linux-kernel - Re: [PATCH v3 3/5] arm64: dts: Add support for Spreadtrum SC9836 SoC in dts and Makefile

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Message-ID: <20141128142913.GB5393@localhost>
Date:	Fri, 28 Nov 2014 14:29:13 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	Mark Rutland <mark.rutland@....com>
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Subject: Re: [PATCH v3 3/5] arm64: dts: Add support for Spreadtrum SC9836 SoC
 in dts and Makefile

On Thu, Nov 27, 2014 at 01:43:09PM +0000, Mark Rutland wrote:
> On Thu, Nov 27, 2014 at 12:12:15PM +0000, Catalin Marinas wrote:
> > On Thu, Nov 27, 2014 at 11:50:43AM +0000, Mark Rutland wrote:
> > > On Tue, Nov 25, 2014 at 12:16:56PM +0000, Chunyan Zhang wrote:
> > > > +
> > > > +       timer {
> > > > +               compatible = "arm,armv8-timer";
> > > > +               interrupts = <1 13 0xff01>,
> > > > +                            <1 14 0xff01>,
> > > > +                            <1 11 0xff01>,
> > > > +                            <1 10 0xff01>;
> > > > +               clock-frequency = <26000000>;
> > > 
> > > Please remove the clock-frequency property. Your FW should initialise
> > > CNTFRQ_EL0 on all CPUs (certainly PSCI 0.2 requires that you do this).
> > 
> > Since this comes up regularly, I think we need a dev_warn() in the arch
> > timer driver when CONFIG_ARM64.
> 
> I'll ack such a patch ;)

How rude would this be?

diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
index 2133f9d59d06..aaaf3433ccb9 100644
--- a/drivers/clocksource/arm_arch_timer.c
+++ b/drivers/clocksource/arm_arch_timer.c
@@ -371,7 +371,8 @@ arch_timer_detect_rate(void __iomem *cntbase, struct device_node *np)
		return;
 
	/* Try to determine the frequency from the device tree or CNTFRQ */
-	if (of_property_read_u32(np, "clock-frequency", &arch_timer_rate)) {
+	if (IS_ENABLED(CONFIG_ARM64) ||
+	    of_property_read_u32(np, "clock-frequency", &arch_timer_rate)) {
		if (cntbase)
			arch_timer_rate = readl_relaxed(cntbase + CNTFRQ);
		else
--
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