linux-kernel - [PATCH 2/2] drm/bridge: it66121: Add it66122 support

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Message-ID: <20250813190835.344563-3-nm@ti.com>
Date: Wed, 13 Aug 2025 14:08:35 -0500
From: Nishanth Menon <nm@...com>
To: Conor Dooley <conor+dt@...nel.org>,
        Krzysztof Kozlowski
	<krzk+dt@...nel.org>,
        Rob Herring <robh@...nel.org>, David Airlie
	<airlied@...il.com>,
        Maxime Ripard <mripard@...nel.org>,
        Laurent Pinchart
	<Laurent.pinchart@...asonboard.com>,
        Neil Armstrong
	<neil.armstrong@...aro.org>
CC: <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>,
        Robert Nelson <robertcnelson@...il.com>,
        Jason Kridner <jkridner@...gleboard.org>, Nishanth Menon <nm@...com>
Subject: [PATCH 2/2] drm/bridge: it66121: Add it66122 support

The IT66122 is a drop in replacement for the IT66122. The part is
register compatible with what we use of the IT66121. The only relevant
change being the PID is now 0x0622 vs 0x0612. Add this extra PID so
probe does not fail during the PID check with these new parts.

Signed-off-by: Nishanth Menon <nm@...com>
---

Note: checkpatch --strict reports:
CHECK: No space is necessary after a cast
#45: FILE: drivers/gpu/drm/bridge/ite-it66121.c:1643:
+	{ "it66122", (kernel_ulong_t) &it66122_chip_info },

I chose to retain existing style - let me know if we want to clean this
up as well.

NOTE: .id = ID_IT66121 is explicitly used as indication of reuse of
existing it66121 compatibility.

 drivers/gpu/drm/bridge/ite-it66121.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/bridge/ite-it66121.c b/drivers/gpu/drm/bridge/ite-it66121.c
index aa7b1dcc5d70..329fa47a5701 100644
--- a/drivers/gpu/drm/bridge/ite-it66121.c
+++ b/drivers/gpu/drm/bridge/ite-it66121.c
@@ -1618,6 +1618,12 @@ static const struct it66121_chip_info it66121_chip_info = {
 	.pid = 0x0612,
 };
 
+static const struct it66121_chip_info it66122_chip_info = {
+	.id = ID_IT66121,
+	.vid = 0x4954,
+	.pid = 0x0622,
+};
+
 static const struct it66121_chip_info it6610_chip_info = {
 	.id = ID_IT6610,
 	.vid = 0xca00,
@@ -1626,6 +1632,7 @@ static const struct it66121_chip_info it6610_chip_info = {
 
 static const struct of_device_id it66121_dt_match[] = {
 	{ .compatible = "ite,it66121", &it66121_chip_info },
+	{ .compatible = "ite,it66122", &it66122_chip_info },
 	{ .compatible = "ite,it6610", &it6610_chip_info },
 	{ }
 };
@@ -1633,6 +1640,7 @@ MODULE_DEVICE_TABLE(of, it66121_dt_match);
 
 static const struct i2c_device_id it66121_id[] = {
 	{ "it66121", (kernel_ulong_t) &it66121_chip_info },
+	{ "it66122", (kernel_ulong_t) &it66122_chip_info },
 	{ "it6610", (kernel_ulong_t) &it6610_chip_info },
 	{ }
 };
-- 
2.47.0