linux-kernel - [PATCH] arm64: tegra: Add support to enumerate SD in UHS mode

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Date:   Tue, 16 Nov 2021 17:32:36 +0530
From:   Prathamesh Shete <pshete@...dia.com>
To:     <robh+dt@...nel.org>, <thierry.reding@...il.com>,
        <jonathanh@...dia.com>, <devicetree@...r.kernel.org>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <pshete@...dia.com>, <anrao@...dia.com>, <smangipudi@...dia.com>
Subject: [PATCH] arm64: tegra: Add support to enumerate SD in UHS mode

Add support to enumerate SD in UHS mode on Tegra194.

Add required device-tree properties in SDMMC1 and SDMMC3
instances to enable dynamic pad voltage switching
and enumerate SD card in UHS-I modes.

Signed-off-by: Prathamesh Shete <pshete@...dia.com>
---
 arch/arm64/boot/dts/nvidia/tegra194.dtsi | 34 ++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/arch/arm64/boot/dts/nvidia/tegra194.dtsi b/arch/arm64/boot/dts/nvidia/tegra194.dtsi
index b7d532841390..cc89f42bef38 100644
--- a/arch/arm64/boot/dts/nvidia/tegra194.dtsi
+++ b/arch/arm64/boot/dts/nvidia/tegra194.dtsi
@@ -3,6 +3,7 @@
 #include <dt-bindings/gpio/tegra194-gpio.h>
 #include <dt-bindings/interrupt-controller/arm-gic.h>
 #include <dt-bindings/mailbox/tegra186-hsp.h>
+#include <dt-bindings/pinctrl/pinctrl-tegra-io-pad.h>
 #include <dt-bindings/pinctrl/pinctrl-tegra.h>
 #include <dt-bindings/power/tegra194-powergate.h>
 #include <dt-bindings/reset/tegra194-reset.h>
@@ -735,6 +736,9 @@
 					<&mc TEGRA194_MEMORY_CLIENT_SDMMCWA &emc>;
 			interconnect-names = "dma-mem", "write";
 			iommus = <&smmu TEGRA194_SID_SDMMC1>;
+			pinctrl-names = "sdmmc-3v3", "sdmmc-1v8";
+			pinctrl-0 = <&sdmmc1_3v3>;
+			pinctrl-1 = <&sdmmc1_1v8>;
 			nvidia,pad-autocal-pull-up-offset-3v3-timeout =
 									<0x07>;
 			nvidia,pad-autocal-pull-down-offset-3v3-timeout =
@@ -746,6 +750,10 @@
 			nvidia,pad-autocal-pull-down-offset-sdr104 = <0x00>;
 			nvidia,default-tap = <0x9>;
 			nvidia,default-trim = <0x5>;
+			sd-uhs-sdr25;
+			sd-uhs-sdr50;
+			sd-uhs-ddr50;
+			sd-uhs-sdr104;
 			status = "disabled";
 		};
 
@@ -762,6 +770,9 @@
 					<&mc TEGRA194_MEMORY_CLIENT_SDMMCW &emc>;
 			interconnect-names = "dma-mem", "write";
 			iommus = <&smmu TEGRA194_SID_SDMMC3>;
+			pinctrl-names = "sdmmc-3v3", "sdmmc-1v8";
+			pinctrl-0 = <&sdmmc3_3v3>;
+			pinctrl-1 = <&sdmmc3_1v8>;
 			nvidia,pad-autocal-pull-up-offset-1v8 = <0x00>;
 			nvidia,pad-autocal-pull-down-offset-1v8 = <0x7a>;
 			nvidia,pad-autocal-pull-up-offset-3v3-timeout = <0x07>;
@@ -774,6 +785,10 @@
 			nvidia,pad-autocal-pull-down-offset-sdr104 = <0x00>;
 			nvidia,default-tap = <0x9>;
 			nvidia,default-trim = <0x5>;
+			sd-uhs-sdr25;
+			sd-uhs-sdr50;
+			sd-uhs-ddr50;
+			sd-uhs-sdr104;
 			status = "disabled";
 		};
 
@@ -1303,6 +1318,25 @@
 
 			#interrupt-cells = <2>;
 			interrupt-controller;
+			sdmmc1_3v3: sdmmc1-3v3 {
+				pins = "sdmmc1-hv";
+				power-source = <TEGRA_IO_PAD_VOLTAGE_3V3>;
+			};
+
+			sdmmc1_1v8: sdmmc1-1v8 {
+				pins = "sdmmc1-hv";
+				power-source = <TEGRA_IO_PAD_VOLTAGE_1V8>;
+			};
+			sdmmc3_3v3: sdmmc3-3v3 {
+				pins = "sdmmc3-hv";
+				power-source = <TEGRA_IO_PAD_VOLTAGE_3V3>;
+			};
+
+			sdmmc3_1v8: sdmmc3-1v8 {
+				pins = "sdmmc3-hv";
+				power-source = <TEGRA_IO_PAD_VOLTAGE_1V8>;
+			};
+
 		};
 
 		smmu: iommu@...00000 {
-- 
2.17.1