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irqchip/mbigen: Handle multiple device nodes in a mbigen module

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Each mbigen device is represented as a independent platform device. If the
devices belong to the same mbigen hardware module, then the register space for
these devices is the same. That leads to a resource conflict.

The solution for this is to represent the mbigen module as a platform device
and make the mbigen devices subdevices of that. The register space is
associated to the mbigen module and therefor the resource conflict is avoided.

[ tglx: Massaged changelog, cleaned up the code and removed the silly printk ]

Signed-off-by: Ma Jun <majun258@huawei.com>
Cc: mark.rutland@arm.com
Cc: jason@lakedaemon.net
Cc: marc.zyngier@arm.com
Cc: Catalin.Marinas@arm.com
Cc: guohanjun@huawei.com
Cc: Will.Deacon@arm.com
Cc: huxinwei@huawei.com
Cc: lizefan@huawei.com
Cc: dingtianhong@huawei.com
Cc: zhaojunhua@hisilicon.com
Cc: liguozhu@hisilicon.com
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/1458203641-17172-3-git-send-email-majun258@huawei.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
MaJun 2016-03-17 16:34:01 +08:00 committed by Thomas Gleixner
parent d0e286415d
commit ed2a1002d2
1 changed files with 25 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

40
drivers/irqchip/irq-mbigen.c
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@ -239,8 +239,11 @@ static struct irq_domain_ops mbigen_domain_ops = {
static int mbigen_device_probe(struct platform_device *pdev)
{
struct mbigen_device *mgn_chip;
struct resource *res;
struct platform_device *child;
struct irq_domain *domain;
struct device_node *np;
struct device *parent;
struct resource *res;
u32 num_pins;
mgn_chip = devm_kzalloc(&pdev->dev, sizeof(*mgn_chip), GFP_KERNEL);
@ -254,23 +257,30 @@ static int mbigen_device_probe(struct platform_device *pdev)
if (IS_ERR(mgn_chip->base))
return PTR_ERR(mgn_chip->base);
if (of_property_read_u32(pdev->dev.of_node, "num-pins", &num_pins) < 0) {
dev_err(&pdev->dev, "No num-pins property\n");
return -EINVAL;
for_each_child_of_node(pdev->dev.of_node, np) {
if (!of_property_read_bool(np, "interrupt-controller"))
continue;
parent = platform_bus_type.dev_root;
child = of_platform_device_create(np, NULL, parent);
if (IS_ERR(child))
return PTR_ERR(child);
if (of_property_read_u32(child->dev.of_node, "num-pins",
&num_pins) < 0) {
dev_err(&pdev->dev, "No num-pins property\n");
return -EINVAL;
}
domain = platform_msi_create_device_domain(&child->dev, num_pins,
mbigen_write_msg,
&mbigen_domain_ops,
mgn_chip);
if (!domain)
return -ENOMEM;
}
domain = platform_msi_create_device_domain(&pdev->dev, num_pins,
mbigen_write_msg,
&mbigen_domain_ops,
mgn_chip);
if (!domain)
return -ENOMEM;
platform_set_drvdata(pdev, mgn_chip);
dev_info(&pdev->dev, "Allocated %d MSIs\n", num_pins);
return 0;
}