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arm64: dts: ti: k3-am65: Add support for UHS-I modes in MMCSD1 subsystem

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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: Aswath Govindraju <a-govindraju@ti.com>
Acked-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Link: https://lore.kernel.org/r/20210529033749.6250-1-a-govindraju@ti.com
This commit is contained in:
Aswath Govindraju 2021-05-29 09:07:49 +05:30 committed by Nishanth Menon
parent 69db725cdb
commit 79b08ae7c4
3 changed files with 34 additions and 1 deletions
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1
arch/arm64/boot/dts/ti/k3-am65-iot2050-common.dtsi
View file

@ -555,6 +555,7 @@ &sdhci1 {
pinctrl-0 = <&main_mmc1_pins_default>;
ti,driver-strength-ohm = <50>;
disable-wp;
no-1-8-v;
};
&usb0 {

1
arch/arm64/boot/dts/ti/k3-am65-main.dtsi
View file

@ -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 {

33
arch/arm64/boot/dts/ti/k3-am654-base-board.dts
View file

@ -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>;