Re: [PATCH 3/3] ARM: dts: Add support for Samsung Chagallwifi

From: Krzysztof Kozlowski
Date: Sat Jan 15 2022 - 11:34:34 EST

On 13/01/2022 16:40, Henrik Grimler wrote:
> Chagallwifi, with product name Samsung Galaxy Tab S 10.5", is based on
> Exynos 5420. This device is one of several tablet models released in
> 2013 - 2014 based on Exynos 5420.
>
> The device tree added here contains support for:
>
> - UART
> - eMMC
> - SD card
> - USB
>

Thanks for the patches. It is a really nice work, good job!

Some comments below.

> CCI has been disabled in the hardware, enabling it would require
> (de-)soldering a resistor on the board. Trying to boot with it
> enabled in kernel makes the device hang when CCI is probed.
> Exynos5420-arndale-octa also has had CCI disabled due to issues [1].
>
> To successfully boot the mainline kernel with the stock bootloader
> (SBOOT), an additional hack is needed [2]. The same hack is also
> needed to boot exynos4412-i9300 with stock bootloader, and probably
> other Samsung devices of similar age.
>
> [1] https://marc.info/?l=linux-arm-kernel&m=141718639200624

Commits should use 'commit SHA_12char ("subject")' format instead of
links to mailing lists.

> [2] https://lore.kernel.org/all/1355276466-18295-1-git-send-email-arve@xxxxxxxxxxx/
>
> Signed-off-by: Henrik Grimler <henrik@xxxxxxxxxx>
> ---
> arch/arm/boot/dts/Makefile | 1 +
> arch/arm/boot/dts/exynos5420-chagallwifi.dts | 57 ++
> .../dts/exynos5420-galaxy-tab-common.dtsi | 647 ++++++++++++++++++
> 3 files changed, 705 insertions(+)
> create mode 100644 arch/arm/boot/dts/exynos5420-chagallwifi.dts
> create mode 100644 arch/arm/boot/dts/exynos5420-galaxy-tab-common.dtsi
>
> diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
> index 0de64f237cd8..be7a493ff1a1 100644
> --- a/arch/arm/boot/dts/Makefile
> +++ b/arch/arm/boot/dts/Makefile
> @@ -220,6 +220,7 @@ dtb-$(CONFIG_ARCH_EXYNOS5) += \
> exynos5420-arndale-octa.dtb \
> exynos5420-peach-pit.dtb \
> exynos5420-smdk5420.dtb \
> + exynos5420-chagallwifi.dtb \

The name is something like Chagall WiFi, Chagall-WiFi or other
variations, because the device family name is Chagall and WiFi is variant.
Therefore here, patch 1/3, the compatible and all names, please make:
- exynos5420-chagall-wifi.dtb
- "samsung,chagall-wifi"
etc.

> exynos5422-odroidhc1.dtb \
> exynos5422-odroidxu3.dtb \
> exynos5422-odroidxu3-lite.dtb \
> diff --git a/arch/arm/boot/dts/exynos5420-chagallwifi.dts b/arch/arm/boot/dts/exynos5420-chagallwifi.dts
> new file mode 100644
> index 000000000000..51eb2bbe6bf6
> --- /dev/null
> +++ b/arch/arm/boot/dts/exynos5420-chagallwifi.dts
> @@ -0,0 +1,57 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Samsung's Exynos5420 Chagallwifi board device tree source
> + *
> + * Copyright (c) 2012-2013 Samsung Electronics Co., Ltd.
> + * http://www.samsung.com
> + * Copyright (c) 2022 Henrik Grimler
> + */
> +
> +/dts-v1/;
> +#include "exynos5420-galaxy-tab-common.dtsi"

Do you plan to have more Galaxy Tab versions?

> +
> +/ {
> + model = "Samsung Chagallwifi based on exynos5420";

"Chagall WiFi"?

> + compatible = "samsung,chagallwifi", "samsung,exynos5420", \
> + "samsung,exynos5";
> +};
> +
> +&s2mps11 {
> + regulators {
> + ldo15_reg: LDO15 {

Please define these regulator nodes in DTSI (only name needed and
comment like you have there) and override them by label (&ldo15_reg { ...).

