From 2b4d9d2b001be2ff06be2ea5c52e9adaf85b0805 Mon Sep 17 00:00:00 2001 From: Russell King Date: Sat, 21 Jan 2012 18:24:17 +0000 Subject: MFD: ucb1x00-core: disable mcp clock when bus is not required The ucb1x00-core was leaving the mcp clock enabled indefinitely after probe. This needlessly wastes power. Add the necessary disables to ensure that the clock remains off when we don't need it. Acked-by: Jochen Friedrich Signed-off-by: Russell King --- drivers/mfd/ucb1x00-core.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/mfd/ucb1x00-core.c b/drivers/mfd/ucb1x00-core.c index 9f8ea52f0ca..ed2a4b2e518 100644 --- a/drivers/mfd/ucb1x00-core.c +++ b/drivers/mfd/ucb1x00-core.c @@ -554,16 +554,17 @@ static int ucb1x00_probe(struct mcp *mcp) mcp_enable(mcp); id = mcp_reg_read(mcp, UCB_ID); + mcp_disable(mcp); if (id != UCB_ID_1200 && id != UCB_ID_1300 && id != UCB_ID_TC35143) { printk(KERN_WARNING "UCB1x00 ID not found: %04x\n", id); - goto err_disable; + goto out; } ucb = kzalloc(sizeof(struct ucb1x00), GFP_KERNEL); ret = -ENOMEM; if (!ucb) - goto err_disable; + goto out; device_initialize(&ucb->dev); ucb->dev.class = &ucb1x00_class; @@ -581,7 +582,9 @@ static int ucb1x00_probe(struct mcp *mcp) if (ret) goto err_dev_add; + ucb1x00_enable(ucb); ucb->irq = ucb1x00_detect_irq(ucb); + ucb1x00_disable(ucb); if (ucb->irq == NO_IRQ) { dev_err(&ucb->dev, "IRQ probe failed\n"); ret = -ENODEV; @@ -633,8 +636,6 @@ static int ucb1x00_probe(struct mcp *mcp) device_del(&ucb->dev); err_dev_add: put_device(&ucb->dev); - err_disable: - mcp_disable(mcp); out: if (pdata && pdata->reset) pdata->reset(UCB_RST_PROBE_FAIL); -- cgit v1.2.3