mfd: Enable twl4030 32kHz oscillator low-power mode
authorIlkka Koskinen <ilkka.koskinen@nokia.com>
Thu, 22 Oct 2009 11:14:09 +0000 (14:14 +0300)
committerSamuel Ortiz <sameo@linux.intel.com>
Sun, 13 Dec 2009 18:21:33 +0000 (19:21 +0100)
Allows TWL's 32kHz oscillator to go in low-power mode when
main battery voltage is running low.

Signed-off-by: Ilkka Koskinen <ilkka.koskinen@nokia.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
drivers/mfd/twl4030-core.c
include/linux/i2c/twl4030.h

index e3abbf66cc5cfa64691c73a50bdb62a5c29f9e38..90a38e43c313ac242abc70231b9a8274c0f1fa82 100644 (file)
 #define HFCLK_FREQ_26_MHZ              (2 << 0)
 #define HFCLK_FREQ_38p4_MHZ            (3 << 0)
 #define HIGH_PERF_SQ                   (1 << 3)
+#define CK32K_LOWPWR_EN                        (1 << 7)
 
 
 /* chip-specific feature flags, for i2c_device_id.driver_data */
@@ -695,7 +696,8 @@ static inline int __init unprotect_pm_master(void)
        return e;
 }
 
-static void clocks_init(struct device *dev)
+static void clocks_init(struct device *dev,
+                       struct twl4030_clock_init_data *clock)
 {
        int e = 0;
        struct clk *osc;
@@ -742,6 +744,9 @@ static void clocks_init(struct device *dev)
        }
 
        ctrl |= HIGH_PERF_SQ;
+       if (clock && clock->ck32k_lowpwr_enable)
+               ctrl |= CK32K_LOWPWR_EN;
+
        e |= unprotect_pm_master();
        /* effect->MADC+USB ck en */
        e |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, ctrl, R_CFG_BOOT);
@@ -820,7 +825,7 @@ twl4030_probe(struct i2c_client *client, const struct i2c_device_id *id)
        inuse = true;
 
        /* setup clock framework */
-       clocks_init(&client->dev);
+       clocks_init(&client->dev, pdata->clock);
 
        /* load power event scripts */
        if (twl_has_power() && pdata->power)
index 8a4a58ff8dadc82f30ed01c22b6a90c829b5d894..0c84cfa059e95bfb91ba5ccbd7ac2c1c6d4a6265 100644 (file)
@@ -313,6 +313,10 @@ int twl4030_i2c_read(u8 mod_no, u8 *value, u8 reg, unsigned num_bytes);
 
 /*----------------------------------------------------------------------*/
 
+struct twl4030_clock_init_data {
+       bool ck32k_lowpwr_enable;
+};
+
 struct twl4030_bci_platform_data {
        int *battery_tmp_tbl;
        unsigned int tblsize;
@@ -425,6 +429,7 @@ struct twl4030_codec_data {
 
 struct twl4030_platform_data {
        unsigned                                irq_base, irq_end;
+       struct twl4030_clock_init_data          *clock;
        struct twl4030_bci_platform_data        *bci;
        struct twl4030_gpio_platform_data       *gpio;
        struct twl4030_madc_platform_data       *madc;