linux-kernel - Re: [PATCHv5 0/8] 2c: Relax mandatory I2C ID table passing

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Message-ID: <20160609191513.GB23522@katana>
Date:	Thu, 9 Jun 2016 21:15:13 +0200
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Kieran Bingham <kieran@...uared.org.uk>
Cc:	Lee Jones <lee.jones@...aro.org>, javier@....samsung.com,
	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
	grant.likely@...aro.org, sameo@...ux.intel.com
Subject: Re: [PATCHv5 0/8] 2c: Relax mandatory I2C ID table passing

Hi Kieran,

> * Device Tree
>   I tested that the device would still register by adding a node in the device
>   tree for the board, and testing with a built-in module. 
> 
>  - This worked fine.
> 
> * Module Autoloading
>   With the device tree node in the board dts file, it wouldn't automatically
>   load from the external module. This was due to the rtc-ds1307 module not
>   exporting an of_match table, and not yet having Javier's "report OF style
>   modalias when probing using DT" [0]  patch applied

What I didn't get here: did your version of the RTC driver use probe()
or probe_new() without i2c_device_id table or did you try both? I assume
module autoloading only fails with probe_new(), otherwise we would be in
serious trouble. But I'd wonder then that userspace instantiation works.

Thanks to you and Javier for the testing. I pushed the patches to a
local branch for now and will merge once this question is clear.

Regards,

   Wolfram


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