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SubjectRe: [PATCH 02/17] clocksource: davinci-timer: new driver
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Hi Bartosz,

On 11/01/19 10:51 PM, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
>
> Currently the clocksource and clockevent support for davinci platforms
> lives in mach-davinci. It hard-codes many things, used global variables,
> implements functionalities unused by any platform and has code fragments
> scattered across many (often unrelated) files.
>
> Implement a new, modern and simplified timer driver and put it into
> drivers/clocksource. We still need to support legacy board files so
> export a config structure and a function that allows machine code to
> register the timer.
>
> We don't check the return values of regmap reads and writes since with
> mmio it's only likely to fail due to programmer's errors.
>
> We also don't bother freeing resources on errors in
> davinci_timer_register() as the system won't boot without a timer anyway.
>
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

With this series, DA830 fails to boot. Rest of the devices are okay from
boot perspective.

DA830 is pretty unique because it uses the same timer-half for both
clocksource and clockevent. May be you can set the same configuration on
your DA850 to see the same issue? Else, I will enable low-level debug
and try to provide more debug data.

Some minor comments below from quick look:

> diff --git a/drivers/clocksource/timer-davinci.c b/drivers/clocksource/timer-davinci.c
> new file mode 100644
> index 000000000000..7282a1fda80f
> --- /dev/null
> +++ b/drivers/clocksource/timer-davinci.c
> @@ -0,0 +1,415 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * TI DaVinci clocksource driver
> + *
> + * Copyright (C) 2019 Texas Instruments
> + * Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> + * (with some parts adopted from code by Kevin Hilman <khilman@baylibre.com>)

Did you really intend GPL v2 or later? The original code referred to
above is marked 2.0 only.

> + */
> +
> +#include <linux/clk.h>
> +#include <linux/clockchips.h>
> +#include <linux/clocksource.h>
> +#include <linux/err.h>
> +#include <linux/interrupt.h>
> +#include <linux/kernel.h>
> +#include <linux/of_address.h>
> +#include <linux/of_irq.h>
> +#include <linux/regmap.h>
> +#include <linux/sched_clock.h>
> +
> +#include <clocksource/timer-davinci.h>
> +
> +#define DAVINCI_TIMER_REG_TIM12 0x10
> +#define DAVINCI_TIMER_REG_TIM34 0x14
> +#define DAVINCI_TIMER_REG_PRD12 0x18
> +#define DAVINCI_TIMER_REG_PRD34 0x1c
> +#define DAVINCI_TIMER_REG_TCR 0x20
> +#define DAVINCI_TIMER_REG_TGCR 0x24
> +
> +#define DAVINCI_TIMER_TIMMODE_MASK 0x0000000c
> +#define DAVINCI_TIMER_RESET_MASK 0x00000003
> +#define DAVINCI_TIMER_TIMMODE_32BIT_UNCHAINED 0x00000004
> +#define DAVINCI_TIMER_UNRESET 0x00000003

I think these are more readable if using BIT() and GENMASK()

Thanks,
Sekhar

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