[PATCH v3 1/4] doc: dt-binding: ci-hdrc-usb2: add property for samsung picophy
Peter Chen
peter.chen at nxp.com
Fri Jul 24 02:05:29 EDT 2020
Add two parameters which are used to tune USB signal for samsung picophy,
which is used at imx7d, imx8mm, and imx8mn.
Reviewed-by: Jun Li <jun.li at nxp.com>
Signed-off-by: Peter Chen <peter.chen at nxp.com>
---
Changes for v3:
- Changing propery name to indicate it is a samsung phy
- Add property range and default value.
Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt b/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
index 51376cbe5f3d..a5c5db6a0b2d 100644
--- a/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
+++ b/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
@@ -100,6 +100,15 @@ i.mx specific properties
It's recommended to specify the over current polarity.
- power-active-high: power signal polarity is active high
- external-vbus-divider: enables off-chip resistor divider for Vbus
+- samsung,picophy-pre-emp-curr-control: HS Transmitter Pre-Emphasis Current
+ Control. This signal controls the amount of current sourced to the
+ USB_OTG*_DP and USB_OTG*_DN pins after a J-to-K or K-to-J transition.
+ The range is from 0x0 to 0x3, the default value is 0x1.
+ Details can refer to TXPREEMPAMPTUNE0 bits of USBNC_n_PHY_CFG1.
+- samsung,picophy-dc-vol-level-adjust: HS DC Voltage Level Adjustment.
+ Adjust the high-speed transmitter DC level voltage.
+ The range is from 0x0 to 0xf, the default value is 0x3.
+ Details can refer to TXVREFTUNE0 bits of USBNC_n_PHY_CFG1.
Example:
--
2.17.1
More information about the linux-arm-kernel
mailing list