:
-		regmap_cfg = &rk808_regmap_config;
-		break;
-	case RK818_ID:
-		regmap_cfg = &rk818_regmap_config;
-		break;
-	case RK809_ID:
-	case RK817_ID:
-		regmap_cfg = &rk817_regmap_config;
-		break;
-	default:
-		return dev_err_probe(&client->dev, -EINVAL, "Unsupported RK8XX ID %x\n", variant);
-	}
-
-	regmap = devm_regmap_init_i2c(client, regmap_cfg);
+	regmap = devm_regmap_init_i2c(client, data->regmap_cfg);
 	if (IS_ERR(regmap))
 		return dev_err_probe(&client->dev, PTR_ERR(regmap),
 				     "regmap initialization failed\n");
 
-	return rk8xx_probe(&client->dev, variant, client->irq, regmap);
+	return rk8xx_probe(&client->dev, data->variant, client->irq, regmap);
 }
 
 static void rk8xx_i2c_shutdown(struct i2c_client *client)
@@ -173,11 +158,11 @@ static void rk8xx_i2c_shutdown(struct i2c_client *client)
 static SIMPLE_DEV_PM_OPS(rk8xx_i2c_pm_ops, rk8xx_suspend, rk8xx_resume);
 
 static const struct of_device_id rk8xx_i2c_of_match[] = {
-	{ .compatible = "rockchip,rk805" },
-	{ .compatible = "rockchip,rk808" },
-	{ .compatible = "rockchip,rk809" },
-	{ .compatible = "rockchip,rk817" },
-	{ .compatible = "rockchip,rk818" },
+	{ .compatible = "rockchip,rk805", .data = &rk805_data },
+	{ .compatible = "rockchip,rk808", .data = &rk808_data },
+	{ .compatible = "rockchip,rk809", .data = &rk809_data },
+	{ .compatible = "rockchip,rk817", .data = &rk817_data },
+	{ .compatible = "rockchip,rk818", .data = &rk818_data },
 	{ },
 };
 MODULE_DEVICE_TABLE(of, rk8xx_i2c_of_match);