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Date: Tue, 14 Nov 2023 17:42:16 +0000
From: Daniel Golle <daniel@...rotopia.org>
To: Rob Herring <robh@...nel.org>
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Chunfeng Yun <chunfeng.yun@...iatek.com>,
	Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Felix Fietkau <nbd@....name>, John Crispin <john@...ozen.org>,
	Sean Wang <sean.wang@...iatek.com>,
	Mark Lee <Mark-MC.Lee@...iatek.com>,
	Lorenzo Bianconi <lorenzo@...nel.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	Alexander Couzens <lynxis@...0.eu>,
	Philipp Zabel <p.zabel@...gutronix.de>, netdev@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org, linux-phy@...ts.infradead.org
Subject: Re: [RFC PATCH 7/8] dt-bindings: net: mediatek,net: fix and complete
 mt7988-eth binding

Hi Rob,

thank you for reviewing this patch.

On Tue, Nov 14, 2023 at 08:07:19AM -0600, Rob Herring wrote:
> On Thu, Nov 09, 2023 at 09:52:09PM +0000, Daniel Golle wrote:
> > Remove clocks which were copied from the vendor driver but are now taken
> > care of by dedicated drivers for PCS and PHY in the upstream driver.
> > Also remove mediatek,sgmiisys phandle which isn't required on MT7988
> > because we use pcs-handle on the MAC nodes instead.
> > Last but not least, add an example for MT7988.
> 
> 'Also' is a clue for it should be a separate patch. These changes are 
> all ABI breakage. Please explain why that's okay.

I hope that it's ok because the driver at this point never supported
any SerDes modes and we are still in the process of bringing up
mainline support for this SoC. All of clk, pinctrl, reset, ... driver
and dt-bindings are still pending or being prepared for submission.

> 
> > 
> > Fixes: c94a9aabec36 ("dt-bindings: net: mediatek,net: add mt7988-eth binding")
> > Signed-off-by: Daniel Golle <daniel@...rotopia.org>
> > ---
> >  .../devicetree/bindings/net/mediatek,net.yaml | 171 +++++++++++++++---
> >  1 file changed, 142 insertions(+), 29 deletions(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/net/mediatek,net.yaml b/Documentation/devicetree/bindings/net/mediatek,net.yaml
> > index e74502a0afe86..c0f7bb6f3ef8d 100644
> > --- a/Documentation/devicetree/bindings/net/mediatek,net.yaml
> > +++ b/Documentation/devicetree/bindings/net/mediatek,net.yaml
> > @@ -27,9 +27,6 @@ properties:
> >        - mediatek,mt7988-eth
> >        - ralink,rt5350-eth
> >  
> > -  reg:
> > -    maxItems: 1
> > -
> 
> It's not clear what this change is from the commit msg.
> 
> This should stay and be:
> 
> reg:
>   minItems: 1
>   items:
>     - description: what's in the 1st region
>     - description: what's in the 2nd region

Ack.

> 
> >    clocks: true
> >    clock-names: true
> >  
> > @@ -115,6 +112,9 @@ allOf:
> >                - mediatek,mt7623-eth
> >      then:
> >        properties:
> > +        reg:
> > +          maxItems: 1
> > +
> >          interrupts:
> >            maxItems: 3
> >  
> > @@ -149,6 +149,9 @@ allOf:
> >                - mediatek,mt7621-eth
> >      then:
> >        properties:
> > +        reg:
> > +          maxItems: 1
> > +
> >          interrupts:
> >            maxItems: 1
> >  
> > @@ -174,6 +177,9 @@ allOf:
> >              const: mediatek,mt7622-eth
> >      then:
> >        properties:
> > +        reg:
> > +          maxItems: 1
> > +
> >          interrupts:
> >            maxItems: 3
> >  
> > @@ -215,6 +221,9 @@ allOf:
> >              const: mediatek,mt7629-eth
> >      then:
> >        properties:
> > +        reg:
> > +          maxItems: 1
> > +
> >          interrupts:
> >            maxItems: 3
> >  
> > @@ -257,6 +266,9 @@ allOf:
> >              const: mediatek,mt7981-eth
> >      then:
> >        properties:
> > +        reg:
> > +          maxItems: 1
> > +
> >          interrupts:
> >            minItems: 4
> >  
> > @@ -295,6 +307,9 @@ allOf:
> >              const: mediatek,mt7986-eth
> >      then:
> >        properties:
> > +        reg:
> > +          maxItems: 1
> > +
> 
> Looks like lots of duplication. Perhaps there's a cleaner way.

Hm, I don't really see any better way. Suggestions anyone?

> 
> >          interrupts:
> >            minItems: 4
> >  
> > @@ -333,36 +348,32 @@ allOf:
> >              const: mediatek,mt7988-eth
> >      then:
> >        properties:
> > +        reg:
> > +          maxItems: 2
> > +          minItems: 2
> > +
> >          interrupts:
> >            minItems: 4
> > +          maxItems: 4
> >  
> >          clocks:
> > -          minItems: 34
> > -          maxItems: 34
> > +          minItems: 24
> > +          maxItems: 24
> >  
> >          clock-names:
> >            items:
> > -            - const: crypto
> > +            - const: xgp1
> > +            - const: xgp2
> > +            - const: xgp3
> >              - const: fe
> >              - const: gp2
> >              - const: gp1
> >              - const: gp3
> > +            - const: esw
> > +            - const: crypto
> >              - const: ethwarp_wocpu2
> >              - const: ethwarp_wocpu1
> >              - const: ethwarp_wocpu0
> > -            - const: esw
> > -            - const: netsys0
> > -            - const: netsys1
> > -            - const: sgmii_tx250m
> > -            - const: sgmii_rx250m
> > -            - const: sgmii2_tx250m
> > -            - const: sgmii2_rx250m
> > -            - const: top_usxgmii0_sel
> > -            - const: top_usxgmii1_sel
> > -            - const: top_sgm0_sel
> > -            - const: top_sgm1_sel
> > -            - const: top_xfi_phy0_xtal_sel
> > -            - const: top_xfi_phy1_xtal_sel
> >              - const: top_eth_gmii_sel
> >              - const: top_eth_refck_50m_sel
> >              - const: top_eth_sys_200m_sel
> > @@ -375,18 +386,9 @@ allOf:
> >              - const: top_netsys_sync_250m_sel
> >              - const: top_netsys_ppefb_250m_sel
> >              - const: top_netsys_warp_sel
> > -            - const: wocpu1
> > -            - const: wocpu0
> > -            - const: xgp1
> > -            - const: xgp2
> > -            - const: xgp3
> > -
> > -        mediatek,sgmiisys:
> > -          minItems: 2
> > -          maxItems: 2
> >  
> >  patternProperties:
> > -  "^mac@[0-1]$":
> > +  "^mac@[0-2]$":
> >      type: object
> >      unevaluatedProperties: false
> >      allOf:
> > @@ -577,3 +579,114 @@ examples:
> >          };
> >        };
> >      };
> > +
> > +  - |
> > +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> > +    #include <dt-bindings/interrupt-controller/irq.h>
> > +    #include <dt-bindings/clock/mediatek,mt7988-clk.h>
> > +
> > +    soc {
> > +      #address-cells = <2>;
> > +      #size-cells = <2>;
> > +
> > +      ethernet@...00000 {
> > +        compatible = "mediatek,mt7988-eth";
> > +        reg = <0 0x15100000 0 0x80000>, <0 0x15400000 0 0x380000>;
> > +        interrupts = <GIC_SPI 196 IRQ_TYPE_LEVEL_HIGH>,
> > +                     <GIC_SPI 197 IRQ_TYPE_LEVEL_HIGH>,
> > +                     <GIC_SPI 198 IRQ_TYPE_LEVEL_HIGH>,
> > +                     <GIC_SPI 199 IRQ_TYPE_LEVEL_HIGH>;
> > +
> > +        clocks = <&ethsys CLK_ETHDMA_XGP1_EN>,
> > +                 <&ethsys CLK_ETHDMA_XGP2_EN>,
> > +                 <&ethsys CLK_ETHDMA_XGP3_EN>,
> > +                 <&ethsys CLK_ETHDMA_FE_EN>,
> > +                 <&ethsys CLK_ETHDMA_GP2_EN>,
> > +                 <&ethsys CLK_ETHDMA_GP1_EN>,
> > +                 <&ethsys CLK_ETHDMA_GP3_EN>,
> > +                 <&ethsys CLK_ETHDMA_ESW_EN>,
> > +                 <&ethsys CLK_ETHDMA_CRYPT0_EN>,
> > +                 <&ethwarp CLK_ETHWARP_WOCPU2_EN>,
> > +                 <&ethwarp CLK_ETHWARP_WOCPU1_EN>,
> > +                 <&ethwarp CLK_ETHWARP_WOCPU0_EN>,
