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83 lines
3.4 KiB
83 lines
3.4 KiB
From 80c544c77beeffee4e9484bf193ab391297688cd Mon Sep 17 00:00:00 2001
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From: Hans de Goede <hdegoede@redhat.com>
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Date: Tue, 11 Feb 2014 11:46:13 +0100
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Subject: [PATCH] ehci-platform: Change compatible string from usb-ehci to
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generic-ehci
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The initial versions of the devicetree enablement patches for ehci-platform
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used "ehci-platform" as compatible string. However this was disliked by various
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reviewers because the platform bus is a Linux invention and devicetree is
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supposed to be OS agnostic. After much discussion I gave up, added a:
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"depends on !PPC_OF" to Kconfig to avoid a known conflict with PPC-OF platforms
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and went with the generic usb-ehci as requested.
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In retro-spect I should have chosen something different, the dts files for many
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existing boards already claim to be compatible with "usb-ehci", ie they have:
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compatible = "ti,ehci-omap", "usb-ehci";
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In theory this should not be a problem since the "ti,ehci-omap" entry takes
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presedence, but in practice using a conflicting compatible string is an issue,
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because it makes which driver gets used depend on driver registration order.
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This patch changes the compatible string claimed by ehci-platform to
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"generic-ehci", avoiding the driver registration / module loading ordering
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problems, and removes the "depends on !PPC_OF" workaround.
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Signed-off-by: Hans de Goede <hdegoede@redhat.com>
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---
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Documentation/devicetree/bindings/usb/usb-ehci.txt | 4 ++--
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drivers/usb/host/Kconfig | 1 -
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drivers/usb/host/ehci-platform.c | 2 +-
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3 files changed, 3 insertions(+), 4 deletions(-)
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diff --git a/Documentation/devicetree/bindings/usb/usb-ehci.txt b/Documentation/devicetree/bindings/usb/usb-ehci.txt
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index 2c1aeeb..ff151ec 100644
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--- a/Documentation/devicetree/bindings/usb/usb-ehci.txt
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+++ b/Documentation/devicetree/bindings/usb/usb-ehci.txt
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@@ -1,7 +1,7 @@
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USB EHCI controllers
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Required properties:
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- - compatible : should be "usb-ehci".
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+ - compatible : should be "generic-ehci".
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- reg : should contain at least address and length of the standard EHCI
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register set for the device. Optional platform-dependent registers
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(debug-port or other) can be also specified here, but only after
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@@ -27,7 +27,7 @@ Example (Sequoia 440EPx):
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Example (Allwinner sun4i A10 SoC):
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ehci0: usb@01c14000 {
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- compatible = "allwinner,sun4i-a10-ehci", "usb-ehci";
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+ compatible = "allwinner,sun4i-a10-ehci", "generic-ehci";
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reg = <0x01c14000 0x100>;
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interrupts = <39>;
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clocks = <&ahb_gates 1>;
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diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
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index e28cbe0..a9707da 100644
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--- a/drivers/usb/host/Kconfig
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+++ b/drivers/usb/host/Kconfig
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@@ -255,7 +255,6 @@ config USB_EHCI_ATH79
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config USB_EHCI_HCD_PLATFORM
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tristate "Generic EHCI driver for a platform device"
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- depends on !PPC_OF
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default n
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---help---
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Adds an EHCI host driver for a generic platform device, which
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diff --git a/drivers/usb/host/ehci-platform.c b/drivers/usb/host/ehci-platform.c
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index 8fde649..1178730 100644
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--- a/drivers/usb/host/ehci-platform.c
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+++ b/drivers/usb/host/ehci-platform.c
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@@ -333,7 +333,7 @@ static int ehci_platform_resume(struct device *dev)
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static const struct of_device_id vt8500_ehci_ids[] = {
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{ .compatible = "via,vt8500-ehci", },
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{ .compatible = "wm,prizm-ehci", },
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- { .compatible = "usb-ehci", },
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+ { .compatible = "generic-ehci", },
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{}
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};
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MODULE_DEVICE_TABLE(of, vt8500_ehci_ids);
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--
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1.8.5.5
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