Commit 79b08ae7 authored by Aswath Govindraju's avatar Aswath Govindraju Committed by Nishanth Menon
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arm64: dts: ti: k3-am65: Add support for UHS-I modes in MMCSD1 subsystem 

UHS-I speed modes are supported in AM65 S.R. 2.0 SoC[1].

Add support by removing the no-1-8-v tag and including the voltage
regulator device tree nodes for power cycling.

However, the 4 bit interface of AM65 SR 1.0 cannot be supported at 3.3 V or
1.8 V because of erratas i2025 and i2026 [2]. As the SD card is the primary
boot mode for development usecases, continue to enable SD card and disable
UHS-I modes in it to minimize any ageing issues happening because of
erratas.

k3-am6528-iot2050-basic and k3-am6548-iot2050-advanced boards use S.R. 1.0
version of AM65 SoC. Therefore, add no-1-8-v in sdhci1 device tree node of
the common iot2050 device tree file.

[1] - https://www.ti.com/lit/ug/spruid7e/spruid7e.pdf, section 12.3.6.1.1
[2] - https://www.ti.com/lit/er/sprz452e/sprz452e.pdf



Signed-off-by: default avatarAswath Govindraju <a-govindraju@ti.com>
Acked-by: default avatarJan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: default avatarNishanth Menon <nm@ti.com>
Link: https://lore.kernel.org/r/20210529033749.6250-1-a-govindraju@ti.com
parent 69db725c

arch/arm64/boot/dts/ti/k3-am65-iot2050-common.dtsi

+1 −0
Original line number Diff line number Diff line
@@ -555,6 +555,7 @@ &sdhci1 { 
	pinctrl-0 = <&main_mmc1_pins_default>;

	ti,driver-strength-ohm = <50>;

	disable-wp;

	no-1-8-v;

};



&usb0 {

arch/arm64/boot/dts/ti/k3-am65-main.dtsi

+0 −1
Original line number Diff line number Diff line
@@ -301,7 +301,6 @@ sdhci1: mmc@4fa0000 { 
		ti,otap-del-sel = <0x2>;

		ti,trm-icp = <0x8>;

		dma-coherent;

		no-1-8-v;

	};



	scm_conf: scm-conf@100000 {

arch/arm64/boot/dts/ti/k3-am654-base-board.dts

+33 −0
Original line number Diff line number Diff line
@@ -85,6 +85,38 @@ sw6 { 
			gpios = <&wkup_gpio0 27 GPIO_ACTIVE_LOW>;

		};

	};



	evm_12v0: fixedregulator-evm12v0 {

		/* main supply */

		compatible = "regulator-fixed";

		regulator-name = "evm_12v0";

		regulator-min-microvolt = <12000000>;

		regulator-max-microvolt = <12000000>;

		regulator-always-on;

		regulator-boot-on;

	};



	vcc3v3_io: fixedregulator-vcc3v3io {

		/* Output of TPS54334 */

		compatible = "regulator-fixed";

		regulator-name = "vcc3v3_io";

		regulator-min-microvolt = <3300000>;

		regulator-max-microvolt = <3300000>;

		regulator-always-on;

		regulator-boot-on;

		vin-supply = <&evm_12v0>;

	};



	vdd_mmc1_sd: fixedregulator-sd {

		compatible = "regulator-fixed";

		regulator-name = "vdd_mmc1_sd";

		regulator-min-microvolt = <3300000>;

		regulator-max-microvolt = <3300000>;

		regulator-boot-on;

		enable-active-high;

		vin-supply = <&vcc3v3_io>;

		gpio = <&pca9554 4 GPIO_ACTIVE_HIGH>;

	};

};



&wkup_pmx0 {
@@ -327,6 +359,7 @@ &sdhci0 { 
 * disable sdhci1

 */

&sdhci1 {

	vmmc-supply = <&vdd_mmc1_sd>;

	pinctrl-names = "default";

	pinctrl-0 = <&main_mmc1_pins_default>;

	ti,driver-strength-ohm = <50>;