40 lines
1.4 KiB
Diff
40 lines
1.4 KiB
Diff
From 8127a1d15b63b1f582be9c212472b8d50bcb3b9d Mon Sep 17 00:00:00 2001
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From: Sarthak Garg <quic_sartgarg@quicinc.com>
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Date: Thu, 7 Nov 2024 13:35:03 +0530
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Subject: [PATCH 06/18] dt-bindings: mmc: qcom: Document level shifter flag for
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SD card
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Introduce a flag to indicate if the Qualcomm platform has a level
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shifter for SD cards. With level shifter addition some extra delay is
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seen on RX data path leading to CRC errors. To compensate these delays
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and avoid CRC errors below things needs to be done:
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1) Enable tuning for SDR50 mode
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2) Limit HS mode frequency to 37.5MHz from 50MHz
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Add this flag for all targets with a level shifter to handle these
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issues for SD card.
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Signed-off-by: Sarthak Garg <quic_sartgarg@quicinc.com>
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---
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Documentation/devicetree/bindings/mmc/sdhci-msm.yaml | 3 +++
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1 file changed, 3 insertions(+)
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diff --git a/Documentation/devicetree/bindings/mmc/sdhci-msm.yaml b/Documentation/devicetree/bindings/mmc/sdhci-msm.yaml
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index 594bd174f..14b91538a 100644
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--- a/Documentation/devicetree/bindings/mmc/sdhci-msm.yaml
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+++ b/Documentation/devicetree/bindings/mmc/sdhci-msm.yaml
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@@ -138,6 +138,9 @@ properties:
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$ref: /schemas/types.yaml#/definitions/uint32
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description: platform specific settings for DLL_CONFIG reg.
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+ qcom,use-level-shifter:
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+ description: Flag to indicate if platform has level shifter for SD card.
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+
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iommus:
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minItems: 1
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maxItems: 8
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--
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2.43.0
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