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Message-ID: <20201214143006.GA1864564@robh.at.kernel.org>
Date: Mon, 14 Dec 2020 08:30:06 -0600
From: Rob Herring <robh@...nel.org>
To: Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc: 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>,
Serge Semin <fancer.lancer@...il.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 04/25] dt-bindings: net: dwmac: Refactor snps,*-config
properties
On Mon, Dec 14, 2020 at 12:15:54PM +0300, Serge Semin wrote:
> Currently the "snps,axi-config", "snps,mtl-rx-config" and
> "snps,mtl-tx-config" properties are declared as a single phandle reference
> to a node with corresponding parameters defined. That's not good for
> several reasons. First of all scattering around a device tree some
> particular device-specific configs with no visual relation to that device
> isn't suitable from maintainability point of view. That leads to a
> disturbed representation of the actual device tree mixing actual device
> nodes and some vendor-specific configs. Secondly using the same configs
> set for several device nodes doesn't represent well the devices structure,
> since the interfaces these configs describe in hardware belong to
> different devices and may actually differ. In the later case having the
> configs node separated from the corresponding device nodes gets to be
> even unjustified.
>
> So instead of having a separate DW *MAC configs nodes we suggest to
> define them as sub-nodes of the device nodes, which interfaces they
> actually describe. By doing so we'll make the DW *MAC nodes visually
> correct describing all the aspects of the IP-core configuration. Thus
> we'll be able to describe the configs sub-nodes bindings right in the
> snps,dwmac.yaml file.
>
> Note the former "snps,axi-config", "snps,mtl-rx-config" and
> "snps,mtl-tx-config" bindings have been marked as deprecated.
>
> Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
>
> ---
>
> Note the current DT schema tool requires the vendor-specific properties to be
> defined in accordance with the schema: dtschema/meta-schemas/vendor-props.yaml
> It means the property can be;
> - boolean,
> - string,
> - defined with $ref and additional constraints,
> - defined with allOf: [ $ref ] and additional constraints.
>
> The modification provided by this commit needs to extend that definition to
> make the DT schema tool correctly parse this schema. That is we need to let
> the vendors-specific properties to also accept the oneOf-based combined
> sub-schema. Like this:
>
> --- a/dtschema/meta-schemas/vendor-props.yaml
> +++ b/dtschema/meta-schemas/vendor-props.yaml
> @@ -48,15 +48,24 @@
> - properties: # A property with a type and additional constraints
> $ref:
> pattern: "types.yaml#[\/]{0,1}definitions\/.*"
> - allOf:
> - items:
> - - properties:
> +
> + if:
> + not:
> + required:
> + - $ref
> + then:
> + patternProperties:
> + "^(all|one)Of$":
> + contains:
> + properties:
> $ref:
> pattern: "types.yaml#[\/]{0,1}definitions\/.*"
> required:
> - $ref
> - oneOf:
> +
> + anyOf:
> - required: [ $ref ]
> - required: [ allOf ]
> + - required: [ oneOf ]
>
> ...
> ---
> .../devicetree/bindings/net/snps,dwmac.yaml | 380 +++++++++++++-----
> 1 file changed, 288 insertions(+), 92 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/net/snps,dwmac.yaml b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> index 0dd543c6c08e..44aa88151cba 100644
> --- a/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> +++ b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> @@ -150,69 +150,251 @@ properties:
> in a different mode than the PHY in order to function.
>
> snps,axi-config:
> - $ref: /schemas/types.yaml#definitions/phandle
> - description:
> - AXI BUS Mode parameters. Phandle to a node that can contain the
> - following properties
> - * snps,lpi_en, enable Low Power Interface
> - * snps,xit_frm, unlock on WoL
> - * snps,wr_osr_lmt, max write outstanding req. limit
> - * snps,rd_osr_lmt, max read outstanding req. limit
> - * snps,kbbe, do not cross 1KiB boundary.
> - * snps,blen, this is a vector of supported burst length.
> - * snps,fb, fixed-burst
> - * snps,mb, mixed-burst
> - * snps,rb, rebuild INCRx Burst
> + description: AXI BUS Mode parameters
> + oneOf:
> + - deprecated: true
> + $ref: /schemas/types.yaml#definitions/phandle
> + - type: object
> + properties:
Anywhere have have the same node/property string meaning 2 different
things is a pain, let's not create another one. Just define a new node
'axi-config'. Or just put all the properties into the node directly.
Grouping them has little purpose.
