linux-kernel - [PATCH V2 1/2] dt-bindings: input: Introduce Himax HID-over-SPI device

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20230919024943.3088916-2-tylor_yang@himax.corp-partner.google.com>
Date:   Tue, 19 Sep 2023 10:49:42 +0800
From:   Tylor Yang <tylor_yang@...ax.corp-partner.google.com>
To:     dmitry.torokhov@...il.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        jikos@...nel.org, benjamin.tissoires@...hat.com,
        linux-input@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     poyuan_chang@...ax.corp-partner.google.com, jingliang@...omium.org,
        hbarnor@...omium.org,
        Tylor Yang <tylor_yang@...ax.corp-partner.google.com>
Subject: [PATCH V2 1/2] dt-bindings: input: Introduce Himax HID-over-SPI device

The Himax HID-over-SPI framework support for Himax touchscreen ICs
that report HID packet through SPI bus. The driver core need reset
 pin to meet reset timing spec. of IC. An interrupt pin to disable
and enable interrupt when suspend/resume. An optional power control
pin if target board needed. Panel id pins for identify panel is also
an option.

Additional optional arguments:
ic-det-delay-ms and ic-resume-delay-ms are using to solve runtime
conditions.

This patch also add maintainer of this driver.

Signed-off-by: Tylor Yang <tylor_yang@...ax.corp-partner.google.com>
---
 .../bindings/input/himax,hid-over-spi.yaml    | 109 ++++++++++++++++++
 MAINTAINERS                                   |   6 +
 2 files changed, 115 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/input/himax,hid-over-spi.yaml

diff --git a/Documentation/devicetree/bindings/input/himax,hid-over-spi.yaml b/Documentation/devicetree/bindings/input/himax,hid-over-spi.yaml
new file mode 100644
index 000000000000..3ee3a89842ac
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/himax,hid-over-spi.yaml
@@ -0,0 +1,109 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/input/himax,hid-over-spi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Himax TDDI devices using SPI to send HID packets
+
+maintainers:
+  - Tylor Yang <tylor_yang@...ax.corp-partner.google.com>
+
+description: |
+  Support the Himax TDDI devices which using SPI interface to acquire
+  HID packets from the device. The device needs to be initialized using
+  Himax protocol before it start sending HID packets.
+
+properties:
+  compatible:
+    const: himax,hid-over-spi
+
+  reg:
+    maxItems: 1
+
+  '#address-cells':
+    const: 1
+
+  '#size-cells':
+    const: 0
+
+  interrupts:
+    maxItems: 1
+
+  himax,rst-gpio:
+    maxItems: 1
+    description: Reset device, active low signal.
+
+  himax,irq-gpio:
+    maxItems: 1
+    description: Interrupt request, active low signal.
+
+  himax,3v3-gpio:
+    maxItems: 1
+    description: GPIO to control 3.3V power supply.
+
+  himax,id-gpios:
+    maxItems: 8
+    description: GPIOs to read physical Panel ID. Optional.
+
+  spi-cpha: true
+  spi-cpol: true
+
+  himax,ic-det-delay-ms:
+    description:
+      Due to TDDI properties, the TPIC detection timing must after the
+      display panel initialized. This property is used to specify the
+      delay time when TPIC detection and display panel initialization
+      timing are overlapped. How much milliseconds to delay before TPIC
+      detection start.
+
+  himax,ic-resume-delay-ms:
+    description:
+      Due to TDDI properties, the TPIC resume timing must after the
+      display panel resumed. This property is used to specify the
+      delay time when TPIC resume and display panel resume
+      timing are overlapped. How much milliseconds to delay before TPIC
+      resume start.
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - himax,rst-gpio
+  - himax,irq-gpio
+
+unevaluatedProperties: false
+
+allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/gpio/gpio.h>
+
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        touchscreen@0 {
+            compatible = "himax,hid-over-spi";
+            #address-cells = <1>;
+            #size-cells = <0>;
+            reg = <0x0>;
+            interrupt-parent = <&gpio1>;
+            interrupts = <7 IRQ_TYPE_LEVEL_LOW>;
+            pinctrl-0 = <&touch_pins>;
+            pinctrl-names = "default";
+
+            spi-max-frequency = <12500000>;
+            spi-cpha;
+            spi-cpol;
+
+            himax,rst-gpio = <&gpio1 8 GPIO_ACTIVE_LOW>;
+            himax,irq-gpio = <&gpio1 7 GPIO_ACTIVE_LOW>;
+            himax,3v3-gpio = <&gpio1 6 GPIO_ACTIVE_HIGH>;
+            himax,ic-det-delay-ms = <500>;
+            himax,ic-resume-delay-ms = <100>;
+        };
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index bf0f54c24f81..452701261bec 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9323,6 +9323,12 @@ L:	linux-kernel@...r.kernel.org
 S:	Maintained
 F:	drivers/misc/hisi_hikey_usb.c
 
+HIMAX HID OVER SPI TOUCHSCREEN SUPPORT
+M:	Tylor Yang <tylor_yang@...ax.corp-partner.google.com>
+L:	linux-input@...r.kernel.org
+S:	Supported
+F:	Documentation/devicetree/bindings/input/himax,hid-over-spi.yaml
+
 HIMAX HX83112B TOUCHSCREEN SUPPORT
 M:	Job Noorman <job@...rman.info>
 L:	linux-input@...r.kernel.org
-- 
2.25.1