linux-kernel - Re: [PATCH 4/6] irqchip: add irqchip driver for nuc900

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Date:	Wed, 29 Jun 2016 17:27:53 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Wan Zongshun <vw@...mu.org>, Russell King <linux@...linux.org.uk>,
	devicetree@...r.kernel.org, Wan Zongshun <mcuos.com@...il.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 4/6] irqchip: add irqchip driver for nuc900

On Saturday, June 25, 2016 6:37:20 PM CEST Wan Zongshun wrote:
> +#define IRQ_WDT		W90X900_IRQ(1)
> +#define IRQ_WWDT	W90X900_IRQ(2)
> +#define IRQ_LVD		W90X900_IRQ(3)
> +#define IRQ_EXT0	W90X900_IRQ(4)
> +#define IRQ_EXT1	W90X900_IRQ(5)
> +#define IRQ_EXT2	W90X900_IRQ(6)
> +#define IRQ_EXT3	W90X900_IRQ(7)
> +#define IRQ_EXT4	W90X900_IRQ(8)
> +#define IRQ_EXT5	W90X900_IRQ(9)
> +#define IRQ_EXT6	W90X900_IRQ(10)

I'd suggest dropping the list, the contents are now in the dts.

> diff --git a/arch/arm/mach-w90x900/include/mach/nuc970-regs-aic.h b/arch/arm/mach-w90x900/include/mach/nuc970-regs-aic.h
> new file mode 100644
> index 0000000..7a77016
> --- /dev/null
> +++ b/arch/arm/mach-w90x900/include/mach/nuc970-regs-aic.h
> @@ -0,0 +1,53 @@
> +#ifndef __ASM_ARCH_REGS_AIC_H
> +#define __ASM_ARCH_REGS_AIC_H
> +
> +/*NUC970 AIC regs*/
> +
> +#define	REG_AIC_SCR1	0x00
> +#define	REG_AIC_SCR2	0x04
> +#define	REG_AIC_SCR3	0x08
> +#define	REG_AIC_SCR4	0x0C
> +#define	REG_AIC_SCR5	0x10

And like the clk driver, these should all be in the irqchip driver instead
of a separate header.

> +
> +static void __iomem *aic_base;
> +static struct irq_domain *aic_domain;
> +#define MAKE_HWIRQ(irqnum)	(irqnum)

The macro appears to be unused.

> +static void nuc970_irq_mask(struct irq_data *d)
> +{
> +	if (d->irq < 32)
> +		__raw_writel(1 << (d->irq), aic_base + REG_AIC_MDCR);
> +	else
> +		__raw_writel(1 << (d->irq - 32), aic_base + REG_AIC_MDCRH);
> +}

writel()

	Arnd