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clocksource/drivers/renesas-ostm: Add RZ/G2L OSTM support

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RZ/G2L SoC has Generic Timer Module(a.k.a OSTM) which needs to
deassert the reset line before accessing any registers.

This patch adds an entry point for RZ/G2L so that we can deassert
the reset line in probe callback.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20211112184413.4391-4-biju.das.jz@bp.renesas.com
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
This commit is contained in:
Biju Das 2021-11-12 18:44:12 +00:00 committed by Daniel Lezcano
parent 92d06a3f67
commit 3a3e9f23c2
1 changed files with 38 additions and 1 deletions
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39
drivers/clocksource/renesas-ostm.c
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@ -9,6 +9,8 @@
#include <linux/clk.h>
#include <linux/clockchips.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/reset.h>
#include <linux/sched_clock.h>
#include <linux/slab.h>
@ -159,6 +161,7 @@ static int __init ostm_init_clkevt(struct timer_of *to)
static int __init ostm_init(struct device_node *np)
{
struct reset_control *rstc;
struct timer_of *to;
int ret;
@ -166,6 +169,14 @@ static int __init ostm_init(struct device_node *np)
if (!to)
return -ENOMEM;
rstc = of_reset_control_get_optional_exclusive(np, NULL);
if (IS_ERR(rstc)) {
ret = PTR_ERR(rstc);
goto err_free;
}
reset_control_deassert(rstc);
to->flags = TIMER_OF_BASE | TIMER_OF_CLOCK;
if (system_clock) {
/*
@ -178,7 +189,7 @@ static int __init ostm_init(struct device_node *np)
ret = timer_of_init(np, to);
if (ret)
goto err_free;
goto err_reset;
/*
* First probed device will be used as system clocksource. Any
@ -203,9 +214,35 @@ static int __init ostm_init(struct device_node *np)
err_cleanup:
timer_of_cleanup(to);
err_reset:
reset_control_assert(rstc);
reset_control_put(rstc);
err_free:
kfree(to);
return ret;
}
TIMER_OF_DECLARE(ostm, "renesas,ostm", ostm_init);
#ifdef CONFIG_ARCH_R9A07G044
static int __init ostm_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
return ostm_init(dev->of_node);
}
static const struct of_device_id ostm_of_table[] = {
{ .compatible = "renesas,ostm", },
{ /* sentinel */ }
};
static struct platform_driver ostm_device_driver = {
.driver = {
.name = "renesas_ostm",
.of_match_table = of_match_ptr(ostm_of_table),
.suppress_bind_attrs = true,
},
};
builtin_platform_driver_probe(ostm_device_driver, ostm_probe);
#endif