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power: Add an axp20x-usb-power driver

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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 <bonbons@linux-vserver.org>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Bruno Prémont <bonbons@linux-vserver.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
This commit is contained in:
Hans de Goede 2015-08-01 10:39:38 +02:00 • committed by Sebastian Reichel
parent 264905209a
commit 69fb4dcada
4 changed files with 280 additions and 0 deletions
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24
include/linux/mfd/axp20x.h
View file

@ -11,6 +11,8 @@
#ifndef __LINUX_MFD_AXP20X_H
#define __LINUX_MFD_AXP20X_H
#include <linux/regmap.h>
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, &reg_val);
if (err)
return err;
result = reg_val << (width - 8);
err = regmap_read(regmap, reg + 1, &reg_val);
if (err)
return err;
result |= reg_val;
return result;
}
#endif /* __LINUX_MFD_AXP20X_H */