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Re: [PATCH v2 2/3] clocksource: update "fn" at CLOCKSOURCE_OF_DECLARE() of nps400 timer

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  Re: [PATCH v2 2/3] clocksource: update "fn" at  CLOCKSOURCE_OF_DECLARE() of nps400 timer Daniel Lezcano <daniel.lezcano@linaro.org> - 2016-10-31 11:30 +0100
    RE: [PATCH v2 2/3] clocksource: update "fn" at  CLOCKSOURCE_OF_DECLARE() of nps400 timer Noam Camus <noamca@mellanox.com> - 2016-10-31 18:00 +0100

#1512460 — Re: [PATCH v2 2/3] clocksource: update "fn" at CLOCKSOURCE_OF_DECLARE() of nps400 timer

On Sun, Oct 23, 2016 at 03:12:27PM +0300, Noam Camus wrote:
> From: Noam Camus <noamca@mellanox.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)
> 
> This is also serve as preperation for next patch which adds support

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@mellanox.com>
> ---
>  drivers/clocksource/timer-nps.c |   49 ++++++++++++++++++++------------------
>  1 files changed, 26 insertions(+), 23 deletions(-)
> 
> diff --git a/drivers/clocksource/timer-nps.c b/drivers/clocksource/timer-nps.c
> index 70c149a..6156e54 100644
> --- a/drivers/clocksource/timer-nps.c
> +++ b/drivers/clocksource/timer-nps.c
> @@ -47,6 +47,28 @@
>  static void *nps_msu_reg_low_addr[NPS_CLUSTER_NUM] __read_mostly;
>  
>  static unsigned long nps_timer_rate;
> +static int nps_get_timer_clk(struct device_node *node,
> +			     unsigned long *timer_freq,
> +			     struct clk *clk)

This function prototype does not make sense. A pointer to a clock is passed
for nothing here.

> +{
> +	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);
> +

	timer_freq check.

	rollback on error.

> +	return 0;
> +}
>  
>  static cycle_t nps_clksrc_read(struct clocksource *clksrc)
>  {
> @@ -55,23 +77,17 @@ 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;
>  
>  	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);
>  
> -	ret = clk_prepare_enable(clk);
> -	if (ret) {
> -		pr_err("Couldn't enable parent clock\n");
> -		return ret;
> -	}
> -
> -	nps_timer_rate = clk_get_rate(clk);
> +	nps_get_timer_clk(node, &nps_timer_rate, clk);

Return code check ?
  
>  	ret = clocksource_mmio_init(nps_msu_reg_low_addr, "EZnps-tick",
>  				    nps_timer_rate, 301, 32, nps_clksrc_read);
> @@ -83,18 +99,5 @@ 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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#1512711

> From: Daniel Lezcano [mailto:daniel.lezcano@linaro.org] 
> Sent: Monday, October 31, 2016 12:28 PM

>> From: Noam Camus <noamca@mellanox.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)
>> 
>> This is also serve as preperation for next patch which adds support
>
>s/preperation/preparation/
Thanks, will fix in V4 of this patch set
...

>> +static int nps_get_timer_clk(struct device_node *node,
>> +			     unsigned long *timer_freq,
>> +			     struct clk *clk)
>
>This function prototype does not make sense. A pointer to a clock is passed for nothing here.
Thanks, I passed *clk in order for one to do rollback on error (pass clk to clk_disable_unprepare).
I will change prototype to **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);
>> +
>
>	timer_freq check.
>
>	rollback on error.
Thanks, will fix at V4

...
>> -	if (ret) {
>> -		pr_err("Couldn't enable parent clock\n");
>> -		return ret;
>> -	}
>> -
>> -	nps_timer_rate = clk_get_rate(clk);
>> +	nps_get_timer_clk(node, &nps_timer_rate, clk);

>Return code check ?
Thanks, will fix at V4
  
-Noam

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