diff mbox series

[v3,1/2] dt-bindings: mmc: mtk-sd: add hs400 dly3 setting

Message ID 20210908013218.29702-2-wenbin.mei@mediatek.com (mailing list archive)
State New, archived
Headers show
Series mmc: mediatek: Add HS400 online tuning support | expand

Commit Message

Wenbin Mei (梅文彬) Sept. 8, 2021, 1:32 a.m. UTC 
Add hs400 dly3 setting for mtk-sd yaml

Signed-off-by: Wenbin Mei <wenbin.mei@mediatek.com>
Acked-by: Rob Herring <robh@kernel.org>
---
 Documentation/devicetree/bindings/mmc/mtk-sd.yaml | 12 ++++++++++++
 1 file changed, 12 insertions(+)

Comments

Linus Walleij Sept. 16, 2021, 11:32 p.m. UTC | #1 
On Wed, Sep 8, 2021 at 3:32 AM Wenbin Mei <wenbin.mei@mediatek.com> wrote:

> Add hs400 dly3 setting for mtk-sd yaml
>
> Signed-off-by: Wenbin Mei <wenbin.mei@mediatek.com>
> Acked-by: Rob Herring <robh@kernel.org>

Excellent doc!
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

Yours,
Linus Walleij
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/mmc/mtk-sd.yaml b/Documentation/devicetree/bindings/mmc/mtk-sd.yaml
index e866e985549e..82768a807294 100644
--- a/Documentation/devicetree/bindings/mmc/mtk-sd.yaml
+++ b/Documentation/devicetree/bindings/mmc/mtk-sd.yaml
@@ -119,6 +119,18 @@  properties:
       If present, HS400 command responses are sampled on rising edges.
       If not present, HS400 command responses are sampled on falling edges.
 
+  mediatek,hs400-ds-dly3:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Gear of the third delay line for DS for input data latch in data
+      pad macro, there are 32 stages from 0 to 31.
+      For different corner IC, the time is different about one step, it is
+      about 100ps.
+      The value is confirmed by doing scan and calibration to find a best
+      value with corner IC and it is valid only for HS400 mode.
+    minimum: 0
+    maximum: 31
+
   mediatek,latch-ck:
     $ref: /schemas/types.yaml#/definitions/uint32
     description: