Commit bd6ca2cf authored by MyungJoo Ham's avatar MyungJoo Ham Committed by Samuel Ortiz
Browse files

regulator: MAX8997/8966 support 



This patch supports PMIC/Regulator part of MAX8997/MAX8966 MFD.
In this initial release, selecting voltages or current-limit
and switching on/off the regulators are supported.

Controlling voltages for DVS with GPIOs is not implemented fully
and requires more considerations: it controls multiple bucks (selection
of 1, 2, and 5) at the same time with SET1~3 gpios. Thus, when DVS-GPIO
is activated, we lose the ability to control the voltage of a single
buck regulator independently; i.e., contolling a buck affects other two
bucks. Therefore, using the conventional regulator framework directly
might be problematic. However, in this driver, we try to choose
a setting without such side effect of affecting other regulators and
then try to choose a setting with the minimum side effect (the sum of
voltage changes in other regulators).

On the other hand, controlling all the three bucks simultenously based
on the voltage set table may help build cpufreq and similar system
more robust; i.e., all the three voltages are consistent every time
without glitches during transition.

Signed-off-by: default avatarMyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: default avatarKyungmin Park <kyungmin.park@samsung.com>
Acked-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
parent e93c5387

drivers/regulator/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -108,6 +108,15 @@ config REGULATOR_MAX8952 
	  via I2C bus. Maxim 8952 has one voltage output and supports 4 DVS

	  modes ranging from 0.77V to 1.40V by 0.01V steps.



config REGULATOR_MAX8997

	tristate "Maxim 8997/8966 regulator"

	depends on MFD_MAX8997

	help

	  This driver controls a Maxim 8997/8966 regulator

	  via I2C bus. The provided regulator is suitable for S5PC110,

	  S5PV210, and Exynos-4 chips to control VCC_CORE and

	  VCC_USIM voltages.



config REGULATOR_MAX8998

	tristate "Maxim 8998 voltage regulator"

	depends on MFD_MAX8998

drivers/regulator/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ obj-$(CONFIG_REGULATOR_MAX8649) += max8649.o 
obj-$(CONFIG_REGULATOR_MAX8660) += max8660.o

obj-$(CONFIG_REGULATOR_MAX8925) += max8925-regulator.o

obj-$(CONFIG_REGULATOR_MAX8952) += max8952.o

obj-$(CONFIG_REGULATOR_MAX8997) += max8997.o

obj-$(CONFIG_REGULATOR_MAX8998) += max8998.o

obj-$(CONFIG_REGULATOR_WM831X) += wm831x-dcdc.o

obj-$(CONFIG_REGULATOR_WM831X) += wm831x-isink.o

drivers/regulator/max8997.c

0 → 100644
+1213 −0

File added.

Preview size limit exceeded, changes collapsed.

include/linux/mfd/max8997.h

+27 −1
Original line number Diff line number Diff line
@@ -68,6 +68,8 @@ enum max8998_regulators { 
	MAX8997_CHARGER_CV, /* control MBCCV of MBCCTRL3 */

	MAX8997_CHARGER, /* charger current, MBCCTRL4 */

	MAX8997_CHARGER_TOPOFF, /* MBCCTRL5 */



	MAX8997_REG_MAX,

};



struct max8997_regulator_data {
@@ -77,7 +79,31 @@ struct max8997_regulator_data { 


struct max8997_platform_data {

	bool wakeup;

	/* PMIC: Not implemented */

	/* IRQ: Not implemented */

	/* ---- PMIC ---- */

	struct max8997_regulator_data *regulators;

	int num_regulators;



	/*

	 * SET1~3 DVS GPIOs control Buck1, 2, and 5 simultaneously. Therefore,

	 * With buckx_gpiodvs enabled, the buckx cannot be controlled

	 * independently. To control buckx (of 1, 2, and 5) independently,

	 * disable buckx_gpiodvs and control with BUCKxDVS1 register.

	 *

	 * When buckx_gpiodvs and bucky_gpiodvs are both enabled, set_voltage

	 * on buckx will change the voltage of bucky at the same time.

	 *

	 */

	bool ignore_gpiodvs_side_effect;

	int buck125_gpios[3]; /* GPIO of [0]SET1, [1]SET2, [2]SET3 */

	int buck125_default_idx; /* Default value of SET1, 2, 3 */

	unsigned int buck1_voltage[8]; /* buckx_voltage in uV */

	bool buck1_gpiodvs;

	unsigned int buck2_voltage[8];

	bool buck2_gpiodvs;

	unsigned int buck5_voltage[8];

	bool buck5_gpiodvs;



	/* MUIC: Not implemented */

	/* HAPTIC: Not implemented */

	/* RTC: Not implemented */

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