linux-kernel - Re: [PATCH v5 1/2] irqchip: add support for Layerscape external interrupt lines

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Message-ID: <alpine.DEB.2.21.1803011308440.1396@nanos.tec.linutronix.de>
Date:   Thu, 1 Mar 2018 13:16:47 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Rasmus Villemoes <rasmus.villemoes@...vas.dk>
cc:     Rob Herring <robh+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <marc.zyngier@....com>,
        Andy Tang <andy.tang@....com>,
        Alexander Stein <alexander.stein@...tec-electronic.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 1/2] irqchip: add support for Layerscape external
 interrupt lines

On Fri, 23 Feb 2018, Rasmus Villemoes wrote:
> +#include <linux/irq.h>
> +#include <linux/irqchip.h>
> +#include <linux/irqdomain.h>
> +#include <linux/of.h>

of.h is already included from of_irq.h and of_address.h

> +#include <linux/of_irq.h>
> +#include <linux/of_address.h>
> +static int
> +ls_extirq_set_type(struct irq_data *data, unsigned int type)
> +{
> +	irq_hw_number_t hwirq = data->hwirq;
> +	struct extirq_chip_data *chip_data = data->chip_data;
> +	u32 value, mask;

Please order local variables in reverse fir tree fashion whenever
possible. That's way simpler to read:

	struct extirq_chip_data *chip_data = data->chip_data;
	irq_hw_number_t hwirq = data->hwirq;
	u32 value, mask;

> +
> +	if (chip_data->bit_reverse)
> +		mask = 1U << (31 - hwirq);
> +	else
> +		mask = 1U << hwirq;
> +
> +	switch (type) {
> +	case IRQ_TYPE_LEVEL_LOW:
> +		type = IRQ_TYPE_LEVEL_HIGH;
> +		value = mask;
> +		break;
> +	case IRQ_TYPE_EDGE_FALLING:
> +		type = IRQ_TYPE_EDGE_RISING;
> +		value = mask;
> +		break;
> +	case IRQ_TYPE_LEVEL_HIGH:
> +	case IRQ_TYPE_EDGE_RISING:
> +		value = 0;
> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	regmap_update_bits(chip_data->syscon, chip_data->intpcr, mask, value);
> +
> +	data = data->parent_data;
> +	return data->chip->irq_set_type(data, type);

  	irq_chip_set_type_parent() 

Thanks,

	tglx