linux-kernel - Re: [PATCH v2 1/3] clk: samsung: introduce nMUX for MUX clks that can reparented

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Date: Thu, 28 Mar 2024 10:56:29 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Tudor Ambarus <tudor.ambarus@...aro.org>, peter.griffin@...aro.org
Cc: alim.akhtar@...sung.com, linux-arm-kernel@...ts.infradead.org,
 linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
 andre.draszik@...aro.org, willmcvicker@...gle.com, kernel-team@...roid.com,
 s.nawrocki@...sung.com, cw00.choi@...sung.com, mturquette@...libre.com,
 sboyd@...nel.org, semen.protsenko@...aro.org, linux-clk@...r.kernel.org,
 jaewon02.kim@...sung.com
Subject: Re: [PATCH v2 1/3] clk: samsung: introduce nMUX for MUX clks that can
 reparented

On 26/03/2024 18:28, Tudor Ambarus wrote:
> All samsung MUX clocks that are defined with MUX() set the
> CLK_SET_RATE_NO_REPARENT flag in __MUX(), which prevents MUXes to be
> reparented during clk_set_rate().
> 
> Introduce nMUX() for MUX clocks that can be reparented. One user of
> nMUX() will be GS101. GS101 defines MUX clocks that are dedicated for
> each instance of an IP (see MUX USI). The reparenting of these MUX clocks
> will not affect other instances of the same IP or different IPs
> altogether.
> 
> Signed-off-by: Tudor Ambarus <tudor.ambarus@...aro.org>
> ---
>  drivers/clk/samsung/clk.h | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
> 
> diff --git a/drivers/clk/samsung/clk.h b/drivers/clk/samsung/clk.h
> index a70bd7cce39f..01f58b7686db 100644
> --- a/drivers/clk/samsung/clk.h
> +++ b/drivers/clk/samsung/clk.h
> @@ -146,6 +146,26 @@ struct samsung_mux_clock {
>  #define MUX_F(_id, cname, pnames, o, s, w, f, mf)		\
>  	__MUX(_id, cname, pnames, o, s, w, f, mf)
>  
> +/* Used by MUX clocks where reparenting is allowed. */

..where reparenting on clock rate change is allowed

Because otherwise this suggest muxes cannot change :)

No need to resend just for this, I can fix it while applying. Still
waiting for some review, till EOD.


Best regards,
Krzysztof