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Date:   Wed, 16 Dec 2020 12:10:25 +0300
From:   Serge Semin <Sergey.Semin@...kalelectronics.ru>
To:     Rob Herring <robh@...nel.org>
CC:     Serge Semin <fancer.lancer@...il.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Johan Hovold <johan@...nel.org>,
        Maxime Ripard <mripard@...nel.org>,
        Joao Pinto <jpinto@...opsys.com>,
        Lars Persson <larper@...s.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        Vyacheslav Mitrofanov 
        <Vyacheslav.Mitrofanov@...kalelectronics.ru>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        <netdev@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 07/25] dt-bindings: net: dwmac: Detach Generic DW MAC
 bindings

On Tue, Dec 15, 2020 at 11:50:02AM -0600, Rob Herring wrote:
> On Mon, Dec 14, 2020 at 12:15:57PM +0300, Serge Semin wrote:
> > Currently the snps,dwmac.yaml DT bindings file is used for both DT nodes
> > describing generic DW MAC devices and as DT schema with common properties
> > to be evaluated against a vendor-specific DW MAC IP-cores. Due to such
> > dual-purpose design the "compatible" property of the common DW MAC schema
> > needs to contain the vendor-specific strings to successfully pass the
> > schema evaluation in case if it's referenced from the vendor-specific DT
> > bindings. That's a bad design from maintainability point of view, since
> > adding/removing any DW MAC-based device bindings requires the common
> > schema modification. In order to fix that let's detach the schema which
> > provides the generic DW MAC DT nodes evaluation into a dedicated DT
> > bindings file preserving the common DW MAC properties declaration in the
> > snps,dwmac.yaml file. By doing so we'll still provide a common properties
> > evaluation for each vendor-specific MAC bindings which refer to the
> > common bindings file, while the generic DW MAC DT nodes will be checked
> > against the new snps,dwmac-generic.yaml DT schema.
> 

> I'm okay with the change, but it needs a big fat note that 
> snps,dwmac-generic.yaml should not have new users. New users should have 
> an SoC specific compatible. History has shown that even IP versions are 
> not enough to handle all the integration crap vendors do.

Agreed. I'll add such note to the "description" text of the
snps,dwmac-generic.yaml schema. Is that ok?

