rtc: pcf85063: add i2c_device_id name matching support

The pcf85063 driver regsitration currently supports the "compatible"
property type of matching (for DT).

This patch adds "matching by name" support to the driver by defining
an i2c_device_id table and setting the id_table parameter in the
i2c_driver struct.

This will, for example, make the driver easier to instantiate on
systems where CONFIG_OF is not enabled (x86 in my case).
Signed-off-by: Marc Ferland <ferlandm@amotus.ca>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20211116164733.17149-1-ferlandm@amotus.ca

drivers/rtc/rtc-pcf85063.c

@@ -514,21 +514,56 @@ static struct clk *pcf85063_clkout_register_clk(struct pcf85063 *pcf85063)
 }
 #endif
 
-static const struct pcf85063_config pcf85063tp_config = {
-	.regmap = {
-		.reg_bits = 8,
-		.val_bits = 8,
-		.max_register = 0x0a,
+enum pcf85063_type {
+	PCF85063,
+	PCF85063TP,
+	PCF85063A,
+	RV8263,
+	PCF85063_LAST_ID
+};
+
+static struct pcf85063_config pcf85063_cfg[] = {
+	[PCF85063] = {
+		.regmap = {
+			.reg_bits = 8,
+			.val_bits = 8,
+			.max_register = 0x0a,
+		},
+	},
+	[PCF85063TP] = {
+		.regmap = {
+			.reg_bits = 8,
+			.val_bits = 8,
+			.max_register = 0x0a,
+		},
+	},
+	[PCF85063A] = {
+		.regmap = {
+			.reg_bits = 8,
+			.val_bits = 8,
+			.max_register = 0x11,
+		},
+		.has_alarms = 1,
+	},
+	[RV8263] = {
+		.regmap = {
+			.reg_bits = 8,
+			.val_bits = 8,
+			.max_register = 0x11,
+		},
+		.has_alarms = 1,
+		.force_cap_7000 = 1,
 	},
 };
 
+static const struct i2c_device_id pcf85063_ids[];
+
 static int pcf85063_probe(struct i2c_client *client)
 {
 	struct pcf85063 *pcf85063;
 	unsigned int tmp;
 	int err;
-	const struct pcf85063_config *config = &pcf85063tp_config;
-	const void *data = of_device_get_match_data(&client->dev);
+	const struct pcf85063_config *config;
 	struct nvmem_config nvmem_cfg = {
 		.name = "pcf85063_nvram",
 		.reg_read = pcf85063_nvmem_read,
@@ -544,8 +579,17 @@ static int pcf85063_probe(struct i2c_client *client)
 	if (!pcf85063)
 		return -ENOMEM;
 
-	if (data)
-		config = data;
+	if (client->dev.of_node) {
+		config = of_device_get_match_data(&client->dev);
+		if (!config)
+			return -ENODEV;
+	} else {
+		enum pcf85063_type type =
+			i2c_match_id(pcf85063_ids, client)->driver_data;
+		if (type >= PCF85063_LAST_ID)
+			return -ENODEV;
+		config = &pcf85063_cfg[type];
+	}
 
 	pcf85063->regmap = devm_regmap_init_i2c(client, &config->regmap);
 	if (IS_ERR(pcf85063->regmap))
@@ -604,31 +648,21 @@ static int pcf85063_probe(struct i2c_client *client)
 	return devm_rtc_register_device(pcf85063->rtc);
 }
 
-#ifdef CONFIG_OF
-static const struct pcf85063_config pcf85063a_config = {
-	.regmap = {
-		.reg_bits = 8,
-		.val_bits = 8,
-		.max_register = 0x11,
-	},
-	.has_alarms = 1,
-};
-
-static const struct pcf85063_config rv8263_config = {
-	.regmap = {
-		.reg_bits = 8,
-		.val_bits = 8,
-		.max_register = 0x11,
-	},
-	.has_alarms = 1,
-	.force_cap_7000 = 1,
+static const struct i2c_device_id pcf85063_ids[] = {
+	{ "pcf85063", PCF85063 },
+	{ "pcf85063tp", PCF85063TP },
+	{ "pcf85063a", PCF85063A },
+	{ "rv8263", RV8263 },
+	{}
 };
+MODULE_DEVICE_TABLE(i2c, pcf85063_ids);
 
+#ifdef CONFIG_OF
 static const struct of_device_id pcf85063_of_match[] = {
-	{ .compatible = "nxp,pcf85063", .data = &pcf85063tp_config },
-	{ .compatible = "nxp,pcf85063tp", .data = &pcf85063tp_config },
-	{ .compatible = "nxp,pcf85063a", .data = &pcf85063a_config },
-	{ .compatible = "microcrystal,rv8263", .data = &rv8263_config },
+	{ .compatible = "nxp,pcf85063", .data = &pcf85063_cfg[PCF85063] },
+	{ .compatible = "nxp,pcf85063tp", .data = &pcf85063_cfg[PCF85063TP] },
+	{ .compatible = "nxp,pcf85063a", .data = &pcf85063_cfg[PCF85063A] },
+	{ .compatible = "microcrystal,rv8263", .data = &pcf85063_cfg[RV8263] },
 	{}
 };
 MODULE_DEVICE_TABLE(of, pcf85063_of_match);
@@ -640,6 +674,7 @@ static struct i2c_driver pcf85063_driver = {
 		.of_match_table = of_match_ptr(pcf85063_of_match),
 	},
 	.probe_new	= pcf85063_probe,
+	.id_table	= pcf85063_ids,
 };
 
 module_i2c_driver(pcf85063_driver);