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

From: Rajan Vaja
Date: Tue Nov 26 2019 - 06:54:37 EST


Request for review.

Thanks,
Rajan

> -----Original Message-----
> From: Rajan Vaja <rajan.vaja@xxxxxxxxxx>
> Sent: 07 November 2019 04:06 PM
> To: Michal Simek <michals@xxxxxxxxxx>; daniel.lezcano@xxxxxxxxxx;
> tglx@xxxxxxxxxxxxx
> Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; Jolly Shah <JOLLYS@xxxxxxxxxx>; linux-
> kernel@xxxxxxxxxxxxxxx; Rajan Vaja <RAJANV@xxxxxxxxxx>
> 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@xxxxxxxxxx>
> ---
> 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