From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nikita Yushchenko Subject: Re: [V2, 2/6] tty: serial: lpuart: add little endian 32 bit register support Date: Wed, 17 May 2017 08:37:41 +0300 Message-ID: <8f4cf45e-45ab-e6e6-d95c-f3d4243697f4@cogentembedded.com> References: <1494834539-17523-3-git-send-email-aisheng.dong@nxp.com> <20170517033927.GC9913@b29396-OptiPlex-7040> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20170517033927.GC9913@b29396-OptiPlex-7040> Sender: linux-kernel-owner@vger.kernel.org To: Dong Aisheng Cc: Dong Aisheng , linux-serial@vger.kernel.org, fugang.duan@nxp.com, gregkh@linuxfoundation.org, yangbo.lu@nxp.com, linux-kernel@vger.kernel.org, stefan@agner.ch, Mingkai.Hu@nxp.com, jslaby@suse.com, linux-arm-kernel@lists.infradead.org List-Id: linux-serial@vger.kernel.org 17.05.2017 06:39, Dong Aisheng wrote: > 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? Isn't writel() in host endian?