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>
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