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Date: Fri, 20 Mar 2020 10:33:12 +0800
From: "Ramuthevar, Vadivel MuruganX"
<vadivel.muruganx.ramuthevar@...ux.intel.com>
To: Rob Herring <robh@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-spi@...r.kernel.org,
broonie@...nel.org, vigneshr@...com, devicetree@...r.kernel.org,
boris.brezillon@...e-electrons.com,
simon.k.r.goldschmidt@...il.com, dinguyen@...nel.org,
tien.fong.chee@...el.com, marex@...x.de,
linux-mtd@...ts.infradead.org, dwmw2@...radead.org, richard@....at,
computersforpeace@...il.com, cyrille.pitchen@...el.com,
david.oberhollenzer@...ma-star.at, miquel.raynal@...tlin.com,
tudor.ambarus@...il.com, cheol.yong.kim@...el.com,
qi-ming.wu@...el.com
Subject: Re: [PATCH v12 1/4] dt-bindings: spi: Add schema for Cadence QSPI
Controller driver
Hi Rob,
Thank you for the review comments...
On 20/3/2020 2:44 am, Rob Herring wrote:
> On Tue, Mar 10, 2020 at 09:52:10AM +0800, Ramuthevar,Vadivel MuruganX wrote:
>> From: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@...ux.intel.com>
>>
>> Add dt-bindings documentation for Cadence-QSPI controller to support
>> spi based flash memories.
>>
>> Signed-off-by: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@...ux.intel.com>
>> ---
>> .../devicetree/bindings/mtd/cadence-quadspi.txt | 67 -----------
>> .../devicetree/bindings/spi/cdns,qspi-nor.yaml | 127 +++++++++++++++++++++
>> 2 files changed, 127 insertions(+), 67 deletions(-)
>> delete mode 100644 Documentation/devicetree/bindings/mtd/cadence-quadspi.txt
>> create mode 100644 Documentation/devicetree/bindings/spi/cdns,qspi-nor.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/mtd/cadence-quadspi.txt b/Documentation/devicetree/bindings/mtd/cadence-quadspi.txt
>> deleted file mode 100644
>> index 945be7d5b236..000000000000
>> --- a/Documentation/devicetree/bindings/mtd/cadence-quadspi.txt
>> +++ /dev/null
>> @@ -1,67 +0,0 @@
>> -* Cadence Quad SPI controller
>> -
>> -Required properties:
>> -- compatible : should be one of the following:
>> - Generic default - "cdns,qspi-nor".
>> - For TI 66AK2G SoC - "ti,k2g-qspi", "cdns,qspi-nor".
>> - For TI AM654 SoC - "ti,am654-ospi", "cdns,qspi-nor".
>> -- reg : Contains two 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 QSPI Controller data area.
>> -- interrupts : Unit interrupt specifier for the controller interrupt.
>> -- clocks : phandle to the Quad SPI clock.
>> -- cdns,fifo-depth : Size of the data FIFO in words.
>> -- cdns,fifo-width : Bus width of the data FIFO in bytes.
>> -- cdns,trigger-address : 32-bit indirect AHB trigger address.
>> -
>> -Optional properties:
>> -- cdns,is-decoded-cs : Flag to indicate whether decoder is used or not.
>> -- cdns,rclk-en : Flag to indicate that QSPI return clock is used to latch
>> - the read data rather than the QSPI clock. Make sure that QSPI return
>> - clock is populated on the board before using this property.
>> -
>> -Optional subnodes:
>> -Subnodes of the Cadence Quad SPI controller are spi slave nodes with additional
>> -custom properties:
>> -- cdns,read-delay : Delay for read capture logic, in clock cycles
>> -- cdns,tshsl-ns : Delay in nanoseconds for the length that the master
>> - mode chip select outputs are de-asserted between
>> - transactions.
>> -- cdns,tsd2d-ns : Delay in nanoseconds between one chip select being
>> - de-activated and the activation of another.
>> -- cdns,tchsh-ns : Delay in nanoseconds between last bit of current
>> - transaction and deasserting the device chip select
>> - (qspi_n_ss_out).
>> -- cdns,tslch-ns : Delay in nanoseconds between setting qspi_n_ss_out low
>> - and first bit transfer.
>> -- resets : Must contain an entry for each entry in reset-names.
>> - See ../reset/reset.txt for details.
>> -- reset-names : Must include either "qspi" and/or "qspi-ocp".
>> -
>> -Example:
>> -
>> - qspi: spi@...05000 {
>> - compatible = "cdns,qspi-nor";
>> - #address-cells = <1>;
>> - #size-cells = <0>;
>> - reg = <0xff705000 0x1000>,
>> - <0xffa00000 0x1000>;
>> - interrupts = <0 151 4>;
>> - clocks = <&qspi_clk>;
>> - cdns,is-decoded-cs;
>> - cdns,fifo-depth = <128>;
>> - cdns,fifo-width = <4>;
>> - cdns,trigger-address = <0x00000000>;
>> - resets = <&rst QSPI_RESET>, <&rst QSPI_OCP_RESET>;
>> - reset-names = "qspi", "qspi-ocp";
>> -
>> - flash0: n25q00@0 {
>> - ...
