Re: [PATCH 2/2] clk: rockchip: fix incorrect parent for rk3399's {c,g}pll_aclk_perihp_src

[Xing Zheng <zhengxing@rock-chips.com>]

Hi Doug,
     It is so sorry that our IC folks re-correct these bits, they need 
to be recovered like these:
----
In the definition of CRU_CLKGATE_CON5:
     bit 1 - shows aclk_perihp_cpll_src_en
     bit 0 - shows aclk_perihp_gpll_src_en
----
     And the new TRM will be updated.

     FYI.

Thanks.

On 2016年05月16日 23:49, Doug Anderson wrote:
> Hi,
>
> On Fri, May 13, 2016 at 8:36 PM, Xing Zheng <zhengxing@rock-chips.com> wrote:
>> Hi Doug,
>>
>>
>> On 2016年05月14日 04:10, Doug Anderson wrote:
>>> Hi,
>>>
>>> On Fri, May 13, 2016 at 11:42 AM, Brian Norris <briannorris@chromium.org>
>>> wrote:
>>>> From: Xing Zheng <zhengxing@rock-chips.com>
>>>>
>>>> There was a typo, swapping 'c' <--> 'g'.
>>>>
>>>> Signed-off-by: Xing Zheng <zhengxing@rock-chips.com>
>>>> Signed-off-by: Brian Norris <briannorris@chromium.org>
>>>> ---
>>>>    drivers/clk/rockchip/clk-rk3399.c | 4 ++--
>>>>    1 file changed, 2 insertions(+), 2 deletions(-)
>>>>
>>>> diff --git a/drivers/clk/rockchip/clk-rk3399.c
>>>> b/drivers/clk/rockchip/clk-rk3399.c
>>>> index 145756c4f3c8..9f86bfef70f7 100644
>>>> --- a/drivers/clk/rockchip/clk-rk3399.c
>>>> +++ b/drivers/clk/rockchip/clk-rk3399.c
>>>> @@ -832,9 +832,9 @@ static struct rockchip_clk_branch
>>>> rk3399_clk_branches[] __initdata = {
>>>>                           RK3399_CLKGATE_CON(13), 1, GFLAGS),
>>>>
>>>>           /* perihp */
>>>> -       GATE(0, "cpll_aclk_perihp_src", "gpll", CLK_IGNORE_UNUSED,
>>>> +       GATE(0, "cpll_aclk_perihp_src", "cpll", CLK_IGNORE_UNUSED,
>>>>                           RK3399_CLKGATE_CON(5), 0, GFLAGS),
>>>> -       GATE(0, "gpll_aclk_perihp_src", "cpll", CLK_IGNORE_UNUSED,
>>>> +       GATE(0, "gpll_aclk_perihp_src", "gpll", CLK_IGNORE_UNUSED,
>>>>                           RK3399_CLKGATE_CON(5), 1, GFLAGS),
>>>>           COMPOSITE(ACLK_PERIHP, "aclk_perihp", mux_aclk_perihp_p,
>>>> CLK_IGNORE_UNUSED,
>>>>                           RK3399_CLKSEL_CON(14), 7, 1, MFLAGS, 0, 5,
>>>> DFLAGS,
>>> Definitely there was a bug since this table itself was inconsistent.
>>> ...and I _think_ this fix is correct, but I'll note that the TRM has
>>> more inconsistency here.
>>>
>>> In the big clock table 'CRU Clock Architecture Diagram', I see:
>>>     CLK 4 is CPLL
>>>     CLK 5 is GPLL
>>>     CLK 125 is aclk_perihp_cpll_src and has 4 (CPLL) as source, with
>>> g5[0] as the bit
>>>     CLK 126 is aclk_perihp_gpll_src and has 5 (GPLL) as source, with
>>> g5[1] as the bit
>>>
>>> In the definition of CRU_CLKGATE_CON5:
>>>     bit 0 shows aclk_perihp_gpll_src_en
>>>     bit 1 shows aclk_perihp_cpll_src_en
>>>
>>>
>>> Thus the table shows CPLL as gate5[0] and GPLL as gate5[1].  The
>>> register definition shows the opposite.  I'll tend to believe the
>>> table over the register definition, but I figured I'd bring it up
>>> anyway.
>>>
>>>
>>> Xing Zheng: can you confirm that the table is correct and ask
>>> documentation folks to fix the register definition for
>>> CRU_CLKGATE_CON5?
>> Yes, previously, our IC & DOC partner confirmed that the definition of
>> CRU_CLKGATE_CON5 should be:
>>    bit 0 shows aclk_perihp_cpll_src_en
>>    bit 1 shows aclk_perihp_gpll_src_en
>>
>> Sorry to the incorrect register definition, we will fix them and review the
>> TRM again.
> Great!
>
> Since we now have extra confirmation that Brian's patch is indeed correct:
>
> Reviewed-by: Douglas Anderson <dianders@chromium.org>
>
>
>

-- 
- Xing Zheng