mfd: Add power control interface for pm8606 chip

The reference group and internal oscillator are shared by sub-devs
like led, backlight and vibrator in PM8606 chip. Now introduce a
voting mechanism to enable/disable it.

Add pm8606_osc_enable() and pm8606_osc_disable() interface and
related defines to support this. This interface will be called by
vibrator led and backlight driver.The refernce group and internal
oscillator are enabled only when at least one of it's clients holds
it on or disabled only all the clients don't use it any more based
on the above mechanism.

Signed-off-by: Jett.Zhou <jtzhou@marvell.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/include/linux/mfd/88pm860x.h b/include/linux/mfd/88pm860x.h
index 8b583f3f7926..84d071ade1d8 100644
--- a/include/linux/mfd/88pm860x.h
+++ b/include/linux/mfd/88pm860x.h
@@ -263,6 +263,22 @@ enum {
 #define PM8607_PD_PREBIAS_MASK          (0x1F << 0)
 #define PM8607_PD_PRECHG_MASK           (7 << 5)
 
+#define PM8606_REF_GP_OSC_OFF         0
+#define PM8606_REF_GP_OSC_ON          1
+#define PM8606_REF_GP_OSC_UNKNOWN     2
+
+/* Clients of reference group and 8MHz oscillator in 88PM8606 */
+enum pm8606_ref_gp_and_osc_clients {
+        REF_GP_NO_CLIENTS       = 0,
+        WLED1_DUTY              = (1<<0), /*PF 0x02.7:0*/
+        WLED2_DUTY              = (1<<1), /*PF 0x04.7:0*/
+        WLED3_DUTY              = (1<<2), /*PF 0x06.7:0*/
+        RGB1_ENABLE             = (1<<3), /*PF 0x07.1*/
+        RGB2_ENABLE             = (1<<4), /*PF 0x07.2*/
+        LDO_VBR_EN              = (1<<5), /*PF 0x12.0*/
+        REF_GP_MAX_CLIENT       = 0xFFFF
+};
+
 /* Interrupt Number in 88PM8607 */
 enum {
         PM8607_IRQ_ONKEY,
@@ -298,6 +314,7 @@ enum {
 struct pm860x_chip {
         struct device           *dev;
         struct mutex            irq_lock;
+        struct mutex            osc_lock;
         struct i2c_client       *client;
         struct i2c_client       *companion;     /* companion chip client */
         struct regmap           *regmap;
@@ -305,11 +322,13 @@ struct pm860x_chip {
 
         int                     buck3_double;   /* DVC ramp slope double */
         unsigned short          companion_addr;
+        unsigned short          osc_vote;
         int                     id;
         int                     irq_mode;
         int                     irq_base;
         int                     core_irq;
         unsigned char           chip_version;
+        unsigned char           osc_status;
 
         unsigned int            wakeup_flag;
 };
@@ -370,6 +389,9 @@ struct pm860x_platform_data {
         int             num_regulators;
 };
 
+extern int pm8606_osc_enable(struct pm860x_chip *, unsigned short);
+extern int pm8606_osc_disable(struct pm860x_chip *, unsigned short);
+
 extern int pm860x_reg_read(struct i2c_client *, int);
 extern int pm860x_reg_write(struct i2c_client *, int, unsigned char);
 extern int pm860x_bulk_read(struct i2c_client *, int, int, unsigned char *);