[PATCH V7 7/7] LPC: Add the ACPI LPC support
From: zhichang.yuan <hidden>
Date: 2017-03-13 02:18:49
Also in:
linux-acpi, linux-devicetree, linux-pci, linux-serial, lkml
Subsystem:
hisilicon lpc bus driver, the rest · Maintainers:
Jay Fang, Linus Torvalds
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 <redacted> Signed-off-by: John Garry <redacted> --- 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