linux-kernel - Re: [PATCH v7 1/3] dt-bindings: Add keypad devicetree documentation

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Message-ID: <3d436742-cafc-59c2-40fd-f888a8aa0657@gmail.com>
Date:   Thu, 14 May 2020 12:04:27 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Fengping Yu <fengping.yu@...iatek.com>,
        Yingjoe Chen <yingjoe.chen@...iatek.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Marco Felsch <m.felsch@...gutronix.de>
Cc:     linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v7 1/3] dt-bindings: Add keypad devicetree documentation



On 14/05/2020 08:17, Fengping Yu wrote:
> From: "fengping.yu" <fengping.yu@...iatek.com>
> 
> Add Mediatek matrix keypad dt-binding doc as yaml schema.
> 
> Signed-off-by: fengping.yu <fengping.yu@...iatek.com>
> ---
>  .../devicetree/bindings/input/mtk-kpd.yaml    | 102 ++++++++++++++++++
>  1 file changed, 102 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..8f594fe0bfc2
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/mtk-kpd.yaml
> @@ -0,0 +1,102 @@
> +%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:
> +      constraint: |
> +        "mediatek,mt6779-keypad"
> +        "mediatek, kp"

"mediatek, kp" is too generic. Are you aware that the keypad can be used by
other SoCs. Then we should add them later with a fallback to mt6779-keypad.

Regards,
Matthias

> +
> +    clock-names:
> +	description: Names of the clocks listed in clocks property in the same order
> +
> +    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
> +
> +    linux,keymap:
> +	description: The keymap for keys as described in the binding document
> +	refs: devicetree/bindings/input/matrix-keymap.txt
> +
> +    pinctrl-0:
> +	description: Specify pin control groups used for this controller
> +	refs: devicetree/bindings/pinctrl/pinctrl-bindings.txt
> +
> +    pinctrl-names:
> +	description: Names for optional pin modes
> +
> +    reg:
> +	description: The base address of the Keypad register bank
> +
> +    wakeup-source:
> +	description: use any event on keypad as wakeup event
> +
> +    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
> +
> +    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
> +
> +    mediatek,debounce-us:
> +	description: Debounce interval in microseconds
> +	maximum: 256000
> +
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - mediatek,debounce-us
> +  - keypad,num-rows
> +  - keypad,num-columns
> +  - linux,keymap
> +  - pinctrl
> +  - clocks
> +  - clock-names
> +
> +optional:
> +  - wakeup-source:
> +
> +examples:
> +  - |
> +
> +    keypad: kp@...10000 {
> +	compatible = "mediatek,kp";
> +	reg = <0 0x10010000 0 0x1000>;
> +	wakeup-source;
> +	interrupts = <GIC_SPI 75 IRQ_TYPE_EDGE_FALLING>;
> +	clocks = <&clk26m>;
> +	clock-names = "kpd";
> +    };
> +
> +    &keypad {
> +	mediatek,debounce-us = <32000>;
> +	keypad,num-rows = <8>;
> +	keypad,num-columns = <9>;
> +	linux,keymap = < MATRIX_KEY(0x00, 0x00, KEY_VOLUMEDOWN) >;
> +	status = "okay";
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&kpd_gpios_def_cfg>;
> +    };
>