Re: [PATCH] dt-bindings: spi: Convert Freescale DSPI to json schema

Re: [PATCH] dt-bindings: spi: Convert Freescale DSPI to json schema

[Pratyush Yadav]

+Cc mtd list

Hi,

On 15/03/21 05:45PM, Kuldeep Singh wrote:
> Convert the Freescale DSPI binding to DT schema format using json-schema.
> 
> Signed-off-by: Kuldeep Singh <kuldeep.singh@nxp.com>
> ---
> Hi Rob,
> This patch is checked with following commands with no warnings observed.
> make distclean; make allmodconfig;
> make dt_binding_check DT_SCHEMA_FILES=Documentation/devicetree/bindings/spi/fsl,spi-fsl-dspi.yaml;
> make dtbs_check DT_SCHEMA_FILES=Documentation/devicetree/bindings/spi/fsl,spi-fsl-dspi.yaml

When I add the "fsl,spi-cs-sck-delay" property under the flash@0 node in 
the example and run dt_binding_check, I see the below error:

  /home/pratyush/src/linux/Documentation/devicetree/bindings/spi/fsl,spi-fsl-dspi.example.dt.yaml: flash@0: 'fsl,spi-cs-sck-delay' does not match any of the regexes: '^partition@', 'pinctrl-[0-9]+'
     From schema: /home/pratyush/src/lin/Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml

I am trying to solve a similar problem for the Cadence QSPI controller 
binding and I wonder what the best solution for this is. The obvious one 
would be to add these properties to jedec,spi-nor.yaml. I haven't 
managed to come up with any other solution to this problem.

Rob, all, any suggestions on how to best model this?

