mfd: wm8994: Reset device during probe

Ensure that the device is in a known good state. This should have little
practical impact as the runtime PM will reset the device shortly after
probe but it's neater.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

diff --git a/drivers/mfd/wm8994-core.c b/drivers/mfd/wm8994-core.c
index 00e4fe2f3c75cf0d4c6300972fbe331ad5825052..ccdddf9190694ab18613a43ed11b54f33620762e 100644 (file)
--- a/drivers/mfd/wm8994-core.c
+++ b/drivers/mfd/wm8994-core.c
@@ -652,6 +652,17 @@ static int wm8994_device_init(struct wm8994 *wm8994, int irq)
                return ret;
        }
 
+       /* Explicitly put the device into reset in case regulators
+        * don't get disabled in order to ensure we know the device
+        * state.
+        */
+       ret = wm8994_reg_write(wm8994, WM8994_SOFTWARE_RESET,
+                              wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET));
+       if (ret != 0) {
+               dev_err(wm8994->dev, "Failed to reset device: %d\n", ret);
+               return ret;
+       }
+
        if (regmap_patch) {
                ret = regmap_register_patch(wm8994->regmap, regmap_patch,
                                            patch_regs);