The initial versions of the devicetree enablement patches for ehci-platform
used "ehci-platform" as compatible string. However this was disliked by various
reviewers because the platform bus is a Linux invention and devicetree is
supposed to be OS agnostic. After much discussion I gave up, added a:
"depends on !PPC_OF" to Kconfig to avoid a known conflict with PPC-OF platforms
and went with the generic usb-ehci as requested.
In retro-spect I should have stuck to my guns, because the dts files for many
existing boards already claim to be compatible with "usb-ehci", ie they have:
compatible = "ti,ehci-omap", "usb-ehci";
In theory this should not be a problem since the "ti,ehci-omap" entry takes
presedence, but in practice using a conflicting compatible string is an issue,
because it makes which driver gets used depent on driver registration order.
This patch changes the compatible string claimed by ehci-platform (back) to
"ehci-platform", avoiding the driver registration / module loading ordering
problems, and removes the "depends on !PPC_OF" workaround.
Note that there already is a precedent for using ?hci-platform, in the form
of xhci-platform.c using "xhci-platfrom" as compatible string.
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
---
Documentation/devicetree/bindings/usb/usb-ehci.txt | 4 ++--
drivers/usb/host/Kconfig | 1 -
drivers/usb/host/ehci-platform.c | 2 +-
3 files changed, 3 insertions(+), 4 deletions(-)
diff --git a/Documentation/devicetree/bindings/usb/usb-ehci.txt b/Documentation/devicetree/bindings/usb/usb-ehci.txt
index 2c1aeeb..46f428a 100644
--- a/Documentation/devicetree/bindings/usb/usb-ehci.txt
+++ b/Documentation/devicetree/bindings/usb/usb-ehci.txt
@@ -1,7 +1,7 @@
USB EHCI controllers
Required properties:
- - compatible : should be "usb-ehci".
+ - compatible : should be "ehci-platform".
- reg : should contain at least address and length of the standard EHCI
register set for the device. Optional platform-dependent registers
(debug-port or other) can be also specified here, but only after
@@ -27,7 +27,7 @@ Example (Sequoia 440EPx):
Example (Allwinner sun4i A10 SoC):
ehci0: usb@01c14000 {
- compatible = "allwinner,sun4i-a10-ehci", "usb-ehci";
+ compatible = "allwinner,sun4i-a10-ehci", "ehci-platform";
reg = <0x01c14000 0x100>;
interrupts = <39>;
clocks = <&ahb_gates 1>;
diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index e28cbe0..a9707da 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -255,7 +255,6 @@ config USB_EHCI_ATH79
config USB_EHCI_HCD_PLATFORM
tristate "Generic EHCI driver for a platform device"
- depends on !PPC_OF
default n
---help---
Adds an EHCI host driver for a generic platform device, which
diff --git a/drivers/usb/host/ehci-platform.c b/drivers/usb/host/ehci-platform.c
index 8fde649..4f4d78f 100644
--- a/drivers/usb/host/ehci-platform.c
+++ b/drivers/usb/host/ehci-platform.c
@@ -333,7 +333,7 @@ static int ehci_platform_resume(struct device *dev)
static const struct of_device_id vt8500_ehci_ids[] = {
{ .compatible = "via,vt8500-ehci", },
{ .compatible = "wm,prizm-ehci", },
- { .compatible = "usb-ehci", },
+ { .compatible = "ehci-platform", },
{}
};
MODULE_DEVICE_TABLE(of, vt8500_ehci_ids);
--
1.8.5.3
--
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