Re: [PATCH v1 05/30] soc: sifive: l2 cache: Convert to platform driver

From: Conor Dooley <conor@kernel.org>
To: Hal Feng <hal.feng@linux.starfivetech.com>
Cc: linux-riscv@lists.infradead.org, devicetree@vger.kernel.org,
	linux-clk@vger.kernel.org, linux-gpio@vger.kernel.org,
	Rob Herring <robh+dt@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Daniel Lezcano <daniel.lezcano@linaro.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Marc Zyngier <maz@kernel.org>,
	Philipp Zabel <p.zabel@pengutronix.de>,
	Stephen Boyd <sboyd@kernel.org>,
	Michael Turquette <mturquette@baylibre.com>,
	Linus Walleij <linus.walleij@linaro.org>,
	Emil Renner Berthing <kernel@esmil.dk>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v1 05/30] soc: sifive: l2 cache: Convert to platform driver
Date: Thu, 29 Sep 2022 16:32:04 +0100	[thread overview]
Message-ID: <YzW6dEGsbSXKFtGu@spud> (raw)
In-Reply-To: <20220929143225.17907-6-hal.feng@linux.starfivetech.com>

On Thu, Sep 29, 2022 at 10:32:00PM +0800, Hal Feng wrote:
> From: Emil Renner Berthing <kernel@esmil.dk>
> 
> This converts the driver to use the builtin_platform_driver_probe macro
> to initialize the driver. This macro ends up calling device_initcall as
> was used previously, but also allocates a platform device which gives us
> access to much nicer APIs such as platform_ioremap_resource,
> platform_get_irq and dev_err_probe.

You should resend the series ignoring this comment, but for v2, I think
you should pay attention to following patchset:

https://lore.kernel.org/linux-riscv/20220913061817.22564-1-zong.li@sifive.com/

Hopefully by the time you get to a v2, that patchset will have been
applied as 6.1 material..

Thanks,
Conor.

> 
> Signed-off-by: Emil Renner Berthing <kernel@esmil.dk>
> Signed-off-by: Hal Feng <hal.feng@linux.starfivetech.com>
> ---
>  drivers/soc/sifive/sifive_l2_cache.c | 79 ++++++++++++++--------------
>  1 file changed, 40 insertions(+), 39 deletions(-)
> 
> diff --git a/drivers/soc/sifive/sifive_l2_cache.c b/drivers/soc/sifive/sifive_l2_cache.c
> index 59640a1d0b28..010d612f7420 100644
> --- a/drivers/soc/sifive/sifive_l2_cache.c
> +++ b/drivers/soc/sifive/sifive_l2_cache.c
> @@ -7,9 +7,9 @@
>   */
>  #include <linux/debugfs.h>
>  #include <linux/interrupt.h>
> -#include <linux/of_irq.h>
> -#include <linux/of_address.h>
> -#include <linux/device.h>
> +#include <linux/io.h>
> +#include <linux/mod_devicetable.h>
> +#include <linux/platform_device.h>
>  #include <asm/cacheinfo.h>
>  #include <soc/sifive/sifive_l2_cache.h>
>  
> @@ -96,12 +96,6 @@ static void l2_config_read(void)
>  	pr_info("L2CACHE: Index of the largest way enabled: %d\n", regval);
>  }
>  
> -static const struct of_device_id sifive_l2_ids[] = {
> -	{ .compatible = "sifive,fu540-c000-ccache" },
> -	{ .compatible = "sifive,fu740-c000-ccache" },
> -	{ /* end of table */ },
> -};
> -
>  static ATOMIC_NOTIFIER_HEAD(l2_err_chain);
>  
>  int register_sifive_l2_error_notifier(struct notifier_block *nb)
> @@ -192,36 +186,29 @@ static irqreturn_t l2_int_handler(int irq, void *device)
>  	return IRQ_HANDLED;
>  }
>  
> -static int __init sifive_l2_init(void)
> +static int __init sifive_l2_probe(struct platform_device *pdev)
>  {
> -	struct device_node *np;
> -	struct resource res;
> -	int i, rc, intr_num;
> -
> -	np = of_find_matching_node(NULL, sifive_l2_ids);
> -	if (!np)
> -		return -ENODEV;
> -
> -	if (of_address_to_resource(np, 0, &res))
> -		return -ENODEV;
> -
> -	l2_base = ioremap(res.start, resource_size(&res));
> -	if (!l2_base)
> -		return -ENOMEM;
> -
> -	intr_num = of_property_count_u32_elems(np, "interrupts");
> -	if (!intr_num) {
> -		pr_err("L2CACHE: no interrupts property\n");
> -		return -ENODEV;
> -	}
> -
> -	for (i = 0; i < intr_num; i++) {
> -		g_irq[i] = irq_of_parse_and_map(np, i);
> -		rc = request_irq(g_irq[i], l2_int_handler, 0, "l2_ecc", NULL);
> -		if (rc) {
> -			pr_err("L2CACHE: Could not request IRQ %d\n", g_irq[i]);
> -			return rc;
> -		}
> +	struct device *dev = &pdev->dev;
> +	int nirqs;
> +	int ret;
> +	int i;
> +
> +	l2_base = devm_platform_ioremap_resource(pdev, 0);
> +	if (IS_ERR(l2_base))
> +		return PTR_ERR(l2_base);
> +
> +	nirqs = platform_irq_count(pdev);
> +	if (nirqs <= 0)
> +		return dev_err_probe(dev, -ENODEV, "no interrupts\n");
> +
> +	for (i = 0; i < nirqs; i++) {
> +		g_irq[i] = platform_get_irq(pdev, i);
> +		if (g_irq[i] < 0)
> +			return g_irq[i];
> +
> +		ret = devm_request_irq(dev, g_irq[i], l2_int_handler, 0, pdev->name, NULL);
> +		if (ret)
> +			return dev_err_probe(dev, ret, "Could not request IRQ %d\n", g_irq[i]);
>  	}
>  
>  	l2_config_read();
> @@ -234,4 +221,18 @@ static int __init sifive_l2_init(void)
>  #endif
>  	return 0;
>  }
> -device_initcall(sifive_l2_init);
> +
> +static const struct of_device_id sifive_l2_match[] = {
> +	{ .compatible = "sifive,fu540-c000-ccache" },
> +	{ .compatible = "sifive,fu740-c000-ccache" },
> +	{ /* sentinel */ }
> +};
> +
> +static struct platform_driver sifive_l2_driver = {
> +	.driver = {
> +		.name = "sifive_l2_cache",
> +		.of_match_table = sifive_l2_match,
> +		.suppress_bind_attrs = true,
> +	},
> +};
> +builtin_platform_driver_probe(sifive_l2_driver, sifive_l2_probe);
> -- 
> 2.17.1
> 
> 
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