From 69fb4dcada7704beeba86e3f401a66c726aa8504 Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Sat, 1 Aug 2015 10:39:38 +0200 Subject: power: Add an axp20x-usb-power driver MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This adds a driver for the usb power_supply bits of the axp20x PMICs. I initially started writing my own driver, before coming aware of Bruno Prémont's excellent earlier RFC with a driver for this. My driver was lacking CURRENT_MAX and VOLTAGE_MIN support Bruno's drvier has, so I've copied the code for those from his driver. Note that the AC-power-supply and battery charger bits will need separate drivers. Each one needs its own devictree child-node so that other devicetree nodes can reference the right power-supply, and thus each one will get its own mfd-cell / platform_device and platform-driver. Cc: Bruno Prémont Acked-by: Lee Jones Signed-off-by: Bruno Prémont Signed-off-by: Hans de Goede Signed-off-by: Sebastian Reichel --- include/linux/mfd/axp20x.h | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) (limited to 'include/linux/mfd/axp20x.h') diff --git a/include/linux/mfd/axp20x.h b/include/linux/mfd/axp20x.h index cc8ad1e1a307..b24c771cebd5 100644 --- a/include/linux/mfd/axp20x.h +++ b/include/linux/mfd/axp20x.h @@ -11,6 +11,8 @@ #ifndef __LINUX_MFD_AXP20X_H #define __LINUX_MFD_AXP20X_H +#include + enum { AXP152_ID = 0, AXP202_ID, @@ -438,4 +440,26 @@ struct axp288_extcon_pdata { struct gpio_desc *gpio_mux_cntl; }; +/* generic helper function for reading 9-16 bit wide regs */ +static inline int axp20x_read_variable_width(struct regmap *regmap, + unsigned int reg, unsigned int width) +{ + unsigned int reg_val, result; + int err; + + err = regmap_read(regmap, reg, ®_val); + if (err) + return err; + + result = reg_val << (width - 8); + + err = regmap_read(regmap, reg + 1, ®_val); + if (err) + return err; + + result |= reg_val; + + return result; +} + #endif /* __LINUX_MFD_AXP20X_H */ -- cgit v1.2.3