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

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@redhat.com>
---
 Documentation/devicetree/bindings/usb/usb-ohci.txt | 4 ++--
 drivers/usb/host/ohci-platform.c                   | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

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@redhat.com>

For both v2 patches:

Acked-by: Alan Stern <stern@rowland.harvard.edu>

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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@redhat.com>
> ---
>  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@ti.com>
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