On Fri, 18 Sep 2015, Tony Lindgren wrote:
> Commit 68bab8662f49 ("mfd: twl6040: Optional clk32k clock handling")
> added clock handling for the 32k clock from palmas-clk. However, that
> patch did not consider a typical situation where twl6040 is built-in,
> and palmas-clk is a loadable module like we have in omap2plus_defconfig.
>
> If palmas-clk is not loaded before twl6040 probes, we will get a
> "clk32k is not handled" warning during booting. This means that any
> drivers relying on this clock will mysteriously fail, including
> omap5-uevm WLAN and audio.
>
> Note that for WLAN, we probably should also eventually get
> the clk32kgaudio for MMC3 directly as that's shared between
> audio and WLAN SDIO at least for omap5-uevm. It seems the
> WLAN chip cannot get it as otherwise MMC3 won't get properly
> probed.
>
> Fixes: 68bab8662f49 ("mfd: twl6040: Optional clk32k clock handling")
> Cc: Benoit Cousson <bcousson@xxxxxxxxxxxx>
> Cc: Dr. H. Nikolaus Schaller <hns@xxxxxxxxxxxxx>
> Cc: Grazvydas Ignotas <notasas@xxxxxxxxx>
> Cc: Lee Jones <lee.jones@xxxxxxxxxx>
> Cc: Peter Ujfalusi <peter.ujfalusi@xxxxxx>
> Cc: Samuel Ortiz <sameo@xxxxxxxxxxxxxxx>
> Cc: Sourav Poddar <sourav.poddar@xxxxxx>
> Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>
> ---
> drivers/mfd/twl6040.c | 2 ++
> 1 file changed, 2 insertions(+)
Applied, thanks.
> --- a/drivers/mfd/twl6040.c
> +++ b/drivers/mfd/twl6040.c
> @@ -647,6 +647,8 @@ static int twl6040_probe(struct i2c_client *client,
>
> twl6040->clk32k = devm_clk_get(&client->dev, "clk32k");
> if (IS_ERR(twl6040->clk32k)) {
> + if (PTR_ERR(twl6040->clk32k) == -EPROBE_DEFER)
> + return -EPROBE_DEFER;
> dev_info(&client->dev, "clk32k is not handled\n");
> twl6040->clk32k = NULL;
> }
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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