Re: [RFC PATCH v1] dt-bindings: mmc: snps,dwcmshc-sdhci: fix rockchip,txclk-tapnum
From: Rob Herring
Date: Mon May 03 2021 - 18:41:11 EST
On Fri, Apr 30, 2021 at 2:21 AM Johan Jonker <jbx6244@xxxxxxxxx> wrote:
> A test with the command below gives this error:
> mmc@fe310000: rockchip,txclk-tapnum: missing size tag in []
> With this added to a dts file:
> rockchip,txclk-tapnum = <0x8>;
> A look at the driver shows that:
> DLL_TXCLK_TAPNUM_DEFAULT 0x8
> Adding the default value to the dts files is not needed.
> Every clock is divided into 32 taps equally and
> the max value is 31.
> Fix rockchip,txclk-tapnum property in snps,dwcmshc-sdhci.yaml by
> adding a minimum, maximum and default.
> In the driver the function of_property_read_u8() is used,
> but with dtbs_check the notifications only disappear in YAML
> by changing uint8 to uint32.
Did you check what value the driver sees when you put 8 in the dts. I
expect it will be 0 because you are reading the 1st byte in big
> The driver has no limit check for rockchip,txclk-tapnum.
> make ARCH=arm64 dtbs_check
> Signed-off-by: Johan Jonker <jbx6244@xxxxxxxxx>
> Documentation/devicetree/bindings/mmc/snps,dwcmshc-sdhci.yaml | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
> diff --git a/Documentation/devicetree/bindings/mmc/snps,dwcmshc-sdhci.yaml b/Documentation/devicetree/bindings/mmc/snps,dwcmshc-sdhci.yaml
> index e6c9a2f77..f43d8d829 100644
> --- a/Documentation/devicetree/bindings/mmc/snps,dwcmshc-sdhci.yaml
> +++ b/Documentation/devicetree/bindings/mmc/snps,dwcmshc-sdhci.yaml
> @@ -48,7 +48,10 @@ properties:
> description: Specify the number of delay for tx sampling.
> - $ref: /schemas/types.yaml#/definitions/uint8
> + $ref: /schemas/types.yaml#/definitions/uint32
> + minimum: 0
> + maximum: 31
> + default: 8