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Commit 40f2f2a3 authored May 16, 2015 by Joachim Eastwood Committed by Greg Kroah-Hartman May 24, 2015

USB: ehci-platform: support EHCIs with transaction translator



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@gmail.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent ca07e1c1

Documentation/devicetree/bindings/usb/usb-ehci.txt

+2 −0

Original line number	Diff line number	Diff line
		@@ -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"

drivers/usb/host/ehci-platform.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -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;