Re: [PATCH v3 01/11] clocksource: davinci-timer: new driver

[David Lechner]

On 2/26/19 6:06 AM, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>
>
> Currently the clocksource and clockevent support for davinci platforms
> lives in mach-davinci. It hard-codes many things, uses 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 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@xxxxxxxxxxxx>
> ---

Reviewed-by: David Lechner <david@xxxxxxxxxxxxxx>

with a few minor formatting issues


...

> diff --git a/drivers/clocksource/timer-davinci.c b/drivers/clocksource/timer-davinci.c
> new file mode 100644
> index 000000000000..ba2b21c94c2f
> --- /dev/null
> +++ b/drivers/clocksource/timer-davinci.c

...

> +/**
> + * struct davinci_timer_regs - timer-specific register offsets
> + *
> + * tim_off - timer counter register
> + * prd_off - timer period register
> + * enamode_shift - left bit-shift of the enable register associated
> + *                 with this timer in the TCR register

fields should be:

	@field: description

...

> diff --git a/drivers/clocksource/timer-davinci.c b/drivers/clocksource/timer-davinci.c
> new file mode 100644
> index 000000000000..ba2b21c94c2f
> --- /dev/null
> +++ b/drivers/clocksource/timer-davinci.c
> @@ -0,0 +1,438 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +//
> +// TI DaVinci clocksource driver
> +//
> +// Copyright (C) 2019 Texas Instruments
> +// Author: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>
> +// (with some parts adopted from code by Kevin Hilman <khilman@xxxxxxxxxxxx>)
> +
> +#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/sched_clock.h>
> +
> +#include <clocksource/timer-davinci.h>
> +
> +#undef pr_fmt
> +#define pr_fmt(fmt) "%s: " fmt "\n", __func__

...


> +	rv = clk_prepare_enable(clk);
> +	if (rv) {
> +		pr_err("Unable to prepare and enable the timer clock\n");

Won't this cause double newline in error message since pr_fmt also
includes "\n"?

Same with additional pr_err messages elsewhere in this patch.