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i2c: omap: Fix error handling for clk_get() 

Otherwise we can get the following if the fck alias is missing:

Unable to handle kernel paging request at virtual address fffffffe
...
PC is at clk_get_rate+0x8/0x10
LR is at omap_i2c_probe+0x278/0x6ec
...
[<c056eb08>] (clk_get_rate) from [<c06f4f08>] (omap_i2c_probe+0x278/0x6ec)
[<c06f4f08>] (omap_i2c_probe) from [<c0610944>] (platform_drv_probe+0x50/0xb0)
[<c0610944>] (platform_drv_probe) from [<c060e900>] (driver_probe_device+0x264/0x2ec)
[<c060e900>] (driver_probe_device) from [<c060cda0>] (bus_for_each_drv+0x70/0xb8)
[<c060cda0>] (bus_for_each_drv) from [<c060e5b0>] (__device_attach+0xcc/0x13c)
[<c060e5b0>] (__device_attach) from [<c060db10>] (bus_probe_device+0x88/0x90)
[<c060db10>] (bus_probe_device) from [<c060df68>] (deferred_probe_work_func+0x4c/0x14c)

Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Tony Lindgren 2017-10-16 14:06:14 -07:00 committed by Wolfram Sang
parent 88fa2dfb07
commit 883b3b6567
1 changed files with 14 additions and 0 deletions
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14
drivers/i2c/busses/i2c-omap.c
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@ -360,6 +360,7 @@ static int omap_i2c_init(struct omap_i2c_dev *omap)
unsigned long fclk_rate = 12000000;
unsigned long internal_clk = 0;
struct clk *fclk;
int error;
if (omap->rev >= OMAP_I2C_REV_ON_3430_3530) {
/*
@ -378,6 +379,13 @@ static int omap_i2c_init(struct omap_i2c_dev *omap)
* do this bit unconditionally.
*/
fclk = clk_get(omap->dev, "fck");
if (IS_ERR(fclk)) {
error = PTR_ERR(fclk);
dev_err(omap->dev, "could not get fck: %i\n", error);
return error;
}
fclk_rate = clk_get_rate(fclk);
clk_put(fclk);
@ -410,6 +418,12 @@ static int omap_i2c_init(struct omap_i2c_dev *omap)
else
internal_clk = 4000;
fclk = clk_get(omap->dev, "fck");
if (IS_ERR(fclk)) {
error = PTR_ERR(fclk);
dev_err(omap->dev, "could not get fck: %i\n", error);
return error;
}
fclk_rate = clk_get_rate(fclk) / 1000;
clk_put(fclk);