linux-kernel - Re: [PATCH v4 27/39] clk: at91: sam9x7: add sam9x7 pmc driver

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Message-ID: <c6704551-dae1-4536-8da2-ad4764d34503@tuxon.dev>
Date: Mon, 18 Mar 2024 22:17:46 +0200
From: claudiu beznea <claudiu.beznea@...on.dev>
To: Varshini.Rajendran@...rochip.com, mturquette@...libre.com,
 sboyd@...nel.org, Nicolas.Ferre@...rochip.com,
 alexandre.belloni@...tlin.com, linux-kernel@...r.kernel.org,
 linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 27/39] clk: at91: sam9x7: add sam9x7 pmc driver



On 18.03.2024 11:25, Varshini.Rajendran@...rochip.com wrote:
> Hi Claudiu,
> 
> On 11/03/24 11:28 am, claudiu beznea wrote:
>> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
>>
>> On 23.02.2024 19:28, Varshini Rajendran wrote:
>>> Add a driver for the PMC clocks of sam9x7 Soc family.
>>>
>>> Signed-off-by: Varshini Rajendran <varshini.rajendran@...rochip.com>
>>> ---
>>> Changes in v4:
>>> - Changed variable name alloc_mem to clk_mux_buffer to be more
>>>    suggestive
>>> - Changed description of @f structure member appropriately
>>> ---
>>>   drivers/clk/at91/Makefile |   1 +
>>>   drivers/clk/at91/sam9x7.c | 946 ++++++++++++++++++++++++++++++++++++++
>>>   2 files changed, 947 insertions(+)
>>>   create mode 100644 drivers/clk/at91/sam9x7.c
>>>
>>> diff --git a/drivers/clk/at91/Makefile b/drivers/clk/at91/Makefile
>>> index 89061b85e7d2..8e3684ba2c74 100644
>>> --- a/drivers/clk/at91/Makefile
>>> +++ b/drivers/clk/at91/Makefile
[ ... ]

>>> +static const struct {
>>> +     const char *n;
>>> +     const char *p;
>>> +     const struct clk_pll_layout *l;
>>> +     u8 t;
>>> +     const struct clk_pll_characteristics *c;
>>> +     unsigned long f;
>>> +     u8 eid;
>>> +} sam9x7_plls[][PLL_ID_MAX] = {
>>> +     [PLL_ID_PLLA] = {
>>> +             {
>>> +                     .n = "plla_fracck",
>>> +                     .p = "mainck",
>>> +                     .l = &plla_frac_layout,
>>> +                     .t = PLL_TYPE_FRAC,
>>> +                     /*
>>> +                      * This feeds plla_divpmcck which feeds CPU. It should
>>> +                      * not be disabled.
>>> +                      */
>>> +                     .f = CLK_IS_CRITICAL | CLK_SET_RATE_GATE,
>>> +                     .c = &plla_characteristics,
>>> +             },
>>> +
>>> +             {
>>> +                     .n = "plla_divpmcck",
>>> +                     .p = "plla_fracck",
>>> +                     .l = &pll_divpmc_layout,
>>
>> You mentioned in "[PATCH v4 24/39] clk: at91: sam9x7: add support for HW
>> PLL freq dividers" that this has div2 but it is registered w/ a layout that
>> has .div2 = 0.
> 
> This is handled in the above plla_fracck fractional part as defined in 
> the plla_frac_layout.

Ah, right. I missed the changes in sam9x60_frac_pll_recalc_rate().