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 <nm@ti.com>
Reviewed-by: Andrew Davis <afd@ti.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patch.msgid.link/20251029150636.3118628-6-nm@ti.com

diff --git a/drivers/gpu/drm/bridge/ite-it66121.c b/drivers/gpu/drm/bridge/ite-it66121.c
index 1b2ef774c7703208c7b31dc9fce42f4ca88cc469..0185f61e6e59ae10a0dcfac7617dab0345e84260 100644 (file)
--- a/drivers/gpu/drm/bridge/ite-it66121.c
+++ b/drivers/gpu/drm/bridge/ite-it66121.c
@@ -287,6 +287,7 @@
 enum chip_id {
        ID_IT6610,
        ID_IT66121,
+       ID_IT66122,
 };
 
 struct it66121_chip_info {
@@ -402,7 +403,7 @@ static int it66121_configure_afe(struct it66121_ctx *ctx,
                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)
@@ -428,7 +429,7 @@ static int it66121_configure_afe(struct it66121_ctx *ctx,
                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);
@@ -599,7 +600,7 @@ static int it66121_bridge_attach(struct drm_bridge *bridge,
        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)
@@ -802,7 +803,7 @@ void it66121_bridge_mode_set(struct drm_bridge *bridge,
        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)) {
@@ -815,7 +816,7 @@ void it66121_bridge_mode_set(struct drm_bridge *bridge,
        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;
@@ -1501,6 +1502,7 @@ static const char * const it66121_supplies[] = {
 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)
@@ -1621,6 +1623,7 @@ static void it66121_remove(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);
@@ -1628,6 +1631,7 @@ 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);