linux-kernel - [PATCH] ARM: dts: stm32: add system-clock-direction-out on stm32mp15xx-dkx

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Message-ID: <20250521150418.488152-1-olivier.moysan@foss.st.com>
Date: Wed, 21 May 2025 17:04:18 +0200
From: Olivier Moysan <olivier.moysan@...s.st.com>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Maxime Coquelin
	<mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>
CC: Olivier Moysan <olivier.moysan@...s.st.com>, <devicetree@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] ARM: dts: stm32: add system-clock-direction-out on stm32mp15xx-dkx

The commit 5725bce709db
("ASoC: simple-card-utils: Unify clock direction by clk_direction")
corrupts the audio on STM32MP15 DK sound cards.
The parent clock is not correctly set, because set_sai_ck_rate() is not
executed in stm32_sai_set_sysclk() callback.
This occurs because set_sysclk() is called with the wrong direction,
SND_SOC_CLOCK_IN instead of SND_SOC_CLOCK_OUT.

Add system-clock-direction-out property in SAI2A endpoint node of
STM32MP15XX-DKX device tree, to specify the MCLK clock direction.

Signed-off-by: Olivier Moysan <olivier.moysan@...s.st.com>
---
 arch/arm/boot/dts/st/stm32mp15xx-dkx.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/boot/dts/st/stm32mp15xx-dkx.dtsi b/arch/arm/boot/dts/st/stm32mp15xx-dkx.dtsi
index a5511b1f0ce3..c74e36676d1b 100644
--- a/arch/arm/boot/dts/st/stm32mp15xx-dkx.dtsi
+++ b/arch/arm/boot/dts/st/stm32mp15xx-dkx.dtsi
@@ -515,6 +515,7 @@ sai2a_endpoint: endpoint {
 				remote-endpoint = <&cs42l51_tx_endpoint>;
 				dai-format = "i2s";
 				mclk-fs = <256>;
+				system-clock-direction-out;
 				dai-tdm-slot-num = <2>;
 				dai-tdm-slot-width = <32>;
 			};
-- 
2.25.1