linux-kernel - Re: [PATCH] clocksource/drivers/timer-sun4i: Partially convert to a platform driver

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Message-ID: <42665ccc-d020-48c4-a5bb-2713f7cbb75c@linaro.org>
Date: Wed, 13 Mar 2024 15:43:19 +0100
From: Daniel Lezcano <daniel.lezcano@...aro.org>
To: Samuel Holland <samuel.holland@...ive.com>,
 Thomas Gleixner <tglx@...utronix.de>
Cc: Anup Patel <apatel@...tanamicro.com>, Chen-Yu Tsai <wens@...e.org>,
 Jernej Skrabec <jernej.skrabec@...il.com>,
 Paul Walmsley <paul.walmsley@...ive.com>,
 Samuel Holland <samuel@...lland.org>, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
 linux-sunxi@...ts.linux.dev
Subject: Re: [PATCH] clocksource/drivers/timer-sun4i: Partially convert to a
 platform driver

On 12/03/2024 20:25, Samuel Holland wrote:
> Commit 8ec99b033147 ("irqchip/sifive-plic: Convert PLIC driver into a
> platform driver") broke the MMIO timer on the Allwinner D1 SoC because
> the IRQ domain is no longer available when timer_probe() is called:

Did you mean: s/no longer available/not yet available/ ?


>    [    0.000000] irq: no irq domain found for interrupt-controller@...00000 !
>    [    0.000000] Failed to map interrupt for /soc/timer@...0000
>    [    0.000000] Failed to initialize '/soc/timer@...0000': -22
> 
> Fix this by wrapping the timer initialization in a platform driver.
> builtin_platform_driver_probe() must be used because the driver uses
> timer_of_init(), which is marked as __init. Only convert the sun8i
> variants of the hardware, because some older SoCs still need the timer
> probed early for sched_clock().
> 
> Fixes: 8ec99b033147 ("irqchip/sifive-plic: Convert PLIC driver into a platform driver")
> Signed-off-by: Samuel Holland <samuel.holland@...ive.com>
> ---
> 
>   drivers/clocksource/timer-sun4i.c | 24 ++++++++++++++++++++----
>   1 file changed, 20 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/clocksource/timer-sun4i.c b/drivers/clocksource/timer-sun4i.c
> index 7bdcc60ad43c..728dac2baa84 100644
> --- a/drivers/clocksource/timer-sun4i.c
> +++ b/drivers/clocksource/timer-sun4i.c
> @@ -20,6 +20,7 @@
>   #include <linux/of.h>
>   #include <linux/of_address.h>
>   #include <linux/of_irq.h>
> +#include <linux/platform_device.h>
>   
>   #include "timer-of.h"
>   
> @@ -218,9 +219,24 @@ static int __init sun4i_timer_init(struct device_node *node)
>   }
>   TIMER_OF_DECLARE(sun4i, "allwinner,sun4i-a10-timer",
>   		       sun4i_timer_init);
> -TIMER_OF_DECLARE(sun8i_a23, "allwinner,sun8i-a23-timer",
> -		 sun4i_timer_init);
> -TIMER_OF_DECLARE(sun8i_v3s, "allwinner,sun8i-v3s-timer",
> -		 sun4i_timer_init);
>   TIMER_OF_DECLARE(suniv, "allwinner,suniv-f1c100s-timer",
>   		       sun4i_timer_init);
> +
> +static int __init sun4i_timer_probe(struct platform_device *pdev)
> +{
> +	return sun4i_timer_init(dev_of_node(&pdev->dev));
> +}
> +
> +static const struct of_device_id sun4i_timer_of_match[] = {
> +	{ .compatible = "allwinner,sun8i-a23-timer" },
> +	{ .compatible = "allwinner,sun8i-v3s-timer" },
> +	{ /* sentinel */ }
> +};
> +
> +static struct platform_driver sun4i_timer_driver = {
> +	.driver	= {
> +		.name		= "sun4i-timer",
> +		.of_match_table	= sun4i_timer_of_match,
> +	},
> +};
> +builtin_platform_driver_probe(sun4i_timer_driver, sun4i_timer_probe);

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