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authorLee Jones <lee.jones@linaro.org>2019-06-17 13:51:04 +0100
committerFelipe Balbi <felipe.balbi@linux.intel.com>2019-06-18 11:58:29 +0300
commita6e456209d088df31eacfa877d40194c755ca153 (patch)
tree6b941b3f07bb02e208d2fcd7d5331c9902a54607 /drivers/usb/dwc3
parent2bc02355f8ba2c1f108ec8b16a673b467a17228c (diff)
downloadlinux-a6e456209d088df31eacfa877d40194c755ca153.tar.bz2
usb: dwc3: qcom: Start USB in 'host mode' on the SDM845
When booting with Device Tree, the current default boot configuration table option, the request to boot via 'host mode' comes from the 'dr_mode' property. A property of the same name can be used inside ACPI tables too. However it is missing from the SDM845's ACPI tables so we have to supply this information using Platform Device Properties instead. This does not change the behaviour of any currently supported devices. The property is only set on ACPI enabled platforms, thus for H/W booting DT, unless a 'dr_mode' property is present, the default is still OTG (On-The-Go) as per [0]. Any new ACPI devices added will also be able to over-ride this implementation by providing a 'dr_mode' property in their ACPI tables. In cases where 'dr_mode' is omitted from the tables AND 'host mode' should not be the default (very unlikely), then we will have to add some way of choosing between them at run time - most likely by ACPI HID. [0] Documentation/devicetree/bindings/usb/generic.txt Signed-off-by: Lee Jones <lee.jones@linaro.org> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Diffstat (limited to 'drivers/usb/dwc3')
-rw-r--r--drivers/usb/dwc3/dwc3-qcom.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
index 0cb63f6c92d9..2d050303d564 100644
--- a/drivers/usb/dwc3/dwc3-qcom.c
+++ b/drivers/usb/dwc3/dwc3-qcom.c
@@ -444,6 +444,11 @@ static int dwc3_qcom_clk_init(struct dwc3_qcom *qcom, int count)
return 0;
}
+static const struct property_entry dwc3_qcom_acpi_properties[] = {
+ PROPERTY_ENTRY_STRING("dr_mode", "host"),
+ {}
+};
+
static int dwc3_qcom_acpi_register_core(struct platform_device *pdev)
{
struct dwc3_qcom *qcom = platform_get_drvdata(pdev);
@@ -488,6 +493,13 @@ static int dwc3_qcom_acpi_register_core(struct platform_device *pdev)
goto out;
}
+ ret = platform_device_add_properties(qcom->dwc3,
+ dwc3_qcom_acpi_properties);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "failed to add properties\n");
+ goto out;
+ }
+
ret = platform_device_add(qcom->dwc3);
if (ret)
dev_err(&pdev->dev, "failed to add device\n");