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f8410e6265
Compiling an irqchip driver as a platform driver needs to bunch of
things to be done right:
- Making sure the parent domain is initialized first
- Making sure the device can't be unbound from sysfs
- Disallowing module unload if it's built as a module
- Finding the parent node
- Etc.
Instead of trying to make sure all future irqchip platform drivers get
this right, provide boilerplate macros that take care of all of this.
An example use would look something like this. Where acme_foo_init and
acme_bar_init are similar to what would be passed to IRQCHIP_DECLARE.
IRQCHIP_PLATFORM_DRIVER_BEGIN(acme_irq)
IRQCHIP_MATCH("acme,foo", acme_foo_init)
IRQCHIP_MATCH("acme,bar", acme_bar_init)
IRQCHIP_PLATFORM_DRIVER_END(acme_irq)
Signed-off-by: Saravana Kannan <saravanak@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Cc: John Stultz <john.stultz@linaro.org>
Link: https://lore.kernel.org/r/20200718000637.3632841-2-saravanak@google.com
61 lines
1.8 KiB
C
61 lines
1.8 KiB
C
/*
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* Copyright (C) 2012 Thomas Petazzoni
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*
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* Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/acpi.h>
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#include <linux/init.h>
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#include <linux/of_device.h>
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#include <linux/of_irq.h>
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#include <linux/irqchip.h>
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#include <linux/platform_device.h>
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/*
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* This special of_device_id is the sentinel at the end of the
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* of_device_id[] array of all irqchips. It is automatically placed at
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* the end of the array by the linker, thanks to being part of a
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* special section.
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*/
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static const struct of_device_id
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irqchip_of_match_end __used __section(__irqchip_of_table_end);
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extern struct of_device_id __irqchip_of_table[];
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void __init irqchip_init(void)
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{
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of_irq_init(__irqchip_of_table);
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acpi_probe_device_table(irqchip);
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}
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int platform_irqchip_probe(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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struct device_node *par_np = of_irq_find_parent(np);
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of_irq_init_cb_t irq_init_cb = of_device_get_match_data(&pdev->dev);
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if (!irq_init_cb)
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return -EINVAL;
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if (par_np == np)
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par_np = NULL;
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/*
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* If there's a parent interrupt controller and none of the parent irq
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* domains have been registered, that means the parent interrupt
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* controller has not been initialized yet. it's not time for this
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* interrupt controller to initialize. So, defer probe of this
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* interrupt controller. The actual initialization callback of this
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* interrupt controller can check for specific domains as necessary.
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*/
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if (par_np && !irq_find_matching_host(np, DOMAIN_BUS_ANY))
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return -EPROBE_DEFER;
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return irq_init_cb(np, par_np);
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}
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EXPORT_SYMBOL_GPL(platform_irqchip_probe);
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