> + /* Unused */
> + regulator-name = "VDD_LDO15";
> + regulator-min-microvolt = <3300000>;
> + regulator-max-microvolt = <3300000>;
> + };
> +
> + ldo17_reg: LDO17 {
> + regulator-name = "VDD_IRLED_3V3";
> + regulator-min-microvolt = <3300000>;
> + regulator-max-microvolt = <3350000>;
> + regulator-always-on;
> + regulator-boot-on;
> +
> + regulator-state-mem {
> + regulator-off-in-suspend;
> + };
> + };
> +
> + ldo28_reg: LDO28 {
> + /* Unused */
> + regulator-name = "VDD_LDO28";
> + regulator-min-microvolt = <3300000>;
> + regulator-max-microvolt = <3300000>;
> + };
> +
> + ldo29_reg: LDO29 {
> + regulator-name = "VDD_TCON_1V8";
> + regulator-min-microvolt = <1900000>;
> + regulator-max-microvolt = <1900000>;
> +
> + regulator-state-mem {
> + regulator-off-in-suspend;
> + };
> + };
> + };
> +};
> diff --git a/arch/arm/boot/dts/exynos5420-galaxy-tab-common.dtsi b/arch/arm/boot/dts/exynos5420-galaxy-tab-common.dtsi
> new file mode 100644
> index 000000000000..cbcf1c117b67
> --- /dev/null
> +++ b/arch/arm/boot/dts/exynos5420-galaxy-tab-common.dtsi
> @@ -0,0 +1,647 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Base DT for Samsung's family of tablets based on Exynos5420.
> + *
> + * Copyright (c) 2012-2013 Samsung Electronics Co., Ltd.
> + * http://www.samsung.com
> + * Copyright (c) 2022 Henrik Grimler
> + */
> +
> +/dts-v1/;
> +#include "exynos5420.dtsi"
> +#include "exynos5420-cpus.dtsi"
> +#include <dt-bindings/input/input.h>
> +#include <dt-bindings/gpio/gpio.h>
> +#include <dt-bindings/clock/samsung,s2mps11.h>
> +
> +/ {
> + compatible = "samsung,exynos5420", "samsung,exynos5";

Skip the compatible. It duplicates exynos5420.dtsi and does not bring
any more information here.

> + chassis-type = "tablet";
> +
> + chosen {
> + stdout-path = "serial2:115200n8";
> + };
> +
> + memory@20000000 {
> + device_type = "memory";
> + reg = <0x20000000 0xc0000000>;
> + };
> +
> + firmware@2073000 {
> + compatible = "samsung,secure-firmware";
> + reg = <0x02073000 0x1000>;
> + };
> +
> + fixed-rate-clocks {
> + oscclk {
> + compatible = "samsung,exynos5420-oscclk";
> + clock-frequency = <24000000>;
> + };
> +
> + xxti {
> + compatible = "samsung,clock-xxti";
> + clock-frequency = <24000000>;
> + };
> +
> + xusbxti {
> + compatible = "samsung,clock-xusbxti";
> + clock-frequency = <24000000>;
> + };

Just keep one clock - oscclk. We treat it as alias of xxti, even though
it might not be exactly alias. I am not sure about real differences, but
anyway the driver does not care about xxti and xusbxti. xusbxti appears
in Exynos5420 only partially, e.g. not in all places like ballmap. Other
boards have only oscclk, so let's do the same.

> + };
> +
> + gpio-keys {
> + compatible = "gpio-keys";
> + pinctrl-names = "default";
> +
> + power {

key-power and so on.

