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ACPI / platform: create LPSS clocks if Lynxpoint devices are found during scan

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Intel Lynxpoint LPSS peripheral drivers depend on LPSS clock tree being
created in order to function properly. The clock tree is exposed as a
platform driver that binds to a device named 'clk-lpt'.

To support this we modify the acpi_create_platform_device() to take one
additional parameter called flags. This is passed from
acpi_platform_device_ids[] array when acpi_create_platform_device() is
called.

We then introduce a new flag ACPI_PLATFORM_CLK which is used to tell
acpi_create_platform_device() to create the platform clocks as well.

Finally we set the ACPI_PLATFORM_CLK flags for all the Lynxpoint LPSS
devices and make sure that when this flag is set we create the
corresponding clock tree platform device.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Mika Westerberg 2013-01-18 13:46:01 +00:00 committed by Rafael J. Wysocki
parent 701190fd74
commit e375325ce5
3 changed files with 41 additions and 12 deletions
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25
drivers/acpi/acpi_platform.c
View File

@ -13,6 +13,7 @@
#include <linux/acpi.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
@ -21,9 +22,25 @@
ACPI_MODULE_NAME("platform");
static int acpi_create_platform_clks(struct acpi_device *adev)
{
static struct platform_device *pdev;
/* Create Lynxpoint LPSS clocks */
if (!pdev && !strncmp(acpi_device_hid(adev), "INT33C", 6)) {
pdev = platform_device_register_simple("clk-lpt", -1, NULL, 0);
if (IS_ERR(pdev))
return PTR_ERR(pdev);
}
return 0;
}
/**
* acpi_create_platform_device - Create platform device for ACPI device node
* @adev: ACPI device node to create a platform device for.
* @flags: ACPI_PLATFORM_* flags that affect the creation of the platform
* devices.
*
* Check if the given @adev can be represented as a platform device and, if
* that's the case, create and register a platform device, populate its common
@ -31,7 +48,8 @@ ACPI_MODULE_NAME("platform");
*
* Name of the platform device will be the same as @adev's.
*/
struct platform_device *acpi_create_platform_device(struct acpi_device *adev)
struct platform_device *acpi_create_platform_device(struct acpi_device *adev,
unsigned long flags)
{
struct platform_device *pdev = NULL;
struct acpi_device *acpi_parent;
@ -41,6 +59,11 @@ struct platform_device *acpi_create_platform_device(struct acpi_device *adev)
struct resource *resources;
int count;
if ((flags & ACPI_PLATFORM_CLK) && acpi_create_platform_clks(adev)) {
dev_err(&adev->dev, "failed to create clocks\n");
return NULL;
}
/* If the ACPI node already has a physical device attached, skip it. */
if (adev->physical_node_count)
return NULL;

6
drivers/acpi/internal.h
View File

@ -100,6 +100,10 @@ static inline void suspend_nvs_restore(void) {}
-------------------------------------------------------------------------- */
struct platform_device;
struct platform_device *acpi_create_platform_device(struct acpi_device *adev);
/* Flags for acpi_create_platform_device */
#define ACPI_PLATFORM_CLK BIT(0)
struct platform_device *acpi_create_platform_device(struct acpi_device *adev,
unsigned long flags);
#endif /* _ACPI_INTERNAL_H_ */

22
drivers/acpi/scan.c
View File

@ -38,14 +38,14 @@ static const struct acpi_device_id acpi_platform_device_ids[] = {
{ "PNP0D40" },
/* Haswell LPSS devices */
{ "INT33C0", 0 },
{ "INT33C1", 0 },
{ "INT33C2", 0 },
{ "INT33C3", 0 },
{ "INT33C4", 0 },
{ "INT33C5", 0 },
{ "INT33C6", 0 },
{ "INT33C7", 0 },
{ "INT33C0", ACPI_PLATFORM_CLK },
{ "INT33C1", ACPI_PLATFORM_CLK },
{ "INT33C2", ACPI_PLATFORM_CLK },
{ "INT33C3", ACPI_PLATFORM_CLK },
{ "INT33C4", ACPI_PLATFORM_CLK },
{ "INT33C5", ACPI_PLATFORM_CLK },
{ "INT33C6", ACPI_PLATFORM_CLK },
{ "INT33C7", ACPI_PLATFORM_CLK },
{ }
};
@ -1553,6 +1553,7 @@ static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
void *not_used, void **ret_not_used)
{
const struct acpi_device_id *id;
acpi_status status = AE_OK;
struct acpi_device *device;
unsigned long long sta_not_used;
@ -1568,9 +1569,10 @@ static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
if (acpi_bus_get_device(handle, &device))
return AE_CTRL_DEPTH;
if (!acpi_match_device_ids(device, acpi_platform_device_ids)) {
id = __acpi_match_device(device, acpi_platform_device_ids);
if (id) {
/* This is a known good platform device. */
acpi_create_platform_device(device);
acpi_create_platform_device(device, id->driver_data);
} else if (device_attach(&device->dev) < 0) {
status = AE_CTRL_DEPTH;
}