[PATCH] USB: ehci-platform: support EHCIs with transaction translator

[Alan Stern]

On Sat, 16 May 2015, Joachim Eastwood wrote:

> Some EHCI controllers have a Transaction Translator built into
> the root hub. Support this feature in device tree when using
> the ehci-platform driver by adding a feature flag for it.
> 
> This is needed to get USB working on NXP LPC18xx/43xx platforms.
> 
> Signed-off-by: Joachim Eastwood <manabian at gmail.com>
> ---
> 
>  Documentation/devicetree/bindings/usb/usb-ehci.txt | 2 ++
>  drivers/usb/host/ehci-platform.c                   | 4 ++++
>  2 files changed, 6 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/usb/usb-ehci.txt b/Documentation/devicetree/bindings/usb/usb-ehci.txt
> index 0b04fdff9d5a..a12d6012a40f 100644
> --- a/Documentation/devicetree/bindings/usb/usb-ehci.txt
> +++ b/Documentation/devicetree/bindings/usb/usb-ehci.txt
> @@ -13,6 +13,8 @@ Optional properties:
>   - big-endian-desc : boolean, set this for hcds with big-endian descriptors
>   - big-endian : boolean, for hcds with big-endian-regs + big-endian-desc
>   - needs-reset-on-resume : boolean, set this to force EHCI reset after resume
> + - has-transaction-translator : boolean, set this if EHCI have a Transaction
> +				Translator built into the root hub.
>   - clocks : a list of phandle + clock specifier pairs
>   - phys : phandle + phy specifier pair
>   - phy-names : "usb"
> diff --git a/drivers/usb/host/ehci-platform.c b/drivers/usb/host/ehci-platform.c
> index d8a75a51d6d4..ba07f16b13e0 100644
> --- a/drivers/usb/host/ehci-platform.c
> +++ b/drivers/usb/host/ehci-platform.c
> @@ -202,6 +202,10 @@ static int ehci_platform_probe(struct platform_device *dev)
>  					  "needs-reset-on-resume"))
>  			pdata->reset_on_resume = 1;
>  
> +		if (of_property_read_bool(dev->dev.of_node,
> +					  "has-transaction-translator"))
> +			pdata->has_tt = 1;
> +
>  		priv->num_phys = of_count_phandle_with_args(dev->dev.of_node,
>  				"phys", "#phy-cells");
>  		priv->num_phys = priv->num_phys > 0 ? priv->num_phys : 1;

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