> 
>  .../bindings/spi/fsl,spi-fsl-dspi.yaml        | 131 ++++++++++++++++++
>  .../devicetree/bindings/spi/spi-fsl-dspi.txt  |  65 ---------
>  MAINTAINERS                                   |   2 +-
>  3 files changed, 132 insertions(+), 66 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/spi/fsl,spi-fsl-dspi.yaml
>  delete mode 100644 Documentation/devicetree/bindings/spi/spi-fsl-dspi.txt
> 
> diff --git a/Documentation/devicetree/bindings/spi/fsl,spi-fsl-dspi.yaml b/Documentation/devicetree/bindings/spi/fsl,spi-fsl-dspi.yaml
> new file mode 100644
> index 000000000000..15ffc83bdba6
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/spi/fsl,spi-fsl-dspi.yaml
> @@ -0,0 +1,131 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/spi/fsl,spi-fsl-dspi.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Freescale DSPI Controller
> +
> +maintainers:
> +  - Vladimir Oltean <olteanv@gmail.com>
> +
> +allOf:
> +  - $ref: "spi-controller.yaml#"
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - enum:
> +          - fsl,vf610-dspi
> +          - fsl,ls1021a-v1.0-dspi
> +          - fsl,ls1028a-dspi
> +          - fsl,ls2085a-dspi
> +          - fsl,lx2160a-dspi
> +      - items:
> +          - enum:
> +              - fsl,ls1012a-dspi
> +              - fsl,ls1028a-dspi
> +              - fsl,ls1043a-dspi
> +              - fsl,ls1046a-dspi
> +              - fsl,ls1088a-dspi
> +          - const: fsl,ls1021a-v1.0-dspi
> +      - items:
> +          - enum:
> +              - fsl,ls2080a-dspi
> +              - fsl,lx2160a-dspi
> +          - const: fsl,ls2085a-dspi
> +
> +  reg:
> +    maxItems: 1
> +    description: Offset and length of registers
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    items:
> +      - description: SoC dspi clock
> +
> +  clock-names:
> +    items:
> +      - const: dspi
> +
> +  pinctrl-names:
> +    minItems: 1
> +    items:
> +      - const: default
> +    description:
> +      Names for the pin configuration must be "default"
> +
> +  dmas:
> +    maxItems: 2
> +
> +  dma-names:
> +    items:
> +      - const: tx
> +      - const: rx
> +
> +  spi-num-chipselects:
> +    maxItems: 1
> +    description: Number of the chipselect signals
> +
> +  bus-num:
> +    items:
> +      - description: Slave chip chipselect signal number
> +
> +patternProperties:
> +  "@[0-9a-f]+":
> +    type: object
> +
> +    properties:
> +      fsl,spi-cs-sck-delay:
> +        description:
> +          Delay in nanoseconds between activating chip select and the start of
> +          clock signal, at the start of a transfer.
> +        $ref: /schemas/types.yaml#/definitions/uint32
> +
> +      fsl,spi-sck-cs-delay:
> +        description:
> +          Delay in nanoseconds between stopping the clock signal and
> +          deactivating chip select, at the end of a transfer.
> +        $ref: /schemas/types.yaml#/definitions/uint32
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clocks
> +  - clock-names
> +  - spi-num-chipselects
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/fsl,qoriq-clockgen.h>
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +
> +    soc {
> +        #address-cells = <2>;
> +        #size-cells = <2>;
> +
> +        spi@2100000 {
> +            compatible = "fsl,ls1028a-dspi", "fsl,ls1021a-v1.0-dspi";
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +            reg = <0x0 0x2100000 0x0 0x10000>;
> +            interrupts = <GIC_SPI 26 IRQ_TYPE_LEVEL_HIGH>;
> +            clock-names = "dspi";
> +            clocks = <&clockgen QORIQ_CLK_PLATFORM_PLL QORIQ_CLK_PLL_DIV(2)>;
> +            dmas = <&edma0 0 62>, <&edma0 0 60>;
> +            dma-names = "tx", "rx";
> +            spi-num-chipselects = <4>;
> +            little-endian;
> +
> +            flash@0 {
> +                compatible = "jedec,spi-nor";
> +                spi-max-frequency = <10000000>;
> +                reg = <0>;
> +            };
> +        };
> +    };
> diff --git a/Documentation/devicetree/bindings/spi/spi-fsl-dspi.txt b/Documentation/devicetree/bindings/spi/spi-fsl-dspi.txt
> deleted file mode 100644
> index 30a79da9c039..000000000000
> --- a/Documentation/devicetree/bindings/spi/spi-fsl-dspi.txt
> +++ /dev/null
> @@ -1,65 +0,0 @@
> -ARM Freescale DSPI controller
> -
> -Required properties:
> -- compatible : must be one of:
> -	"fsl,vf610-dspi",
> -	"fsl,ls1021a-v1.0-dspi",
> -	"fsl,ls1012a-dspi" (optionally followed by "fsl,ls1021a-v1.0-dspi"),
> -	"fsl,ls1028a-dspi",
> -	"fsl,ls1043a-dspi" (optionally followed by "fsl,ls1021a-v1.0-dspi"),
> -	"fsl,ls1046a-dspi" (optionally followed by "fsl,ls1021a-v1.0-dspi"),
> -	"fsl,ls1088a-dspi" (optionally followed by "fsl,ls1021a-v1.0-dspi"),
> -	"fsl,ls2080a-dspi" (optionally followed by "fsl,ls2085a-dspi"),
> -	"fsl,ls2085a-dspi",
> -	"fsl,lx2160a-dspi",
> -- reg : Offset and length of the register set for the device
> -- interrupts : Should contain SPI controller interrupt
> -- clocks: from common clock binding: handle to dspi clock.
> -- clock-names: from common clock binding: Shall be "dspi".
> -- pinctrl-0: pin control group to be used for this controller.
> -- pinctrl-names: must contain a "default" entry.
> -- spi-num-chipselects : the number of the chipselect signals.
> -
> -Optional property:
> -- big-endian: If present the dspi device's registers are implemented
> -  in big endian mode.
> -- bus-num : the slave chip chipselect signal number.
> -
> -Optional SPI slave node properties:
> -- fsl,spi-cs-sck-delay: a delay in nanoseconds between activating chip
> -  select and the start of clock signal, at the start of a transfer.
> -- fsl,spi-sck-cs-delay: a delay in nanoseconds between stopping the clock
> -  signal and deactivating chip select, at the end of a transfer.
> -
> -Example:
> -
> -dspi0@4002c000 {
> -	#address-cells = <1>;
> -	#size-cells = <0>;
> -	compatible = "fsl,vf610-dspi";
> -	reg = <0x4002c000 0x1000>;
> -	interrupts = <0 67 0x04>;
> -	clocks = <&clks VF610_CLK_DSPI0>;
> -	clock-names = "dspi";
> -	spi-num-chipselects = <5>;
> -	bus-num = <0>;
> -	pinctrl-names = "default";
> -	pinctrl-0 = <&pinctrl_dspi0_1>;
> -	big-endian;
> -
> -	sflash: at26df081a@0 {
> -		#address-cells = <1>;
> -		#size-cells = <1>;
> -		compatible = "atmel,at26df081a";
> -		spi-max-frequency = <16000000>;
> -		spi-cpol;
> -		spi-cpha;
> -		reg = <0>;
> -		linux,modalias = "m25p80";
> -		modal = "at26df081a";
> -		fsl,spi-cs-sck-delay = <100>;
> -		fsl,spi-sck-cs-delay = <50>;
> -	};
> -};
> -
> -
> diff --git a/MAINTAINERS b/MAINTAINERS
> index d92f85ca831d..e2c5b7367db9 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -7060,7 +7060,7 @@ FREESCALE DSPI DRIVER
>  M:	Vladimir Oltean <olteanv@gmail.com>
>  L:	linux-spi@vger.kernel.org
>  S:	Maintained
> -F:	Documentation/devicetree/bindings/spi/spi-fsl-dspi.txt
> +F:	Documentation/devicetree/bindings/spi/fsl,spi-fsl-dspi.yaml
>  F:	drivers/spi/spi-fsl-dspi.c
>  F:	include/linux/spi/spi-fsl-dspi.h
>  
> -- 
> 2.17.1
> 

-- 
Regards,
Pratyush Yadav
Texas Instruments Inc.

