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authorMark Brown <broonie@opensource.wolfsonmicro.com>2009-09-22 08:47:11 -0700
committerLiam Girdwood <lrg@slimlogic.co.uk>2009-12-17 10:27:22 +0000
commite24a04c44cf312e88b50006a91ad7ffc1c0d97a5 (patch)
treea8f4b9c2f5caaed9646a1118b8d9cd84de134439 /include/linux/mfd/wm831x
parent27f37e4bfed803be338dcc78845d4a67eefb40a0 (diff)
regulator: Implement WM831x BuckWise DC-DC convertor DVS support
The BuckWise DC-DC convertors in WM831x devices support switching to a second output voltage using the logic level on one of the device pins. This is intended to allow rapid voltage switching for uses like cpufreq, replacing the I2C or SPI write used to configure the voltage of the regulator with a much faster GPIO status change. This is implemented by keeping the DVS voltage configured as the maximum voltage permitted for the regulator. If a request is made for the maximum voltage then the GPIO is used to switch to the DVS voltage, otherwise the normal ON voltage is updated and used. This follows the idiom used by most cpufreq drivers, which drop the minimum voltage as the core frequency is dropped but use a constant maximum - raising the voltage should normally be fast, but lowering it may be slower. Configuration of the DVS MFP on the device should be done externally, for example via OTP. Support is present in the hardware for monitoring the status of the transition using a second GPIO. This is not currently implemented but platform data is provided for it - the driver currently assumes that the device will be configured to transition immediately - but platform data is provided to reduce merge issues once it is. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: Samuel Ortiz <sameo@linux.intel.com> Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
Diffstat (limited to 'include/linux/mfd/wm831x')
-rw-r--r--include/linux/mfd/wm831x/pdata.h17
1 files changed, 17 insertions, 0 deletions
diff --git a/include/linux/mfd/wm831x/pdata.h b/include/linux/mfd/wm831x/pdata.h
index 415c228743d..fd322aca33b 100644
--- a/include/linux/mfd/wm831x/pdata.h
+++ b/include/linux/mfd/wm831x/pdata.h
@@ -41,6 +41,23 @@ struct wm831x_battery_pdata {
int timeout; /** Charge cycle timeout, in minutes */
};
+/**
+ * Configuration for the WM831x DC-DC BuckWise convertors. This
+ * should be passed as driver_data in the regulator_init_data.
+ *
+ * Currently all the configuration is for the fast DVS switching
+ * support of the devices. This allows MFPs on the device to be
+ * configured as an input to switch between two output voltages,
+ * allowing voltage transitions without the expense of an access over
+ * I2C or SPI buses.
+ */
+struct wm831x_buckv_pdata {
+ int dvs_gpio; /** CPU GPIO to use for DVS switching */
+ int dvs_control_src; /** Hardware DVS source to use (1 or 2) */
+ int dvs_init_state; /** DVS state to expect on startup */
+ int dvs_state_gpio; /** CPU GPIO to use for monitoring status */
+};
+
/* Sources for status LED configuration. Values are register values
* plus 1 to allow for a zero default for preserve.
*/