linux-kernel - Re: [PATCH] gpio: pca953x: Use correct u16 value for register word write

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Date:	Wed, 30 Mar 2016 00:33:28 +0800
From:	Phil Reid <preid@...ctromag.com.au>
To:	Alexander Stein <alexander.stein@...tec-electronic.com>,
	linux-kernel@...r.kernel.org
Cc:	Yong Li <sdliyong@...il.com>, linux-gpio@...r.kernel.org
Subject: Re: [PATCH] gpio: pca953x: Use correct u16 value for register word
 write

On 29/03/2016 10:39 PM, Alexander Stein wrote:
> You missed CC'ing Phil (Added for this post)
>
> On Tuesday 29 March 2016 20:53:58, Yong Li wrote:
>> Thanks for your comment, I think I can change it to val[0] | (val[1]
>> << 8), is it okay ?
>
> Mh, currently there is only one caller (device_pca953x_init) which passes only
> 0, 0 or 0xff, 0xff, so endianess is irrelevant. But to be future proof this
> should be done in an endian-safe manner. Though cpu_to_le16p does not work,
> due to same alignment problem as casting to u16*.
>

I think get_unaligned((u16 *) val) should do the job.
There's also get_unaligned_le* get_unaligned_be*

-- 
Regards
Phil Reid