linux-kernel - Re: [PATCH] clk: tegra: export clock names for debugging

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Message-ID: <53AD94FD.2070400@wwwdotorg.org>
Date:	Fri, 27 Jun 2014 09:59:57 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Peter De Schrijver <pdeschrijver@...dia.com>
CC:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	Prashant Gaikwad <pgaikwad@...dia.com>,
	Mike Turquette <mturquette@...aro.org>,
	Thierry Reding <thierry.reding@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] clk: tegra: export clock names for debugging

On 06/27/2014 06:19 AM, Peter De Schrijver wrote:
> On Thu, Jun 26, 2014 at 05:52:16PM +0200, Stephen Warren wrote:
>> On 06/26/2014 09:48 AM, Peter De Schrijver wrote:
>>> When writing a module for testing or debugging purposes, there is no way to
>>> get hold of clk handles. This patch solves this by exposing all valid clocks
>>> as clkdev's for the virtual device tegra-clk-debug.
>>
>> This is to support clk_get_sys()?
>>
> 
> Yes.
> 
>> I guess this seems fine, so feel free to apply it, but I slightly wonder
>> why not just include this change as part of the presumably local and
>> never-to-be-upstreamed test/dev module?
> 
> The idea is to allow local debug modules to get hold of the struct clk *. I
> don't think that's possible without using clk_get_sys()?

Well, for a debug hack you can always just add extra clock entries into
some DT node and so avoid clk_get_sys:-)

My point wasn't so much about not using clk_get_sys in a debug driver,
but more that if this patch is only required to support non-upstreamed
debug code, perhaps this patch should stay downstream along with that
non-upstreamed debug code. That said, I'm not really objecting to it,
just making a minor comment.
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