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Date: Wed, 19 Feb 2020 12:30:29 +0100
From: Konrad Kociolek <konrad@...ence.com>
To: Rob Herring <robh@...nel.org>
CC: Mark Brown <broonie@...nel.org>,
Mark Rutland <mark.rutland@....com>,
<linux-spi@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] Add dt-bindings for Cadence XSPI controller
The 02/05/2020 18:31, Rob Herring wrote:
>EXTERNAL MAIL
>
>
>On Tue, Jan 28, 2020 at 01:43:04PM +0100, Konrad Kociolek wrote:
>> Add dt-bindings documentation for Cadence XSPI controller to support
>> SPI based flash memories.
>>
>> Signed-off-by: Konrad Kociolek <konrad@...ence.com>
>> ---
>> Changes between initial version and v2:
>> - renamed yaml file
>> - added missing include
>>
>> .../devicetree/bindings/spi/cdns,xspi.yaml | 166 +++++++++++++++++++++
>> 1 file changed, 166 insertions(+)
>> create mode 100644 Documentation/devicetree/bindings/spi/cdns,xspi.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/spi/cdns,xspi.yaml b/Documentation/devicetree/bindings/spi/cdns,xspi.yaml
>> new file mode 100644
>> index 000000000000..e8c43957fd90
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/spi/cdns,xspi.yaml
>> @@ -0,0 +1,166 @@
>> +# SPDX-License-Identifier: (GPL-2.0)
>
>Dual license new bindings:
>
>(GPL-2.0-only OR BSD-2-Clause)
>
>> +# Copyright 2020 Cadence
>> +%YAML 1.2
>> +---
>> +$id: "https://urldefense.proofpoint.com/v2/url?u=http-3A__devicetree.org_schemas_spi_cdns-2Cxspi.yaml-23&d=DwIBAg&c=aUq983L2pue2FqKFoP6PGHMJQyoJ7kl3s3GZ-_haXqY&r=G7iI7AW4JEOXbx13Fe5B7uVPtTH6HSiaA_R5uR2HQjY&m=vgq1v6AC47kHEnD4BGadbiavRIW3wUjNWfh5fCNtivI&s=5GznvYUXU7Lk0eHcHCnJAsz0aKwZmZqEsGGo5A9i2l8&e= "
>> +$schema: "https://urldefense.proofpoint.com/v2/url?u=http-3A__devicetree.org_meta-2Dschemas_core.yaml-23&d=DwIBAg&c=aUq983L2pue2FqKFoP6PGHMJQyoJ7kl3s3GZ-_haXqY&r=G7iI7AW4JEOXbx13Fe5B7uVPtTH6HSiaA_R5uR2HQjY&m=vgq1v6AC47kHEnD4BGadbiavRIW3wUjNWfh5fCNtivI&s=pm5-krCiP_J-P48RO4mlub5ARy9eGOBfV59k8d02Q4g&e= "
>> +
>> +title: Cadence XSPI Controller
>> +
>> +maintainers:
>> + - Konrad Kociolek <konrad@...ence.com>
>> +
>> +description: |
>> + The XSPI controller allows SPI protocol communication in
>> + single, dual, quad or octal wire transmission modes for
>> + read/write access to slaves such as SPI-NOR flash.
>> +
>
>Needs a ref to spi-controller.yaml
>
>> +properties:
>> + compatible:
>> + const: cdns,xspi-nor-fpga
>> +
>> + reg:
>> + maxItems: 3
>> + description: |
>> + Contains three entries, each of which is a tuple consisting of a
>> + physical address and length. The first entry is the address and
>> + length of the controller register set. The second entry is the
>> + address and length of the Slave DMA data port. The third entry is
>> + the address and length of auxiliary registers.
>
>Split into 3 descriptions:
>
>items:
> - description: ...
> - description: ...
> - description: ...
>
>With that, drop 'maxItems' as it is implied.
>
>> +
>> + interrupts:
>> + maxItems: 1
>> +
>> + cdns,dqs-last-data-drop:
>> + type: boolean
>> + description: |
>> + This parameter should be set when the Flash Device being used
>> + issues data on negative edge of Flash clock and returns them with
>> + DQS and the PHY is configured to sample data in DQS mode.
>> + If this param is set the controller internally requests this redundant
>> + data at the end of the transfer cleaning up the PHY FIFO.
>> +
>> + cdns,phy-data-select-oe-start:
>> + $ref: /schemas/types.yaml#/definitions/uint32
>> + description: |
>> + Adjusts the starting point of the DQ pad output enable window.
>> + Lower numbers pull the rising edge earlier in time and larger
>> + numbers cause the rising edge to be delayed. Each bit changes
>> + the output enable time by a 1/2 cycle resolution.
>> +
>> + cdns,phy-data-select-oe-end:
>> + $ref: /schemas/types.yaml#/definitions/uint32
>> + description: |
>> + Adjusts the ending point of the DQ pad output enable window.
>> + Lower numbers pull the falling edge earlier in time and larger
>> + numbers cause the falling edge to be delayed. Each bit changes
>> + the output enable time by a 1/2 cycle resolution.
>> +
>> + cdns,phy-dqs-select-oe-start:
>> + $ref: /schemas/types.yaml#/definitions/uint32
>> + description: |
>> + Adjusts the starting point of the DQS pad output enable window.
