[PATCH 5.10.y-cip 15/29] clocksource/drivers/renesas-ostm: Add RZ/G2L OSTM support


Lad Prabhakar
 

From: Biju Das <biju.das.jz@...>

commit 3a3e9f23c2cae907677a236fa547610ca747e6fb upstream.

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@...>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...>
Reviewed-by: Geert Uytterhoeven <geert+renesas@...>
Link: https://lore.kernel.org/r/20211112184413.4391-4-biju.das.jz@bp.renesas.com
Signed-off-by: Daniel Lezcano <daniel.lezcano@...>
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...>
---
drivers/clocksource/renesas-ostm.c | 39 +++++++++++++++++++++++++++++-
1 file changed, 38 insertions(+), 1 deletion(-)

diff --git a/drivers/clocksource/renesas-ostm.c b/drivers/clocksource/renesas-ostm.c
index 3d06ba66008c..21d1392637b8 100644
--- a/drivers/clocksource/renesas-ostm.c
+++ b/drivers/clocksource/renesas-ostm.c
@@ -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
--
2.17.1

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