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

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Date: Wed, 27 Mar 2024 08:09:44 +0000
From: Tudor Ambarus <tudor.ambarus@...aro.org>
To: André Draszik <andre.draszik@...aro.org>,
 peter.griffin@...aro.org, krzysztof.kozlowski@...aro.org
Cc: alim.akhtar@...sung.com, linux-arm-kernel@...ts.infradead.org,
 linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.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 3/26/24 17:43, André Draszik wrote:
> Hi Tudor,
> 

Hi, Andre'!

> On Tue, 2024-03-26 at 17:28 +0000, 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.
> 
> What does n in nMUX stand for?

I thought about using the common terminology, "n-to-1 multiplexer",
where n is the number of select lines. I'm open to other suggestions if
there are any. I should have specified the naming scheme in the commit
message, will do in the next version.
> 
>> [...]
>>  
>> +/* Used by MUX clocks where reparenting is allowed. */
>> +#define __nMUX(_id, cname, pnames, o, s, w, f, mf)		\
>> +	{							\
>> +		.id		= _id,				\
>> +		.name		= cname,			\
>> +		.parent_names	= pnames,			\
>> +		.num_parents	= ARRAY_SIZE(pnames),		\
>> +		.flags		= f,				\
>> +		.offset		= o,				\
>> +		.shift		= s,				\
>> +		.width		= w,				\
>> +		.mux_flags	= mf,				\
>> +	}
> 
> You've duplicated __MUX() and removed the CLK_SET_RATE_NO_REPARENT
> from flags - I think it would make sense to instead drop the flag
> from the existing __MUX(), and adjust the only two existing users
> of the macro, i.e. to add it in MUX() and MUX_F().
> 

Yes, I find the suggestion good. Will do in v3.

Thanks,
ta