linux-kernel - [PATCH v2] dt-bindings: mmc: Set maximum documented operating frequency as 384MHz

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Date:   Tue, 26 Jul 2022 14:15:20 +0530
From:   Bhupesh Sharma <bhupesh.sharma@...aro.org>
To:     linux-mmc@...r.kernel.org, devicetree@...r.kernel.org
Cc:     linux-arm-msm@...r.kernel.org, ulf.hansson@...aro.org,
        robh@...nel.org, bhupesh.sharma@...aro.org,
        bhupesh.linux@...il.com, linux-kernel@...r.kernel.org,
        bjorn.andersson@...aro.org, agross@...nel.org
Subject: [PATCH v2] dt-bindings: mmc: Set maximum documented operating frequency as 384MHz

As Ulf noted in [1], the maximum operating frequency
documented in the mmc-controller device-tree bindings
should be updated to the maximum frequency supported
by the mmc controller(s).

Without this fix in place, the 'make dtbs_check' reports
issues with 'max-frequency' value for ipq8074 sdhci node:

  arch/arm64/boot/dts/qcom/ipq8074-hk01.dtb: mmc@...4900:
   max-frequency:0:0: 384000000 is greater than the maximum of 200000000

[1]. https://www.spinics.net/lists/kernel/msg4442049.html

Cc: Ulf Hansson <ulf.hansson@...aro.org>
Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
Cc: Rob Herring <robh@...nel.org>
Signed-off-by: Bhupesh Sharma <bhupesh.sharma@...aro.org>
---
 - v1 can be viewed here: https://lore.kernel.org/linux-arm-msm/20220725180916.2850228-1-bhupesh.sharma@linaro.org/
 - Rebased on linux-next/master

 .../devicetree/bindings/mmc/mmc-controller.yaml     | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/mmc/mmc-controller.yaml b/Documentation/devicetree/bindings/mmc/mmc-controller.yaml
index ff5ce89e5111..802e3ca8be4d 100644
--- a/Documentation/devicetree/bindings/mmc/mmc-controller.yaml
+++ b/Documentation/devicetree/bindings/mmc/mmc-controller.yaml
@@ -88,11 +88,18 @@ properties:
     default: 1
 
   max-frequency:
-    description:
-      Maximum operating frequency of the bus.
+    description: |
+      Maximum operating frequency of the bus:
+        - for eMMC, the maximum supported frequency is 200MHz,
+        - for SD/SDIO cards the SDR104 mode has a max supported
+          frequency of 208MHz,
+        - some mmc host controllers do support a max frequency upto
+          384MHz.
+      So, lets keep the maximum supported value here.
+
     $ref: /schemas/types.yaml#/definitions/uint32
     minimum: 400000
-    maximum: 200000000
+    maximum: 384000000
 
   disable-wp:
     $ref: /schemas/types.yaml#/definitions/flag
-- 
2.35.3