PATH[1/3] ARM: axp20x_usb_power.c add device tree configuration options for REG 30H: VBUS-IPSOUT
From: Lee Jones <hidden>
Date: 2016-05-18 07:21:33
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The AXP20X chips have a configuration register "REG 30H: VBUS-IPSOUT Power Path Management" that provide USB power supply protection. The current axp20x_usb_power.c provides support only for reading those values. From the datasheet: In order not to affect the USB communication, VBUS is always working under Voltage-Limit mode by default. In this mode, AXP209 ensures that VBUS voltage remains above a configurable reference voltage VHOLD which can meet the USB specification. The default VHOLD is 4.4V, adjustable in Reg30H [5:3] register. If the system has limit on current obtained from USB VBUS, a current-limit mode is provided (See REG30H[1] register), with 900mA/500mA/100mA (Reg30H [0]) selectable. The following entries are added in the axp209.dtsi file: vhold-enable, vhold-set and ibus-limit The chosen default values are the AXP20X reset values, as described in the data sheet. Signed-off-by: Ene Alexandru <redacted> --- diff -uprN -X linux-sunxi-original/Documentation/dontdiff linux-sunxi-original/arch/arm/boot/dts/axp209.dtsi linux-sunxi/arch/arm/boot/dts/axp209.dtsi--- linux-sunxi-original/arch/arm/boot/dts/axp209.dtsi 2016-05-1109:21:47.470923679 +0200+++ linux-sunxi/arch/arm/boot/dts/axp209.dtsi 2016-05-1018:45:32.795158651 +0200@@ -98,5 +98,8 @@ usb_power_supply: usb_power_supply { compatible = "x-powers,axp202-usb-power-supply"; status = "disabled"; + vhold-enable = <0x01>; + vhold-set = <0x04>; + ibus-limit = <0x01>; };}; ---
-- Lee Jones Linaro STMicroelectronics Landing Team Lead Linaro.org ? Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog