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

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Message-ID: <1597110443.22273.5.camel@mtksdaap41>
Date:   Tue, 11 Aug 2020 09:47:23 +0800
From:   Yingjoe Chen <yingjoe.chen@...iatek.com>
To:     Fengping Yu <fengping.yu@...iatek.com>
CC:     Rob Herring <robh+dt@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.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, 2020-08-10 at 14:40 +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

<...>


> +  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.
> +
> +  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.

Your source code can't really handle dts without rows/columns
properties. Also, the default value doesn't make any sense. No IC will
have rows or columns set to 1.

Since these are IC specified, not board specified, I think you should
just have the correct numbers in driver.

Joe.C