A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-28 18:51:56 -04:00
Code Issues Projects Releases Packages Wiki Activity

of/pci: Add of_pci_get_max_link_speed() to parse max-link-speed from DT

Browse source 
This new helper function could be used by host drivers to get the limitaion
of max link speed provided by DT.  If the property isn't assigned or is
invalid, it will return -EINVAL to the caller.

Signed-off-by: Shawn Lin <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Acked-by: Rob Herring <[email protected]>
This commit is contained in:
Shawn Lin 2016-11-14 15:21:14 -06:00 • committed by Bjorn Helgaas
commit 9a1dc38912
2 changed files with 28 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

21
drivers/of/of_pci.c
View file

@ -119,6 +119,27 @@ int of_get_pci_domain_nr(struct device_node *node)
}
EXPORT_SYMBOL_GPL(of_get_pci_domain_nr);
/**
* This function will try to find the limitation of link speed by finding
* a property called "max-link-speed" of the given device node.
*
* @node: device tree node with the max link speed information
*
* Returns the associated max link speed from DT, or a negative value if the
* required property is not found or is invalid.
*/
int of_pci_get_max_link_speed(struct device_node *node)
{
u32 max_link_speed;
if (of_property_read_u32(node, "max-link-speed", &max_link_speed) ||
max_link_speed > 4)
return -EINVAL;
return max_link_speed;
}
EXPORT_SYMBOL_GPL(of_pci_get_max_link_speed);
/**
* of_pci_check_probe_only - Setup probe only mode if linux,pci-probe-only
* is present and valid