diff mbox series

[4/5] dt-bindings: usb: dwc3: of-simple: add compatible for HiSi

Message ID 20190925234224.95216-5-john.stultz@linaro.org (mailing list archive)
State Superseded
Headers show
Series dwc3: Changes for HiKey960 support | expand

Commit Message

John Stultz Sept. 25, 2019, 11:42 p.m. UTC 
Add necessary compatible flag for HiSi's DWC3 so
dwc3-of-simple will probe.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Felipe Balbi <balbi@kernel.org>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Yu Chen <chenyu56@huawei.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Chunfeng Yun <chunfeng.yun@mediatek.com>
Cc: linux-usb@vger.kernel.org
Cc: devicetree@vger.kernel.org
Signed-off-by: John Stultz <john.stultz@linaro.org>
---
 .../devicetree/bindings/usb/hisi,dwc3.txt     | 52 +++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/usb/hisi,dwc3.txt

Comments

Chunfeng Yun Sept. 26, 2019, 1:34 a.m. UTC | #1 
On Wed, 2019-09-25 at 23:42 +0000, John Stultz wrote:
> Add necessary compatible flag for HiSi's DWC3 so
> dwc3-of-simple will probe.
> 
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Felipe Balbi <balbi@kernel.org>
> Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
> Cc: Rob Herring <robh+dt@kernel.org>
> Cc: Mark Rutland <mark.rutland@arm.com>
> Cc: Yu Chen <chenyu56@huawei.com>
> Cc: Matthias Brugger <matthias.bgg@gmail.com>
> Cc: Chunfeng Yun <chunfeng.yun@mediatek.com>
> Cc: linux-usb@vger.kernel.org
> Cc: devicetree@vger.kernel.org
> Signed-off-by: John Stultz <john.stultz@linaro.org>
> ---
>  .../devicetree/bindings/usb/hisi,dwc3.txt     | 52 +++++++++++++++++++
>  1 file changed, 52 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/usb/hisi,dwc3.txt
> 
> diff --git a/Documentation/devicetree/bindings/usb/hisi,dwc3.txt b/Documentation/devicetree/bindings/usb/hisi,dwc3.txt
> new file mode 100644
> index 000000000000..dc31b8a3c006
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/hisi,dwc3.txt
> @@ -0,0 +1,52 @@
> +HiSi SuperSpeed DWC3 USB SoC controller
> +
> +Required properties:
> +- compatible:		should contain "hisilicon,hi3660-dwc3" for HiSi SoC
> +- clocks:		A list of phandle + clock-specifier pairs for the
> +			clocks listed in clock-names
> +- clock-names:		Should contain the following:
> +  "clk_usb3phy_ref"	Phy reference clk
It's not good idea to apply phy's clock in dwc3's node

> +  "aclk_usb3otg"	USB3 OTG aclk
> +
> +- assigned-clocks:	Should be:
> +				HI3660_ACLK_GATE_USB3OTG
> +- assigned-clock-rates: Should be:
> +				229Mhz (229000000) for HI3660_ACLK_GATE_USB3OTG
> +
> +Optional properties:
> +- resets:		Phandle to reset control that resets core and wrapper.
> +
> +Required child node:
> +A child node must exist to represent the core DWC3 IP block. The name of
> +the node is not important. The content of the node is defined in dwc3.txt.
> +
> +Example device nodes:
> +
> +	usb3: hisi_dwc3 {
> +		compatible = "hisilicon,hi3660-dwc3";
> +		#address-cells = <2>;
> +		#size-cells = <2>;
> +		ranges;
> +
> +		clocks = <&crg_ctrl HI3660_CLK_ABB_USB>,
> +			 <&crg_ctrl HI3660_ACLK_GATE_USB3OTG>;
> +		clock-names = "clk_usb3phy_ref", "aclk_usb3otg";
> +
> +		assigned-clocks = <&crg_ctrl HI3660_ACLK_GATE_USB3OTG>;
> +		assigned-clock-rates = <229 000 000>;
> +		resets = <&crg_rst 0x90 8>,
> +			 <&crg_rst 0x90 7>,
> +			 <&crg_rst 0x90 6>,
> +			 <&crg_rst 0x90 5>;
> +
> +		dwc3: dwc3@ff100000 {
> +			compatible = "snps,dwc3";
> +			reg = <0x0 0xff100000 0x0 0x100000>;
> +			interrupts = <0 159 4>, <0 161 4>;
> +			phys = <&usb_phy>;
> +			phy-names = "usb3-phy";
> +			dr_mode = "otg";
> +
> +			...
> +		};
> +	};
John Stultz Sept. 26, 2019, 4:06 a.m. UTC | #2 
On Wed, Sep 25, 2019 at 6:34 PM Chunfeng Yun <chunfeng.yun@mediatek.com> wrote:
> On Wed, 2019-09-25 at 23:42 +0000, John Stultz wrote:
> > +++ b/Documentation/devicetree/bindings/usb/hisi,dwc3.txt
> > @@ -0,0 +1,52 @@
> > +HiSi SuperSpeed DWC3 USB SoC controller
> > +
> > +Required properties:
> > +- compatible:                should contain "hisilicon,hi3660-dwc3" for HiSi SoC
> > +- clocks:            A list of phandle + clock-specifier pairs for the
> > +                     clocks listed in clock-names
> > +- clock-names:               Should contain the following:
> > +  "clk_usb3phy_ref"  Phy reference clk
> It's not good idea to apply phy's clock in dwc3's node

