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clocksource/drivers/timer-mediatek: Convert to OF probing

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MediaTek APXGPT general purpose timer driver is registered via
TIMER_OF_DECLARE to be loaded early in the boot process. It depends on
a reference 13 MHz clock that is assigned via the clocks property of
its DT node.
On platforms like mt8516/mt8167 this clock is provided by a driver that
is loaded using OF probing and becomes available only later during boot.
This leads to a silent EDEFER error during timer init, which is not
recovered by TIMER_OF_DECLARE and GPT clocks are not registered at all.

Since those clocks are not critical for boot, convert the timer-mediatek
to OF probing and drop the TIMER_OF_DECLARE instructions.

Signed-off-by: Luca Leonardo Scorcia <l.scorcia@gmail.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org>
Link: https://patch.msgid.link/20261002072115.169250-3-l.scorcia@gmail.com
This commit is contained in:
Luca Leonardo Scorcia 2026-10-02 09:19:27 +02:00 committed by Daniel Lezcano
parent 8496a1d234
commit 7a097aba72
1 changed files with 31 additions and 5 deletions
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36
drivers/clocksource/timer-mediatek.c
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@ -13,6 +13,9 @@
#include <linux/clocksource.h>
#include <linux/interrupt.h>
#include <linux/irqreturn.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/sched_clock.h>
#include <linux/slab.h>
#include "timer-of.h"
@ -215,8 +218,7 @@ static irqreturn_t mtk_gpt_interrupt(int irq, void *dev_id)
return IRQ_HANDLED;
}
static void
__init mtk_gpt_setup(struct timer_of *to, u8 timer, u8 option)
static void mtk_gpt_setup(struct timer_of *to, u8 timer, u8 option)
{
writel(GPT_CTRL_CLEAR | GPT_CTRL_DISABLE,
timer_of_base(to) + GPT_CTRL_REG(timer));
@ -281,7 +283,7 @@ static struct timer_of to = {
},
};
static int __init mtk_syst_init(struct device_node *node)
static int mtk_syst_init(struct device_node *node)
{
int ret;
@ -339,5 +341,29 @@ static int __init mtk_gpt_init(struct device_node *node)
return 0;
}
TIMER_OF_DECLARE(mtk_mt6577, "mediatek,mt6577-timer", mtk_gpt_init);
TIMER_OF_DECLARE(mtk_mt6765, "mediatek,mt6765-timer", mtk_syst_init);
static int mtk_timer_probe(struct platform_device *pdev)
{
int (*timer_init)(struct device_node *node);
struct device_node *np = pdev->dev.of_node;
timer_init = of_device_get_match_data(&pdev->dev);
return timer_init(np);
}
static const struct of_device_id mtk_timer_match_table[] = {
{ .compatible = "mediatek,mt6577-timer", .data = mtk_gpt_init },
{ .compatible = "mediatek,mt6765-timer", .data = mtk_syst_init },
{ /* sentinel */ }
};
static struct platform_driver mtk_timer_driver = {
.probe = mtk_timer_probe,
.driver = {
.name = "mediatek-timer",
.of_match_table = mtk_timer_match_table,
},
};
module_platform_driver(mtk_timer_driver);
MODULE_DESCRIPTION("MediaTek Timer driver");