diff options
| author | Vamsi Krishna Samavedam <vskrishn@codeaurora.org> | 2016-08-08 17:53:48 -0700 |
|---|---|---|
| committer | Vamsi Krishna Samavedam <vskrishn@codeaurora.org> | 2016-08-30 12:22:35 -0700 |
| commit | 299063819e84815164f8111cb33b45ce74942444 (patch) | |
| tree | b54ef51b634ba94b511f90c739fa686f550d3e84 /Documentation | |
| parent | ab26d098793adbf90b77d414663e34ac0c7315f6 (diff) | |
usb: phy: qusb: Set clamp_dig_n signal based on usb status
Analog and digital power rails connected to the phy can be turned
on/off in any order. This may result in random leakage in the phy
as it expects certain power rails to be on/off in certain order.
Avoid random leakage on qusb2 phy by
1. Disable pll when phy is suspended/disconnected.
2. Reset and assert clamp dig_n signal to put dp/dm lines in high
impedance state.
Change-Id: I1bafa7f824af8bbb3f67a71b81bf23b0a9c7164e
Signed-off-by: Vamsi Krishna Samavedam <vskrishn@codeaurora.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/devicetree/bindings/usb/msm-phy.txt | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/usb/msm-phy.txt b/Documentation/devicetree/bindings/usb/msm-phy.txt index dd9c13b4b5ff..bcb866a83412 100644 --- a/Documentation/devicetree/bindings/usb/msm-phy.txt +++ b/Documentation/devicetree/bindings/usb/msm-phy.txt @@ -185,6 +185,9 @@ Optional properties: via the QSCRATCH interface. "emu_phy_base" : phy base address used for programming emulation target phy. "ref_clk_addr" : ref_clk bcr address used for on/off ref_clk before reset. + "tcsr_clamp_dig_n" : To enable/disable digital clamp to the phy. When + de-asserted, it will prevent random leakage from qusb2 phy resulting from + out of sequence turn on/off of 1p8, 3p3 and DVDD regulators. - clocks: a list of phandles to the PHY clocks. Use as per Documentation/devicetree/bindings/clock/clock-bindings.txt - clock-names: Names of the clocks in 1-1 correspondence with the "clocks" |