linux-kernel - Re: [PATCH 2/2] timer: imx-tpm: add imx tpm timer support

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Message-ID: <20170531063416.GA16812@b29396-OptiPlex-7040>
Date:   Wed, 31 May 2017 14:34:16 +0800
From:   Dong Aisheng <dongas86@...il.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Dong Aisheng <aisheng.dong@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Shawn Guo <shawnguo@...nel.org>, ping.bai@....com,
        anson.huang@....com, Sascha Hauer <kernel@...gutronix.de>
Subject: Re: [PATCH 2/2] timer: imx-tpm: add imx tpm timer support

Hi Arnd,

On Thu, May 25, 2017 at 11:02:22PM +0200, Arnd Bergmann wrote:
> On Sat, May 13, 2017 at 9:29 AM, Dong Aisheng <aisheng.dong@....com> wrote:
> 
> > diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
> > index 3356ab8..03dfd6a 100644
> > --- a/drivers/clocksource/Kconfig
> > +++ b/drivers/clocksource/Kconfig
> > @@ -590,6 +590,11 @@ config CLKSRC_IMX_GPT
> >         depends on ARM && CLKDEV_LOOKUP
> >         select CLKSRC_MMIO
> >
> > +config CLKSRC_IMX_TPM
> > +       bool "Clocksource using i.MX TPM" if COMPILE_TEST
> > +       depends on ARM && CLKDEV_LOOKUP && GENERIC_CLOCKEVENTS
> > +       select CLKSRC_MMIO
> > +
> 
> This needs a help text
> 

Got it

> 
> > +static inline void tpm_timer_disable(void)
> > +{
> > +       unsigned int val;
> > +
> > +       /* channel disable */
> > +       val = __raw_readl(timer_base + TPM_C0SC);
> > +       val &= ~(TPM_C0SC_MODE_MASK | TPM_C0SC_CHIE);
> > +       __raw_writel(val, timer_base + TPM_C0SC);
> > +}
> 
> __raw_readl/__raw_writel is broken on big-endian kernels, please
> use readl/writel instead.
> 

That's true.

Thanks for the kind reminder.

Regards
Dong Aisheng

>         Arnd