[PATCH] phy: add inno-usb2-phy driver for hi3798cv200 SoC

[shawnguo@kernel.org (Shawn Guo)]

On Mon, Oct 23, 2017 at 05:32:09PM -0500, Rob Herring wrote:
> On Sun, Oct 15, 2017 at 10:49:18PM +0800, Shawn Guo wrote:
> > From: Pengcheng Li <lpc.li@hisilicon.com>
> > 
> > It adds inno-usb2-phy driver for hi3798cv200 SoC USB 2.0 support.  One
> > inno-usb2-phy device can support up to two PHY ports.  While there is
> > device level reference clock and power reset to be controlled, each PHY
> > port has its own utmi reset that needs to assert/de-assert as needed.
> > 
> > Hi3798cv200 needs to access PHY port0 register via particular peripheral
> > syscon controller register to control PHY, like turning on PHY clock.
> > 
> > Signed-off-by: Pengcheng Li <lpc.li@hisilicon.com>
> > Signed-off-by: Jiancheng Xue <xuejiancheng@hisilicon.com>
> > Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
> > ---
> >  .../devicetree/bindings/phy/phy-hisi-inno-usb2.txt |  31 +++
> >  drivers/phy/hisilicon/Kconfig                      |  10 +
> >  drivers/phy/hisilicon/Makefile                     |   1 +
> >  drivers/phy/hisilicon/phy-hisi-inno-usb2.c         | 223 +++++++++++++++++++++
> >  4 files changed, 265 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/phy/phy-hisi-inno-usb2.txt
> >  create mode 100644 drivers/phy/hisilicon/phy-hisi-inno-usb2.c
> > 
> > diff --git a/Documentation/devicetree/bindings/phy/phy-hisi-inno-usb2.txt b/Documentation/devicetree/bindings/phy/phy-hisi-inno-usb2.txt
> > new file mode 100644
> > index 000000000000..4ef7af24a703
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/phy/phy-hisi-inno-usb2.txt
> > @@ -0,0 +1,31 @@
> > +HiSilicon INNO USB2 PHY
> > +
> > +Required properties:
> > +- compatible: Should be one of the following strings:
> > +	"hisilicon,inno-usb2-phy",
> > +	"hisilicon,hi3798cv200-usb2-phy".
> > +- #phy-cells: Should be 1. The specifier is the index of the PHY port to
> > +  reference.
> > +- hisilicon,peripheral-syscon: The phandle of syscon used to control PHY,
> > +  followed by a integer cell which defines the syscon register offset used
> > +  to talk to PHY.
> 
> Same comments as combophy.

If we agree that having the phy being child node gets us obvious
benefits, I would be happy to change them all.

> > +- clocks: The phandle and clock specifier pair for reference clock utmi_refclk.
> 
> 'clk' part of the name is redundant.

Are you talking about the text utmi_refclk?  It's not something we put
into 'clock-names' property, but just a text to tell what the clock is.

Shawn

> > +- resets: The list of phandle and reset specifier pairs for each reset signal
> > +  in reset-names.
> > +- reset-names: Should contain "power_on", "utmi0" and "utmi1". The "utmi1"
> > +  should exist only if the device has two PHY port.