Both Exynos5420 Peach Pit and Exynos5800 Peach Pi boards have a tps65090 PMU that has a number of switches (FETs) that are just on/off devices but they do have a current limit and the output voltage of the switch is ramped up within a controlled slope.
After the switch is turned on, a safety timer is started and before this timer times out the output voltage must have reached the input voltage. Otherwise the switch is turned off expecting an overload condition. So using the maximum output voltage slew rate and the timer minimum and maximum timeouts, a voltage constraints can be expressed as bounded limits for the timeout. That is what is used in the board schematics and should be in the DT too. Signed-off-by: Javier Martinez Canillas <[email protected]> --- arch/arm/boot/dts/exynos5420-peach-pit.dts | 14 ++++++++++++++ arch/arm/boot/dts/exynos5800-peach-pi.dts | 14 ++++++++++++++ 2 files changed, 28 insertions(+) diff --git a/arch/arm/boot/dts/exynos5420-peach-pit.dts b/arch/arm/boot/dts/exynos5420-peach-pit.dts index d8710c1..eefafe6 100644 --- a/arch/arm/boot/dts/exynos5420-peach-pit.dts +++ b/arch/arm/boot/dts/exynos5420-peach-pit.dts @@ -386,27 +386,41 @@ }; tps65090_fet1: fet1 { regulator-name = "vcd_led"; + regulator-min-microvolt = <5000000>; + regulator-max-microvolt = <1700000>; }; tps65090_fet2: fet2 { regulator-name = "video_mid"; + regulator-min-microvolt = <4500000>; + regulator-max-microvolt = <5500000>; regulator-always-on; }; tps65090_fet3: fet3 { regulator-name = "wwan_r"; + regulator-min-microvolt = <3000000>; + regulator-max-microvolt = <5500000>; regulator-always-on; }; tps65090_fet4: fet4 { regulator-name = "sdcard"; + regulator-min-microvolt = <3000000>; + regulator-max-microvolt = <5500000>; regulator-always-on; }; tps65090_fet5: fet5 { regulator-name = "camout"; + regulator-min-microvolt = <3000000>; + regulator-max-microvolt = <5500000>; }; tps65090_fet6: fet6 { regulator-name = "lcd_vdd"; + regulator-min-microvolt = <3000000>; + regulator-max-microvolt = <5500000>; }; tps65090_fet7: fet7 { regulator-name = "video_mid_1a"; + regulator-min-microvolt = <3000000>; + regulator-max-microvolt = <5500000>; regulator-always-on; }; tps65090_ldo1: ldo1 { diff --git a/arch/arm/boot/dts/exynos5800-peach-pi.dts b/arch/arm/boot/dts/exynos5800-peach-pi.dts index 07b29b7..5c38bc0 100644 --- a/arch/arm/boot/dts/exynos5800-peach-pi.dts +++ b/arch/arm/boot/dts/exynos5800-peach-pi.dts @@ -384,27 +384,41 @@ }; tps65090_fet1: fet1 { regulator-name = "vcd_led"; + regulator-min-microvolt = <5000000>; + regulator-max-microvolt = <1700000>; }; tps65090_fet2: fet2 { regulator-name = "video_mid"; + regulator-min-microvolt = <4500000>; + regulator-max-microvolt = <5500000>; regulator-always-on; }; tps65090_fet3: fet3 { regulator-name = "wwan_r"; + regulator-min-microvolt = <3000000>; + regulator-max-microvolt = <5500000>; regulator-always-on; }; tps65090_fet4: fet4 { regulator-name = "sdcard"; + regulator-min-microvolt = <3000000>; + regulator-max-microvolt = <5500000>; regulator-always-on; }; tps65090_fet5: fet5 { regulator-name = "camout"; + regulator-min-microvolt = <3000000>; + regulator-max-microvolt = <5500000>; }; tps65090_fet6: fet6 { regulator-name = "lcd_vdd"; + regulator-min-microvolt = <3000000>; + regulator-max-microvolt = <5500000>; }; tps65090_fet7: fet7 { regulator-name = "video_mid_1a"; + regulator-min-microvolt = <3000000>; + regulator-max-microvolt = <5500000>; regulator-always-on; }; tps65090_ldo1: ldo1 { -- 2.0.0.rc2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
