Hi Felipe,
On Thu, May 30, 2013 at 03:31:21PM -0500, Ruchika Kharwar wrote:
> This patch adds an optional parameter "dr_mode" to the dwc3 core device node.
> In the case the compile flag for the DWC3 controller is set to
> "USB_DWC3_DUAL_ROLE" a device tree could restrain to either functionality of
> host or gadget. In the case the device tree does not use this optional flag or
> specifies it superfluously to "drd" the functionality will be that
> of a dual role device.
>
> Signed-off-by: Ruchika Kharwar <ruchika@xxxxxx>
> ---
> Documentation/devicetree/bindings/usb/dwc3.txt | 3 ++-
> drivers/usb/dwc3/core.c | 20 +++++++++++++++++---
> 2 files changed, 19 insertions(+), 4 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt b/Documentation/devicetree/bindings/usb/dwc3.txt
> index 7a95c65..2f5d584 100644
> --- a/Documentation/devicetree/bindings/usb/dwc3.txt
> +++ b/Documentation/devicetree/bindings/usb/dwc3.txt
> @@ -10,7 +10,8 @@ Required properties:
>
> Optional properties:
> - tx-fifo-resize: determines if the FIFO *has* to be reallocated.
> -
> + - dr_mode: determines the mode of core. Supported modes are "gadget", "host"
> + and "drd".
> This is usually a subnode to DWC3 glue to which it is connected.
>
> dwc3@4a030000 {
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index c35d49d..05c0c8b 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -378,6 +378,7 @@ static int dwc3_probe(struct platform_device *pdev)
> void *mem;
>
> u8 mode;
> + char *dr_mode;
>
> mem = devm_kzalloc(dev, sizeof(*dwc) + DWC3_ALIGN_MASK, GFP_KERNEL);
> if (!mem) {
> @@ -520,9 +521,22 @@ static int dwc3_probe(struct platform_device *pdev)
> mode = DWC3_MODE_HOST;
> else if (IS_ENABLED(CONFIG_USB_DWC3_GADGET))
> mode = DWC3_MODE_DEVICE;
> - else
> - mode = DWC3_MODE_DRD;
> -
> + else {
> + if (of_property_read_string(node, "dr_mode", &dr_mode))
> + mode = DWC3_MODE_DRD;
> + else {
> + if (strcmp(dr_mode, "host") == 0)
> + mode = DWC3_MODE_HOST;
> + else if (strcmp(dr_mode, "gadget") == 0)
> + mode = DWC3_MODE_DEVICE;
> + else if (strcmp(dr_mode, "drd") == 0)
> + mode = DWC3_MODE_DRD;
> + else {
> + dev_err(dev, "invalid dr_mode property value\n");
> + goto err2;
> + }
> + }
> + }
> switch (mode) {
> case DWC3_MODE_DEVICE:
> dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_DEVICE);
> --
> 1.7.5.4
this is more likely to be solved with a common property description for
the gadget layer. We have some prepared parts in the latest patch series:
[PATCH 1/7] USB: add devicetree helpers for determining dr_mode and phy_type
http://www.spinics.net/lists/linux-usb/msg86829.html
What do you think?
Thanks,
Michael
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