linux-kernel - Re: [PATCH] clk: sunxi-ng: sun6i-rtc: Mark rtc-32k as critical

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Message-ID: <2233461.ElGaqSPkdT@kista>
Date:   Mon, 11 Apr 2022 17:24:58 +0200
From:   Jernej Škrabec <jernej.skrabec@...il.com>
To:     Chen-Yu Tsai <wens@...e.org>, Samuel Holland <samuel@...lland.org>
Cc:     Andre Przywara <andre.przywara@....com>,
        Samuel Holland <samuel@...lland.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-sunxi@...ts.linux.dev
Subject: Re: [PATCH] clk: sunxi-ng: sun6i-rtc: Mark rtc-32k as critical

Dne ponedeljek, 11. april 2022 ob 07:00:59 CEST je Samuel Holland napisal(a):
> Because some newer hardware variants have multiple possible parents for
> the RTC's timekeeping clock, this driver models it as a "rtc-32k" clock.
> However, it does not add any consumer for this clock. This causes the
> common clock framework to disable it, preventing RTC time access.
> 
> Since the RTC's timekeeping clock should always be enabled, regardless
> of which drivers are loaded, let's mark this clock as critical instead
> of adding a consumer in the RTC driver.
> 
> Fixes: d91612d7f01a ("clk: sunxi-ng: Add support for the sun6i RTC clocks")
> Signed-off-by: Samuel Holland <samuel@...lland.org>

Acked-by: Jernej Skrabec <jernej.skrabec@...il.com>

Best regards,
Jernej

> ---
> 
>  drivers/clk/sunxi-ng/ccu-sun6i-rtc.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/clk/sunxi-ng/ccu-sun6i-rtc.c b/drivers/clk/sunxi-ng/ccu-
sun6i-rtc.c
> index 8a10bade7e0d..3d9c9ce5a3db 100644
> --- a/drivers/clk/sunxi-ng/ccu-sun6i-rtc.c
> +++ b/drivers/clk/sunxi-ng/ccu-sun6i-rtc.c
> @@ -241,6 +241,7 @@ static struct clk_init_data rtc_32k_init_data = {
>  	.ops		= &ccu_mux_ops,
>  	.parent_hws	= rtc_32k_parents,
>  	.num_parents	= ARRAY_SIZE(rtc_32k_parents), /* updated 
during probe */
> +	.flags		= CLK_IS_CRITICAL,
>  };
>  
>  static struct ccu_mux rtc_32k_clk = {
> -- 
> 2.35.1
> 
>