Commit 3a3e9f23 authored by Biju Das's avatar Biju Das Committed by Daniel Lezcano
Browse files

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



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: default avatarBiju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: default avatarLad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20211112184413.4391-4-biju.das.jz@bp.renesas.com


Signed-off-by: default avatarDaniel Lezcano <daniel.lezcano@linaro.org>
parent 92d06a3f

drivers/clocksource/renesas-ostm.c

+38 −1
Original line number Diff line number Diff line
@@ -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