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| author |  Bhupesh Sharma <bhupesh.sharma@linaro.org>
| 2022-07-26 14:15:20 +0530 |
|---|---|---|
| committer |  Ulf Hansson <ulf.hansson@linaro.org>
| 2022-09-14 11:53:47 +0200 |
| commit | 524836095d91da8e89e3204dd7419a341fea79f9 (patch) | |
| tree | d8f9a193bb77736f24eb69a7ed51b3669cc8b183 /Documentation/devicetree/bindings/mmc | |
| parent | Linux 6.0-rc5 (diff) | |
| download | linux-524836095d91da8e89e3204dd7419a341fea79f9.tar.gz linux-524836095d91da8e89e3204dd7419a341fea79f9.tar.bz2 linux-524836095d91da8e89e3204dd7419a341fea79f9.zip | |
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@7824900:
max-frequency:0:0: 384000000 is greater than the maximum of 200000000
[1]. https://www.spinics.net/lists/kernel/msg4442049.html
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Bhupesh Sharma <bhupesh.sharma@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220726084520.2895454-1-bhupesh.sharma@linaro.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'Documentation/devicetree/bindings/mmc')
| -rw-r--r-- | Documentation/devicetree/bindings/mmc/mmc-controller.yaml | 13 |
1 files 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 |