linux-kernel - Re: [PATCH 11/21] irqchip: Add irqchip for ADI ADSP-SC5xx platform

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Message-ID: <26b53051-0502-41dd-99f4-6d2cf2eb9920@kernel.org>
Date: Mon, 16 Sep 2024 08:56:15 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: arturs.artamonovs@...log.com, Catalin Marinas <catalin.marinas@....com>,
 Will Deacon <will@...nel.org>, Greg Malysa <greg.malysa@...esys.com>,
 Philipp Zabel <p.zabel@...gutronix.de>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Utsav Agarwal <Utsav.Agarwal@...log.com>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd
 <sboyd@...nel.org>, Linus Walleij <linus.walleij@...aro.org>,
 Bartosz Golaszewski <brgl@...ev.pl>, Thomas Gleixner <tglx@...utronix.de>,
 Andi Shyti <andi.shyti@...nel.org>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Jiri Slaby <jirislaby@...nel.org>, Arnd Bergmann <arnd@...db.de>,
 Olof Johansson <olof@...om.net>, soc@...nel.org
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 devicetree@...r.kernel.org, linux-clk@...r.kernel.org,
 linux-gpio@...r.kernel.org, linux-i2c@...r.kernel.org,
 linux-serial@...r.kernel.org, adsp-linux@...log.com,
 Nathan Barrett-Morrison <nathan.morrison@...esys.com>
Subject: Re: [PATCH 11/21] irqchip: Add irqchip for ADI ADSP-SC5xx platform

On 12/09/2024 20:24, Arturs Artamonovs via B4 Relay wrote:
> From: Arturs Artamonovs <arturs.artamonovs@...log.com>
> 
> Support seting extra indepdendent interrupt on pin activity.
> 
> Signed-off-by: Arturs Artamonovs <Arturs.Artamonovs@...log.com>
> Co-developed-by: Nathan Barrett-Morrison <nathan.morrison@...esys.com>
> Signed-off-by: Nathan Barrett-Morrison <nathan.morrison@...esys.com>
> Co-developed-by: Greg Malysa <greg.malysa@...esys.com>
> Signed-off-by: Greg Malysa <greg.malysa@...esys.com>
> ---
>  drivers/irqchip/Kconfig        |   9 ++
>  drivers/irqchip/Makefile       |   2 +
>  drivers/irqchip/irq-adi-adsp.c | 310 +++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 321 insertions(+)
> 
> diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
> index d078bdc48c38f13af9a129974f3b637dfee0e40f..1bc8f1bd45b3d2f69d2d0e6c8fa01b17b12ce241 100644
> --- a/drivers/irqchip/Kconfig
> +++ b/drivers/irqchip/Kconfig
> @@ -91,6 +91,15 @@ config ALPINE_MSI
>  	select PCI_MSI
>  	select GENERIC_IRQ_CHIP
>  
> +config ADI_ADSP_IRQ
> +	bool "ADI PORT PINT Driver"

What is "PORT"?
What is "PINT"?
> +	depends on OF
> +	depends on (ARCH_SC59X_64 || ARCH_SC59X)

Missing compile test.

> +	select IRQ_DOMAIN
> +	help
> +	  Say Y to enable the PORT-based PINT interrupt controller for

Expand acronyms here.

> +	  Analog Devices ADSP devices.
> +
>  config AL_FIC
>  	bool "Amazon's Annapurna Labs Fabric Interrupt Controller"
>  	depends on OF
> diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
> index 15635812b2d6605a2dd3bb0e5fb3170ab2cb0f77..258a188676fd97e713f3cebe16e3d563add095f3 100644
> --- a/drivers/irqchip/Makefile
> +++ b/drivers/irqchip/Makefile
> @@ -1,6 +1,8 @@
>  # SPDX-License-Identifier: GPL-2.0
>  obj-$(CONFIG_IRQCHIP)			+= irqchip.o
>  
> +

Why?

> +obj-$(CONFIG_ADI_ADSP_IRQ)		+= irq-adi-adsp.o
>  obj-$(CONFIG_AL_FIC)			+= irq-al-fic.o
>  obj-$(CONFIG_ALPINE_MSI)		+= irq-alpine-msi.o

...


