From f3799e93720b8b722944d86f7a2a0599f5a9d716 Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Fri, 17 May 2013 13:25:21 +0100 Subject: 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 Signed-off-by: Samuel Ortiz --- drivers/mfd/wm8994-core.c | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'drivers/mfd/wm8994-core.c') 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); -- cgit v1.2.3