> + debounce-interval = <10>;
> + gpios = <&gpx2 2 GPIO_ACTIVE_LOW>;
> + label = "Power";
> + linux,code = <KEY_POWER>;
> + wakeup-source;
> + };
> +
> + home {
> + debounce-interval = <10>;
> + gpios = <&gpx0 5 GPIO_ACTIVE_LOW>;
> + label = "Home";
> + linux,code = <KEY_HOME>;
> + wakeup-source;
> + };
> +
> + volume-up {
> + debounce-interval = <10>;
> + gpios = <&gpx0 2 GPIO_ACTIVE_LOW>;
> + label = "Volume Up";
> + linux,code = <KEY_VOLUMEUP>;
> + };
> +
> + volume-down {
> + debounce-interval = <10>;
> + gpios = <&gpx0 3 GPIO_ACTIVE_LOW>;
> + label = "Volume Down";
> + linux,code = <KEY_VOLUMEDOWN>;
> + };
> + };
> +};
> +
> +&cci {
> + /* CCI is disabled in hardware */
> + status = "disabled";
> +};
> +
> +&cpu0 {
> + cpu-supply = <&buck2_reg>;
> +};
> +
> +&cpu4 {
> + cpu-supply = <&buck6_reg>;
> +};
> +
> +&gpu {
> + status = "okay";
> + mali-supply = <&buck4_reg>;
> +};
> +
> +&hsi2c_7 {
> + status = "okay";
> +
> + s2mps11: pmic@66 {
> + compatible = "samsung,s2mps11-pmic";
> + reg = <0x66>;
> +
> + interrupt-parent = <&gpx3>;
> + interrupts = <2 IRQ_TYPE_LEVEL_LOW>;
> + pinctrl-names = "default";
> + pinctrl-0 = <&s2mps11_irq>;
> +
> + s2mps11_osc: clocks {
> + compatible = "samsung,s2mps11-clk";
> + #clock-cells = <1>;
> + clock-output-names = "s2mps11_ap", "s2mps11_cp",
> + "s2mps11_bt";
> + };
> +
> + buck1_reg: BUCK1 {

All regulators should be under node "regulators". It should not work
properly without it, e.g. check
/sys/kernel/debug/regulator/regulator_summary if values match ones you
define.

> + regulator-name = "VDD_MIF_1V1";
> + regulator-min-microvolt = <700000>;
> + regulator-max-microvolt = <1300000>;
> + regulator-always-on;
> + regulator-boot-on;
> +
> + regulator-state-mem {
> + regulator-off-in-suspend;
> + regulator-suspend-microvolt = <1100000>;

Property is deprecated and I am not sure what is it's purpose since, the
regulator is off in suspend.

> + };
> + };
> +
> + buck2_reg: BUCK2 {
> + regulator-name = "VDD_ARM_1V0";
> + regulator-min-microvolt = <800000>;
> + regulator-max-microvolt = <1500000>;
> + regulator-always-on;
> + regulator-boot-on;
> + regulator-ramp-delay = <12500>;
> +
> + regulator-state-mem {
> + regulator-off-in-suspend;
> + };
> + };
> +
> + buck3_reg: BUCK3 {
> + regulator-name = "VDD_INT_1V0";
> + regulator-min-microvolt = <800000>;
> + regulator-max-microvolt = <1400000>;
> + regulator-always-on;
> + regulator-boot-on;
> +
> + regulator-state-mem {
> + regulator-off-in-suspend;
> + regulator-suspend-microvolt = <1100000>;

Same.

