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Wed, 14 Jan 2026 00:57:23 -0800 (PST) From: Jerome Brunet Date: Wed, 14 Jan 2026 09:56:53 +0100 Subject: [PATCH v2 1/2] arm64: dts: amlogic: s4: assign mmc b clock to 24MHz Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260114-amlogic-s4-mmc-fixup-v2-1-7e9ab5f12286@baylibre.com> References: <20260114-amlogic-s4-mmc-fixup-v2-0-7e9ab5f12286@baylibre.com> In-Reply-To: <20260114-amlogic-s4-mmc-fixup-v2-0-7e9ab5f12286@baylibre.com> To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Neil Armstrong , Kevin Hilman , Martin Blumenstingl , Xianwei Zhao , Nick Xie Cc: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org, Jerome Brunet X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=1493; i=jbrunet@baylibre.com; h=from:subject:message-id; bh=iD8WQNBzDHgOnkPSBABm76G4IHl7jfO/G08/hDGOQ48=; b=owEBbQKS/ZANAwAKAeb8Dxw38tqFAcsmYgBpZ1pqfpx3+J/u6VAXTqIHhXnYBGILsIGj6hHZ2 GgF6YplWniJAjMEAAEKAB0WIQT04VmuGPP1bV8btxvm/A8cN/LahQUCaWdaagAKCRDm/A8cN/La hW0+EACTZGM3OUj+3pT7mr8XHNiVzYYixPyBVwfOOjbaWxQEZ4ifZZe07/d2KGb4RAmGIJS5Hkg x0uDV4cHVpSrbCIYmzdwFYljZvuJ8wCjmn69opZO+/q71bmw6KwJkjvIXqnS5LyR7tz8AT/Kve6 NdGRve3pqgPUeYq/g05Y2CqZuFvYILYn4oRrTVsA+B3WgrMzPZqPNvGDHOOigqxNzOP7lbQlDrf nfxIyNLGnyzAGo+D9N5FFJgK+x88bYvGQfpWyb4ZG6H1ROhXSRkiZp1Zhm1kYBCBzrPcyEKcvW2 pceBzORj5S2db4ELPgC8AVtoDN3TmmFeTtrgdqHiSG/Wx2AJZJVxhZ7+qj41lF/+MEyBSpP7R2c I6DGZbxyln58Z9RS9Iuj5X+E6Tp3nAmqmHE8vP3ePvmmy9+sleiJR1LmbSuDreA96uKR5iHpWc8 xHrmDNCfyw8XQZe3yCDlzi5AHHrYr/mJGzkD1fcwLJxLCv1dm4bLNyu5xcTzVn0W3ZvuOkVr9LY FzMc3JfgM20WQcAIMzRz6vBRBdiOl+cbPK4i0hWonzhQ4//Kc6Ilzg1giecRFx8ZHWzmdpDnwgK NrlGydXIK/e8GG47fl3OAUlApjMIBejXDm3npc5P9K3MQeergyqqGiwygfJTflppJ87jOQRs4TS +XgthRsHN1vVSgw== X-Developer-Key: i=jbrunet@baylibre.com; a=openpgp; fpr=F29F26CF27BAE1A9719AE6BDC3C92AAF3E60AED9 The amlogic MMC driver operate with the assumption that MMC clock is configured to provide 24MHz. It uses this path for low rates such as 400kHz. This assumption did hold true until but it now, but it is apparently not the case with s4. The clock has been reported to provide 1GHz instead. This is most likely due to how the bootloader is using the MMC clock on this platform. Regardless of why the MMC clock rate is 1GHz, if the MMC driver expects 24MHz, the clock should be properly assigned, so assign it. Reported-by: Nick Xie Closes: https://lore.kernel.org/linux-amlogic/20260113011931.40424-1-nick@k= hadas.com/ Fixes: 3ab9d54b5d84 ("arm64: dts: amlogic: enable some device nodes for S4") Tested-by: Nick Xie Signed-off-by: Jerome Brunet --- arch/arm64/boot/dts/amlogic/meson-s4.dtsi | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/arm64/boot/dts/amlogic/meson-s4.dtsi b/arch/arm64/boot/dt= s/amlogic/meson-s4.dtsi index 9d99ed2994df..62538fd9db6b 100644 --- a/arch/arm64/boot/dts/amlogic/meson-s4.dtsi +++ b/arch/arm64/boot/dts/amlogic/meson-s4.dtsi @@ -838,6 +838,10 @@ sd: mmc@fe08a000 { clock-names =3D "core", "clkin0", "clkin1"; resets =3D <&reset RESET_SD_EMMC_B>; status =3D "disabled"; + + assigned-clocks =3D <&clkc_periphs CLKID_SD_EMMC_B>; + assigned-clock-parents =3D <0>; + assigned-clock-rates =3D <24000000>; }; =20 emmc: mmc@fe08c000 { --=20 2.47.3 From nobody Mon Feb 9 14:00:40 2026 Received: from mail-wr1-f66.google.com (mail-wr1-f66.google.com [209.85.221.66]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6B64537FF5C for ; 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Wed, 14 Jan 2026 00:57:25 -0800 (PST) Received: from localhost ([2a01:e0a:3c5:5fb1:db84:c9f1:21bc:dca1]) by smtp.gmail.com with UTF8SMTPSA id ffacd0b85a97d-432bd0dacc5sm48674680f8f.5.2026.01.14.00.57.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 14 Jan 2026 00:57:25 -0800 (PST) From: Jerome Brunet Date: Wed, 14 Jan 2026 09:56:54 +0100 Subject: [PATCH v2 2/2] arm64: dts: amlogic: s4: fix mmc clock assignment Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260114-amlogic-s4-mmc-fixup-v2-2-7e9ab5f12286@baylibre.com> References: <20260114-amlogic-s4-mmc-fixup-v2-0-7e9ab5f12286@baylibre.com> In-Reply-To: <20260114-amlogic-s4-mmc-fixup-v2-0-7e9ab5f12286@baylibre.com> To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Neil Armstrong , Kevin Hilman , Martin Blumenstingl , Xianwei Zhao , Nick Xie Cc: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org, Jerome Brunet X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; 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a=openpgp; fpr=F29F26CF27BAE1A9719AE6BDC3C92AAF3E60AED9 MMC A and C are mis-represented as having their "clkin0" input connected to xtal while it is actually connected to the MMC clock, probably in an attempt to provide 24MHz to the device on this input. Fix this and assign the clock to 24MHz to actually provide the required rate. Fixes: 3ab9d54b5d84 ("arm64: dts: amlogic: enable some device nodes for S4") Tested-by: Nick Xie Signed-off-by: Jerome Brunet --- arch/arm64/boot/dts/amlogic/meson-s4.dtsi | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/arch/arm64/boot/dts/amlogic/meson-s4.dtsi b/arch/arm64/boot/dt= s/amlogic/meson-s4.dtsi index 62538fd9db6b..6324d1eb5994 100644 --- a/arch/arm64/boot/dts/amlogic/meson-s4.dtsi +++ b/arch/arm64/boot/dts/amlogic/meson-s4.dtsi @@ -819,13 +819,17 @@ sdio: mmc@fe088000 { reg =3D <0x0 0xfe088000 0x0 0x800>; interrupts =3D ; clocks =3D <&clkc_periphs CLKID_SDEMMC_A>, - <&xtal>, + <&clkc_periphs CLKID_SD_EMMC_A>, <&clkc_pll CLKID_FCLK_DIV2>; clock-names =3D "core", "clkin0", "clkin1"; resets =3D <&reset RESET_SD_EMMC_A>; cap-sdio-irq; keep-power-in-suspend; status =3D "disabled"; + + assigned-clocks =3D <&clkc_periphs CLKID_SD_EMMC_A>; + assigned-clock-parents =3D <0>; + assigned-clock-rates =3D <24000000>; }; =20 sd: mmc@fe08a000 { @@ -849,13 +853,17 @@ emmc: mmc@fe08c000 { reg =3D <0x0 0xfe08c000 0x0 0x800>; interrupts =3D ; clocks =3D <&clkc_periphs CLKID_NAND>, - <&xtal>, + <&clkc_periphs CLKID_SD_EMMC_C>, <&clkc_pll CLKID_FCLK_DIV2>; clock-names =3D "core", "clkin0", "clkin1"; resets =3D <&reset RESET_NAND_EMMC>; no-sdio; no-sd; status =3D "disabled"; + + assigned-clocks =3D <&clkc_periphs CLKID_SD_EMMC_C>; + assigned-clock-parents =3D <0>; + assigned-clock-rates =3D <24000000>; }; }; }; --=20 2.47.3