-Sergey

> 
> > 
> > Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> > ---
> >  .../bindings/net/snps,dwmac-generic.yaml      | 148 ++++++++++++++++++
> >  .../devicetree/bindings/net/snps,dwmac.yaml   | 139 +---------------
> >  2 files changed, 149 insertions(+), 138 deletions(-)
> >  create mode 100644 Documentation/devicetree/bindings/net/snps,dwmac-generic.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/net/snps,dwmac-generic.yaml b/Documentation/devicetree/bindings/net/snps,dwmac-generic.yaml
> > new file mode 100644
> > index 000000000000..f1b387911390
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/net/snps,dwmac-generic.yaml
> > @@ -0,0 +1,148 @@
> > +# SPDX-License-Identifier: GPL-2.0
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/net/snps,dwmac-generic.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Synopsys DesignWare Generic MAC Device Tree Bindings
> > +
> > +maintainers:
> > +  - Alexandre Torgue <alexandre.torgue@...com>
> > +  - Giuseppe Cavallaro <peppe.cavallaro@...com>
> > +  - Jose Abreu <joabreu@...opsys.com>
> > +
> > +# Select the DT nodes, which have got compatible strings either as just a
> > +# single string with IP-core name optionally followed by the IP version or
> > +# two strings: one with IP-core name plus the IP version, another as just
> > +# the IP-core name.
> > +select:
> > +  properties:
> > +    compatible:
> > +      oneOf:
> > +        - items:
> > +            - pattern: "^snps,dw(xg)+mac(-[0-9]+\\.[0-9]+a?)?$"
> > +        - items:
> > +            - pattern: "^snps,dwmac-[0-9]+\\.[0-9]+a?$"
> > +            - const: snps,dwmac
> > +        - items:
> > +            - pattern: "^snps,dwxgmac-[0-9]+\\.[0-9]+a?$"
> > +            - const: snps,dwxgmac
> > +
> > +  required:
> > +    - compatible
> > +
> > +allOf:
> > +  - $ref: snps,dwmac.yaml#
> > +
> > +properties:
> > +  compatible:
> > +    oneOf:
> > +      - description: Generic Synopsys DW MAC
> > +        oneOf:
> > +          - items:
> > +              - enum:
> > +                  - snps,dwmac-3.50a
> > +                  - snps,dwmac-3.610
> > +                  - snps,dwmac-3.70a
> > +                  - snps,dwmac-3.710
> > +                  - snps,dwmac-4.00
> > +                  - snps,dwmac-4.10a
> > +                  - snps,dwmac-4.20a
> > +              - const: snps,dwmac
> > +          - const: snps,dwmac
> > +      - description: Generic Synopsys DW xGMAC
> > +        oneOf:
> > +          - items:
> > +              - enum:
> > +                  - snps,dwxgmac-2.10
> > +              - const: snps,dwxgmac
> > +          - const: snps,dwxgmac
> > +      - description: ST SPEAr SoC Family GMAC
> > +        deprecated: true
> > +        const: st,spear600-gmac
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +unevaluatedProperties: false
> > +
> > +examples:
> > +  - |
> > +    gmac0: ethernet@...00000 {
> > +      compatible = "snps,dwxgmac-2.10", "snps,dwxgmac";
> > +      reg = <0xe0800000 0x8000>;
> > +      interrupt-parent = <&vic1>;
> > +      interrupts = <24 23 22>;
> > +      interrupt-names = "macirq", "eth_wake_irq", "eth_lpi";
> > +      mac-address = [000000000000]; /* Filled in by U-Boot */
> > +      max-frame-size = <3800>;
> > +      phy-mode = "gmii";
> > +      snps,multicast-filter-bins = <256>;
> > +      snps,perfect-filter-entries = <128>;
> > +      rx-fifo-depth = <16384>;
> > +      tx-fifo-depth = <16384>;
> > +      clocks = <&clock>;
> > +      clock-names = "stmmaceth";
> > +      snps,axi-config = <&stmmac_axi_setup>;
> > +      snps,mtl-rx-config = <&mtl_rx_setup>;
> > +      snps,mtl-tx-config = <&mtl_tx_setup>;
> > +      mdio0 {
> > +        #address-cells = <1>;
> > +        #size-cells = <0>;
> > +        compatible = "snps,dwmac-mdio";
> > +        phy1: ethernet-phy@0 {
> > +          reg = <0>;
> > +        };
> > +      };
> > +    };
> > +  - |
> > +    gmac1: ethernet@...10000 {
> > +      compatible = "snps,dwmac-4.10a", "snps,dwmac";
> > +      reg = <0xf8010000 0x4000>;
> > +      interrupts = <0 98 4>;
> > +      interrupt-names = "macirq";
> > +      clock-names = "stmmaceth", "ptp_ref";
> > +      clocks = <&clock 4>, <&clock 5>;
> > +      phy-mode = "rgmii";
> > +      snps,txpbl = <8>;
> > +      snps,rxpbl = <2>;
> > +      snps,aal;
> > +      snps,tso;
> > +
> > +      snps,axi-config {
> > +        snps,wr_osr_lmt = <0xf>;
> > +        snps,rd_osr_lmt = <0xf>;
> > +        snps,blen = <256 128 64 32 0 0 0>;
> > +      };
> > +
> > +      snps,mtl-rx-config {
> > +        snps,rx-queues-to-use = <1>;
> > +        snps,rx-sched-sp;
> > +        queue0 {
> > +          snps,dcb-algorithm;
> > +          snps,map-to-dma-channel = <0x0>;
> > +          snps,priority = <0x0>;
> > +        };
> > +      };
> > +
> > +      snps,mtl-tx-config {
> > +        snps,tx-queues-to-use = <2>;
> > +        snps,tx-sched-wrr;
> > +
> > +        queue0 {
> > +          snps,weight = <0x10>;
> > +          snps,dcb-algorithm;
> > +          snps,priority = <0x0>;
> > +        };
> > +
> > +        queue1 {
> > +          snps,avb-algorithm;
> > +          snps,send_slope = <0x1000>;
> > +          snps,idle_slope = <0x1000>;
> > +          snps,high_credit = <0x3E800>;
> > +          snps,low_credit = <0x1FC18000>;
> > +          snps,priority = <0x1>;
> > +        };
> > +      };
> > +    };
> > +...
> > diff --git a/Documentation/devicetree/bindings/net/snps,dwmac.yaml b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> > index 74820f491346..72b58f86bc41 100644
