drm/bridge: it66121: Add minimal it66122 support

The IT66122 is a pin compatible replacement for the IT66122. Based on
empirical testing, the new device looks to be compatible with IT66121.
However due to a lack of public data sheet at this time beyond overall
feature list[1] (which seems to add additional features vs ITT66121),
it is hard to determine that additional register operations required
to enable additional features.

So, introduce the device as a new compatible that we will detect based
on vid/pid match, with explicit id that can be used to extend the
driver capability as information becomes available later on.

[1] https://www.ite.com.tw/en/product/cate1/IT66122

Signed-off-by: Nishanth Menon <[e-mail]>
Reviewed-by: Andrew Davis <[e-mail]>
Reviewed-by: Tomi Valkeinen <[e-mail]>
Signed-off-by: Neil Armstrong <[e-mail]>
Link: https://patch.msgid.link/[e-mail]

drivers/gpu/drm/bridge/ite-it66121.c

···
 enum chip_id {
 	ID_IT6610,
 	ID_IT66121,
+	ID_IT66122,
 };
 
 struct it66121_chip_info {
···
 		if (ret)
 			return ret;
 
-		if (ctx->id == ID_IT66121) {
+		if (ctx->id == ID_IT66121 || ctx->id == ID_IT66122) {
 			ret = regmap_write_bits(ctx->regmap, IT66121_AFE_IP_REG,
 						IT66121_AFE_IP_EC1, 0);
 			if (ret)
···
 		if (ret)
 			return ret;
 
-		if (ctx->id == ID_IT66121) {
+		if (ctx->id == ID_IT66121 || ctx->id == ID_IT66122) {
 			ret = regmap_write_bits(ctx->regmap, IT66121_AFE_IP_REG,
 						IT66121_AFE_IP_EC1,
 						IT66121_AFE_IP_EC1);
···
 	if (ret)
 		return ret;
 
-	if (ctx->id == ID_IT66121) {
+	if (ctx->id == ID_IT66121 || ctx->id == ID_IT66122) {
 		ret = regmap_write_bits(ctx->regmap, IT66121_CLK_BANK_REG,
 					IT66121_CLK_BANK_PWROFF_RCLK, 0);
 		if (ret)
···
 	if (regmap_write(ctx->regmap, IT66121_HDMI_MODE_REG, IT66121_HDMI_MODE_HDMI))
 		goto unlock;
 
-	if (ctx->id == ID_IT66121 &&
+	if ((ctx->id == ID_IT66121 || ctx->id == ID_IT66122) &&
 	    regmap_write_bits(ctx->regmap, IT66121_CLK_BANK_REG,
 			      IT66121_CLK_BANK_PWROFF_TXCLK,
 			      IT66121_CLK_BANK_PWROFF_TXCLK)) {
···
 	if (it66121_configure_afe(ctx, adjusted_mode))
 		goto unlock;
 
-	if (ctx->id == ID_IT66121 &&
+	if ((ctx->id == ID_IT66121 || ctx->id == ID_IT66122) &&
 	    regmap_write_bits(ctx->regmap, IT66121_CLK_BANK_REG,
 			      IT66121_CLK_BANK_PWROFF_TXCLK, 0)) {
 		goto unlock;
···
 static const struct it66121_chip_info it66xx_chip_info[] = {
 	{.id = ID_IT6610, .vid = 0xca00, .pid = 0x0611 },
 	{.id = ID_IT66121, .vid = 0x4954, .pid = 0x0612 },
+	{.id = ID_IT66122, .vid = 0x4954, .pid = 0x0622 },
 };
 
 static int it66121_probe(struct i2c_client *client)
···
 static const struct of_device_id it66121_dt_match[] = {
 	{ .compatible = "ite,it6610" },
 	{ .compatible = "ite,it66121" },
+	{ .compatible = "ite,it66122" },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, it66121_dt_match);
···
 static const struct i2c_device_id it66121_id[] = {
 	{ .name = "it6610" },
 	{ .name = "it66121" },
+	{ .name = "it66122" },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, it66121_id);