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Date: Thu, 14 Feb 2019 16:32:47 -0600
From: Li Yang <leoyang.li@....com>
To: Pankaj Bansal <pankaj.bansal@....com>,
Rob Herring <robh+dt@...nel.org>
Cc: Shawn Guo <shawnguo@...nel.org>, Andrew Lunn <andrew@...n.ch>,
Florian Fainelli <f.fainelli@...il.com>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3] arm64: dts: lx2160aqds: Add mdio mux nodes
On Tue, Feb 12, 2019 at 12:01 PM Li Yang <leoyang.li@....com> wrote:
>
> On Mon, Feb 11, 2019 at 9:28 PM Pankaj Bansal <pankaj.bansal@....com> wrote:
> >
> >
> >
> > > -----Original Message-----
> > > From: Leo Li
> > > Sent: Tuesday, 12 February, 2019 02:14 AM
> > > To: Shawn Guo <shawnguo@...nel.org>; Pankaj Bansal
> > > <pankaj.bansal@....com>
> > > Cc: Andrew Lunn <andrew@...n.ch>; Florian Fainelli <f.fainelli@...il.com>;
> > > netdev@...r.kernel.org; linux-arm-kernel@...ts.infradead.org
> > > Subject: RE: [PATCH v3] arm64: dts: lx2160aqds: Add mdio mux nodes
> > >
> > >
> > >
> > > > -----Original Message-----
> > > > From: Shawn Guo <shawnguo@...nel.org>
> > > > Sent: Sunday, February 10, 2019 9:00 PM
> > > > To: Pankaj Bansal <pankaj.bansal@....com>
> > > > Cc: Leo Li <leoyang.li@....com>; Andrew Lunn <andrew@...n.ch>; Florian
> > > > Fainelli <f.fainelli@...il.com>; netdev@...r.kernel.org; linux-arm-
> > > > kernel@...ts.infradead.org
> > > > Subject: Re: [PATCH v3] arm64: dts: lx2160aqds: Add mdio mux nodes
> > > >
> > > > On Wed, Feb 06, 2019 at 09:40:33AM +0000, Pankaj Bansal wrote:
> > > > > The two external MDIO buses used to communicate with phy devices
> > > > > that are external to SOC are muxed in LX2160AQDS board.
> > > > >
> > > > > These buses can be routed to any one of the eight IO slots on
> > > > > LX2160AQDS board depending on value in fpga register 0x54.
> > > > >
> > > > > Additionally the external MDIO1 is used to communicate to the
> > > > > onboard RGMII phy devices.
> > > > >
> > > > > The mdio1 is controlled by bits 4-7 of fpga register and mdio2 is
> > > > > controlled by bits 0-3 of fpga register.
> > > > >
> > > > > Signed-off-by: Pankaj Bansal <pankaj.bansal@....com>
> > > > > ---
> > > > >
> > > > > Notes:
> > > > > V3:
> > > > > - Add status = disabled in soc file and status = okay in board file
> > > > > for external MDIO nodes
> > > > > - Add interrupts property in external mdio nodes in soc file
> > > > > V2:
> > > > > - removed unnecassary TODO statements
> > > > > - removed device_type from mdio nodes
> > > > > - change the case of hex number to lowercase
> > > > > - removed board specific comments from soc file
> > > > >
> > > > > .../boot/dts/freescale/fsl-lx2160a-qds.dts | 123 +++++++++++++++++
> > > > > .../boot/dts/freescale/fsl-lx2160a.dtsi | 22 +++
> > > > > 2 files changed, 145 insertions(+)
> > > > >
> > > > > diff --git a/arch/arm64/boot/dts/freescale/fsl-lx2160a-qds.dts
> > > > > b/arch/arm64/boot/dts/freescale/fsl-lx2160a-qds.dts
> > > > > index 99a22abbe725..079264b391a2 100644
> > > > > --- a/arch/arm64/boot/dts/freescale/fsl-lx2160a-qds.dts
> > > > > +++ b/arch/arm64/boot/dts/freescale/fsl-lx2160a-qds.dts
> > > > > @@ -35,6 +35,14 @@
> > > > > status = "okay";
> > > > > };
> > > > >
> > > > > +&emdio1 {
> > > > > + status = "okay";
> > > > > +};
> > > > > +
> > > > > +&emdio2 {
> > > > > + status = "okay";
> > > > > +};
> > > > > +
> > > > > &esdhc0 {
> > > > > status = "okay";
> > > > > };
> > > > > @@ -46,6 +54,121 @@
> > > > > &i2c0 {
> > > > > status = "okay";
> > > > >
> > > > > + fpga@66 {
> > > > > + compatible = "fsl,lx2160aqds-fpga", "fsl,fpga-qixis-i2c";
> > > > > + reg = <0x66>;
> > > > > + #address-cells = <1>;
> > > > > + #size-cells = <0>;
> > > > > +
> > > > > + mdio-mux-1@54 {
> > > > > + mdio-parent-bus = <&emdio1>;
> > > > > + reg = <0x54>; /* BRDCFG4 */
> > > > > + mux-mask = <0xf8>; /* EMI1_MDIO */
> > > > > + #address-cells=<1>;
> > > > > + #size-cells = <0>;
> > > > > +
> > > > > + mdio@0 {
> > > > > + reg = <0x00>;
> > > > > + #address-cells = <1>;
> > > > > + #size-cells = <0>;
> > > > > + };
> > > >
> > > > Please have a newline between nodes. It doesn't deserve a respin
> > > > though. I can fix them up when applying if Leo is fine with this version.
