linux-kernel - Re: [V2, 2/6] tty: serial: lpuart: add little endian 32 bit register support

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Date:   Wed, 17 May 2017 08:43:34 +0300
From:   Nikita Yushchenko <nikita.yoush@...entembedded.com>
To:     Dong Aisheng <dongas86@...il.com>
Cc:     Dong Aisheng <aisheng.dong@....com>, linux-serial@...r.kernel.org,
        fugang.duan@....com, gregkh@...uxfoundation.org, yangbo.lu@....com,
        linux-kernel@...r.kernel.org, stefan@...er.ch, Mingkai.Hu@....com,
        jslaby@...e.com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [V2, 2/6] tty: serial: lpuart: add little endian 32 bit register
 support

>>> @@ -2000,6 +2007,7 @@ static int lpuart_probe(struct platform_device *pdev)
>>>  	}
>>>  	sport->port.line = ret;
>>>  	sport->lpuart32 = sdata->is_32;
>>> +	lpuart_is_be = sdata->is_be;
>>
>> Setting a global variable in per-device routine is quite bad design.
>>
> 
> There is a reason for that we don't want to change the exist 
> lpuart32_read[write] API which is widely used in driver.
> Making a global lpuart_is_be is the simplest way to do it.
> 
> Any strong blocking reason?

Code should be consistent.

There is no good reason to have sport->lpuart32 inside sport, but
lpuart_is_be outside of it. Both these values describe properties of
particular device, and thus should be in per-device structure.

If that implies adding sport arg to lpuart32_(read|write), just do that.