Hey! Thanks for taking a look at this!

So first, my apologies, I'm not the driver author and I don't have any
real specs on the hardware other then what's in the source tree I'm
working on.  Not the ideal person to be documenting the binding, but I
realized we still needed some binding documentation (although a few
other dwc-of-simple compat entries are undocumented), so this is my
rough stab at it. :/

Given the name clk_usb3phy_ref I'm assuming its a phy reference clock,
but I honestly don't know if I'm getting that wrong.  It all seems to
be leveraging the fact that the dwc-of-simple driver batch enables and
disables all the clocks w/o really looking at the names.

Do you have a recommendation for what would be best here? I suspect
it's necessary to enable/disable the clk in a similar path(though I'm
unfortunately traveling this week so I can't validate that). Do I try
to move the clk_usb3phy_ref clock enable/disable handling to somewhere
else?

thanks
-john
Chunfeng Yun Sept. 26, 2019, 6:42 a.m. UTC | #3 
On Wed, 2019-09-25 at 21:06 -0700, John Stultz wrote:
> On Wed, Sep 25, 2019 at 6:34 PM Chunfeng Yun <chunfeng.yun@mediatek.com> wrote:
> > On Wed, 2019-09-25 at 23:42 +0000, John Stultz wrote:
> > > +++ b/Documentation/devicetree/bindings/usb/hisi,dwc3.txt
> > > @@ -0,0 +1,52 @@
> > > +HiSi SuperSpeed DWC3 USB SoC controller
> > > +
> > > +Required properties:
> > > +- compatible:                should contain "hisilicon,hi3660-dwc3" for HiSi SoC
> > > +- clocks:            A list of phandle + clock-specifier pairs for the
> > > +                     clocks listed in clock-names
> > > +- clock-names:               Should contain the following:
> > > +  "clk_usb3phy_ref"  Phy reference clk
> > It's not good idea to apply phy's clock in dwc3's node
> 
> Hey! Thanks for taking a look at this!
> 
> So first, my apologies, I'm not the driver author and I don't have any
> real specs on the hardware other then what's in the source tree I'm
> working on.  Not the ideal person to be documenting the binding, but I
> realized we still needed some binding documentation (although a few
> other dwc-of-simple compat entries are undocumented), so this is my
> rough stab at it. :/
> 
> Given the name clk_usb3phy_ref I'm assuming its a phy reference clock,
> but I honestly don't know if I'm getting that wrong.  It all seems to
> be leveraging the fact that the dwc-of-simple driver batch enables and
> disables all the clocks w/o really looking at the names.
> 
> Do you have a recommendation for what would be best here? I suspect
> it's necessary to enable/disable the clk in a similar path(though I'm
> unfortunately traveling this week so I can't validate that). Do I try
> to move the clk_usb3phy_ref clock enable/disable handling to somewhere
> else?
If it's phy clock, we should enable/disable it in phy driver, maybe we'd
better ask for help from Yu Chen

