| Message ID | 20220726084520.2895454-1-bhupesh.sharma@linaro.org |
|---|---|
| State | Accepted |
| Commit | 524836095d91da8e89e3204dd7419a341fea79f9 |
| Headers | show |
| Series | [v2] dt-bindings: mmc: Set maximum documented operating frequency as 384MHz | expand |
On Tue, 26 Jul 2022 14:15:20 +0530, Bhupesh Sharma wrote: > 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: Ulf Hansson <ulf.hansson@linaro.org> > Cc: Bjorn Andersson <bjorn.andersson@linaro.org> > Cc: Rob Herring <robh@kernel.org> > Signed-off-by: Bhupesh Sharma <bhupesh.sharma@linaro.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(-) > Reviewed-by: Rob Herring <robh@kernel.org>
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
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: Ulf Hansson <ulf.hansson@linaro.org> Cc: Bjorn Andersson <bjorn.andersson@linaro.org> Cc: Rob Herring <robh@kernel.org> Signed-off-by: Bhupesh Sharma <bhupesh.sharma@linaro.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(-)