linux-kernel - [PATCH v2 01/10] dt-bindings: HID: i2c-hid: Add "panel" property to i2c-hid backed touchscreens

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Message-ID: <20230607144931.v2.1.Id68e30343bb1e11470582a9078b086176cfec46b@changeid>
Date:   Wed,  7 Jun 2023 14:49:23 -0700
From:   Douglas Anderson <dianders@...omium.org>
To:     Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Sam Ravnborg <sam@...nborg.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>
Cc:     dri-devel@...ts.freedesktop.org,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        linux-input@...r.kernel.org, Daniel Vetter <daniel@...ll.ch>,
        linux-kernel@...r.kernel.org, hsinyi@...gle.com,
        cros-qcom-dts-watchers@...omium.org, devicetree@...r.kernel.org,
        yangcong5@...qin.corp-partner.google.com,
        linux-arm-msm@...r.kernel.org,
        Chris Morgan <macroalpha82@...il.com>,
        Douglas Anderson <dianders@...omium.org>
Subject: [PATCH v2 01/10] dt-bindings: HID: i2c-hid: Add "panel" property to i2c-hid backed touchscreens

As talked about in the patch ("drm/panel: Add a way for other devices
to follow panel state"), touchscreens that are connected to panels are
generally expected to be power sequenced together with the panel
they're attached to. Today, nothing provides information allowing you
to find out that a touchscreen is connected to a panel. Let's add a
phandle for this.

The proerty is added to the generic touchscreen bindings and then
enabled in the bindings for the i2c-hid backed devices. This can and
should be added for other touchscreens in the future, but for now
let's start small.

Signed-off-by: Douglas Anderson <dianders@...omium.org>
---

Changes in v2:
- Move the description to the generic touchscreen.yaml.
- Update the desc to make it clearer it's only for integrated devices.

 Documentation/devicetree/bindings/input/elan,ekth6915.yaml | 5 +++++
 .../devicetree/bindings/input/goodix,gt7375p.yaml          | 5 +++++
 Documentation/devicetree/bindings/input/hid-over-i2c.yaml  | 2 ++
 .../devicetree/bindings/input/touchscreen/touchscreen.yaml | 7 +++++++
 4 files changed, 19 insertions(+)

diff --git a/Documentation/devicetree/bindings/input/elan,ekth6915.yaml b/Documentation/devicetree/bindings/input/elan,ekth6915.yaml
index 05e6f2df604c..3e2d216c6432 100644
--- a/Documentation/devicetree/bindings/input/elan,ekth6915.yaml
+++ b/Documentation/devicetree/bindings/input/elan,ekth6915.yaml
@@ -13,6 +13,9 @@ description:
   Supports the Elan eKTH6915 touchscreen controller.
   This touchscreen controller uses the i2c-hid protocol with a reset GPIO.
 
+allOf:
+  - $ref: /schemas/input/touchscreen/touchscreen.yaml#
+
 properties:
   compatible:
     items:
@@ -24,6 +27,8 @@ properties:
   interrupts:
     maxItems: 1
 
+  panel: true
+
   reset-gpios:
     description: Reset GPIO; not all touchscreens using eKTH6915 hook this up.
 
diff --git a/Documentation/devicetree/bindings/input/goodix,gt7375p.yaml b/Documentation/devicetree/bindings/input/goodix,gt7375p.yaml
index ce18d7dadae2..72212382d702 100644
--- a/Documentation/devicetree/bindings/input/goodix,gt7375p.yaml
+++ b/Documentation/devicetree/bindings/input/goodix,gt7375p.yaml
@@ -14,6 +14,9 @@ description:
   This touchscreen uses the i2c-hid protocol but has some non-standard
   power sequencing required.
 
+allOf:
+  - $ref: /schemas/input/touchscreen/touchscreen.yaml#
+
 properties:
   compatible:
     oneOf:
@@ -30,6 +33,8 @@ properties:
   interrupts:
     maxItems: 1
 
+  panel: true
+
   reset-gpios:
     true
 
diff --git a/Documentation/devicetree/bindings/input/hid-over-i2c.yaml b/Documentation/devicetree/bindings/input/hid-over-i2c.yaml
index 7156b08f7645..138caad96a29 100644
--- a/Documentation/devicetree/bindings/input/hid-over-i2c.yaml
+++ b/Documentation/devicetree/bindings/input/hid-over-i2c.yaml
@@ -44,6 +44,8 @@ properties:
     description: HID descriptor address
     $ref: /schemas/types.yaml#/definitions/uint32
 
+  panel: true
+
   post-power-on-delay-ms:
     description: Time required by the device after enabling its regulators
       or powering it on, before it is ready for communication.
diff --git a/Documentation/devicetree/bindings/input/touchscreen/touchscreen.yaml b/Documentation/devicetree/bindings/input/touchscreen/touchscreen.yaml
index 895592da9626..431c13335c40 100644
--- a/Documentation/devicetree/bindings/input/touchscreen/touchscreen.yaml
+++ b/Documentation/devicetree/bindings/input/touchscreen/touchscreen.yaml
@@ -10,6 +10,13 @@ maintainers:
   - Dmitry Torokhov <dmitry.torokhov@...il.com>
 
 properties:
+  panel:
+    description: If this touchscreen is integrally connected to a panel, this
+      is a reference to that panel. The presence of this reference indicates
+      that the touchscreen should be power sequenced together with the panel
+      and that they may share power and/or reset signals.
+    $ref: /schemas/types.yaml#/definitions/phandle
+
   touchscreen-min-x:
     description: minimum x coordinate reported
     $ref: /schemas/types.yaml#/definitions/uint32
-- 
2.41.0.162.gfafddb0af9-goog