> 
> thanks
> -john
John Stultz Oct. 2, 2019, 8:45 p.m. UTC | #4 
On Wed, Sep 25, 2019 at 11:42 PM Chunfeng Yun <chunfeng.yun@mediatek.com> wrote:
> On Wed, 2019-09-25 at 21:06 -0700, John Stultz wrote:
> > On Wed, Sep 25, 2019 at 6:34 PM Chunfeng Yun <chunfeng.yun@mediatek.com> wrote:
> > > On Wed, 2019-09-25 at 23:42 +0000, John Stultz wrote:
> > > > +++ b/Documentation/devicetree/bindings/usb/hisi,dwc3.txt
> > > > @@ -0,0 +1,52 @@
> > > > +HiSi SuperSpeed DWC3 USB SoC controller
> > > > +
> > > > +Required properties:
> > > > +- compatible:                should contain "hisilicon,hi3660-dwc3" for HiSi SoC
> > > > +- clocks:            A list of phandle + clock-specifier pairs for the
> > > > +                     clocks listed in clock-names
> > > > +- clock-names:               Should contain the following:
> > > > +  "clk_usb3phy_ref"  Phy reference clk
> > > It's not good idea to apply phy's clock in dwc3's node
...
> > Given the name clk_usb3phy_ref I'm assuming its a phy reference clock,
> > but I honestly don't know if I'm getting that wrong.  It all seems to
> > be leveraging the fact that the dwc-of-simple driver batch enables and
> > disables all the clocks w/o really looking at the names.
> >
...
> If it's phy clock, we should enable/disable it in phy driver, maybe we'd
> better ask for help from Yu Chen

So I've been looking around the existing code and I'm not sure how we
got to clk_usb3phy_ref here.

Really it is the HI3660_CLK_ABB_USB, who's name is "clk_abb_usb" and
who's parent is "clk_gate_usb_tcxo_en"

So I'm thinking just specifying clk_abb_usb is more accurate here?

Does that sound reasonable?

thanks
-john
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/usb/hisi,dwc3.txt b/Documentation/devicetree/bindings/usb/hisi,dwc3.txt
new file mode 100644
index 000000000000..dc31b8a3c006
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/hisi,dwc3.txt
@@ -0,0 +1,52 @@ 
+HiSi SuperSpeed DWC3 USB SoC controller
+
+Required properties:
+- compatible:		should contain "hisilicon,hi3660-dwc3" for HiSi SoC
+- clocks:		A list of phandle + clock-specifier pairs for the
+			clocks listed in clock-names
+- clock-names:		Should contain the following:
+  "clk_usb3phy_ref"	Phy reference clk
+  "aclk_usb3otg"	USB3 OTG aclk
+
+- assigned-clocks:	Should be:
+				HI3660_ACLK_GATE_USB3OTG
+- assigned-clock-rates: Should be:
+				229Mhz (229000000) for HI3660_ACLK_GATE_USB3OTG
+
+Optional properties:
+- resets:		Phandle to reset control that resets core and wrapper.
+
+Required child node:
+A child node must exist to represent the core DWC3 IP block. The name of
+the node is not important. The content of the node is defined in dwc3.txt.
+
+Example device nodes:
+
+	usb3: hisi_dwc3 {
+		compatible = "hisilicon,hi3660-dwc3";
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+
+		clocks = <&crg_ctrl HI3660_CLK_ABB_USB>,
+			 <&crg_ctrl HI3660_ACLK_GATE_USB3OTG>;
+		clock-names = "clk_usb3phy_ref", "aclk_usb3otg";
+
+		assigned-clocks = <&crg_ctrl HI3660_ACLK_GATE_USB3OTG>;
+		assigned-clock-rates = <229 000 000>;
+		resets = <&crg_rst 0x90 8>,
+			 <&crg_rst 0x90 7>,
+			 <&crg_rst 0x90 6>,
+			 <&crg_rst 0x90 5>;
+
+		dwc3: dwc3@ff100000 {
+			compatible = "snps,dwc3";
+			reg = <0x0 0xff100000 0x0 0x100000>;
+			interrupts = <0 159 4>, <0 161 4>;
+			phys = <&usb_phy>;
+			phy-names = "usb3-phy";
+			dr_mode = "otg";
+
+			...
+		};
+	};