diff mbox series

[v2,1/3] dt-bindings: mmc: add no-mmc-hs400 flag

Message ID 20210510190400.105162-1-l.stach@pengutronix.de (mailing list archive)
State New, archived
Headers show
Series [v2,1/3] dt-bindings: mmc: add no-mmc-hs400 flag | expand

Commit Message

Lucas Stach May 10, 2021, 7:03 p.m. UTC 
From: Lucas Stach <dev@lynxeye.de>

HS400 requires a data strobe line in addition to the usual MMC signal
lines. If a board design neglects to wire up this signal, HS400 mode is
not available, even if both the controller and the eMMC are claiming to
support this mode. Add a DT flag to allow boards to disable the HS400
support in this case.

Signed-off-by: Lucas Stach <dev@lynxeye.de>
Acked-by: Rob Herring <robh@kernel.org>
---
 Documentation/devicetree/bindings/mmc/mmc-controller.yaml | 5 +++++
 1 file changed, 5 insertions(+)

Comments

Ulf Hansson May 24, 2021, 2:10 p.m. UTC | #1 
On Mon, 10 May 2021 at 21:04, Lucas Stach <l.stach@pengutronix.de> wrote:
>
> From: Lucas Stach <dev@lynxeye.de>
>
> HS400 requires a data strobe line in addition to the usual MMC signal
> lines. If a board design neglects to wire up this signal, HS400 mode is
> not available, even if both the controller and the eMMC are claiming to
> support this mode. Add a DT flag to allow boards to disable the HS400
> support in this case.
>
> Signed-off-by: Lucas Stach <dev@lynxeye.de>
> Acked-by: Rob Herring <robh@kernel.org>

Applied for next, thanks!

Kind regards
Uffe


> ---
>  Documentation/devicetree/bindings/mmc/mmc-controller.yaml | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/mmc/mmc-controller.yaml b/Documentation/devicetree/bindings/mmc/mmc-controller.yaml
> index e141330c1114..ac80d09df3a9 100644
> --- a/Documentation/devicetree/bindings/mmc/mmc-controller.yaml
> +++ b/Documentation/devicetree/bindings/mmc/mmc-controller.yaml
> @@ -220,6 +220,11 @@ properties:
>      description:
>        eMMC HS400 enhanced strobe mode is supported
>
> +  no-mmc-hs400:
> +    $ref: /schemas/types.yaml#/definitions/flag
> +    description:
> +      All eMMC HS400 modes are not supported.
> +
>    dsr:
>      description:
>        Value the card Driver Stage Register (DSR) should be programmed
> --
> 2.31.1
>
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/mmc/mmc-controller.yaml b/Documentation/devicetree/bindings/mmc/mmc-controller.yaml
index e141330c1114..ac80d09df3a9 100644
--- a/Documentation/devicetree/bindings/mmc/mmc-controller.yaml
+++ b/Documentation/devicetree/bindings/mmc/mmc-controller.yaml
@@ -220,6 +220,11 @@  properties:
     description:
       eMMC HS400 enhanced strobe mode is supported
 
+  no-mmc-hs400:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      All eMMC HS400 modes are not supported.
+
   dsr:
     description:
       Value the card Driver Stage Register (DSR) should be programmed