From: Sarthak Garg <quic_sartgarg@quicinc.com>
Date: Mon, 8 Sep 2025 10:41:20 +0000 (+0530)
Subject: dt-bindings: mmc: controller: Add max-sd-hs-hz property
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=98682689a1a443067e1981d9eed8c6ddcef8cdf3;p=users%2Fhch%2Fmisc.git

dt-bindings: mmc: controller: Add max-sd-hs-hz property

Introduce a new optional device tree property max-sd-hs-hz to
limit the maximum frequency (in Hz) used for SD cards operating in
High-Speed (HS) mode due to any board electrical limitations.

Signed-off-by: Sarthak Garg <quic_sartgarg@quicinc.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
---

diff --git a/Documentation/devicetree/bindings/mmc/mmc-controller-common.yaml b/Documentation/devicetree/bindings/mmc/mmc-controller-common.yaml
index 9a7235439759..7414d5522dfe 100644
--- a/Documentation/devicetree/bindings/mmc/mmc-controller-common.yaml
+++ b/Documentation/devicetree/bindings/mmc/mmc-controller-common.yaml
@@ -93,6 +93,14 @@ properties:
     minimum: 400000
     maximum: 384000000
 
+  max-sd-hs-hz:
+    description: |
+      Maximum frequency (in Hz) to be used for SD cards operating in
+      High-Speed (HS) mode.
+    minimum: 400000
+    maximum: 50000000
+    default: 50000000
+
   disable-wp:
     $ref: /schemas/types.yaml#/definitions/flag
     description: