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

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Message-ID: <20170517033927.GC9913@b29396-OptiPlex-7040>
Date:   Wed, 17 May 2017 11:39:27 +0800
From:   Dong Aisheng <dongas86@...il.com>
To:     Nikita Yushchenko <nikita.yoush@...entembedded.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

On Tue, May 16, 2017 at 02:15:08PM +0300, Nikita Yushchenko wrote:
> >  static u32 lpuart32_read(void __iomem *addr)
> >  {
> > -	return ioread32be(addr);
> > +	return lpuart_is_be ? ioread32be(addr) : readl(addr);
> >  }
> >  
> >  static void lpuart32_write(u32 val, void __iomem *addr)
> >  {
> > -	iowrite32be(val, addr);
> > +	if (lpuart_is_be)
> > +		iowrite32be(val, addr);
> > +	else
> > +		writel(val, addr);
> >  }
> 
> What if this is ever executed on big endian system?
> 

Sorry, not catching the point...

What issues will meet?

Regards
Dong Aisheng