Re: [PATCH 3/3] ARM: OMAP: AM35xx: fix UART4 softreset

Cousson, Benoit
2012-05-11T09:32:55Z

On 5/11/2012 11:22 AM, Paul Walmsley wrote:
> Hi Benoît
>
> On Fri, 11 May 2012, Cousson, Benoit wrote:
>
>> I do not have any clue about that chip, but is this clock really what it is
>> supposed to be? I mean, isn't the uart1_fck the parent of all the UART fck or
>> something like that. Don't we just have an issue becasue the clock names are
>> not accurate?
>
> I guess that's what I'm trying to find out.
>
> According to the AM3517 TRM rev. B (SPRUGR0B) Figure 14-20 "UART
> Functional Integration" and Table 14-11 "UART Clocks", all of the UARTs
> appear to have independent functional clocks. The table even mentions a
> CM_FCLKEN1_CORE.EN_UART4 bit. But the PRCM chapter of this TRM doesn't
> mention that at all. So the documentation is not too useful here.
>
> On the rest of the OMAPs, as far as I know, the UART clocks are all
> separate.

In fact, not really. The same PER_48M_GFCLK clock is used for every UART
instances in OMAP4. We do have a separate modulemode for each UART but
as far as clocks are concerned, the source clock is the same.

Regards,
Benoit
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