linux-kernel - RE: [PATCH] drivers: clocksource: Use ttc driver as platform driver

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Date:   Tue, 26 Nov 2019 11:56:36 +0000
From:   Rajan Vaja <RAJANV@...inx.com>
To:     "daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>
CC:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] drivers: clocksource: Use ttc driver as platform driver

Please ignore this request.

Thanks,
Rajan

> -----Original Message-----
> From: Rajan Vaja
> Sent: 26 November 2019 05:06 PM
> To: Rajan Vaja <RAJANV@...inx.com>; ichal.simek@...inx.com;
> daniel.lezcano@...aro.org; tglx@...utronix.de
> Cc: linux-arm-kernel@...ts.infradead.org; linux-kernel@...r.kernel.org
> Subject: RE: [PATCH] drivers: clocksource: Use ttc driver as platform driver
> 
> Request for review.
> 
> Thanks,
> Rajan
> 
> > -----Original Message-----
> > From: Rajan Vaja <rajan.vaja@...inx.com>
> > Sent: 07 November 2019 04:01 PM
> > To: ichal.simek@...inx.com; daniel.lezcano@...aro.org; tglx@...utronix.de
> > Cc: linux-arm-kernel@...ts.infradead.org; linux-kernel@...r.kernel.org; Rajan
> Vaja
> > <RAJANV@...inx.com>
> > Subject: [PATCH] drivers: clocksource: Use ttc driver as platform driver
> >
> > Currently TTC driver is TIMER_OF_DECLARE type driver. Because of
> > that, TTC driver may be initialized before other clock drivers. If
> > TTC driver is dependent on that clock driver then initialization of
> > TTC driver will failed.
> >
> > So use TTC driver as platform driver instead of using
> > TIMER_OF_DECLARE.
> >
> > Signed-off-by: Rajan Vaja <rajan.vaja@...inx.com>
> > ---
> >  drivers/clocksource/timer-cadence-ttc.c | 26 ++++++++++++++++++--------
> >  1 file changed, 18 insertions(+), 8 deletions(-)
> >
> > diff --git a/drivers/clocksource/timer-cadence-ttc.c b/drivers/clocksource/timer-
> > cadence-ttc.c
> > index 88fe2e9..38858e1 100644
> > --- a/drivers/clocksource/timer-cadence-ttc.c
> > +++ b/drivers/clocksource/timer-cadence-ttc.c
> > @@ -15,6 +15,8 @@
> >  #include <linux/of_irq.h>
> >  #include <linux/slab.h>
> >  #include <linux/sched_clock.h>
> > +#include <linux/module.h>
> > +#include <linux/of_platform.h>
> >
> >  /*
> >   * This driver configures the 2 16/32-bit count-up timers as follows:
> > @@ -464,13 +466,7 @@ static int __init ttc_setup_clockevent(struct clk *clk,
> >  	return 0;
> >  }
> >
> > -/**
> > - * ttc_timer_init - Initialize the timer
> > - *
> > - * Initializes the timer hardware and register the clock source and clock event
> > - * timers with Linux kernal timer framework
> > - */
> > -static int __init ttc_timer_init(struct device_node *timer)
> > +static int __init ttc_timer_probe(struct platform_device *pdev)
> >  {
> >  	unsigned int irq;
> >  	void __iomem *timer_baseaddr;
> > @@ -478,6 +474,7 @@ static int __init ttc_timer_init(struct device_node *timer)
> >  	static int initialized;
> >  	int clksel, ret;
> >  	u32 timer_width = 16;
> > +	struct device_node *timer = pdev->dev.of_node;
> >
> >  	if (initialized)
> >  		return 0;
> > @@ -532,4 +529,17 @@ static int __init ttc_timer_init(struct device_node
> *timer)
> >  	return 0;
> >  }
> >
> > -TIMER_OF_DECLARE(ttc, "cdns,ttc", ttc_timer_init);
> > +static const struct of_device_id ttc_timer_of_match[] = {
> > +	{.compatible = "cdns,ttc"},
> > +	{},
> > +};
> > +
> > +MODULE_DEVICE_TABLE(of, ttc_timer_of_match);
> > +
> > +static struct platform_driver ttc_timer_driver = {
> > +	.driver = {
> > +		.name	= "cdns_ttc_timer",
> > +		.of_match_table = ttc_timer_of_match,
> > +	},
> > +};
> > +builtin_platform_driver_probe(ttc_timer_driver, ttc_timer_probe);
> > --
> > 2.7.4