linux-kernel - Re: [PATCH] clk: tegra: provide dummy cpu car ops

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Date:	Wed, 06 Mar 2013 16:42:53 -0700
From:	Stephen Warren <swarren@...dotorg.org>
To:	Andrew Chew <AChew@...dia.com>
CC:	Peter De Schrijver <pdeschrijver@...dia.com>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Stephen Warren <swarren@...dia.com>,
	Prashant Gaikwad <pgaikwad@...dia.com>,
	Mike Turquette <mturquette@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] clk: tegra: provide dummy cpu car ops

On 03/06/2013 04:20 PM, Andrew Chew wrote:
>> Subject: [PATCH] clk: tegra: provide dummy cpu car ops
>>
>> tegra_boot_secondary() relies on some of the car ops. This means having an
>> uninitialized tegra_cpu_car_ops will lead to an early boot panic.
>> Providing a dummy struct avoids this and makes adding Tegra114 clock
>> support in a bisectable way a lot easier.
>>
>> --
>>
>> Stephen,
>>
>> Should this be a separate patch or should I make this part of new release of
>> the Tegra114 clock series?

I'm not sure if I answered this. Peter, I intend to apply this patch to
a branch right before the CCF, so there's no explicit need to include it
in the series, although if you do, that's fine.

>> diff --git a/drivers/clk/tegra/clk.c b/drivers/clk/tegra/clk.c index

>>  /* Global data of Tegra CPU CAR ops */
>> -struct tegra_cpu_car_ops *tegra_cpu_car_ops;
> 
> Sorry for bringing this up so late...
> Shouldn't the above be "struct tegra_cpu_car_ops tegra_cpu_car_ops;"?
> 
>> +static struct tegra_cpu_car_ops *dummy_car_ops; struct
>> +tegra_cpu_car_ops *tegra_cpu_car_ops = &dummy_car_ops;

No, the value is used as a pointer in include/linux/clk/tegra.h, e.g.:

tegra_cpu_car_ops->wait_for_reset(cpu);

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