> > >
> > > I think there should be a compatible string defined for the binding of parent
> > > node mdio-mux, probably "mdio-mux-regmap", and be used here in the device
> > > tree.
> >
> > I have two concerns :
> > 1. The regmap is linux s/w construct, while device tree is h/w representation and is s/w agnostic. can we use regmap in device tree?
>
> Well, if we want to avoid using the regmap name, we probably can try
> "mdio-mux-reg" or "mdio-mux-syscon"? With further search I also found
> a more generic mux binding at Documentation/devicetree/bindings/mux/,
> would be even better if we can use that to describe the mux.
To make it more clear, with the use of
Documentation/devicetree/bindings/mux/ binding, I think it would end
up with something like this:
i2c {
fpga {
compatible = "fsl,lx2160aqds-fpga", "syscon";
....
mux: mux-controller {
compatible = "mmio-mux"
...
}
}
...
}
mdio-mux {
compatible = "mdio-mux"
mux-controls = <&mux 0>;
....
mdio {
phy {
}
...
}
mdio {
...
}
...
}
}"
>
> > 2. By convention the device tree compatible binding is defined as "<manufacturer>,<model>" e.g. "fsl,mpc8349-uart". The mdio-mux node and it's sub nodes are a generic representation of mdio mux and it is not dependent on a particular manufacturer device. How to define the compatible in this case?
>
> The manufacturer prefix is for vendor specific bindings. If the
> binding a suppose to be generic, we don't need the vendor prefix.
>
> >
> > >
> > > >
> > > > Shawn
> > > >
> > > > > + mdio@40 {
> > > > > + reg = <0x40>;
> > > > > + #address-cells = <1>;
> > > > > + #size-cells = <0>;
> > > > > + };
> > > > > + mdio@c0 {
> > > > > + reg = <0xc0>;
> > > > > + #address-cells = <1>;
> > > > > + #size-cells = <0>;
> > > > > + };
> > > > > + mdio@c8 {
> > > > > + reg = <0xc8>;
> > > > > + #address-cells = <1>;
> > > > > + #size-cells = <0>;
> > > > > + };
> > > > > + mdio@d0 {
> > > > > + reg = <0xd0>;
> > > > > + #address-cells = <1>;
> > > > > + #size-cells = <0>;
> > > > > + };
> > > > > + mdio@d8 {
> > > > > + reg = <0xd8>;
> > > > > + #address-cells = <1>;
> > > > > + #size-cells = <0>;
> > > > > + };
> > > > > + mdio@e0 {
> > > > > + reg = <0xe0>;
> > > > > + #address-cells = <1>;
> > > > > + #size-cells = <0>;
> > > > > + };
> > > > > + mdio@e8 {
> > > > > + reg = <0xe8>;
> > > > > + #address-cells = <1>;
> > > > > + #size-cells = <0>;
> > > > > + };
> > > > > + mdio@f0 {
> > > > > + reg = <0xf0>;
> > > > > + #address-cells = <1>;
> > > > > + #size-cells = <0>;
> > > > > + };
> > > > > + mdio@f8 {
> > > > > + reg = <0xf8>;
> > > > > + #address-cells = <1>;
> > > > > + #size-cells = <0>;
> > > > > + };
> > > > > + };
> > > > > +
> > > > > + mdio-mux-2@54 {
> > > > > + mdio-parent-bus = <&emdio2>;
