linux-kernel - Re: [PATCH 3/8] dt-bindings: nvmem: sfp: Add TA_PROG

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Message-ID: <YmHTwPsZ2QNoFmAF@lunn.ch>
Date:   Thu, 21 Apr 2022 23:59:28 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Sean Anderson <sean.anderson@...o.com>
Cc:     linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        Shawn Guo <shawnguo@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Michael Walle <michael@...le.cc>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Li Yang <leoyang.li@....com>, linux-kernel@...r.kernel.org,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: Re: [PATCH 3/8] dt-bindings: nvmem: sfp: Add TA_PROG_SFP supply

On Thu, Apr 21, 2022 at 01:56:52PM -0400, Sean Anderson wrote:
> The TA_PROG_SFP supply must be enabled to program the fuses, and
> disabled to read the fuses (such as at power-on-reset). On many boards,
> this supply is controlled by a jumper. The user must manually insert or
> remove it at the appropriate time in the programming process. However,
> on other boards this supply is controlled by and FPGA or a GPIO. In
> these cases, the driver can automatically enabled and disable it as
> necessary.
> 
> Signed-off-by: Sean Anderson <sean.anderson@...o.com>
> ---
> 
>  .../devicetree/bindings/nvmem/fsl,layerscape-sfp.yaml        | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/nvmem/fsl,layerscape-sfp.yaml b/Documentation/devicetree/bindings/nvmem/fsl,layerscape-sfp.yaml
> index 54086f50157d..e7d1232fcd41 100644
> --- a/Documentation/devicetree/bindings/nvmem/fsl,layerscape-sfp.yaml
> +++ b/Documentation/devicetree/bindings/nvmem/fsl,layerscape-sfp.yaml
> @@ -32,6 +32,11 @@ properties:
>    clock-names:
>      const: sfp
>  
> +  ta-prog-sfp-supply:
> +    description:
> +      The TA_PROG_SFP supply. It will be enabled for programming and disabled
> +      for reading.
> +

Doesn't there need to be some indication what this is? Is it a GPIO,
or maybe a regulator?

   Andrew