linux-kernel - Re: [PATCH v5 1/3] clocksource: timer-keystone: introduce clocksource driver for Keystone

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Date:	Wed, 5 Feb 2014 18:35:26 -0600
From:	Josh Cartwright <joshc@...eaurora.org>
To:	Ivan Khoronzhuk <ivan.khoronzhuk@...com>
Cc:	santosh.shilimkar@...com, rob@...dley.net, linux@....linux.org.uk,
	galak@...eaurora.org, mark.rutland@....com,
	devicetree@...r.kernel.org, grygorii.strashko@...com,
	pawel.moll@....com, ijc+devicetree@...lion.org.uk,
	daniel.lezcano@...aro.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, robh+dt@...nel.org,
	tglx@...utronix.de, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v5 1/3] clocksource: timer-keystone: introduce
 clocksource driver for Keystone

Hey Ivan-

On Wed, Feb 05, 2014 at 03:47:38PM +0200, Ivan Khoronzhuk wrote:
> Add broadcast clock-event device for the Keystone arch.
> 
> The timer can be configured as a general-purpose 64-bit timer,
> dual general-purpose 32-bit timers. When configured as dual 32-bit
> timers, each half can operate in conjunction (chain mode) or
> independently (unchained mode) of each other.
> 
> Reviewed-by: Stephen Boyd <sboyd@...eaurora.org>
> Acked-by: Santosh shilimkar <santosh.shilimkar@...com>
> Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@...com>
> ---
>  drivers/clocksource/Makefile         |   1 +
>  drivers/clocksource/timer-keystone.c | 233 +++++++++++++++++++++++++++++++++++
>  2 files changed, 234 insertions(+)
>  create mode 100644 drivers/clocksource/timer-keystone.c
> 
> diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
> index c7ca50a..4abe5aa 100644
> --- a/drivers/clocksource/Makefile
> +++ b/drivers/clocksource/Makefile
> @@ -37,3 +37,4 @@ obj-$(CONFIG_ARM_ARCH_TIMER)		+= arm_arch_timer.o
>  obj-$(CONFIG_ARM_GLOBAL_TIMER)		+= arm_global_timer.o
>  obj-$(CONFIG_CLKSRC_METAG_GENERIC)	+= metag_generic.o
>  obj-$(CONFIG_ARCH_HAS_TICK_BROADCAST)	+= dummy_timer.o
> +obj-$(CONFIG_ARCH_KEYSTONE)		+= timer-keystone.o
> diff --git a/drivers/clocksource/timer-keystone.c b/drivers/clocksource/timer-keystone.c
> new file mode 100644
> index 0000000..2299666
> --- /dev/null
> +++ b/drivers/clocksource/timer-keystone.c
> +static void __init keystone_timer_init(struct device_node *np)
> +{
> +	struct clock_event_device *event_dev = &timer.event_dev;
> +	unsigned long rate;
> +	struct clk *clk;
> +	int irq, error;
> +	u32 tgcr;
> +
> +	irq  = irq_of_parse_and_map(np, 0);
> +	if (irq == NO_IRQ) {
> +		pr_err("%s: failed to map interrupts\n", __func__);
> +		return;
> +	}
> +
> +	timer.base = of_iomap(np, 0);
> +	if (!timer.base) {
> +		pr_err("%s: failed to map registers\n", __func__);
> +		return;
> +	}
> +
> +	clk = of_clk_get(np, 0);
> +	if (!clk) {

This condition should be IS_ERR(clk).

> +		pr_err("%s: failed to get clock\n", __func__);
> +		iounmap(timer.base);
> +		return;
> +	}

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