diff options
Diffstat (limited to 'target/linux/sunxi/patches-3.13/180-6-usb-ehci-change-compat-string.patch')
| -rw-r--r-- | target/linux/sunxi/patches-3.13/180-6-usb-ehci-change-compat-string.patch | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/target/linux/sunxi/patches-3.13/180-6-usb-ehci-change-compat-string.patch b/target/linux/sunxi/patches-3.13/180-6-usb-ehci-change-compat-string.patch new file mode 100644 index 0000000..5222422 --- /dev/null +++ b/target/linux/sunxi/patches-3.13/180-6-usb-ehci-change-compat-string.patch @@ -0,0 +1,83 @@ +From 80c544c77beeffee4e9484bf193ab391297688cd Mon Sep 17 00:00:00 2001 +From: Hans de Goede <hdegoede@redhat.com> +Date: Tue, 11 Feb 2014 11:46:13 +0100 +Subject: [PATCH] ehci-platform: Change compatible string from usb-ehci to + generic-ehci + +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 chosen something different, 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 depend on driver registration order. + +This patch changes the compatible string claimed by ehci-platform to +"generic-ehci", avoiding the driver registration / module loading ordering +problems, and removes the "depends on !PPC_OF" workaround. + +Signed-off-by: Hans de Goede <hdegoede@redhat.com> +--- + 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..ff151ec 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 "generic-ehci". + - 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", "generic-ehci"; + 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..1178730 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 = "generic-ehci", }, + {} + }; + MODULE_DEVICE_TABLE(of, vt8500_ehci_ids); +-- +1.8.5.5 + |