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Date: Tue, 2 Jul 2019 11:07:40 +0200
From: Daniel Lezcano <daniel.lezcano@...aro.org>
To: Anson Huang <anson.huang@....com>,
"tglx@...utronix.de" <tglx@...utronix.de>,
"robh+dt@...nel.org" <robh+dt@...nel.org>,
"mark.rutland@....com" <mark.rutland@....com>,
"shawnguo@...nel.org" <shawnguo@...nel.org>,
"s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
"kernel@...gutronix.de" <kernel@...gutronix.de>,
"festevam@...il.com" <festevam@...il.com>,
Leonard Crestez <leonard.crestez@....com>,
"viresh.kumar@...aro.org" <viresh.kumar@...aro.org>,
Daniel Baluta <daniel.baluta@....com>,
Jacky Bai <ping.bai@....com>,
"l.stach@...gutronix.de" <l.stach@...gutronix.de>,
Abel Vesa <abel.vesa@....com>,
"andrew.smirnov@...il.com" <andrew.smirnov@...il.com>,
"ccaione@...libre.com" <ccaione@...libre.com>,
"angus@...ea.ca" <angus@...ea.ca>,
"agx@...xcpu.org" <agx@...xcpu.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>
Cc: dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH RESEND V4 1/5] clocksource: timer-of: Support getting
clock frequency from DT
On 02/07/2019 11:03, Anson Huang wrote:
> Hi, Daniel
>
>> Hi Anson,
>>
>> why did you resend the series?
>
> Previous patch series has build warning and I did NOT notice, sorry for that,
>
> drivers/clocksource/timer-of.c: In function ‘timer_of_init’:
> drivers/clocksource/timer-of.c:185:30: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses]
> if (to->flags & clock_flags == clock_flags)
> ^
>
> so I resend the patch series with below, sorry for missing mention of the changes in resent patch series.
>
> + if ((to->flags & clock_flags) == clock_flags)
>
> Sorry for mail storm...
No problem at all, I prefer this caught and fixed early :)
Next time just send a V5 because 'resend' means there is no change but
there was a problem with the email (could be also interpreted as a
gentle ping).
>> On 02/07/2019 09:55, Anson.Huang@....com wrote:
>>> From: Anson Huang <Anson.Huang@....com>
>>>
>>> More and more platforms use platform driver model for clock driver, so
>>> the clock driver is NOT ready during timer initialization phase, it
>>> will cause timer initialization failed.
>>>
>>> To support those platforms with upper scenario, introducing a new flag
>>> TIMER_OF_CLOCK_FREQUENCY which is mutually exclusive with
>>> TIMER_OF_CLOCK flag to support getting timer clock frequency from DT's
>>> timer node, the property name should be "clock-frequency", then of_clk
>>> operations can be skipped.
>>>
>>> User needs to select either TIMER_OF_CLOCK_FREQUENCY or
>> TIMER_OF_CLOCK
>>> flag if want to use timer-of driver to initialize the clock rate.
>>>
>>> Signed-off-by: Anson Huang <Anson.Huang@....com>
>>> ---
>>> Changes since V3:
>>> - use hardcoded "clock-frequency" instead of adding new variable
>> prop_name;
>>> - add pre-condition check for TIMER_OF_CLOCK and
>> TIMER_OF_CLOCK_FREQUENCY, they MUST be exclusive.
>>> ---
>>> drivers/clocksource/timer-of.c | 29 +++++++++++++++++++++++++++++
>>> drivers/clocksource/timer-of.h | 7 ++++---
>>> 2 files changed, 33 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/drivers/clocksource/timer-of.c
>>> b/drivers/clocksource/timer-of.c index 8054228..858f684 100644
>>> --- a/drivers/clocksource/timer-of.c
>>> +++ b/drivers/clocksource/timer-of.c
>>> @@ -161,11 +161,30 @@ static __init int timer_of_base_init(struct
>> device_node *np,
>>> return 0;
>>> }
>>>
>>> +static __init int timer_of_clk_frequency_init(struct device_node *np,
>>> + struct of_timer_clk *of_clk) {
>>> + int ret;
>>> + u32 rate;
>>> +
>>> + ret = of_property_read_u32(np, "clock-frequency", &rate);
>>> + if (!ret) {
>>> + of_clk->rate = rate;
>>> + of_clk->period = DIV_ROUND_UP(rate, HZ);
>>> + }
>>> +
>>> + return ret;
>>> +}
>>> +
>>> int __init timer_of_init(struct device_node *np, struct timer_of *to)
>>> {
>>> + unsigned long clock_flags = TIMER_OF_CLOCK |
>>> +TIMER_OF_CLOCK_FREQUENCY;
>>> int ret = -EINVAL;
>>> int flags = 0;
>>>
>>> + if ((to->flags & clock_flags) == clock_flags)
>>> + return ret;
>>> +
>>> if (to->flags & TIMER_OF_BASE) {
>>> ret = timer_of_base_init(np, &to->of_base);
>>> if (ret)
>>> @@ -180,6 +199,13 @@ int __init timer_of_init(struct device_node *np,
>> struct timer_of *to)
>>> flags |= TIMER_OF_CLOCK;
>>> }
>>>
>>> + if (to->flags & TIMER_OF_CLOCK_FREQUENCY) {
>>> + ret = timer_of_clk_frequency_init(np, &to->of_clk);
>>> + if (ret)
>>> + goto out_fail;
>>> + flags |= TIMER_OF_CLOCK_FREQUENCY;
>>> + }
>>> +
>>> if (to->flags & TIMER_OF_IRQ) {
>>> ret = timer_of_irq_init(np, &to->of_irq);
>>> if (ret)
>>> @@ -201,6 +227,9 @@ int __init timer_of_init(struct device_node *np,
>> struct timer_of *to)
>>> if (flags & TIMER_OF_CLOCK)
>>> timer_of_clk_exit(&to->of_clk);
>>>
>>> + if (flags & TIMER_OF_CLOCK_FREQUENCY)
>>> + to->of_clk.rate = 0;
>>> +
>>> if (flags & TIMER_OF_BASE)
>>> timer_of_base_exit(&to->of_base);
>>> return ret;
>>> diff --git a/drivers/clocksource/timer-of.h
>>> b/drivers/clocksource/timer-of.h index a5478f3..a08e108 100644
>>> --- a/drivers/clocksource/timer-of.h
>>> +++ b/drivers/clocksource/timer-of.h
>>> @@ -4,9 +4,10 @@
>>>
>>> #include <linux/clockchips.h>
>>>
>>> -#define TIMER_OF_BASE 0x1
>>> -#define TIMER_OF_CLOCK 0x2
>>> -#define TIMER_OF_IRQ 0x4
>>> +#define TIMER_OF_BASE 0x1
>>> +#define TIMER_OF_CLOCK 0x2
>>> +#define TIMER_OF_IRQ 0x4
>>> +#define TIMER_OF_CLOCK_FREQUENCY 0x8
>>>
>>> struct of_timer_irq {
>>> int irq;
--
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