> + };
> + };
> +
> + buck4_reg: BUCK4 {
> + regulator-name = "VDD_G3D_1V0";
> + regulator-min-microvolt = <700000>;
> + regulator-max-microvolt = <1400000>;
> + regulator-always-on;
> + regulator-boot-on;
> + regulator-ramp-delay = <12500>;
> +
> + regulator-state-mem {
> + regulator-off-in-suspend;
> + };
> + };
> +
> + buck5_reg: BUCK5 {
> + regulator-name = "VDD_MEM_1V2";
> + regulator-min-microvolt = <1200000>;
> + regulator-max-microvolt = <1200000>;
> + regulator-always-on;
> + regulator-boot-on;
> + };
> +
> + buck6_reg: BUCK6 {
> + regulator-name = "VDD_KFC_1V0";
> + regulator-min-microvolt = <800000>;
> + regulator-max-microvolt = <1500000>;
> + regulator-always-on;
> + regulator-boot-on;
> +
> + regulator-state-mem {
> + regulator-off-in-suspend;
> + };
> + };
> +
> + buck7_reg: BUCK7 {
> + regulator-name = "VIN_LLDO_1V4";
> + regulator-min-microvolt = <1200000>;
> + regulator-max-microvolt = <1500000>;
> + regulator-always-on;
> + };
> +
> + buck8_reg: BUCK8 {
> + regulator-name = "VIN_MLDO_2V0";
> + regulator-min-microvolt = <1800000>;
> + regulator-max-microvolt = <2100000>;
> + regulator-always-on;
> + };
> +
> + buck9_reg: BUCK9 {
> + regulator-name = "VIN_HLDO_3V5";
> + regulator-min-microvolt = <3000000>;
> + regulator-max-microvolt = <3500000>;
> + regulator-always-on;
> + };
> +
> + buck10_reg: BUCK10 {
> + regulator-name = "VDD_CAM_ISP_1V0";
> + regulator-min-microvolt = <750000>;
> + regulator-max-microvolt = <3550000>;
> + };
> +
> + ldo1_reg: LDO1 {
> + regulator-name = "VDD_ALIVE_1.0V";
> + regulator-min-microvolt = <1000000>;
> + regulator-max-microvolt = <1000000>;
> + regulator-always-on;
> + };
> +
> + ldo2_reg: LDO2 {
> + regulator-name = "VDD_APIO_1V8";
> + regulator-min-microvolt = <1800000>;
> + regulator-max-microvolt = <1800000>;
> + regulator-always-on;
> + regulator-boot-on;
> + };
> +
> + ldo3_reg: LDO3 {
> + regulator-name = "VDD_APIO_MMC2_1V8";
> + regulator-min-microvolt = <1800000>;
> + regulator-max-microvolt = <1800000>;
> + regulator-always-on;
> +
> + regulator-state-mem {
> + regulator-off-in-suspend;
> + };
> + };
> +
> + ldo4_reg: LDO4 {
> + regulator-name = "VDD_ADC_1V8";
> + regulator-min-microvolt = <1800000>;
> + regulator-max-microvolt = <1800000>;
> + regulator-always-on;
> + regulator-boot-on;
> + };
> +
> + ldo5_reg: LDO5 {
> + /* Unused */
> + regulato-name = "VDD_LDO5";
> + regulator-min-microvolt = <1800000>;
> + regulator-max-microvolt = <1800000>;
> + };
> +
> + ldo6_reg: LDO6 {
> + regulator-name = "VDD_MIPI_1V0";
> + regulator-min-microvolt = <1000000>;
> + regulator-max-microvolt = <1000000>;
> + regulator-always-on;
> + regulator-boot-on;
> +
> + regulator-state-mem {
> + regulator-off-in-suspend;
> + };
> + };
> +
> + ldo7_reg: LDO7 {
> + regulator-name = "VDD_MIPI_PLL_ABB1_18V";
> + regulator-min-microvolt = <1800000>;
> + regulator-max-microvolt = <1800000>;
> + regulator-always-on;
> + regulator-boot-on;
> +
> + regulator-state-mem {
> + regulator-off-in-suspend;
> + };
> + };
> +
> + ldo8_reg: LDO8 {
> + /* Unused */
> + regulator-name = "VDD_LDO8";
> + regulator-min-microvolt = <1800000>;
> + regulator-max-microvolt = <1800000>;
> + };
> +
> + ldo9_reg: LDO9 {
> + regulator-name = "VDD_UOTG_3V0";
> + regulator-min-microvolt = <3000000>;
> + regulator-max-microvolt = <3000000>;
> + regulator-always-on;
> + regulator-boot-on;
> + };
> +
> + ldo10_reg: LDO10 {
> + regulator-name = "VDDQ_PRE_1V8";
> + regulator-min-microvolt = <1800000>;
> + regulator-max-microvolt = <1800000>;
> + regulator-always-on;
> + regulator-boot-on;
> + };
> +
> + ldo11_reg: LDO11 {
> + regulator-name = "VDD_HSIC_1V0";
> + regulator-min-microvolt = <1000000>;
> + regulator-max-microvolt = <1000000>;
> + regulator-always-on;
> + regulator-boot-on;
> + };
> +
> + ldo12_reg: LDO12 {
> + regulator-name = "VDD_HSIC_1V8";
> + regulator-min-microvolt = <1800000>;
> + regulator-max-microvolt = <1800000>;
> + regulator-always-on;
> + regulator-boot-on;
> + };
> +
> + ldo13_reg: LDO13 {
> + regulator-name = "VDD_APIO_MMC2_2V8";
> + regulator-min-microvolt = <1800000>;
> + regulator-max-microvolt = <2800000>;
> + regulator-boot-on;
> +
> + regulator-state-mem {
> + regulator-off-in-suspend;
> + };
> + };
> +
> + ldo14_reg: LDO14 {
> + regulator-name = "VDD_MOTOR_3V0";
> + regulator-min-microvolt = <3000000>;
> + regulator-max-microvolt = <3000000>;
> +
> + regulator-state-mem {
> + regulator-off-in-suspend;
> + };
> + };
> +
> + /*
> + * LDO15 varies between devices and is
> + * specified in the device dts
> + */

Do it like ldo25 in arch/arm/boot/dts/exynos4412-midas.dtsi. Comment is
good.