> + snps,lpi_en:
> + $ref: /schemas/types.yaml#definitions/flag
> + description: Enable Low Power Interface
> +
> + snps,xit_frm:
> + $ref: /schemas/types.yaml#definitions/flag
> + description: Unlock on WoL
> +
> + snps,wr_osr_lmt:
> + $ref: /schemas/types.yaml#definitions/uint32
> + description: Max write outstanding req. limit
> + default: 1
> + minimum: 0
> + maximum: 15
> +
> + snps,rd_osr_lmt:
> + $ref: /schemas/types.yaml#definitions/uint32
> + description: Max read outstanding req. limit
> + default: 1
> + minimum: 0
> + maximum: 15
> +
> + snps,kbbe:
> + $ref: /schemas/types.yaml#definitions/flag
> + description: Do not cross 1KiB boundary
> +
> + snps,blen:
> + $ref: /schemas/types.yaml#definitions/uint32-array
> + description: A vector of supported burst lengths
> + minItems: 7
> + maxItems: 7
> + items:
> + enum: [256, 128, 64, 32, 16, 8, 4, 0]
> +
> + snps,fb:
> + $ref: /schemas/types.yaml#definitions/flag
> + description: Fixed-burst
> +
> + snps,mb:
> + $ref: /schemas/types.yaml#definitions/flag
> + description: Mixed-burst
> +
> + snps,rb:
> + $ref: /schemas/types.yaml#definitions/flag
> + description: Rebuild INCRx Burst
> +
> + additionalProperties: false
>
> snps,mtl-rx-config:
> - $ref: /schemas/types.yaml#definitions/phandle
> description:
> - Multiple RX Queues parameters. Phandle to a node that can
> - contain the following properties
> - * snps,rx-queues-to-use, number of RX queues to be used in the
> - driver
> - * Choose one of these RX scheduling algorithms
> - * snps,rx-sched-sp, Strict priority
> - * snps,rx-sched-wsp, Weighted Strict priority
> - * For each RX queue
> - * Choose one of these modes
> - * snps,dcb-algorithm, Queue to be enabled as DCB
> - * snps,avb-algorithm, Queue to be enabled as AVB
> - * snps,map-to-dma-channel, Channel to map
> - * Specifiy specific packet routing
> - * snps,route-avcp, AV Untagged Control packets
> - * snps,route-ptp, PTP Packets
> - * snps,route-dcbcp, DCB Control Packets
> - * snps,route-up, Untagged Packets
> - * snps,route-multi-broad, Multicast & Broadcast Packets
> - * snps,priority, RX queue priority (Range 0x0 to 0xF)
> + Multiple RX Queues parameters
> + oneOf:
> + - deprecated: true
> + $ref: /schemas/types.yaml#definitions/phandle
> + - type: object
> + properties:
> + snps,rx-queues-to-use:
> + $ref: /schemas/types.yaml#definitions/uint32
> + description: Number of RX queues to be used in the driver
> + default: 1
> + minimum: 1
> +
> + patternProperties:
> + "^snps,rx-sched-(sp|wsp)$":
> + $ref: /schemas/types.yaml#definitions/flag
> + description: Strict/Weighted Strict RX scheduling priority
> +
> + "^queue[0-9]$":
> + type: object
> + description: Each RX Queue parameters
> +
> + properties:
> + snps,map-to-dma-channel:
> + $ref: /schemas/types.yaml#definitions/uint32
> + description: DMA channel to map
> +
> + snps,priority:
> + $ref: /schemas/types.yaml#definitions/uint32
> + description: RX queue priority
> + minimum: 0
> + maximum: 15
> +
> + patternProperties:
> + "^snps,(dcb|avb)-algorithm$":
> + $ref: /schemas/types.yaml#definitions/flag
> + description: Enable Queue as DCB/AVB
> +
> + "^snps,route-(avcp|ptp|dcbcp|up|multi-broad)$":
> + $ref: /schemas/types.yaml#definitions/flag
> + description:
> + AV Untagged/PTP/DCB Control/Untagged/Multicast & Broadcast
> + packets routing respectively.
> +
> + additionalProperties: false
> +
> + # Choose only one of the Queue modes and the packets routing
> + allOf:
> + - not:
> + required:
> + - snps,dcb-algorithm
> + - snps,avb-algorithm
> + - oneOf:
> + - required:
> + - snps,route-avcp
> + - required:
> + - snps,route-ptp
> + - required:
> + - snps,route-dcbcp
> + - required:
> + - snps,route-up
> + - required:
> + - snps,route-multi-broad
> + - not:
> + anyOf:
> + - required:
> + - snps,route-avcp
> + - required:
> + - snps,route-ptp
> + - required:
> + - snps,route-dcbcp
> + - required:
> + - snps,route-up
> + - required:
> + - snps,route-multi-broad
> +
> + additionalProperties: false
> +
> + # Choose one of the RX scheduling algorithms
> + not:
> + required:
> + - snps,rx-sched-sp
> + - snps,rx-sched-wsp
>
> snps,mtl-tx-config:
> - $ref: /schemas/types.yaml#definitions/phandle
> description:
> - Multiple TX Queues parameters. Phandle to a node that can
> - contain the following properties
> - * snps,tx-queues-to-use, number of TX queues to be used in the
> - driver
> - * Choose one of these TX scheduling algorithms
> - * snps,tx-sched-wrr, Weighted Round Robin
> - * snps,tx-sched-wfq, Weighted Fair Queuing
> - * snps,tx-sched-dwrr, Deficit Weighted Round Robin
> - * snps,tx-sched-sp, Strict priority
> - * For each TX queue
> - * snps,weight, TX queue weight (if using a DCB weight
> - algorithm)
> - * Choose one of these modes
> - * snps,dcb-algorithm, TX queue will be working in DCB
> - * snps,avb-algorithm, TX queue will be working in AVB
> - [Attention] Queue 0 is reserved for legacy traffic
> - and so no AVB is available in this queue.
