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Tue, 8 Sep 2026 13:59:47 -0500 From: Jared McArthur To: Siddharth Vadapalli , Udit Kumar , Conor Dooley , Krzysztof Kozlowski , Rob Herring , Tero Kristo , "Vignesh Raghavendra" , Nishanth Menon CC: , , , , "Jared McArthur" Subject: [PATCH v2 1/1] arm64: dts: ti: k3-j784s4-j742s2-evm-common: Set ACSPCIe refclk to MAIN_PLL2_HSDIV4 for pcie1 Date: Tue, 8 Sep 2026 13:59:03 -0500 Message-ID: <20260908185903.404451-1-j-mcarthur@ti.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MN1PEPF0000F0E4:EE_|DS4PPF0FF25AAD9:EE_ X-MS-Office365-Filtering-Correlation-Id: af8967bd-1155-448c-a727-08df0ddb744c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|23010399003|376014|36860700016|1800799024|82310400026|10067099003|6133799003|3023799007|18002099003|56012099006; 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The ACSPCIe reference clock is muxable between multiple sources: SERDESx_REF_DER_OUT_CLK, MAIN_PLL2_HSDIV4_CLKOUT, and SERDESx_REF_OUT_CLK [0]. On reset, the refclk is set to the SERDESx_REF_DER_OUT_CLK. In the J742S2 and J784S4, "the SerDes PCIe Reference Clock Output will be temporarily disabled when changing Data Rates to or from 8.0 GT/s in Derived Refclk mode" [1]. Some external PCIe devices cannot tolerate the reference clock being disabled and will therefore fail to link. This advisory is described in more detail as: i2242 of the J784S4 Silicon Revision 1.0 (Rev. B) document [1]. The refclk for devices connected to PCIe1 is provided by the ACSPCIe buffers in the J742S2XH01EVM [2] and J784S4XEVM [3]. Work around the advisory by setting the ACSPCIe reference clock source to MAIN_PLL2_HSDIV4_CLKOUT. Use the TI SCI clock controller to assign the clock's source [4]. [0] https://www.ti.com/lit/zip/spruj52 [1] https://www.ti.com/lit/pdf/SPRZ536 [2] https://www.ti.com/lit/zip/SPAC001 [3] https://www.ti.com/lit/zip/SPRR458 [4] https://software-dl.ti.com/tisci/esd/latest/5_soc_doc/j784s4/clocks.html Fixes: e3dfcf482d07 ("arm64: dts: ti: k3-j784s4-j742s2-evm-common: Enable ACSPCIE0 output for PCIe1") Reviewed-by: Siddharth Vadapalli Signed-off-by: Jared McArthur --- v2 changes: - Added "Fixes" tag and edited the message to explain the fix - Changed SPRZ536 link to immutable link - Added Siddarth's reviewed-by v1 link: https://lore.kernel.org/all/20260828195140.3476062-1-j-mcarthur@ti.com/ arch/arm64/boot/dts/ti/k3-j784s4-j742s2-evm-common.dtsi | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm64/boot/dts/ti/k3-j784s4-j742s2-evm-common.dtsi b/arch/arm64/boot/dts/ti/k3-j784s4-j742s2-evm-common.dtsi index ff3a85cbc524a..7c085663c8880 100644 --- a/arch/arm64/boot/dts/ti/k3-j784s4-j742s2-evm-common.dtsi +++ b/arch/arm64/boot/dts/ti/k3-j784s4-j742s2-evm-common.dtsi @@ -1206,6 +1206,8 @@ &pcie1_rc { status = "okay"; clocks = <&k3_clks 333 0>, <&serdes0 CDNS_TORRENT_REFCLK_DRIVER>; clock-names = "fck", "pcie_refclk"; + assigned-clocks = <&k3_clks 415 0>; + assigned-clock-parents = <&k3_clks 415 2>; num-lanes = <2>; reset-gpios = <&exp1 2 GPIO_ACTIVE_HIGH>; phys = <&serdes0_pcie1_link>; -- 2.34.1