[PATCH v3] arm/tegra: emc: convert tegra2_emc to a platform driver

[Olof Johansson]

On Thu, Jan 5, 2012 at 2:14 PM, Stephen Warren <swarren at nvidia.com> wrote:
> Olof Johansson wrote at Wednesday, January 04, 2012 11:01 PM:
>> This is the first step in making it device-tree aware and get rid of the
>> in-kernel EMC tables (of which there are none in mainline, thankfully).
>>
>> Changes since v2:
>>
>> * D'oh -- missed a couple of variables that were added, never used and then
>>   later removed in a later patch.
>>
>> Changes since v1:
>>
>> * Fixed messed up indentation
>> * Removed code that should be gone (was added here and removed later in series)
>>
>> Signed-off-by: Olof Johansson <olof at lixom.net>
> ...
>> diff --git a/arch/arm/mach-tegra/tegra2_emc.c b/arch/arm/mach-tegra/tegra2_emc.c
> ...
>> +static int __devinit tegra_emc_probe(struct platform_device *pdev)
> ...
>> +     if (!request_mem_region(res->start, resource_size(res), "tegra_emc")) {
>> +             dev_err(&pdev->dev, "failed to request register region\n");
>> +             return -EBUSY;
>> +     }
>> +
>> +     emc_regbase = ioremap(res->start, resource_size(res));
>
> Don't you need to error-check the ioremap() result, and undo the
> request_mem_region() too? Or, use the devm variant to request the
> region. The rest of the code checks emc_pdev!=NULL which won't detect
> this failure.
>
> Isn't there a get_resource && request && remap function now; I think I
> recall a patch that wraps all that into one function, but it might have
> been DT-only.

Nope, it's there -- devm_request_and_ioremap(). I'll move it over to
that and repost, it's a good idea.


-Olof