[PATCH v7 6/7] clk: hi6220: Clock driver support for Hisilicon hi6220 SoC

[Brent Wang]

Hello Stephen,

2015-05-23 2:41 GMT+08:00 Stephen Boyd <sboyd at codeaurora.org>:
> On 05/22, Stephen Boyd wrote:
>> On 05/22/15 11:30, Brent Wang wrote:
>> > Hello Stephen,
>> >
>> > 2015-05-22 13:20 GMT+08:00 Bintian <bintian.wang at huawei.com>:
>> >>
>> >>>
>> >>> Is pl011 the uart device? Does it have a node in DT somewhere? If it
>> >>> does, then we could put the assigned-parents properties in that node so
>> >>> that when the pl011 probes the uart1 clock has its parent set to
>> >>> clk_150m. See the "Assigned clock parents and rates" section of
>> >>> Documentation/devicetree/bindings/clock/clock-bindings.txt.
>> >>>
>> >> I will verify this.
>> > Currently the "assigned-clock*" doesn't work for pl011 UART device
>> > node, maybe we will
>> > do some fix for its driver later or other modules.
>>
>> Why doesn't it work?
>>
>
> Does this patch help?
Yes, it works!

I also tested adding  "of_clk_set_defaults" to "pl011_probe()", and
"assigned-clock*"
also works.

So you will submit another patch to fix this problem and I can revove
the "clk_set_parent"
from my patch, right ?

Thanks,

Bintian
>
> ---8<----
> diff --git a/drivers/amba/bus.c b/drivers/amba/bus.c
> index f0099360039e..350ed93d4281 100644
> --- a/drivers/amba/bus.c
> +++ b/drivers/amba/bus.c
> @@ -19,6 +19,7 @@
>  #include <linux/amba/bus.h>
>  #include <linux/sizes.h>
>  #include <linux/limits.h>
> +#include <linux/clk/clk-conf.h>
>
>  #include <asm/irq.h>
>
> @@ -237,6 +238,10 @@ static int amba_probe(struct device *dev)
>         int ret;
>
>         do {
> +               ret = of_clk_set_defaults(dev->of_node, false);
> +               if (ret < 0)
> +                       break;
> +
>                 ret = dev_pm_domain_attach(dev, true);
>                 if (ret == -EPROBE_DEFER)
>                         break;
>
> --
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