> +
> +static int adsp_pint_irq_set_type(struct irq_data *d, unsigned int type)
> +{
> +	struct adsp_pint *pint = irq_data_get_irq_chip_data(d);
> +	unsigned int pos = BIT(d->hwirq);
> +
> +	switch (type) {
> +	case IRQ_TYPE_PROBE:
> +		type = IRQ_TYPE_EDGE_BOTH;
> +		fallthrough;
> +	case IRQ_TYPE_EDGE_BOTH:
> +		/* start by looking for rising edge */
> +		writel(pos, pint->regs + ADSP_PINT_REG_INVERT_CLEAR);
> +		writel(pos, pint->regs + ADSP_PINT_REG_EDGE_SET);
> +		return 0;
> +
> +	case IRQ_TYPE_EDGE_FALLING:
> +		writel(pos, pint->regs + ADSP_PINT_REG_INVERT_SET);
> +		writel(pos, pint->regs + ADSP_PINT_REG_EDGE_SET);
> +		return 0;
> +
> +	case IRQ_TYPE_EDGE_RISING:
> +		writel(pos, pint->regs + ADSP_PINT_REG_INVERT_CLEAR);
> +		writel(pos, pint->regs + ADSP_PINT_REG_EDGE_SET);
> +		return 0;
> +
> +	case IRQ_TYPE_LEVEL_HIGH:
> +		writel(pos, pint->regs + ADSP_PINT_REG_INVERT_CLEAR);
> +		writel(pos, pint->regs + ADSP_PINT_REG_EDGE_CLEAR);
> +		return 0;
> +
> +	case IRQ_TYPE_LEVEL_LOW:
> +		writel(pos, pint->regs + ADSP_PINT_REG_INVERT_SET);
> +		writel(pos, pint->regs + ADSP_PINT_REG_EDGE_CLEAR);
> +		return 0;
> +
> +	default:
> +		return -EINVAL;
> +	}
> +

Fix blank line issues everywhere.

> +}
> +
> +static int adsp_pint_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct device_node *np = dev->of_node;
> +	struct adsp_pint *pint;
> +
> +	pint = devm_kzalloc(dev, sizeof(*pint), GFP_KERNEL);
> +	if (!pint)
> +		return -ENOMEM;
> +
> +	pint->regs = devm_platform_ioremap_resource(pdev, 0);
> +	if (IS_ERR(pint->regs))
> +		return PTR_ERR(pint->regs);
> +
> +	pint->chip.name = "adsp-pint";
> +	pint->chip.irq_ack = adsp_pint_irq_ack;
> +	pint->chip.irq_mask = adsp_pint_irq_mask;
> +	pint->chip.irq_unmask = adsp_pint_irq_unmask;
> +	pint->chip.irq_set_type = adsp_pint_irq_set_type;
> +	// @todo potentially only SEC supports wake options, not gic
> +
> +	// @todo determine if we actually need a raw spinlock
> +
> +	pint->domain = irq_domain_add_linear(np, ADSP_PINT_IRQS,
> +		&adsp_irq_domain_ops, pint);
> +	if (!pint->domain) {
> +		dev_err(dev, "Could not create irq domain\n");
> +		return -EINVAL;
> +	}
> +
> +	pint->irq = platform_get_irq(pdev, 0);
> +	if (!pint->irq) {

That's a bug, technically. Read the doc. Why -EINVAL is a valid interrupt?

> +		dev_err(dev, "Could not find parent interrupt for port\n");
> +		return -EINVAL;
> +	}
> +
> +	irq_set_chained_handler_and_data(pint->irq, adsp_pint_irq_handler, pint);
> +	platform_set_drvdata(pdev, pint);
> +
> +	return 0;
> +}
> +
> +static void adsp_pint_remove(struct platform_device *pdev)
> +{
> +	struct adsp_pint *pint = platform_get_drvdata(pdev);
> +
> +	irq_set_chained_handler_and_data(pint->irq, NULL, NULL);
> +	irq_domain_remove(pint->domain);
> +}
> +
> +static const struct of_device_id adsp_pint_of_match[] = {
> +	{ .compatible = "adi,adsp-pint" },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, adsp_pint_of_match);
> +
> +static struct platform_driver adsp_pint_driver = {
> +	.driver = {
> +		.name = "adsp-port-pint",

Bindings are always before the users.

Best regards,
Krzysztof