From: Bhupesh Sharma <bhupesh.sharma@linaro.org>
To: linux-mmc@vger.kernel.org, devicetree@vger.kernel.org
Cc: linux-arm-msm@vger.kernel.org, ulf.hansson@linaro.org,
robh@kernel.org, bhupesh.sharma@linaro.org,
bhupesh.linux@gmail.com, linux-kernel@vger.kernel.org,
bjorn.andersson@linaro.org, agross@kernel.org
Subject: [PATCH v2] dt-bindings: mmc: Set maximum documented operating frequency as 384MHz
Date: Tue, 26 Jul 2022 14:15:20 +0530 [thread overview]
Message-ID: <20220726084520.2895454-1-bhupesh.sharma@linaro.org> (raw)
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(-)
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
next reply other threads:[~2022-07-26 8:45 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-26 8:45 Bhupesh Sharma [this message]
2022-07-27 15:04 ` [PATCH v2] dt-bindings: mmc: Set maximum documented operating frequency as 384MHz Rob Herring
2022-08-15 18:27 ` Ulf Hansson
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