linux-kernel - [PATCH v3] arm64: dts: ti: k3-j721s2-main: Enable support for SDR104 speed mode

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Date:   Wed, 20 Sep 2023 15:11:30 +0530
From:   Bhavya Kapoor <b-kapoor@...com>
To:     <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
CC:     <nm@...com>, <vigneshr@...com>, <kristo@...nel.org>,
        <robh+dt@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <conor+dt@...nel.org>, <linux-arm-kernel@...ts.infradead.org>,
        <a-govindraju@...com>, <kishon@...com>, <b-kapoor@...com>,
        <u-kumar1@...com>
Subject: [PATCH v3] arm64: dts: ti: k3-j721s2-main: Enable support for SDR104 speed mode

According to TRM for J721S2, SDR104 speed mode is supported by the SoC
but its capabilities were masked in device tree. Remove sdhci-caps-mask
to enable support for SDR104 speed mode for SD card in J721S2 SoC. Also
add itap delay select value for DDR50 High Speed Mode.

[+] Refer to : section 12.3.6.1.1 MMCSD Features, in J721S2 TRM
- https://www.ti.com/lit/zip/spruj28

Fixes: b8545f9d3a54 ("arm64: dts: ti: Add initial support for J721S2 SoC")
Signed-off-by: Bhavya Kapoor <b-kapoor@...com>
Reviewed-by: Udit Kumar <u-kumar1@...com>
---

Changelog v2->v3:
 - Add Itap Delay Select value for DDR50 SD High Speed Mode

Link to v2 patch : https://lore.kernel.org/all/20230412121415.860447-1-b-kapoor@ti.com/

 arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi b/arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi
index 084f8f5b6699..a5ab301b14f1 100644
--- a/arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi
@@ -766,11 +766,10 @@ main_sdhci1: mmc@...0000 {
 		ti,itap-del-sel-sd-hs = <0x0>;
 		ti,itap-del-sel-sdr12 = <0x0>;
 		ti,itap-del-sel-sdr25 = <0x0>;
+		ti,itap-del-sel-ddr50 = <0x2>;
 		ti,clkbuf-sel = <0x7>;
 		ti,trm-icp = <0x8>;
 		dma-coherent;
-		/* Masking support for SDR104 capability */
-		sdhci-caps-mask = <0x00000003 0x00000000>;
 		status = "disabled";
 	};
 
-- 
2.39.2