linux-kernel - Re: [PATCH v17 1/3] dt-bindings: Add bindings for Mediatek matrix keypad

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Message-ID: <20200812223711.GT1665100@dtor-ws>
Date:   Wed, 12 Aug 2020 15:37:11 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Fengping Yu <fengping.yu@...iatek.com>
Cc:     Yingjoe Chen <yingjoe.chen@...iatek.com>,
        Rob Herring <robh+dt@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Marco Felsch <m.felsch@...gutronix.de>,
        linux-input@...r.kernel.org, devicetree@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v17 1/3] dt-bindings: Add bindings for Mediatek matrix
 keypad

Hi,

On Mon, Aug 10, 2020 at 02:40:57PM +0800, Fengping Yu wrote:
> From: "fengping.yu" <fengping.yu@...iatek.com>
> 
> This patch add devicetree bindings for Mediatek matrix keypad driver.
> 
> Signed-off-by: fengping.yu <fengping.yu@...iatek.com>
> ---
>  .../devicetree/bindings/input/mtk-kpd.yaml    | 87 +++++++++++++++++++
>  1 file changed, 87 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/input/mtk-kpd.yaml
> 
> diff --git a/Documentation/devicetree/bindings/input/mtk-kpd.yaml b/Documentation/devicetree/bindings/input/mtk-kpd.yaml
> new file mode 100644
> index 000000000000..d74dd8a6fbde
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/mtk-kpd.yaml
> @@ -0,0 +1,87 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +version: 1
> +
> +$id: http://devicetree.org/schemas/input/mtk-keypad.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Mediatek's Keypad Controller device tree bindings
> +
> +maintainer:
> +  - Fengping Yu <fengping.yu@...iatek.com>
> +
> +description: |
> +  Mediatek's Keypad controller is used to interface a SoC with a matrix-type
> +  keypad device. The keypad controller supports multiple row and column lines.
> +  A key can be placed at each intersection of a unique row and a unique column.
> +  The keypad controller can sense a key-press and key-release and report the
> +  event using a interrupt to the cpu.
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - const: "mediatek,mt6779-keypad"
> +      - const: "mediatek,mt6873-keypad"
> +
> +  clock-names:
> +    description: Names of the clocks listed in clocks property in the same order
> +    maxItems: 1
> +    items:
> +    	- const: kpd
> +
> +  clocks:
> +    description: Must contain one entry, for the module clock
> +    refs: devicetree/bindings/clocks/clock-bindings.txt for details.
> +
> +  interrupts:
> +    description: A single interrupt specifier
> +    maxItems: 1
> +
> +  linux,keymap:
> +    description: The keymap for keys as described in the binding document
> +    refs: devicetree/bindings/input/matrix-keymap.txt
> +    minItems: 1
> +
> +  reg:
> +    description: The base address of the Keypad register bank
> +    maxItems: 1
> +
> +  wakeup-source:
> +    description: use any event on keypad as wakeup event
> +    type: boolean
> +
> +  keypad,num-columns:
> +    description: Number of column lines connected to the keypad controller,
> +    it is not equal to PCB columns number, instead you should add required value
> +    for each IC. If not specified, the default value is 1.

What sets the default? matrix_keymap_parse_properties() will error out
if either property is not present....

> +
> +  keypad,num-rows:
> +    description: Number of row lines connected to the keypad controller, it is
> +    not equal to PCB rows number, instead you should add required value for each IC.
> +    If not specified, the default value is 1.
> +
> +  mediatek,debounce-us:
> +    description: Debounce interval in microseconds, if not specified, the default
> +    value is 16000
> +    maximum: 256000
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - linux,keymap
> +  - clocks
> +  - clock-names
> +
> +examples:
> +  - |
> +
> +  kp@...10000 {
> +    compatible = "mediatek,mt6779-keypad";

Should we call the driver mt6779-keypad ?

> +    reg = <0 0x10010000 0 0x1000>;
> +    linux,keymap = < MATRIX_KEY(0x00, 0x00, KEY_VOLUMEDOWN) >;
> +    interrupts = <GIC_SPI 75 IRQ_TYPE_EDGE_FALLING>;
> +    clocks = <&clk26m>;
> +    clock-names = "kpd";
> +  };
> -- 
> 2.18.0

Thanks.

-- 
Dmitry