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Message-ID: <20201215085421.v5aepprkk2iyimaw@mobilestation>
Date: Tue, 15 Dec 2020 11:54:21 +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 04/25] dt-bindings: net: dwmac: Refactor snps,*-config
properties
Hello Rob,
On Mon, Dec 14, 2020 at 08:30:06AM -0600, Rob Herring wrote:
> 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.
IIUC you meant that having a node and property with the same name
isn't ok. Right? If so could you explain why not? especially seeing
the property is expected to be set with phandle reference to that
node. That seemed like a perfect solution to me. We wouldn't need to
introduce a new property/node name, but just deprecate the
corresponding name to be a property.
> Just define a new node
> 'axi-config'. Or just put all the properties into the node directly.
> Grouping them has little purpose.
Hm, you suggest to remove the vendor prefix, right? If so what about
the rest of the changes introduced here in this patch? They concern
"snps,mtl-tx-config" and "snps,mtl-rx-config" properties (please note
these changes are a bit more complicated than once connected with
"snps,axi-config"). Should I remove the vendor-prefix from them too?
Anyway that seems a bit questionable, because all the "snps,*-config"
properties/nodes seems more vendor-specific than generic. Am I wrong
in that matter?
If you think they are generic, then the "{axi,mtl-rx,mtl-tx}-config"
nodes most likely should be described in the dedicated DT schema...
-Sergey
>
> > + 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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