linux-kernel - Re: [PATCH v3 06/10] mtd: brcmstb

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Date:	Wed, 06 May 2015 21:12:43 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Brian Norris <computersforpeace@...il.com>
Cc:	linux-mtd@...ts.infradead.org, Dmitry Torokhov <dtor@...gle.com>,
	Anatol Pomazao <anatol@...gle.com>,
	Ray Jui <rjui@...adcom.com>,
	Corneliu Doban <cdoban@...adcom.com>,
	Jonathan Richardson <jonathar@...adcom.com>,
	Scott Branden <sbranden@...adcom.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Rafał Miłecki <zajec5@...il.com>,
	bcm-kernel-feedback-list@...adcom.com,
	Dan Ehrenberg <dehrenberg@...omium.org>,
	Gregory Fong <gregory.0xf0@...il.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	Kevin Cernekee <cernekee@...il.com>
Subject: Re: [PATCH v3 06/10] mtd: brcmstb_nand: add SoC-specific support

On Wednesday 06 May 2015 10:59:50 Brian Norris wrote:
> +       /*
> +        * Some SoCs integrate this controller (e.g., its interrupt bits) in
> +        * interesting ways
> +        */
> +       if (of_property_read_bool(dn, "brcm,nand-soc")) {
> +               struct device_node *soc_dn;
> +
> +               soc_dn = of_parse_phandle(dn, "brcm,nand-soc", 0);
> +               if (!soc_dn)
> +                       return -ENODEV;
> +
> +               ctrl->soc = devm_brcmnand_probe_soc(dev, soc_dn);
> +               if (!ctrl->soc) {
> +                       dev_err(dev, "could not probe SoC data\n");
> +                       of_node_put(soc_dn);
> +                       return -ENODEV;
> +               }
> +
> +               ret = devm_request_irq(dev, ctrl->irq, brcmnand_irq, 0,
> +                                      DRV_NAME, ctrl);
> +
> +               /* Enable interrupt */
> +               ctrl->soc->ctlrdy_set_enabled(ctrl->soc, true);
> +
> +               of_node_put(soc_dn);
> +       } else {
> +               /* Use standard interrupt infrastructure */
> +               ret = devm_request_irq(dev, ctrl->irq, brcmnand_ctlrdy_irq, 0,
> +                                      DRV_NAME, ctrl);
> +       }
> 

It looks to me like this should be handled as a nested irqchip, so the node
you look up gets used as the "interrupt-parent" instead, making the behavior
of this SoC transparent to the nand driver.

We recently merged nested irqdomain support as well, which might help here,
or might not be needed.

	Arnd

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