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Date:   Tue, 12 Feb 2019 12:01:53 -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 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.

> 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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