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u-boot-brain/arch/arm/dts/exynos5422-odroidxu3.dts
Krzysztof Kozlowski ae781d56fe arm: dts: exynos: Add ramp delay property to LDO regulators to Odroid XU3 family 
Add startup time to LDO regulators of S2MPS11 PMIC on Odroid XU3/XU4/HC1
family of boards to be sure the voltage is proper before relying on the
regulator.

The datasheet for all the S2MPS1x family is inconsistent here and does
not specify unambiguously the value of ramp delay for LDO.  It mentions
30 mV/us in one timing diagram but then omits it completely in LDO
regulator characteristics table (it is specified for bucks).

However the vendor kernels for Galaxy S5 and Odroid XU3 use values of 12
mV/us or 24 mV/us.

Without the ramp delay value the consumers do not wait for voltage
settle after changing it.  Although the proper value of ramp delay for
LDOs is unknown, it seems safer to use at least some value from
reference kernel than to leave it unset.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Lukasz Majewski <lukma@denx.de>
Tested-by: Anand Moon <linux.amoon@gmail.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
2019-03-11 15:53:19 +09:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* Odroid XU3 device tree source
*
* Copyright (c) 2014 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*/
/dts-v1/;
#include "exynos54xx.dtsi"
/ {
model = "Odroid XU3 based on EXYNOS5422";
compatible = "samsung,odroidxu3", "samsung,exynos5";
aliases {
serial0 = "/serial@12C00000";
console = "/serial@12C20000";
};
memory {
device_type = "memory";
reg = <0x40000000 0x10000000
0x50000000 0x10000000
0x60000000 0x10000000
0x70000000 0x10000000
0x80000000 0x10000000
0x90000000 0x10000000
0xa0000000 0x10000000
0xb0000000 0xea00000>;
};
adc@12D10000 {
u-boot,dm-pre-reloc;
vdd-supply = <&ldo4_reg>;
status = "okay";
};
i2c@12CA0000 {
s2mps11_pmic@66 {
compatible = "samsung,s2mps11-pmic";
reg = <0x66>;
voltage-regulators {
ldo1_reg: LDO1 {
regulator-name = "vdd_ldo1";
regulator-min-microvolt = <1000000>;
regulator-max-microvolt = <1000000>;
regulator-ramp-delay = <12000>;
regulator-always-on;
};
ldo3_reg: LDO3 {
regulator-name = "vddq_mmc0";
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <1800000>;
regulator-ramp-delay = <12000>;
};
ldo4_reg: LDO4 {
regulator-name = "vdd_adc";
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <1800000>;
regulator-ramp-delay = <12000>;
};
ldo5_reg: LDO5 {
regulator-name = "vdd_ldo5";
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <1800000>;
regulator-ramp-delay = <12000>;
regulator-always-on;
};
ldo6_reg: LDO6 {
regulator-name = "vdd_ldo6";
regulator-min-microvolt = <1000000>;
regulator-max-microvolt = <1000000>;
regulator-ramp-delay = <12000>;
regulator-always-on;
};
ldo7_reg: LDO7 {
regulator-name = "vdd_ldo7";
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <1800000>;
regulator-ramp-delay = <12000>;
regulator-always-on;
};
ldo8_reg: LDO8 {
regulator-name = "vdd_ldo8";
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <1800000>;
regulator-ramp-delay = <12000>;
regulator-always-on;
};
ldo9_reg: LDO9 {
regulator-name = "vdd_ldo9";
regulator-min-microvolt = <3000000>;
regulator-max-microvolt = <3000000>;
regulator-ramp-delay = <12000>;
regulator-always-on;
};
ldo10_reg: LDO10 {
regulator-name = "vdd_ldo10";
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <1800000>;
regulator-ramp-delay = <12000>;
regulator-always-on;
};
ldo11_reg: LDO11 {
regulator-name = "vdd_ldo11";
regulator-min-microvolt = <1000000>;
regulator-max-microvolt = <1000000>;