>> - cdns,read-delay = <4>;
>> - cdns,tshsl-ns = <50>;
>> - cdns,tsd2d-ns = <50>;
>> - cdns,tchsh-ns = <4>;
>> - cdns,tslch-ns = <4>;
>> - };
>> - };
>> diff --git a/Documentation/devicetree/bindings/spi/cdns,qspi-nor.yaml b/Documentation/devicetree/bindings/spi/cdns,qspi-nor.yaml
>> new file mode 100644
>> index 000000000000..d21f80604af4
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/spi/cdns,qspi-nor.yaml
>> @@ -0,0 +1,127 @@
>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: "http://devicetree.org/schemas/spi/cdns,qspi-nor.yaml#"
>> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
>> +
>> +title: Cadence QSPI Flash Controller support
>> +
>> +maintainers:
>> + - Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@...ux.intel.com>
>> +
>> +allOf:
>> + - $ref: "spi-controller.yaml#"
>> +
>> +description: |
>> + Binding Documentation for Cadence QSPI controller,This controller is
>> + present in the Intel LGM, Altera SoCFPGA and TI SoCs and this driver
>> + has been tested On Intel's LGM SoC.
>> +
>> +properties:
>> + compatible:
>> + enum:
>> + - cdns,qspi-nor
>> + - ti,k2g-qspi
>> + - ti,am654-ospi
>> + - intel,lgm-qspi
>> +
>> + reg:
>> + maxItems: 2
>> +
>> + interrupts:
>> + maxItems: 1
>> +
>> + clocks:
>> + maxItems: 1
>> +
>> + cdns,fifo-depth:
>> + description:
>> + Depth of hardware FIFOs.
>> + allOf:
>> + - $ref: "/schemas/types.yaml#/definitions/uint32"
>> + - enum: [ 128, 256 ]
>> + - default: 128
>> +
>> + cdns,fifo-width:
>> + $ref: /schemas/types.yaml#/definitions/uint32
>> + description:
>> + 4 byte bus width of the data FIFO in bytes.
>> +
>> + cdns,trigger-address:
>> + $ref: /schemas/types.yaml#/definitions/uint32
>> + description:
>> + 32-bit indirect AHB trigger address.
>> +
>> + cdns,rclk-en:
>> + $ref: /schemas/types.yaml#/definitions/uint32
>> + description: |
>> + Flag to indicate that QSPI return clock is used to latch the read data
>> + rather than the QSPI clock. Make sure that QSPI return clock is populated
>> + on the board before using this property.
> Sounds like a boolean rather than a uint32? If not, then constraints on
> the values?
Good catch, will update.
>> +# subnode's properties
>> +patternProperties:
>> + "^.*@[0-9a-fA-F]+$":
> How many chip selects do you support? The unit-address can be limited as
> I'd guess it's less than 16. Also, should be lowercase hex.
MAX 16 , will update.
>> + type: object
>> + description:
>> + flash device uses the subnodes below defined properties.
>> +
>> + cdns,read-delay:
>> + $ref: /schemas/types.yaml#/definitions/uint32
>> + description:
>> + Delay in 4 microseconds, read capture logic, in clock cycles.
> 4us or clock cycles?
clock cycles
>> +
>> + cdns,tshsl-ns:
>> + description: |
>> + Delay in 50 nanoseconds, for the length that the master mode chip select
>> + outputs are de-asserted between transactions.
> Sounds like you can add:
>
> multipleOf: 50
>
>> +
>> + cdns,tsd2d-ns:
>> + description: |
>> + Delay in 50 nanoseconds, between one chip select being de-activated
>> + and the activation of another.
> Same here
>
>> +
>> + cdns,tchsh-ns:
>> + description: |
>> + Delay in 4 nanoseconds, between last bit of current transaction and
>> + deasserting the device chip select (qspi_n_ss_out).
> multipleOf: 4
>
>> +
>> + cdns,tslch-ns:
>> + description: |
>> + Delay in 4 nanoseconds, between setting qspi_n_ss_out low and
>> + first bit transfer.
> multipleOf: 4
Noted, will update all of the above.
>> +
>> +required:
>> + - compatible
>> + - reg
>> + - interrupts
>> + - clocks
>> + - cdns,fifo-depth
>> + - cdns,fifo-width
>> + - cdns,trigger-address
>> +
>> +examples:
>> + - |
>> + qspi: spi@...05000 {
> Drop the label.
Agreed!
>> + compatible = "cdns,qspi-nor";
>> + #address-cells = <1>;
>> + #size-cells = <0>;
>> + reg = <0xff705000 0x1000>,
>> + <0xffa00000 0x1000>;
>> + interrupts = <0 151 4>;
>> + clocks = <&qspi_clk>;
>> + cdns,fifo-depth = <128>;
>> + cdns,fifo-width = <4>;
>> + cdns,trigger-address = <0x00000000>;
>> +
>> + flash0: n25q00@0 {
> flash@0
Agreed!
Regards
Vadivel
>> + compatible = "jedec,spi-nor";
>> + reg = <0x0>;
>> + cdns,read-delay = <4>;
>> + cdns,tshsl-ns = <50>;
>> + cdns,tsd2d-ns = <50>;
>> + cdns,tchsh-ns = <4>;
>> + cdns,tslch-ns = <4>;
>> + };
>> + };
>> +
>> --
>> 2.11.0
>>
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