> > > > > + reg = <0x54>; /* BRDCFG4 */
> > > > > + mux-mask = <0x07>; /* EMI2_MDIO */
> > > > > + #address-cells=<1>;
> > > > > + #size-cells = <0>;
> > > > > +
> > > > > + mdio@0 {
> > > > > + reg = <0x00>;
> > > > > + #address-cells = <1>;
> > > > > + #size-cells = <0>;
> > > > > + };
> > > > > + mdio@1 {
> > > > > + reg = <0x01>;
> > > > > + #address-cells = <1>;
> > > > > + #size-cells = <0>;
> > > > > + };
> > > > > + mdio@2 {
> > > > > + reg = <0x02>;
> > > > > + #address-cells = <1>;
> > > > > + #size-cells = <0>;
> > > > > + };
> > > > > + mdio@3 {
> > > > > + reg = <0x03>;
> > > > > + #address-cells = <1>;
> > > > > + #size-cells = <0>;
> > > > > + };
> > > > > + mdio@4 {
> > > > > + reg = <0x04>;
> > > > > + #address-cells = <1>;
> > > > > + #size-cells = <0>;
> > > > > + };
> > > > > + mdio@5 {
> > > > > + reg = <0x05>;
> > > > > + #address-cells = <1>;
> > > > > + #size-cells = <0>;
> > > > > + };
> > > > > + mdio@6 {
> > > > > + reg = <0x06>;
> > > > > + #address-cells = <1>;
> > > > > + #size-cells = <0>;
> > > > > + };
> > > > > + mdio@7 {
> > > > > + reg = <0x07>;
> > > > > + #address-cells = <1>;
> > > > > + #size-cells = <0>;
> > > > > + };
> > > > > + };
> > > > > + };
> > > > > +
> > > > > i2c-mux@77 {
> > > > > compatible = "nxp,pca9547";
> > > > > reg = <0x77>;
> > > > > diff --git a/arch/arm64/boot/dts/freescale/fsl-lx2160a.dtsi
> > > > > b/arch/arm64/boot/dts/freescale/fsl-lx2160a.dtsi
> > > > > index a79f5c1ea56d..7def5252ac1a 100644
> > > > > --- a/arch/arm64/boot/dts/freescale/fsl-lx2160a.dtsi
> > > > > +++ b/arch/arm64/boot/dts/freescale/fsl-lx2160a.dtsi
> > > > > @@ -762,5 +762,27 @@
> > > > > <GIC_SPI 209 IRQ_TYPE_LEVEL_HIGH>;
> > > > > dma-coherent;
> > > > > };
> > > > > +
> > > > > + /* WRIOP0: 0x8b8_0000, E-MDIO1: 0x1_6000 */
> > > > > + emdio1: mdio@...6000 {
> > > > > + compatible = "fsl,fman-memac-mdio";
> > > > > + reg = <0x0 0x8b96000 0x0 0x1000>;
> > > > > + interrupts = <GIC_SPI 90 IRQ_TYPE_LEVEL_HIGH>;
> > > > > + #address-cells = <1>;
> > > > > + #size-cells = <0>;
> > > > > + little-endian; /* force the driver in LE mode */
> > > > > + status = "disabled";
> > > > > + };
> > > > > +
> > > > > + /* WRIOP0: 0x8b8_0000, E-MDIO2: 0x1_7000 */
> > > > > + emdio2: mdio@...7000 {
> > > > > + compatible = "fsl,fman-memac-mdio";
> > > > > + reg = <0x0 0x8b97000 0x0 0x1000>;
> > > > > + interrupts = <GIC_SPI 91 IRQ_TYPE_LEVEL_HIGH>;
> > > > > + #address-cells = <1>;
> > > > > + #size-cells = <0>;
> > > > > + little-endian; /* force the driver in LE mode */
> > > > > + status = "disabled";
> > > > > + };
> > > > > };
> > > > > };
> > > > > --
> > > > > 2.17.1
> > > > >
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