Re: [PATCH 12/14] doc: dt: fsl-imx-esdhc: add auto-cmd23-broken binding

[Rob Herring <robh@kernel.org>]

On Fri, Nov 15, 2019 at 07:16:46PM +0800, haibo.chen@nxp.com wrote:
> From: Haibo Chen <haibo.chen@nxp.com>
> 
> Add fsl,auto-cmd23-broken binding.
> 
> Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
> ---
>  Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.txt | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.txt b/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.txt
> index d50144f5f1d2..a776f418a028 100644
> --- a/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.txt
> +++ b/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.txt
> @@ -43,6 +43,14 @@ Optional properties:
>    property allows user to change the delay target for the strobe input read clock.
>    If not use this property, driver default set the delay target to value 7.
>    Only eMMC HS400 mode need to take care of this property.
> +- fsl,auto-cmd23-broken: disable the ACMD23 function of USDHC.
> +  This is required for eMMC on imx6qpdl/imx6sx/imx7d when it use ADMA mode. Because
> +  for these SoC, it do not support the ACMD23 completely, only take the 16 bit block
> +  count from the 0x4 register (BLK_ATT) as argument for the ACMD23, the upper 16 bit
> +  of the CMD23's argument is ignored. This will impact the reliable write operation
> +  and the RPMB block write operation, because these operations need to set the bit 31
> +  of the CMD23's argument. SDMA mode will default disable the ACMD23 mode. SD card do
> +  not has this limitation on these SoCs.

Use the compatible string or perhaps the version register like the 
sdhci-esdhc driver does.

Rob