>> + Lower numbers pull the rising edge earlier in time and larger
>> + numbers cause the rising edge to be delayed. Each bit changes
>> + the output enable time by a 1/2 cycle resolution.
>> +
>> + cdns,phy-dqs-select-oe-end:
>> + $ref: /schemas/types.yaml#/definitions/uint32
>> + description: |
>> + Adjusts the ending point of the DQS pad output enable window.
>> + Lower numbers pull the falling edge earlier in time and larger
>> + numbers cause the falling edge to be delayed. Each bit changes
>> + the output enable time by a 1/2 cycle resolution.
>> +
>> + cdns,phy-gate-cfg-close:
>> + $ref: /schemas/types.yaml#/definitions/uint32
>> + description: |
>> + Normally the gate is closing then all bits of dfi_cebar are high
>> + or when dfi_rd_pre_post_amble and rebar_dfi are high. This parameter
>> + allows to extend the closing of the DQS gate. Recommended zero.
>> +
>> + cdns,phy-gate-cfg:
>> + $ref: /schemas/types.yaml#/definitions/uint32
>> + description: |
>> + Coarse adjust of gate open time. This value is the number of cycles
>> + to delay the dfi_rddata_en signal prior to opening the gate in
>> + full cycle increments. Decreasing this value pulls the gate earlier
>> + in time. This field should be programmed such that the gate signal
>> + lands in the valid DQS gate window.
>> +
>> + cdns,phy-rd-del-select:
>> + $ref: /schemas/types.yaml#/definitions/uint32
>> + description: |
>> + Defines the read data delay. Holds the number of cycles to delay
>> + the dfi_rddata_en signal prior to enabling the read FIFO.
>> + After this delay, the read pointers begin incrementing the read FIFO.
>> +
>> + cdns,phy-clk-wr-delay:
>> + $ref: /schemas/types.yaml#/definitions/uint32
>> + description: |
>> + Controls the clk_wr delay line which adjusts the write DQ bit
>> + timing in 1/256th steps of the clock period in normal DLL
>> + locked mode. In bypass mode this field directly programs
>> + the number of delay elements.
>
>For all of these, any constraints on the values? default?
>
>> +
>> + cdns,phy-use-lpbk-dqs:
>> + type: boolean
>> + description: |
>> + This parameter chooses lpbk_dqs to capture data for reads.
>> + Instead memory DQS will be used.
>> +
>> + cdns,phy-use-ext-lpbk-dqs:
>> + type: boolean
>> + description: |
>> + This parameter chooses external lpbk_dqs for data capture
>> + (lpbk_dqs connected to the lpbk_dqs_IO pad). When not used
>> + mem_rebar_pad is used for data read capture.
>> +
>> +required:
>> + - compatible
>> + - reg
>> + - interrupts
>> + - cdns,phy-data-select-oe-start
>> + - cdns,phy-data-select-oe-end
>> + - cdns,phy-dqs-select-oe-start
>> + - cdns,phy-dqs-select-oe-end
>> + - cdns,phy-gate-cfg-close
>> + - cdns,phy-gate-cfg
>> + - cdns,phy-rd-del-select
>> + - cdns,phy-clk-wr-delay
>
>Is there no sensible default to make these optional?
>
Those parameters depend on connected flash memory, used FPGA board,
memory adapter and must be adjusted by user, to make memory
communication working.
>> +
>> +examples:
>> + - |
>> + #include <dt-bindings/interrupt-controller/irq.h>
>> +
>> + xspi: spi@...10000 {
>> + #address-cells = <1>;
>> + #size-cells = <0>;
>> + compatible = "cdns,xspi-nor-fpga";
>> + reg = <0x0 0xa0010000 0x0 0x10000>,
>> + <0x0 0xb0000000 0x0 0x10000>,
>> + <0x0 0xa0020000 0x0 0x10000>;
>> + interrupts = <0 90 IRQ_TYPE_LEVEL_HIGH>;
>> + interrupt-parent = <&gic>;
>> + cdns,dqs-last-data-drop;
>> + cdns,phy-data-select-oe-start = <0>;
>> + cdns,phy-data-select-oe-end = <4>;
>> + cdns,phy-dqs-select-oe-start = <0>;
>> + cdns,phy-dqs-select-oe-end = <1>;
>> + cdns,phy-gate-cfg-close = <3>;
>> + cdns,phy-gate-cfg = <0>;
>> + cdns,phy-rd-del-select = <5>;
>> + cdns,phy-clk-wr-delay = <64>;
>> + cdns,phy-use-lpbk-dqs;
>> + cdns,phy-use-ext-lpbk-dqs;
>> + mt35xu512@0 {
>
>flash@0
>
>> + compatible = "spi-nor", "micron,mt35xu512";
>
>Wrong order. Most specific first.
>
>> + spi-max-frequency = <75000000>;
>> + reg = <0>;
>> + };
>> + mt35xu512@1 {
>
>flash@1
>
>> + compatible = "spi-nor", "micron,mt35xu512";
>> + spi-max-frequency = <75000000>;
>> + reg = <1>;
>> + };
>> + };
>> --
>> 2.15.0
>>
--
--
Konrad Kociolek
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