linux-kernel - Re: [PATCH 2/3] clocksource: add DB8500 PRCMU Timer support

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Date:	Tue, 31 May 2011 12:38:40 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Mattias Wallin <mattias.wallin@...ricsson.com>
cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Lee Jones <lee.jones@...aro.org>
Subject: Re: [PATCH 2/3] clocksource: add DB8500 PRCMU Timer support

On Tue, 31 May 2011, Mattias Wallin wrote:
> +static cycle_t clksrc_db8500_prcmu_read(struct clocksource *cs)
> +{
> +	u32 count, count2;
> +
> +	do {
> +		count = readl(PRCMU_TIMER_4_DOWNCOUNT);
> +		count2 = readl(PRCMU_TIMER_4_DOWNCOUNT);
> +	} while (count2 != count);

What's the point of this exercise ?

> +	clocksource_calc_mult_shift(&clocksource_db8500_prcmu,
> +		RATE_32K, SCHED_CLOCK_MIN_WRAP);
> +	clocksource_register(&clocksource_db8500_prcmu);

Please use clocksource_register_hz()

> diff --git a/include/linux/clksrc-db8500-prcmu.h b/include/linux/clksrc-db8500-prcmu.h
> new file mode 100644
> index 0000000..42b8587
> --- /dev/null
> +++ b/include/linux/clksrc-db8500-prcmu.h

Huch, why needs this to be a separate head in include/linux ?

> @@ -0,0 +1,17 @@
> +/*
> + * Copyright (C) ST-Ericsson SA 2011
> + *
> + * License Terms: GNU General Public License v2
> + * Author: Mattias Wallin <mattias.wallin@...ricsson.com>
> + *
> + */
> +#ifndef __CLKSRC_DB8500_PRCMU_H
> +#define __CLKSRC_DB8500_PRCMU_H
> +
> +#ifdef CONFIG_CLKSRC_DB8500_PRCMU
> +void __init clksrc_db8500_prcmu_init(void);
> +#else
> +void __init clksrc_db8500_prcmu_init(void) {}
> +#endif
> +
> +#endif
> -- 
> 1.7.4.3
> 
> 
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