linux-kernel - Re: [PATCH v2 2/3] ARM: OMAP2+: hwmod: AM335x/AM43x: add hwmod support for tscadc on am43x-evm

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Date:	Fri, 21 Nov 2014 15:46:14 +0530
From:	Vignesh R <vigneshr@...com>
To:	Paul Walmsley <paul@...an.com>
CC:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Tony Lindgren <tony@...mide.com>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>
Subject: Re: [PATCH v2 2/3] ARM: OMAP2+: hwmod: AM335x/AM43x: add hwmod support
 for tscadc on am43x-evm



On Friday 21 November 2014 10:56 AM, Paul Walmsley wrote:
> On Fri, 21 Nov 2014, Vignesh R wrote:
> 
>> On 11/20/2014 12:39 PM, Paul Walmsley wrote:
>>> On Tue, 4 Nov 2014, Vignesh R wrote:
>>>
>>>> This patch adds hwmod support for tscadc to work on am43xx-evm. The am33xx
>>>> hwmod structures of tscadc has been moved to ipblock_data so that it can
>>>> be reused in am43xx. The clock domain names are separately set for am33xx
>>>> and am43xx. Thus tscadc dt entries can now be added to am43xx board
>>>> dt files.
>>>>
>>>> Signed-off-by: Vignesh R <vigneshr@...com>
>>> ...
>>>
>>>> diff --git a/arch/arm/mach-omap2/omap_hwmod_33xx_43xx_common_data.h b/arch/arm/mach-omap2/omap_hwmod_33xx_43xx_common_data.h
>>>> index 6e57b8ad0db5..b92a7c7825fa 100644
>>>> --- a/arch/arm/mach-omap2/omap_hwmod_33xx_43xx_common_data.h
>>>> +++ b/arch/arm/mach-omap2/omap_hwmod_33xx_43xx_common_data.h
>>> ...
>>>
>>>> +static void am33xx_hwmod_clockdomain(void)
>>>> +{
>>>> +	CLKDMNAME(am33xx_l4_hs_hwmod, "l4hs_clkdm");
>>>> +	CLKDMNAME(am33xx_adc_tsc_hwmod, "l4_wkup_clkdm");
>>>> +}
>>>> +
>>>> +static void am43xx_hwmod_clockdomain(void)
>>>> +{
>>>> +	CLKDMNAME(am33xx_l4_hs_hwmod, "l3_clkdm");
>>>> +	CLKDMNAME(am33xx_adc_tsc_hwmod, "l3s_tsc_clkdm");
>>>> +}
>>>> +
>>> ...
>>>
>>>> +	am33xx_hwmod_clockdomain();
>>> I looked at this patch and the one before it.  Is there some reason why we 
>>> need to share these two hwmods between AM33xx and AM43xx?  It seems 
>>> cleaner just to add the ADC data directly to the AM43xx hwmod data file, 
>>> not touch the AM33xx data, and not add another runtime data update for the 
>>> clockdomains.  Unless there's something that I'm missing?
>>
>>
>> I wanted to reuse hwmod structures. Except for clockdomain and offset,
>> rest of the hwmod data are same for AM33xx and AM43xx. Adding data to AM43xx
>> hwmod file just duplicates these structures. Do you still want me to move them
>> to AM43xx file?
> 
> Yes.  It looks to me like the number of lines saved by eliminating the 
> duplication is not too different than the number of lines added with the 
> dynamic clockdomain rewriting.  Plus then we can avoid the dynamic 
> clockdomain rewriting that we are only doing for two IP blocks.  Ideally 
> the hwmod data is meant to be static, not changed at runtime.  For the 
> moment we are stuck with the CLKCTRL rewriting but I personally consider 
> that to be a hack.
> 

Ok, will add ADC data to AM43xx and post v3.

Regards
Vignesh

> 
> - Paul
> 
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