[PATCH v2 0/2] ohci-/ehci-platform: Change compatible string to generic-?hci

[PATCH v2 0/2] ohci-/ehci-platform: Change compatible string to generic-?hci

[Hans de Goede]

Hi Greg,

And here is v2 of my ohci-/ehci-platform fixes for the regression of USB
support on various ARM boards I caused in linux-next.

As expected some people still did not like the ?hci-platform compatible
string I went for in v1, hence this v2. The good news is it seems everyone
seems to be able to live with generic-?hci as compatible now, so it seems this
issue is finally settled.

Please add these 2 patches to your usb-next tree, as said in the cover-letter
of v1, I'm fine with you squashing these into the first 2 patches of my
original series, but if you want them separate to preserve history that is
fine too.

Thanks & Regards,

Hans

[PATCH v2 1/2] ohci-platform: Change compatible string from usb-ohci to generic-ohci

[Hans de Goede]

The initial versions of the devicetree enablement patches for ohci-platform
used "ohci-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 and went with
the generic usb-ohci 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-ohci", ie they have:

	compatible = "ti,ohci-omap3", "usb-ohci";

In theory this should not be a problem since the "ti,ohci-omap3" 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 ohci-platform to
"generic-ohci", avoiding the driver registration / module loading ordering
problems.

Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
 Documentation/devicetree/bindings/usb/usb-ohci.txt | 4 ++--
 drivers/usb/host/ohci-platform.c                   | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/usb/usb-ohci.txt b/Documentation/devicetree/bindings/usb/usb-ohci.txt
index 6933b0c..45f67d9 100644
--- a/Documentation/devicetree/bindings/usb/usb-ohci.txt
+++ b/Documentation/devicetree/bindings/usb/usb-ohci.txt
@@ -1,7 +1,7 @@
 USB OHCI controllers
 
 Required properties:
-- compatible : "usb-ohci"
+- compatible : "generic-ohci"
 - reg : ohci controller register range (address and length)
 - interrupts : ohci controller interrupt
 
@@ -16,7 +16,7 @@ Optional properties:
 Example:
 
 	ohci0: usb@01c14400 {
-		compatible = "allwinner,sun4i-a10-ohci", "usb-ohci";
+		compatible = "allwinner,sun4i-a10-ohci", "generic-ohci";
 		reg = <0x01c14400 0x100>;
 		interrupts = <64>;
 		clocks = <&usb_clk 6>, <&ahb_gates 2>;
diff --git a/drivers/usb/host/ohci-platform.c b/drivers/usb/host/ohci-platform.c
index e2c28fd..b6ca0b2 100644
--- a/drivers/usb/host/ohci-platform.c
+++ b/drivers/usb/host/ohci-platform.c
@@ -319,7 +319,7 @@ static int ohci_platform_resume(struct device *dev)
 #endif /* CONFIG_PM */
 
 static const struct of_device_id ohci_platform_ids[] = {
-	{ .compatible = "usb-ohci", },
+	{ .compatible = "generic-ohci", },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, ohci_platform_ids);
-- 
1.8.5.3

Re: [PATCH v2 1/2] ohci-platform: Change compatible string from usb-ohci to generic-ohci

[Alan Stern]

On Tue, 11 Feb 2014, Hans de Goede wrote:

> The initial versions of the devicetree enablement patches for ohci-platform
> used "ohci-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 and went with
> the generic usb-ohci 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-ohci", ie they have:
> 
> 	compatible = "ti,ohci-omap3", "usb-ohci";
> 
> In theory this should not be a problem since the "ti,ohci-omap3" 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 ohci-platform to
> "generic-ohci", avoiding the driver registration / module loading ordering
> problems.
> 
> Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>

For both v2 patches:

Acked-by: Alan Stern <stern-nwvwT67g6+6dFdvTe/nMLpVzexx5G7lz@public.gmane.org>

Re: [PATCH v2 1/2] ohci-platform: Change compatible string from usb-ohci to generic-ohci

[Roger Quadros]

On 02/11/2014 06:35 PM, Hans de Goede wrote:
> The initial versions of the devicetree enablement patches for ohci-platform
> used "ohci-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 and went with
> the generic usb-ohci 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-ohci", ie they have:
> 
> 	compatible = "ti,ohci-omap3", "usb-ohci";
> 
> In theory this should not be a problem since the "ti,ohci-omap3" 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 ohci-platform to
> "generic-ohci", avoiding the driver registration / module loading ordering
> problems.
> 
> Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
> ---
>  Documentation/devicetree/bindings/usb/usb-ohci.txt | 4 ++--
>  drivers/usb/host/ohci-platform.c                   | 2 +-
>  2 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/usb/usb-ohci.txt b/Documentation/devicetree/bindings/usb/usb-ohci.txt
> index 6933b0c..45f67d9 100644
> --- a/Documentation/devicetree/bindings/usb/usb-ohci.txt
> +++ b/Documentation/devicetree/bindings/usb/usb-ohci.txt
> @@ -1,7 +1,7 @@
>  USB OHCI controllers
>  
>  Required properties:
> -- compatible : "usb-ohci"
> +- compatible : "generic-ohci"
>  - reg : ohci controller register range (address and length)
>  - interrupts : ohci controller interrupt
>  
> @@ -16,7 +16,7 @@ Optional properties:
>  Example:
>  
>  	ohci0: usb@01c14400 {
> -		compatible = "allwinner,sun4i-a10-ohci", "usb-ohci";
> +		compatible = "allwinner,sun4i-a10-ohci", "generic-ohci";
>  		reg = <0x01c14400 0x100>;
>  		interrupts = <64>;
>  		clocks = <&usb_clk 6>, <&ahb_gates 2>;
> diff --git a/drivers/usb/host/ohci-platform.c b/drivers/usb/host/ohci-platform.c
> index e2c28fd..b6ca0b2 100644
> --- a/drivers/usb/host/ohci-platform.c
> +++ b/drivers/usb/host/ohci-platform.c
> @@ -319,7 +319,7 @@ static int ohci_platform_resume(struct device *dev)
>  #endif /* CONFIG_PM */
>  
>  static const struct of_device_id ohci_platform_ids[] = {
> -	{ .compatible = "usb-ohci", },
> +	{ .compatible = "generic-ohci", },
>  	{ }
>  };
>  MODULE_DEVICE_TABLE(of, ohci_platform_ids);
> 
both v2 patches

Acked-by: Roger Quadros <rogerq-l0cyMroinI0@public.gmane.org>

[PATCH v2 2/2] ehci-platform: Change compatible string from usb-ehci to generic-ehci

[Hans de Goede]

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-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
 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);
-- 
1.8.5.3

Re: [PATCH v2 0/2] ohci-/ehci-platform: Change compatible string to generic-?hci

[Kevin Hilman]

Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> writes:

> Hi Greg,
>
> And here is v2 of my ohci-/ehci-platform fixes for the regression of USB
> support on various ARM boards I caused in linux-next.
>
> As expected some people still did not like the ?hci-platform compatible
> string I went for in v1, hence this v2. The good news is it seems everyone
> seems to be able to live with generic-?hci as compatible now, so it seems this
> issue is finally settled.
>
> Please add these 2 patches to your usb-next tree, as said in the cover-letter
> of v1, I'm fine with you squashing these into the first 2 patches of my
> original series, but if you want them separate to preserve history that is
> fine too.

I tested this series on top of next-20140211 on the OMAP platforms where
I noticed the regressions, and confirm it fixes the problem.

Tested-by: Kevin Hilman <khilman-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>

Kevin