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Subject[PATCH V7 7/7] LPC: Add the ACPI LPC support
Date
The patch update the _CRS of LPC children based on the relevant LIBIO
interfaces. Then the ACPI platform device enumeration for LPC can apply the
right I/O resource to request the system I/O space from ioport_resource and
ensure the LPC peripherals work well.

Signed-off-by: zhichang.yuan <yuanzhichang@hisilicon.com>
Signed-off-by: John Garry <john.garry@huawei.com>
---
drivers/bus/hisi_lpc.c | 29 +++++++++++++++++++++++++++++
1 file changed, 29 insertions(+)

diff --git a/drivers/bus/hisi_lpc.c b/drivers/bus/hisi_lpc.c
index 345ea12..3796b1f 100644
--- a/drivers/bus/hisi_lpc.c
+++ b/drivers/bus/hisi_lpc.c
@@ -464,6 +464,27 @@ static int hisilpc_host_io_register(struct device *dev,

lpcdev->io_host = range;

+ /*
+ * For ACPI children, translate the bus-local I/O range to logical
+ * I/O range and set it as the current resource before the children
+ * are enumerated.
+ */
+ if (has_acpi_companion(dev)) {
+ struct acpi_device *root, *child;
+
+ root = to_acpi_device_node(dev->fwnode);
+ /* For hisilpc, only care about the sons of host. */
+ list_for_each_entry(child, &root->children, node) {
+ int ret;
+
+ ret = acpi_set_libio_resource(child, root);
+ if (ret) {
+ dev_err(&child->dev, "set resource failed..\n");
+ return ret;
+ }
+ }
+ }
+
return 0;
}

@@ -558,10 +579,18 @@ static int hisilpc_probe(struct platform_device *pdev)
{},
};

+#ifdef CONFIG_ACPI
+static const struct acpi_device_id hisilpc_acpi_match[] = {
+ {"HISI0191", },
+ {},
+};
+#endif
+
static struct platform_driver hisilpc_driver = {
.driver = {
.name = "hisi_lpc",
.of_match_table = hisilpc_of_match,
+ .acpi_match_table = ACPI_PTR(hisilpc_acpi_match),
},
.probe = hisilpc_probe,
};
--
1.9.1
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