linux-kernel - Re: [RFC PATCH 20/57] platform: Add a helper to find device by driver

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Date:   Tue, 4 Jun 2019 14:31:12 +0100
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     heiko@...ech.de
Cc:     linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org,
        rafael@...nel.org, inki.dae@...sung.com, sw0312.kim@...sung.com,
        hjc@...k-chips.com, eric@...olt.net
Subject: Re: [RFC PATCH 20/57] platform: Add a helper to find device by driver

Hi Heiko,

On 04/06/2019 14:29, Heiko Stuebner wrote:
> Hi,
> 
> Am Montag, 3. Juni 2019, 17:49:46 CEST schrieb Suzuki K Poulose:
>> There are a couple of places where we reuse platform specific
>> match to find a device. Instead of spilling the global varilable
>> everywhere, let us provide a helper to do the same.
>>
>> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>> Cc: "Rafael J. Wysocki" <rafael@...nel.org>
>> Cc: Inki Dae <inki.dae@...sung.com>
>> Cc: Seung-Woo Kim <sw0312.kim@...sung.com>
>> Cc: Sandy Huang <hjc@...k-chips.com>
>> Cc: "Heiko Stübner" <heiko@...ech.de>
>> Cc: Eric Anholt <eric@...olt.net>
>> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
> 
>> diff --git a/include/linux/platform_device.h b/include/linux/platform_device.h
>> index cc46485..a82b3ec 100644
>> --- a/include/linux/platform_device.h
>> +++ b/include/linux/platform_device.h
>> @@ -52,6 +52,9 @@ extern struct device platform_bus;
>>   extern void arch_setup_pdev_archdata(struct platform_device *);
>>   extern struct resource *platform_get_resource(struct platform_device *,
>>   					      unsigned int, unsigned int);
>> +extern struct device *
>> +platform_find_device_by_driver(struct device dev*,
>> +			       const struct device_driver *drv);
> 
> the "dev*" causes compilation errors and also doesn't match the
> function definition. With "dev*" -> "*start" it compiles again and
> my rockchip drm driver still manages to find its components, so
> after the above issue is fixed:
> 

Thanks for spotting, I have fixed this already locally.

> Tested-by: Heiko Stuebner <heiko@...ech.de>

Thanks a lot for the testing !

Suzuki