From: dongas86@gmail.com (Dong Aisheng)
To: linux-arm-kernel@lists.infradead.org
Subject: [V2, 2/6] tty: serial: lpuart: add little endian 32 bit register support
Date: Wed, 17 May 2017 13:43:57 +0800 [thread overview]
Message-ID: <20170517054356.GE9913@b29396-OptiPlex-7040> (raw)
In-Reply-To: <8f4cf45e-45ab-e6e6-d95c-f3d4243697f4@cogentembedded.com>
On Wed, May 17, 2017 at 08:37:41AM +0300, Nikita Yushchenko wrote:
>
>
> 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?
On big endian systems, it is supposed to run iowrite32be.
Regards
Dong Aisheng
next prev parent reply other threads:[~2017-05-17 5:43 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-15 7:48 [PATCH V2 0/6] tty: serial: lpuart: add imx7ulp support Dong Aisheng
2017-05-15 7:48 ` [PATCH V2 1/6] tty: serial: lpuart: introduce lpuart_soc_data to represent SoC property Dong Aisheng
2017-05-15 13:35 ` Andy Shevchenko
2017-05-15 7:48 ` [PATCH V2 2/6] tty: serial: lpuart: add little endian 32 bit register support Dong Aisheng
2017-05-15 13:36 ` Andy Shevchenko
2017-05-17 3:26 ` Dong Aisheng
2017-05-16 11:08 ` [V2, " Nikita Yushchenko
2017-05-17 3:31 ` Dong Aisheng
2017-05-17 5:43 ` Nikita Yushchenko
2017-05-17 6:01 ` A.S. Dong
2017-05-17 6:25 ` Nikita Yushchenko
2017-05-17 7:00 ` Dong Aisheng
2017-05-17 8:04 ` Nikita Yushchenko
2017-05-19 15:07 ` Dong Aisheng
2017-05-23 5:24 ` Nikita Yushchenko
2017-05-31 8:07 ` Dong Aisheng
2017-05-16 11:15 ` Nikita Yushchenko
2017-05-17 3:39 ` Dong Aisheng
2017-05-17 5:37 ` Nikita Yushchenko
2017-05-17 5:43 ` Dong Aisheng [this message]
2017-05-17 5:50 ` Nikita Yushchenko
2017-05-17 6:09 ` Dong Aisheng
2017-05-17 9:55 ` Andy Shevchenko
2017-05-31 7:47 ` Dong Aisheng
2017-05-17 9:53 ` Andy Shevchenko
2017-05-15 7:48 ` [PATCH V2 3/6] dt-bindings: serial: fsl-lpuart: add i.MX7ULP support Dong Aisheng
2017-05-15 7:48 ` [PATCH V2 4/6] tty: serial: lpuart: add imx7ulp support Dong Aisheng
2017-05-15 7:48 ` [PATCH V2 5/6] tty: serial: lpuart: add earlycon support for imx7ulp Dong Aisheng
2017-05-15 7:48 ` [PATCH V2 6/6] tty: serial: lpuart: add a more accurate baud rate calculation method Dong Aisheng
2017-05-15 17:06 ` Stefan Agner
2017-05-17 3:47 ` Dong Aisheng
2017-05-17 17:35 ` Stefan Agner
2017-05-19 11:50 ` Dong Aisheng
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