linux-kernel - Re: [PATCH v5 02/14] irqchip: irq-pic32-evic: Add support for PIC32 interrupt controller

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Date:	Thu, 14 Jan 2016 09:10:09 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Joshua Henderson <joshua.henderson@...rochip.com>
cc:	linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org,
	ralf@...ux-mips.org,
	Cristian Birsan <cristian.birsan@...rochip.com>,
	Jason Cooper <jason@...edaemon.net>,
	Marc Zyngier <marc.zyngier@....com>
Subject: Re: [PATCH v5 02/14] irqchip: irq-pic32-evic: Add support for PIC32
 interrupt controller

On Wed, 13 Jan 2016, Joshua Henderson wrote:
> +static int pic32_set_type_edge(struct irq_data *data,
> +			       unsigned int flow_type)
> +{
> +	struct evic_chip_data *priv = irqd_to_priv(data);
> +	int ret;
> +	int i;
> +
> +	if (!(flow_type & IRQ_TYPE_EDGE_BOTH))
> +		return -EBADR;
> +
> +	/* set polarity for external interrupts only */
> +	for (i = 0; i < ARRAY_SIZE(priv->ext_irqs); i++) {
> +		if (priv->ext_irqs[i] == data->hwirq) {
> +			ret = pic32_set_ext_polarity(i + 1, flow_type);
> +			if (ret)
> +				return ret;
> +		}
> +	}
> +
> +	irqd_set_trigger_type(data, flow_type);

The core code handles that already.

> +static int pic32_irq_domain_map(struct irq_domain *d, unsigned int virq,
> +				irq_hw_number_t hw)
> +{
> +	struct evic_chip_data *priv = d->host_data;
> +	struct irq_data *data;
> +	int ret;
> +	u32 iecclr, ifsclr;
> +	u32 reg, mask;
> +
> +	ret = irq_map_generic_chip(d, virq, hw);
> +	if (ret)
> +		return ret;
> +
> +	/*
> +	 * Piggyback on xlate function to move to an alternate chip as necessary
> +	 * at time of mapping instead of allowing the flow handler/chip to be
> +	 * changed later. This requires all interrupts to be configured through
> +	 * DT.
> +	 */
> +	if (priv->irq_types[hw] & IRQ_TYPE_SENSE_MASK) {
> +		data = irq_domain_get_irq_data(d, virq);
> +		irqd_set_trigger_type(data, priv->irq_types[hw]);
> +		irq_setup_alt_chip(data, priv->irq_types[hw]);
> +	}

I like that approach.

So except for the nit in pic32_set_type_edge() this looks good. It's pretty
clear now what the code does and how the hardware works.

Thanks for following up!

       tglx