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From: Rob Herring <robh@kernel.org>
To: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Cc: Joakim Zhang <qiangqing.zhang@nxp.com>,
	shawnguo@kernel.org, kernel@pengutronix.de, linux-imx@nxp.com,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH V1 1/4] bindings: nvmem: introduce "reverse-data" property
Date: Tue, 17 Aug 2021 14:58:00 -0500	[thread overview]
Message-ID: <YRwUyLsvoSpFI9X8@robh.at.kernel.org> (raw)
In-Reply-To: <6e3f6881-929d-1663-58f1-39bf35069175@linaro.org>

On Wed, Aug 11, 2021 at 11:16:49AM +0100, Srinivas Kandagatla wrote:
> 
> 
> On 10/08/2021 08:35, Joakim Zhang wrote:
> > Introduce "reverse-data" property for nvmem provider to reverse buffer.
> > 
> > Signed-off-by: Joakim Zhang <qiangqing.zhang@nxp.com>
> > ---
> >   Documentation/devicetree/bindings/nvmem/nvmem.yaml | 5 +++++
> >   1 file changed, 5 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/nvmem/nvmem.yaml b/Documentation/devicetree/bindings/nvmem/nvmem.yaml
> > index b8dc3d2b6e92..bc745083fc64 100644
> > --- a/Documentation/devicetree/bindings/nvmem/nvmem.yaml
> > +++ b/Documentation/devicetree/bindings/nvmem/nvmem.yaml
> > @@ -61,6 +61,11 @@ patternProperties:
> >                 description:
> >                   Size in bit within the address range specified by reg.
> > +      reverse-data:
> > +        $ref: /schemas/types.yaml#/definitions/flag
> > +        description:
> > +          Reverse the data that read from the storage device.
> > +
> 
> This new property is only going to solve one of the reverse order issue
> here.
> If I remember correctly we have mac-address stored in various formats ex:
> from old thread I can see
> 
> Type 1: Octets in ASCII without delimiters. (Swapped/non-Swapped)
> Type 2: Octets in ASCII with delimiters like (":", ",", ".", "-"... so on)
> (Swapped/non-Swapped)
> Type 3: Is the one which stores mac address in Type1/2 but this has to be
> incremented to be used on other instances of eth.
> Type 4: Octets as bytes/u8, swapped/non-swapped
> 
> I think its right time to consider adding compatibles to nvmem-cells to be
> able to specify encoding information and handle post processing.

Yes. Trying to handle this with never ending new properties will end up 
with a mess. At some point, you just need code to parse the data.

Rob

  reply	other threads:[~2021-08-17 19:58 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-10  7:35 [PATCH V1 0/4] " Joakim Zhang
2021-08-10  7:35 ` [PATCH V1 1/4] bindings: " Joakim Zhang
2021-08-10 15:14   ` Jan Lübbe
2021-08-11  8:05     ` Joakim Zhang
2021-08-11  8:06       ` Joakim Zhang
2021-08-11  9:05         ` Jan Lübbe
2021-08-11 10:16   ` Srinivas Kandagatla
2021-08-17 19:58     ` Rob Herring [this message]
2021-08-18  7:54       ` Joakim Zhang
2021-08-24  6:31         ` Joakim Zhang
2021-09-03 12:37         ` Srinivas Kandagatla
2021-09-06  8:58           ` Joakim Zhang
2021-09-07 10:11             ` Srinivas Kandagatla
2021-09-08  7:14               ` Joakim Zhang
2021-09-08  8:48                 ` Srinivas Kandagatla
2021-09-08  8:57                   ` Joakim Zhang
2021-09-08  9:21                     ` Srinivas Kandagatla
2021-08-10  7:35 ` [PATCH V1 2/4] nvmem: core: introduce "reverse-data" property to reverse buffer Joakim Zhang
2021-08-11  9:52   ` Srinivas Kandagatla
2021-08-11 10:16     ` Joakim Zhang
2021-08-10  7:35 ` [PATCH V1 3/4] arm64: dts: imx8m: add "reverse-data" property for MAC ocopt Joakim Zhang
2021-08-10  7:35 ` [PATCH V1 4/4] arm64: dts: imx8m: remove unused "nvmem_macaddr_swap" property for FEC Joakim Zhang

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