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ARM: dts: msm: Add SD card LS external feedback clock support

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Add the Level Shifter's external feedback clock entry to support
the SD card HS50 mode running at 50MHz.
By default, the Sun platforms use the Level Shifter devices with
external feedback clock signal connects back to the MSM in order
for the HS50 mode to work at 50MHz. Without the external feedback
clock, the HS50 mode works at reduced frequency at 37.5MHz.

Change-Id: I56c61411d7f792a389fa85661fce7fa5074e2c9f
Signed-off-by: Bao D. Nguyen <quic_nguyenb@quicinc.com>
This commit is contained in:
Bao D. Nguyen
2025-04-10 13:05:42 -07:00
parent 9beba3aef1
commit 7c24cb15cb
3 changed files with 24 additions and 3 deletions
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9
qcom/sun-mtp.dtsi
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@@ -1,6 +1,6 @@
// SPDX-License-Identifier: BSD-3-Clause
/*
* Copyright (c) 2023-2024 Qualcomm Innovation Center, Inc. All rights reserved.
* Copyright (c) 2023-2025 Qualcomm Innovation Center, Inc. All rights reserved.
*/
#include <dt-bindings/gpio/gpio.h>
@@ -282,7 +282,14 @@
resets = <&gcc GCC_SDCC2_BCR>;
reset-names = "core_reset";
/*
* By default, the Sun reference platforms use Level Shifter
* devices with its Feedback Clock signal connects to the MSM.
* Without the external feedback clock, the HS50 mode works at
* reduced frequency at 37.5MHz.
*/
qcom,uses_level_shifter;
qcom,external-fb-clk;
};
&pmih010x_eusb2_repeater {