> - * Configure Credit Base Shaper (if AVB Mode selected)
> - * snps,send_slope, enable Low Power Interface
> - * snps,idle_slope, unlock on WoL
> - * snps,high_credit, max write outstanding req. limit
> - * snps,low_credit, max read outstanding req. limit
> - * snps,priority, TX queue priority (Range 0x0 to 0xF)
> + Multiple TX Queues parameters
> + oneOf:
> + - deprecated: true
> + $ref: /schemas/types.yaml#definitions/phandle
> + - type: object
> + properties:
> + snps,tx-queues-to-use:
> + $ref: /schemas/types.yaml#definitions/uint32
> + description: Number of TX queues to be used in the driver
> + default: 1
> + minimum: 1
> +
> + patternProperties:
> + "^snps,tx-sched-(wrr|wfq|dwrr|sp)$":
> + $ref: /schemas/types.yaml#definitions/flag
> + description:
> + Weighted Round Robin, Weighted Fair Queuing,
> + Deficit Weighted Round Robin or Strict TX scheduling priority.
> +
> + "^queue[0-9]$":
> + type: object
> + description: Each TX Queue parameters
> +
> + properties:
> + snps,priority:
> + $ref: /schemas/types.yaml#definitions/uint32
> + description: TX queue priority
> + minimum: 0
> + maximum: 15
> +
> + snps,weight:
> + $ref: /schemas/types.yaml#definitions/uint32
> + description: TX queue weight (if using a DCB weight algorithm)
> + minimum: 0
> + maximum: 0x1FFFFF
> +
> + snps,send_slope:
> + $ref: /schemas/types.yaml#definitions/uint32
> + description: Enable Low Power Interface
> + minimum: 0
> + maximum: 0x3FFF
> +
> + snps,idle_slope:
> + $ref: /schemas/types.yaml#definitions/uint32
> + description: Unlock on WoL
> + minimum: 0
> + maximum: 0x1FFFFF
> +
> + snps,high_credit:
> + $ref: /schemas/types.yaml#definitions/uint32
> + description: Max write outstanding req. limit
> + minimum: 0
> + maximum: 0x1FFFFFFF
> +
> + snps,low_credit:
> + $ref: /schemas/types.yaml#definitions/uint32
> + description: Max read outstanding req. limit
> + minimum: 0
> + maximum: 0x1FFFFFFF
> +
> + patternProperties:
> + "^snps,(dcb|avb)-algorithm$":
> + $ref: /schemas/types.yaml#definitions/flag
> + description:
> + Enable Queue as DCB/AVB. Note Queue 0 is reserved for legacy
> + traffic and so no AVB is available in this queue.
> +
> + additionalProperties: false
> +
> + # Choose only one of the Queue modes
> + not:
> + required:
> + - snps,dcb-algorithm
> + - snps,avb-algorithm
> +
> + # Credit Base Shaper is configurable for AVB Mode only
> + dependencies:
> + snps,send_slope: ["snps,avb-algorithm"]
> + snps,idle_slope: ["snps,avb-algorithm"]
> + snps,high_credit: ["snps,avb-algorithm"]
> + snps,low_credit: ["snps,avb-algorithm"]
> +
> + additionalProperties: false
> +
> + # Choose one of the TX scheduling algorithms
> + oneOf:
> + - required:
> + - snps,tx-sched-wrr
> + - required:
> + - snps,tx-sched-wfq
> + - required:
> + - snps,tx-sched-dwrr
> + - required:
> + - snps,tx-sched-sp
> + - not:
> + anyOf:
> + - required:
> + - snps,tx-sched-wrr
> + - required:
> + - snps,tx-sched-wfq
> + - required:
> + - snps,tx-sched-dwrr
> + - required:
> + - snps,tx-sched-sp
>
> snps,reset-gpio:
> deprecated: true
> @@ -342,41 +524,6 @@ additionalProperties: true
>
> examples:
> - |
> - stmmac_axi_setup: stmmac-axi-config {
> - snps,wr_osr_lmt = <0xf>;
> - snps,rd_osr_lmt = <0xf>;
> - snps,blen = <256 128 64 32 0 0 0>;
> - };
> -
> - mtl_rx_setup: rx-queues-config {
> - snps,rx-queues-to-use = <1>;
> - snps,rx-sched-sp;
> - queue0 {
> - snps,dcb-algorithm;
> - snps,map-to-dma-channel = <0x0>;
> - snps,priority = <0x0>;
> - };
> - };
> -
> - mtl_tx_setup: tx-queues-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>;
> - };
> - };
> -
> gmac0: ethernet@...00000 {
> compatible = "snps,dwxgmac-2.10", "snps,dwxgmac";
> reg = <0xe0800000 0x8000>;
> @@ -404,6 +551,55 @@ examples:
> };
> };
> };
> + - |
> + 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.
> --
> 2.29.2
>
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