> +
> + ldo16_reg: LDO16 {
> + regulator-name = "VDD_AP_2V8";
> + regulator-min-microvolt = <2800000>;
> + regulator-max-microvolt = <2800000>;
> + regulator-always-on;
> + regulator-boot-on;
> +
> + regulator-state-mem {
> + regulator-on-in-suspend;
> + };
> + };
> +
> + /*
> + * LDO17 varies between devices and is
> + * specified in the device dts
> + */
> +
> + ldo18_reg: LDO18 {
> + /* Unused */
> + regulator-name = "VDD_LDO18";
> + regulator-min-microvolt = <1800000>;
> + regulator-max-microvolt = <1800000>;
> + };
> +
> +
> + ldo19_reg: LDO19 {
> + regulator-name = "VDD_VTF_2V8";
> + regulator-min-microvolt = <2800000>;
> + regulator-max-microvolt = <2800000>;
> +
> + regulator-state-mem {
> + regulator-off-in-suspend;
> + };
> + };
> +
> + ldo20_reg: LDO20 {
> + regulator-name = "VDD_CAM1_CAM_1V8";
> + regulator-min-microvolt = <1800000>;
> + regulator-max-microvolt = <1800000>;
> +
> + regulator-state-mem {
> + regulator-off-in-suspend;
> + };
> + };
> +
> + ldo21_reg: LDO21 {
> + regulator-name = "VDD_CAM_IO_1V8";
> + regulator-min-microvolt = <1800000>;
> + regulator-max-microvolt = <1800000>;
> +
> + regulator-state-mem {
> + regulator-off-in-suspend;
> + };
> + };
> +
> + ldo22_reg: LDO22 {
> + regulator-name = "VDD_CAM0_S_CORE_1V1";
> + regulator-min-microvolt = <1050000>;
> + regulator-max-microvolt = <1200000>;
> +
> + regulator-state-mem {
> + regulator-off-in-suspend;
> + };
> + };
> +
> + ldo23_reg: LDO23 {
> + regulator-name = "VDD_MIFS_1V1";
> + regulator-min-microvolt = <800000>;
> + regulator-max-microvolt = <1100000>;
> + regulator-always-on;
> +
> + regulator-state-mem {
> + regulator-on-in-suspend;
> + };
> + };
> +
> + ldo24_reg: LDO24 {
> + regulator-name = "VDD_TSP_3V3";
> + regulator-min-microvolt = <3300000>;
> + regulator-max-microvolt = <3300000>;
> +
> + regulator-state-mem {
> + regulator-off-in-suspend;
> + };
> + };
> +
> + ldo25_reg: LDO25 {
> + /* Unused */
> + regulator-name = "VDD_LDO25";
> + regulator-min-microvolt = <800000>;
> + regulator-max-microvolt = <3950000>;
> + };
> +
> + ldo26_reg: LDO26 {
> + regulator-name = "VDD_CAM0_AF_2V8";
> + regulator-min-microvolt = <2800000>;
> + regulator-max-microvolt = <2800000>;
> +
> + regulator-state-mem {
> + regulator-off-in-suspend;
> + };
> + };
> +
> + ldo27_reg: LDO27 {
> + regulator-name = "VDD_G3DS_1V0";
> + regulator-min-microvolt = <800000>;
> + regulator-max-microvolt = <1000000>;
> + regulator-always-on;
> +
> + regulator-state-mem {
> + regulator-on-in-suspend;
> + };
> + };
> +
> + /*
> + * LDO28 and LDO29 varies between devices and
> + * are specified in the device dts
> + */
> +
> + ldo30_reg: LDO30 {
> + regulator-name = "VDD_TOUCH_1V8";
> + regulator-min-microvolt = <1900000>;
> + regulator-max-microvolt = <1900000>;

Name is 1.8V, voltage is 1.9V. Double check this one :)

