linux-kernel - Re: [PATCH v2 4/5] clk: cygnus: add clock support for Broadcom Cygnus

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Date:	Wed, 7 Jan 2015 09:33:25 -0800
From:	Ray Jui <rjui@...adcom.com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	<linux-arm-kernel@...ts.infradead.org>,
	Mike Turquette <mturquette@...aro.org>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Matt Porter <mporter@...aro.org>,
	Alex Elder <elder@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Russell King <linux@....linux.org.uk>,
	<devicetree@...r.kernel.org>,
	"Scott Branden" <sbranden@...adcom.com>,
	<linux-kernel@...r.kernel.org>,
	<bcm-kernel-feedback-list@...adcom.com>
Subject: Re: [PATCH v2 4/5] clk: cygnus: add clock support for Broadcom Cygnus



On 1/7/2015 1:11 AM, Arnd Bergmann wrote:
> On Tuesday 06 January 2015 18:29:07 Ray Jui wrote:
>> On 1/6/2015 12:21 PM, Arnd Bergmann wrote:
>>> On Monday 05 January 2015 15:21:15 Ray Jui wrote:
>>>> +static const struct iproc_asiu_gate asiu_gate[BCM_CYGNUS_NUM_ASIU_CLKS] = {
>>>> +	[BCM_CYGNUS_ASIU_KEYPAD_CLK] =
>>>> +		asiu_gate_val(0x0, 7),
>>>> +	[BCM_CYGNUS_ASIU_ADC_CLK] =
>>>> +		asiu_gate_val(0x0, 9),
>>>> +	[BCM_CYGNUS_ASIU_PWM_CLK] =
>>>> +		asiu_gate_val(IPROC_CLK_INVALID_OFFSET, 0),
>>>> +};
>>>
>>> Here I think a better binding would be to pass the gate value in the
>>> clock specifier, rather than an artificial index. That would let
>>> you get rid of the BCM_CYGNUS_ASIU_KEYPAD_CLK/BCM_CYGNUS_ASIU_ADC_CLK
>>> macros.
>>>
>> You meant to pass in both the gate register offset and its bit shift
>> through the clock specifier? But isn't the current ASIU clock code much
>> more consistent with the rest of the iProc clock code?
> 
> For simple devices that don't need an index macro, I would always
> prefer not defining them, because they are a pain to maintain.
> For a simple gate clock controller, we could compute both the offset
> and bit number from a single integer.
> 
> However, I now saw upon taking a closer look that the asiu has both
> a gate and a divider, and the latter one is not as simple, so
> my comment doesn't apply here.
> 
> 	Arnd
> 
Okay. I'll leave this as it is and make other changes based on the
review. Thanks!
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