> > +                 <&topckgen CLK_TOP_ETH_GMII_SEL>,
> > +                 <&topckgen CLK_TOP_ETH_REFCK_50M_SEL>,
> > +                 <&topckgen CLK_TOP_ETH_SYS_200M_SEL>,
> > +                 <&topckgen CLK_TOP_ETH_SYS_SEL>,
> > +                 <&topckgen CLK_TOP_ETH_XGMII_SEL>,
> > +                 <&topckgen CLK_TOP_ETH_MII_SEL>,
> > +                 <&topckgen CLK_TOP_NETSYS_SEL>,
> > +                 <&topckgen CLK_TOP_NETSYS_500M_SEL>,
> > +                 <&topckgen CLK_TOP_NETSYS_PAO_2X_SEL>,
> > +                 <&topckgen CLK_TOP_NETSYS_SYNC_250M_SEL>,
> > +                 <&topckgen CLK_TOP_NETSYS_PPEFB_250M_SEL>,
> > +                 <&topckgen CLK_TOP_NETSYS_WARP_SEL>;
> > +
> > +        clock-names = "xgp1", "xgp2", "xgp3", "fe", "gp2", "gp1",
> > +                      "gp3", "esw", "crypto",
> > +                      "ethwarp_wocpu2", "ethwarp_wocpu1",
> > +                      "ethwarp_wocpu0", "top_eth_gmii_sel",
> > +                      "top_eth_refck_50m_sel", "top_eth_sys_200m_sel",
> > +                      "top_eth_sys_sel", "top_eth_xgmii_sel",
> > +                      "top_eth_mii_sel", "top_netsys_sel",
> > +                      "top_netsys_500m_sel", "top_netsys_pao_2x_sel",
> > +                      "top_netsys_sync_250m_sel",
> > +                      "top_netsys_ppefb_250m_sel",
> > +                      "top_netsys_warp_sel";
> > +        assigned-clocks = <&topckgen CLK_TOP_NETSYS_2X_SEL>,
> > +                          <&topckgen CLK_TOP_NETSYS_GSW_SEL>,
> > +                          <&topckgen CLK_TOP_USXGMII_SBUS_0_SEL>,
> > +                          <&topckgen CLK_TOP_USXGMII_SBUS_1_SEL>,
> > +                          <&topckgen CLK_TOP_SGM_0_SEL>,
> > +                          <&topckgen CLK_TOP_SGM_1_SEL>;
> > +        assigned-clock-parents = <&apmixedsys CLK_APMIXED_NET2PLL>,
> > +                                 <&topckgen CLK_TOP_NET1PLL_D4>,
> > +                                 <&topckgen CLK_TOP_NET1PLL_D8_D4>,
> > +                                 <&topckgen CLK_TOP_NET1PLL_D8_D4>,
> > +                                 <&apmixedsys CLK_APMIXED_SGMPLL>,
> > +                                 <&apmixedsys CLK_APMIXED_SGMPLL>;
> > +        mediatek,ethsys = <&ethsys>;
> > +        mediatek,infracfg = <&topmisc>;
> > +        #address-cells = <1>;
> > +        #size-cells = <0>;
> > +
> > +        mac@0 {
> > +          compatible = "mediatek,eth-mac";
> > +          reg = <0>;
> > +          phy-mode = "internal";
> > +          status = "disabled";
> 
> Examples should be enabled.

Ack.

> 
> > +
> > +          fixed-link {
> > +            speed = <10000>;
> > +            full-duplex;
> > +            pause;
> > +          };
> > +        };
> > +
> > +        mac@1 {
> > +          compatible = "mediatek,eth-mac";
> > +          reg = <1>;
> > +          status = "disabled";
> > +          pcs-handle = <&usxgmiisys1>;
> > +        };
> > +
> > +        mac@2 {
> > +          compatible = "mediatek,eth-mac";
> > +          reg = <2>;
> > +          status = "disabled";
> > +          pcs-handle = <&usxgmiisys0>;
> > +        };
> > +
> > +        mdio_bus: mdio-bus {
> 
> mdio {
> 
> > +          #address-cells = <1>;
> > +          #size-cells = <0>;
> > +
> > +          /* internal 2.5G PHY */
> > +          int_2p5g_phy: ethernet-phy@15 {
> > +            reg = <15>;
> > +            compatible = "ethernet-phy-ieee802.3-c45";
> > +            phy-mode = "internal";
> > +          };
> > +        };
> > +      };
> > +    };
> > -- 
> > 2.42.1
> 

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