linux-kernel - Re: [PATCH v1 1/4] clk: tegra20: Add DEV1/DEV2 OSC dividers

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Message-ID: <440e71db-cd0b-c4d8-eb24-ac8ebec9ae75@gmail.com>
Date:   Thu, 3 May 2018 15:02:36 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Marcel Ziswiler <marcel@...wiler.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        Prashant Gaikwad <pgaikwad@...dia.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Marc Dietrich <marvin24@....de>
Cc:     linux-clk@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/4] clk: tegra20: Add DEV1/DEV2 OSC dividers

On 03.05.2018 14:59, Dmitry Osipenko wrote:
> On 27.04.2018 16:00, Marcel Ziswiler wrote:
>> On Fri, 2018-04-27 at 15:54 +0300, Dmitry Osipenko wrote:
>>> Hi Marcel,
>>>
>>> On 27.04.2018 15:33,  Ziswiler wrote:
>>>> Hi Dmitry
>>>>
>>>> Isn't the CLK_RST_CONTROLLER_MISC_CLK_ENB_0 the other way around
>>>> e.g.
>>>> DEV1_OSC_DIV_SEL at bit 23:22 and DEV2_OSC_DIV_SEL at 21:20?
>>>>
>>>> On Fri, 2018-04-27 at 02:58 +0300, Dmitry Osipenko wrote:
>>>>> CDEV1/CDEV2 clocks could have corresponding oscillator clock
>>>>> divider
>>>>> as
>>>>> a parent. Add these dividers in order to be able to provide that
>>>>> parent
>>>>> option.
>>>>>
>>>>> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
>>>>> ---
>>>>>  drivers/clk/tegra/clk-tegra20.c | 12 ++++++++++++
>>>>>  1 file changed, 12 insertions(+)
>>>>>
>>>>> diff --git a/drivers/clk/tegra/clk-tegra20.c
>>>>> b/drivers/clk/tegra/clk-
>>>>> tegra20.c
>>>>> index 0ee56dd04cec..16cf4108f2ff 100644
>>>>> --- a/drivers/clk/tegra/clk-tegra20.c
>>>>> +++ b/drivers/clk/tegra/clk-tegra20.c
>>>>> @@ -26,6 +26,8 @@
>>>>>  #include "clk.h"
>>>>>  #include "clk-id.h"
>>>>>  
>>>>> +#define MISC_CLK_ENB 0x48
>>>>> +
>>>>>  #define OSC_CTRL 0x50
>>>>>  #define OSC_CTRL_OSC_FREQ_MASK (3<<30)
>>>>>  #define OSC_CTRL_OSC_FREQ_13MHZ (0<<30)
>>>>> @@ -831,6 +833,16 @@ static void __init
>>>>> tegra20_periph_clk_init(void)
>>>>>  				    periph_clk_enb_refcnt);
>>>>>  	clks[TEGRA20_CLK_PEX] = clk;
>>>>>  
>>>>> +	/* cdev1 OSC divider */
>>>>> +	clk_register_divider(NULL, "cdev1_osc_div", "clk_m",
>>>>> +			     0, clk_base + MISC_CLK_ENB, 20, 2,
>>>>
>>>> So it would be:
>>>>
>>>> +			     0, clk_base + MISC_CLK_ENB, 22, 2,
>>>>
>>>>> +			     CLK_DIVIDER_POWER_OF_TWO, NULL);
>>>>> +
>>>>> +	/* cdev2 OSC divider */
>>>>> +	clk_register_divider(NULL, "cdev2_osc_div", "clk_m",
>>>>> +			     0, clk_base + MISC_CLK_ENB, 22, 2,
>>>>
>>>> And:
>>>>
>>>> +			     0, clk_base + MISC_CLK_ENB, 20, 2,
>>>>
>>>>> +			     CLK_DIVIDER_POWER_OF_TWO, NULL);
>>>>> +
>>>>>  	/* cdev1 */
>>>>>  	clk = clk_register_fixed_rate(NULL, "cdev1_fixed", NULL,
>>>>> 0,
>>>>> 26000000);
>>>>>  	clk = tegra_clk_register_periph_gate("cdev1",
>>>>> "cdev1_fixed",
>>>>> 0,
>>>
>>> Indeed, good catch! I'll wait for more comments and then re-spin
>>> patchset with
>>> the fix. Thank you.
>>
>> You are very welcome. Thank you!
>>
>> Other than that it all looks proper and works fine at least in the
>> configuration we use on Colibri T20. So you may add my reviewed and
>> tested bys to the whole series:
>>
>> Reviewed-by: Marcel Ziswiler <marcel@...wiler.com>
>> Tested-by: Marcel Ziswiler <marcel@...wiler.com>
> 
> Marcel, you previously mentioned that reverting of your DT patch works for the
> Colibri now. Does that reverting also work for the 4.17 kernel? If yes, I may
> add stable tag to the revert-patch to get back paz00 working with 4.17. If it's
> not working, we should figure out why pll_p_out4 is getting disabled as it
> should be a distinct issue.

Oh, I just found that Thierry already asked to get this patches included into
4.17. Anyway would be nice to know if a sole DT revert works with 4.17 for you.