linux-kernel - Re: [PATCH v5 2/3] clocksource: update "fn" at CLOCKSOURCE_OF

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Date:   Mon, 14 Nov 2016 09:43:10 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Noam Camus <noamca@...lanox.com>
Cc:     robh+dt@...nel.org, mark.rutland@....com, tglx@...utronix.de,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/3] clocksource: update "fn" at
 CLOCKSOURCE_OF_DECLARE() of nps400 timer

On Sun, Nov 13, 2016 at 09:24:31AM +0200, Noam Camus wrote:
> From: Noam Camus <noamca@...lanox.com>
> 
> nps_setup_clocksource() should take node as only argument i.e.:
> replace
> int __init nps_setup_clocksource(struct device_node *node, struct clk *clk)
> with
> int __init nps_setup_clocksource(struct device_node *node)

because ...

> This is also serve as preperation for next patch which adds support

s/This is also/This also/
s/preperation/preparation/


> for clockevents to nps400.
> Specifically we add new function nps_get_timer_clk() to serve clocksource
> and later clockevent registration.
> 
> Signed-off-by: Noam Camus <noamca@...lanox.com>
> ---
>  drivers/clocksource/timer-nps.c |   63 +++++++++++++++++++++++----------------
>  1 files changed, 37 insertions(+), 26 deletions(-)
> 
> diff --git a/drivers/clocksource/timer-nps.c b/drivers/clocksource/timer-nps.c
> index 70c149a..eeef9e9 100644
> --- a/drivers/clocksource/timer-nps.c
> +++ b/drivers/clocksource/timer-nps.c
> @@ -46,7 +46,33 @@
>  /* This array is per cluster of CPUs (Each NPS400 cluster got 256 CPUs) */
>  static void *nps_msu_reg_low_addr[NPS_CLUSTER_NUM] __read_mostly;
>  
> -static unsigned long nps_timer_rate;
> +static int __init nps_get_timer_clk(struct device_node *node,
> +			     unsigned long *timer_freq,
> +			     struct clk **clk)
> +{
> +	int ret;
> +
> +	*clk = of_clk_get(node, 0);
> +	if (IS_ERR(*clk)) {
> +		pr_err("timer missing clk");
> +		return PTR_ERR(*clk);
> +	}
> +
> +	ret = clk_prepare_enable(*clk);
> +	if (ret) {
> +		pr_err("Couldn't enable parent clk\n");
> +		return ret;
> +	}
> +
> +	*timer_freq = clk_get_rate(*clk);
> +	if (!(*timer_freq)) {
> +		pr_err("Couldn't get clk rate\n");
> +		clk_disable_unprepare(*clk);
> +		return 1;

s/return 1/return -EINVAL/

What about clk_put() ?

> +	}
> +
> +	return 0;
> +}
>  
>  static cycle_t nps_clksrc_read(struct clocksource *clksrc)
>  {
> @@ -55,26 +81,24 @@ static cycle_t nps_clksrc_read(struct clocksource *clksrc)
>  	return (cycle_t)ioread32be(nps_msu_reg_low_addr[cluster]);
>  }
>  
> -static int __init nps_setup_clocksource(struct device_node *node,
> -					struct clk *clk)
> +static int __init nps_setup_clocksource(struct device_node *node)
>  {
>  	int ret, cluster;
> +	struct clk *clk;
> +	unsigned long nps_timer1_freq;
> +
>  
>  	for (cluster = 0; cluster < NPS_CLUSTER_NUM; cluster++)
>  		nps_msu_reg_low_addr[cluster] =
>  			nps_host_reg((cluster << NPS_CLUSTER_OFFSET),
> -				 NPS_MSU_BLKID, NPS_MSU_TICK_LOW);
> +				     NPS_MSU_BLKID, NPS_MSU_TICK_LOW);
>  
> -	ret = clk_prepare_enable(clk);
> -	if (ret) {
> -		pr_err("Couldn't enable parent clock\n");
> +	ret = nps_get_timer_clk(node, &nps_timer1_freq, &clk);
> +	if (ret)
>  		return ret;
> -	}
>  
> -	nps_timer_rate = clk_get_rate(clk);
> -
> -	ret = clocksource_mmio_init(nps_msu_reg_low_addr, "EZnps-tick",
> -				    nps_timer_rate, 301, 32, nps_clksrc_read);
> +	ret = clocksource_mmio_init(nps_msu_reg_low_addr, "nps-tick",
> +				    nps_timer1_freq, 300, 32, nps_clksrc_read);
>  	if (ret) {
>  		pr_err("Couldn't register clock source.\n");
>  		clk_disable_unprepare(clk);
> @@ -83,18 +107,5 @@ static int __init nps_setup_clocksource(struct device_node *node,
>  	return ret;
>  }
>  
> -static int __init nps_timer_init(struct device_node *node)
> -{
> -	struct clk *clk;
> -
> -	clk = of_clk_get(node, 0);
> -	if (IS_ERR(clk)) {
> -		pr_err("Can't get timer clock.\n");
> -		return PTR_ERR(clk);
> -	}
> -
> -	return nps_setup_clocksource(node, clk);
> -}
> -
>  CLOCKSOURCE_OF_DECLARE(ezchip_nps400_clksrc, "ezchip,nps400-timer",
> -		       nps_timer_init);
> +		       nps_setup_clocksource);
> -- 
> 1.7.1
> 

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