> > --- a/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> > +++ b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> > @@ -11,31 +11,7 @@ maintainers:
> >    - Giuseppe Cavallaro <peppe.cavallaro@...com>
> >    - Jose Abreu <joabreu@...opsys.com>
> >  
> > -# Select every compatible, including the deprecated ones. This way, we
> > -# will be able to report a warning when we have that compatible, since
> > -# we will validate the node thanks to the select, but won't report it
> > -# as a valid value in the compatible property description
> > -select:
> > -  properties:
> > -    compatible:
> > -      contains:
> > -        enum:
> > -          - snps,dwmac
> > -          - snps,dwmac-3.50a
> > -          - snps,dwmac-3.610
> > -          - snps,dwmac-3.70a
> > -          - snps,dwmac-3.710
> > -          - snps,dwmac-4.00
> > -          - snps,dwmac-4.10a
> > -          - snps,dwmac-4.20a
> > -          - snps,dwxgmac
> > -          - snps,dwxgmac-2.10
> > -
> > -          # Deprecated
> > -          - st,spear600-gmac
> > -
> > -  required:
> > -    - compatible
> > +select: false
> >  
> >  allOf:
> >    - $ref: "ethernet-controller.yaml#"
> > @@ -62,35 +38,6 @@ allOf:
> >              MAC HW capability register.
> >  
> >  properties:
> > -
> > -  # We need to include all the compatibles from schemas that will
> > -  # include that schemas, otherwise compatible won't validate for
> > -  # those.
> > -  compatible:
> > -    contains:
> > -      enum:
> > -        - allwinner,sun7i-a20-gmac
> > -        - allwinner,sun8i-a83t-emac
> > -        - allwinner,sun8i-h3-emac
> > -        - allwinner,sun8i-r40-emac
> > -        - allwinner,sun8i-v3s-emac
> > -        - allwinner,sun50i-a64-emac
> > -        - amlogic,meson6-dwmac
> > -        - amlogic,meson8b-dwmac
> > -        - amlogic,meson8m2-dwmac
> > -        - amlogic,meson-gxbb-dwmac
> > -        - amlogic,meson-axg-dwmac
> > -        - snps,dwmac
> > -        - snps,dwmac-3.50a
> > -        - snps,dwmac-3.610
> > -        - snps,dwmac-3.70a
> > -        - snps,dwmac-3.710
> > -        - snps,dwmac-4.00
> > -        - snps,dwmac-4.10a
> > -        - snps,dwmac-4.20a
> > -        - snps,dwxgmac
> > -        - snps,dwxgmac-2.10
> > -
> >    reg:
> >      minItems: 1
> >      maxItems: 2
> > @@ -543,88 +490,4 @@ dependencies:
> >    snps,reset-delay-us: ["snps,reset-gpio"]
> >  
> >  additionalProperties: true
> > -
> > -examples:
> > -  - |
> > -    gmac0: ethernet@...00000 {
> > -        compatible = "snps,dwxgmac-2.10", "snps,dwxgmac";
> > -        reg = <0xe0800000 0x8000>;
> > -        interrupt-parent = <&vic1>;
> > -        interrupts = <24 23 22>;
> > -        interrupt-names = "macirq", "eth_wake_irq", "eth_lpi";
> > -        mac-address = [000000000000]; /* Filled in by U-Boot */
> > -        max-frame-size = <3800>;
> > -        phy-mode = "gmii";
> > -        snps,multicast-filter-bins = <256>;
> > -        snps,perfect-filter-entries = <128>;
> > -        rx-fifo-depth = <16384>;
> > -        tx-fifo-depth = <16384>;
> > -        clocks = <&clock>;
> > -        clock-names = "stmmaceth";
> > -        snps,axi-config = <&stmmac_axi_setup>;
> > -        snps,mtl-rx-config = <&mtl_rx_setup>;
> > -        snps,mtl-tx-config = <&mtl_tx_setup>;
> > -        mdio0 {
> > -            #address-cells = <1>;
> > -            #size-cells = <0>;
> > -            compatible = "snps,dwmac-mdio";
> > -            phy1: ethernet-phy@0 {
> > -                reg = <0>;
> > -            };
> > -        };
> > -    };
> > -  - |
> > -    gmac1: ethernet@...10000 {
> > -        compatible = "snps,dwmac-4.10a", "snps,dwmac";
> > -        reg = <0xf8010000 0x4000>;
> > -        interrupts = <0 98 4>;
> > -        interrupt-names = "macirq";
> > -        clock-names = "stmmaceth", "ptp_ref";
> > -        clocks = <&clock 4>, <&clock 5>;
> > -        phy-mode = "rgmii";
> > -        snps,txpbl = <8>;
> > -        snps,rxpbl = <2>;
> > -        snps,aal;
> > -        snps,tso;
> > -
> > -        snps,axi-config {
> > -            snps,wr_osr_lmt = <0xf>;
> > -            snps,rd_osr_lmt = <0xf>;
> > -            snps,blen = <256 128 64 32 0 0 0>;
> > -        };
> > -
> > -        snps,mtl-rx-config {
> > -            snps,rx-queues-to-use = <1>;
> > -            snps,rx-sched-sp;
> > -            queue0 {
> > -               snps,dcb-algorithm;
> > -               snps,map-to-dma-channel = <0x0>;
> > -               snps,priority = <0x0>;
> > -            };
> > -        };
> > -
> > -        snps,mtl-tx-config {
> > -            snps,tx-queues-to-use = <2>;
> > -            snps,tx-sched-wrr;
> > -            queue0 {
> > -                snps,weight = <0x10>;
> > -                snps,dcb-algorithm;
> > -                snps,priority = <0x0>;
> > -            };
> > -
> > -            queue1 {
> > -                snps,avb-algorithm;
> > -                snps,send_slope = <0x1000>;
> > -                snps,idle_slope = <0x1000>;
> > -                snps,high_credit = <0x3E800>;
> > -                snps,low_credit = <0xFFC18000>;
> > -                snps,priority = <0x1>;
> > -            };
> > -        };
> > -    };
> > -
> > -# FIXME: We should set it, but it would report all the generic
> > -# properties as additional properties.
> > -# additionalProperties: false
> > -
> >  ...
> > -- 
> > 2.29.2
> > 

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