linux-kernel - Re: [PATCH 3/3] spi: dt-bindings: Add wait state polling flag

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Message-ID: <Yjt/UDlkE9ciA4Yt@robh.at.kernel.org>
Date:   Wed, 23 Mar 2022 15:13:04 -0500
From:   Rob Herring <robh@...nel.org>
To:     Krishna Yarlagadda <kyarlagadda@...dia.com>
Cc:     broonie@...nel.org, thierry.reding@...il.com, jonathanh@...dia.com,
        linux-spi@...r.kernel.org, linux-tegra@...r.kernel.org,
        ashishsingha@...dia.com, skomatineni@...dia.com,
        ldewangan@...dia.com, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] spi: dt-bindings: Add wait state polling flag

On Thu, Mar 17, 2022 at 06:50:06AM +0530, Krishna Yarlagadda wrote:
> Add flag to enable tpm wait state polling and Tegra Grace binding.

TPM

> 
> Signed-off-by: Krishna Yarlagadda <kyarlagadda@...dia.com>
> ---
>  .../devicetree/bindings/spi/nvidia,tegra210-quad.yaml       | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/spi/nvidia,tegra210-quad.yaml b/Documentation/devicetree/bindings/spi/nvidia,tegra210-quad.yaml
> index 0296edd1de22..88b00fcad210 100644
> --- a/Documentation/devicetree/bindings/spi/nvidia,tegra210-quad.yaml
> +++ b/Documentation/devicetree/bindings/spi/nvidia,tegra210-quad.yaml
> @@ -20,6 +20,7 @@ properties:
>        - nvidia,tegra186-qspi
>        - nvidia,tegra194-qspi
>        - nvidia,tegra234-qspi
> +      - nvidia,tegra-grace-qspi
>  
>    reg:
>      maxItems: 1
> @@ -57,6 +58,11 @@ patternProperties:
>        spi-tx-bus-width:
>          enum: [1, 2, 4]
>  
> +      nvidia,wait-polling:
> +        description:
> +          Enable TPM wait state polling on supported chips.

What's TPM?

Why is this not implied by the compatible string?

Also, how child node properties are handled has changed. See 
Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml. The 
NVidia specific properties should be refactored first before adding 
more.

> +	type: boolean
> +
>        nvidia,tx-clk-tap-delay:
>          description:
>            Delays the clock going out to device with this tap value.
> -- 
> 2.17.1
> 
>