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Mon, 12 Jan 2026 17:20:01 -0800 (PST) Received: from localhost.localdomain ([47.82.78.41]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-34f5f7c4141sm18533379a91.6.2026.01.12.17.19.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 12 Jan 2026 17:20:01 -0800 (PST) From: Nick Xie X-Google-Original-From: Nick Xie To: neil.armstrong@linaro.org, khilman@baylibre.com, jbrunet@baylibre.com, martin.blumenstingl@googlemail.com, xianwei.zhao@amlogic.com, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org Cc: krzk+dt@kernel.org, conor+dt@kernel.org, robh@kernel.org, nick@khadas.com Subject: [PATCH] arm64: dts: amlogic: S4: fix SD card initialization failure Date: Tue, 13 Jan 2026 09:19:31 +0800 Message-Id: <20260113011931.40424-1-nick@khadas.com> X-Mailer: git-send-email 2.17.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" The SD controller (sd@fe08a000) requires a clock source capable of generating a 400kHz frequency for the identification phase. Currently, the sd node uses CLKID_SD_EMMC_B as clkin0 and CLKID_FCLK_DIV2 as clkin1. Both of these are high-frequency clocks (e.g., ~1GHz). The internal divider of the SD controller is limited to a maximum value of 64 (2^6). With input frequencies significantly higher than 25.6MHz (400kHz * 64), the driver is unable to generate the required 400kHz clock, causing the probe to fail with -EINVAL. Fix this by reparenting clkin0 to the 24MHz XTAL clock, consistent with the configuration of the sdio and emmc nodes. This allows the divider to successfully generate 400kHz (24MHz / 60). Verified on Khadas VIM1S with SoC S4 S905Y4. Fixes: 3ab9d54b5d847 ("arm64: dts: amlogic: enable some device nodes for S4= ") Signed-off-by: Nick Xie --- arch/arm64/boot/dts/amlogic/meson-s4.dtsi | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/boot/dts/amlogic/meson-s4.dtsi b/arch/arm64/boot/dt= s/amlogic/meson-s4.dtsi index 9d99ed2994dfa..b87bc83b5a9bb 100644 --- a/arch/arm64/boot/dts/amlogic/meson-s4.dtsi +++ b/arch/arm64/boot/dts/amlogic/meson-s4.dtsi @@ -833,7 +833,7 @@ sd: mmc@fe08a000 { reg =3D <0x0 0xfe08a000 0x0 0x800>; interrupts =3D ; clocks =3D <&clkc_periphs CLKID_SDEMMC_B>, - <&clkc_periphs CLKID_SD_EMMC_B>, + <&xtal>, <&clkc_pll CLKID_FCLK_DIV2>; clock-names =3D "core", "clkin0", "clkin1"; resets =3D <&reset RESET_SD_EMMC_B>; --=20 2.34.1