> +
> + regulator-state-mem {
> + regulator-off-in-suspend;
> + };
> + };
> +
> + ldo31_reg: LDO31 {
> + regulator-name = "VDD_GRIP_1V8";
> + regulator-min-microvolt = <1800000>;
> + regulator-max-microvolt = <1800000>;
> + regulator-always-on;
> + regulator-boot-on;
> +
> + regulator-state-mem {
> + regulator-off-in-suspend;
> + };
> + };
> +
> + ldo32_reg: LDO32 {
> + regulator-name = "VDD_TSP_1V8";
> + regulator-min-microvolt = <1900000>;
> + regulator-max-microvolt = <1900000>;
> +
> + regulator-state-mem {
> + regulator-off-in-suspend;
> + };
> + };
> +
> + ldo33_reg: LDO33 {
> + regulator-name = "VDD_MHL_1V8";
> + regulator-min-microvolt = <1800000>;
> + regulator-max-microvolt = <1800000>;
> +
> + regulator-state-mem {
> + regulator-off-in-suspend;
> + };
> + };
> +
> + ldo34_reg: LDO34 {
> + regulator-name = "VDD_MHL_3V3";
> + regulator-min-microvolt = <3300000>;
> + regulator-max-microvolt = <3300000>;
> +
> + regulator-state-mem {
> + regulator-off-in-suspend;
> + };
> + };
> +
> + ldo35_reg: LDO35 {
> + regulator-name = "VDD_SIL_1V2";
> + regulator-min-microvolt = <1200000>;
> + regulator-max-microvolt = <1200000>;
> +
> + regulator-state-mem {
> + regulator-off-in-suspend;
> + };
> + };
> +
> + ldo36_reg: LDO36 {
> + /* Unused */
> + regulator-name = "VDD_LDO36";
> + regulator-min-microvolt = <800000>;
> + regulator-max-microvolt = <3950000>;
> + };
> +
> + ldo37_reg: LDO37 {
> + /* Unused */
> + regulator-name = "VDD_LDO37";
> + regulator-min-microvolt = <800000>;
> + regulator-max-microvolt = <3950000>;
> + };
> +
> + ldo38_reg: LDO38 {
> + regulator-name = "VDD_KEY_LED_3V3";
> + regulator-min-microvolt = <2500000>;
> + regulator-max-microvolt = <3300000>;
> +
> + regulator-state-mem {
> + regulator-off-in-suspend;
> + };
> + };
> + };
> +};
> +
> +&mixer {
> + status = "okay";
> +};
> +
> +/* Internal storage */
> +&mmc_0 {
> + status = "okay";
> + non-removable;
> + card-detect-delay = <200>;
> + samsung,dw-mshc-ciu-div = <3>;
> + samsung,dw-mshc-sdr-timing = <0 4>;
> + samsung,dw-mshc-ddr-timing = <0 2>;
> + pinctrl-names = "default", "output";
> + clk_pin = &sd0_clk;
> + clk_val = <0x3>;

I think these two are not supported properties.

> + pinctrl-0 = <&sd0_clk &sd0_cmd &sd0_bus1 &sd0_bus4 &sd0_bus8>;
> + vmmc-supply = <&ldo3_reg>;
> + vqmmc-supply = <&ldo13_reg>;
> + bus-width = <8>;
> + cap-mmc-highspeed;
> + mmc-hs200-1_8v;
> +};
> +
> +/* External sdcard */
> +&mmc_2 {
> + status = "okay";
> + card-detect-delay = <200>;
> + samsung,dw-mshc-ciu-div = <3>;
> + samsung,dw-mshc-sdr-timing = <0 4>;
> + samsung,dw-mshc-ddr-timing = <0 2>;
> + bus-width = <4>;
> + cap-sd-highspeed;
> + sd-uhs-sdr50;

You should define here also pins, something like Arndale Octa has.

> +};
> +
> +&pinctrl_0 {
> + s2mps11_irq: s2mps11-irq-pins {
> + samsung,pins = "gpx3-2";
> + samsung,pin-function = <EXYNOS_PIN_FUNC_F>;
> + samsung,pin-pud = <EXYNOS_PIN_PULL_NONE>;
> + samsung,pin-drv = <EXYNOS5420_PIN_DRV_LV1>;
> + };
> +};
> +


Best regards,
Krzysztof