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>

1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/mfd/wm8994-core.c b/drivers/mfd/wm8994-core.c
index 00e4fe2f3c75..ccdddf919069 100644
--- 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);