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

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Date:   Thu, 3 May 2018 14:59:26 +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 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.