regulator-ramp-delay = <12000>;
regulator-always-on;
};
ldo12_reg: LDO12 {
regulator-name = "vdd_ldo12";
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <1800000>;
regulator-ramp-delay = <12000>;
regulator-always-on;
};
ldo13_reg: LDO13 {
regulator-name = "vddq_mmc2";
regulator-min-microvolt = <2800000>;
regulator-max-microvolt = <2800000>;
regulator-ramp-delay = <12000>;
};
ldo15_reg: LDO15 {
regulator-name = "vdd_ldo15";
regulator-min-microvolt = <3300000>;
regulator-max-microvolt = <3300000>;
regulator-ramp-delay = <12000>;
regulator-always-on;
};
ldo16_reg: LDO16 {
regulator-name = "vdd_ldo16";
regulator-min-microvolt = <2200000>;
regulator-max-microvolt = <2200000>;
regulator-ramp-delay = <12000>;
regulator-always-on;
};
ldo17_reg: LDO17 {
regulator-name = "vdd_ldo17";
regulator-min-microvolt = <3300000>;
regulator-max-microvolt = <3300000>;
regulator-ramp-delay = <12000>;
regulator-always-on;
};
ldo18_reg: LDO18 {
regulator-name = "vdd_emmc_1V8";
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <1800000>;
regulator-ramp-delay = <12000>;
};
ldo19_reg: LDO19 {
regulator-name = "vdd_sd";
regulator-min-microvolt = <2800000>;
regulator-max-microvolt = <2800000>;
regulator-ramp-delay = <12000>;
};
ldo24_reg: LDO24 {
regulator-name = "tsp_io";
regulator-min-microvolt = <2800000>;
regulator-max-microvolt = <2800000>;
regulator-ramp-delay = <12000>;
regulator-always-on;
};
ldo26_reg: LDO26 {
regulator-name = "vdd_ldo26";
regulator-min-microvolt = <3000000>;
regulator-max-microvolt = <3000000>;
regulator-ramp-delay = <12000>;
regulator-always-on;
};
buck1_reg: BUCK1 {
regulator-name = "vdd_mif";
regulator-min-microvolt = <800000>;
regulator-max-microvolt = <1300000>;
regulator-always-on;
regulator-boot-on;
};
buck2_reg: BUCK2 {
regulator-name = "vdd_arm";
regulator-min-microvolt = <800000>;
regulator-max-microvolt = <1500000>;
regulator-always-on;
regulator-boot-on;
};
buck3_reg: BUCK3 {
regulator-name = "vdd_int";
regulator-min-microvolt = <800000>;
regulator-max-microvolt = <1400000>;
regulator-always-on;
regulator-boot-on;
};
buck4_reg: BUCK4 {
regulator-name = "vdd_g3d";
regulator-min-microvolt = <800000>;
regulator-max-microvolt = <1400000>;
regulator-always-on;
regulator-boot-on;
};
buck5_reg: BUCK5 {
regulator-name = "vdd_mem";
regulator-min-microvolt = <800000>;
regulator-max-microvolt = <1400000>;
regulator-always-on;
regulator-boot-on;
};
buck6_reg: BUCK6 {
regulator-name = "vdd_kfc";
regulator-min-microvolt = <800000>;
regulator-max-microvolt = <1500000>;
regulator-always-on;
regulator-boot-on;
};
buck7_reg: BUCK7 {
regulator-name = "vdd_1.0v_ldo";
regulator-min-microvolt = <800000>;
regulator-max-microvolt = <1500000>;
regulator-always-on;
regulator-boot-on;
};
buck8_reg: BUCK8 {
regulator-name = "vdd_1.8v_ldo";
regulator-min-microvolt = <800000>;
regulator-max-microvolt = <1500000>;
regulator-always-on;
regulator-boot-on;
};
buck9_reg: BUCK9 {
regulator-name = "vdd_2.8v_ldo";
regulator-min-microvolt = <3000000>;
regulator-max-microvolt = <3750000>;
regulator-always-on;
regulator-boot-on;
};
buck10_reg: BUCK10 {
regulator-name = "vdd_vmem";
regulator-min-microvolt = <2850000>;
regulator-max-microvolt = <2850000>;
regulator-always-on;
regulator-boot-on;
};
};
};
};
ehci@12110000 {
samsung,vbus-gpio = <&gpx2 6 GPIO_ACTIVE_HIGH>;
};
serial@12C20000 {
status="okay";
};
mmc@12200000 {
fifoth_val = <0x201f0020>;
};
mmc@12220000 {
fifoth_val = <0x201f0020>;
};
emmc-reset {
compatible = "samsung,emmc-reset";
reset-gpio = <&gpd1 0 0>;
};
};
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