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

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Message-ID: <1jy145qnil.fsf@starbuckisacylon.baylibre.com>
Date: Fri, 06 Sep 2024 08:55:46 +0200
From: Jerome Brunet <jbrunet@...libre.com>
To: 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>,  chuan.liu@...ogic.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 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 ?

>
> 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