linux-kernel - Re: [PATCH 2/4] clk: meson: c3: pll: hifi

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Message-ID: <c2555924-8669-4aec-addd-da54fa4d34e2@amlogic.com>
Date: Fri, 6 Sep 2024 16:26:25 +0800
From: Chuan Liu <chuan.liu@...ogic.com>
To: Jerome Brunet <jbrunet@...libre.com>,
 Chuan Liu via B4 Relay <devnull+chuan.liu.amlogic.com@...nel.org>
Cc: Neil Armstrong <neil.armstrong@...aro.org>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd
 <sboyd@...nel.org>, Kevin Hilman <khilman@...libre.com>,
 Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
 linux-amlogic@...ts.infradead.org, linux-clk@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] clk: meson: c3: pll: hifi_pll frequency is not
 accurate


On 2024/9/6 14:55, Jerome Brunet wrote:
> [ EXTERNAL EMAIL ]
>
> On Fri 06 Sep 2024 at 13:52, Chuan Liu via B4 Relay <devnull+chuan.liu.amlogic.com@...nel.org> wrote:
>
>> From: Chuan Liu <chuan.liu@...ogic.com>
> The patch title is not good. the clock innacurate ... Ok, but you are doing
> something about it, right ? Plus just saying that is a bit vague.
>
> How about something like "fix frac maximum value" ? This what you are
> doing, right ?


Right, Fix in next version.


>> The fractional denominator of C3's hifi_pll fractional multiplier is
>> fixed to 100000, so flag CLK_MESON_PLL_FIXED_FRAC_MAX is added.
>>
>> Fixes: 8a9a129dc565 ("clk: meson: c3: add support for the C3 SoC PLL clock")
>> Signed-off-by: Chuan Liu <chuan.liu@...ogic.com>
>> ---
>>   drivers/clk/meson/c3-pll.c | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/clk/meson/c3-pll.c b/drivers/clk/meson/c3-pll.c
>> index 32bd2ed9d304..a350173efe90 100644
>> --- a/drivers/clk/meson/c3-pll.c
>> +++ b/drivers/clk/meson/c3-pll.c
>> @@ -361,6 +361,7 @@ static struct clk_regmap hifi_pll_dco = {
>>                .range = &c3_gp0_pll_mult_range,
>>                .init_regs = c3_hifi_init_regs,
>>                .init_count = ARRAY_SIZE(c3_hifi_init_regs),
>> +             .flags = CLK_MESON_PLL_FIXED_FRAC_MAX,
>>        },
>>        .hw.init = &(struct clk_init_data) {
>>                .name = "hifi_pll_dco",
> --
> Jerome