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RE: [EXT] Re: [PATCH] dt-bindings: spi: Convert Freescale DSPI to json schema

[Kuldeep Singh]

> -----Original Message-----
> From: Pratyush Yadav <p.yadav@ti.com>
> Sent: Tuesday, March 16, 2021 12:01 AM
> To: Kuldeep Singh <kuldeep.singh@nxp.com>
> Cc: linux-spi@vger.kernel.org; devicetree@vger.kernel.org; linux-
> kernel@vger.kernel.org; Mark Brown <broonie@kernel.org>; Rob Herring
> <robh+dt@kernel.org>; Vladimir Oltean <olteanv@gmail.com>; linux-
> mtd@lists.infradead.org
> Subject: [EXT] Re: [PATCH] dt-bindings: spi: Convert Freescale DSPI to json schema
> 
> Caution: EXT Email
> 
> +Cc mtd list
> 
> Hi,
> 
> On 15/03/21 05:45PM, Kuldeep Singh wrote:
> > Convert the Freescale DSPI binding to DT schema format using json-schema.
> >
> > Signed-off-by: Kuldeep Singh <kuldeep.singh@nxp.com>
> > ---
> > Hi Rob,
> > This patch is checked with following commands with no warnings observed.
> > make distclean; make allmodconfig;
> > make dt_binding_check
> > DT_SCHEMA_FILES=Documentation/devicetree/bindings/spi/fsl,spi-fsl-dspi
> > .yaml; make dtbs_check
> > DT_SCHEMA_FILES=Documentation/devicetree/bindings/spi/fsl,spi-fsl-dspi
> > .yaml
> 
> When I add the "fsl,spi-cs-sck-delay" property under the flash@0 node in the
> example and run dt_binding_check, I see the below error:
> 
>   /home/pratyush/src/linux/Documentation/devicetree/bindings/spi/fsl,spi-fsl-
> dspi.example.dt.yaml: flash@0: 'fsl,spi-cs-sck-delay' does not match any of the
> regexes: '^partition@', 'pinctrl-[0-9]+'
>      From schema:
> /home/pratyush/src/lin/Documentation/devicetree/bindings/mtd/jedec,spi-
> nor.yaml

Hi Pratyush,

Thanks for mentioning, I just noticed the same error after adding fsl,spi-cs-sck-delay property.
Since my example is not using the property, the error went unnoticed.

Taking example of nvidia qspi bindings i.e 
https://lore.kernel.org/linux-devicetree/1608585459-17250-3-git-send-email-skomatineni@nvidia.com/

I constructed other properties in similar fashion and later noticed that
example in nvidia bindings uses compatibes as "spi-nor" instead of "jedec,spi-nor"
and therefore passes "make dt_binding_check".

> I am trying to solve a similar problem for the Cadence QSPI controller binding and
> I wonder what the best solution for this is. The obvious one would be to add
> these properties to jedec,spi-nor.yaml. I haven't managed to come up with any
> other solution to this problem.

I agree with the solution to add properties in jedec,spi-nor.yaml and adding properties
particular to specific controllers for flashes in generic jedec,spi-nor.yaml may not be
a good solution though. Please let me know your views.

Other approach is to add these properties in same binding itself (if possible) so as 
to limit the scope of these properties. Looking forward for more suggestions.

Regards
Kuldeep

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Re: [PATCH] dt-bindings: spi: Convert Freescale DSPI to json schema

[Michael Walle]

Am 2021-03-15 19:30, schrieb Pratyush Yadav:

..
>> +patternProperties:
>> +  "@[0-9a-f]+":

Shouldn't this be "^.*@[0-9a-f]+$"?

>> +    type: object
>> +
>> +    properties:
>> +      fsl,spi-cs-sck-delay:
>> +        description:
>> +          Delay in nanoseconds between activating chip select and the 
>> start of
>> +          clock signal, at the start of a transfer.
>> +        $ref: /schemas/types.yaml#/definitions/uint32
>> +
>> +      fsl,spi-sck-cs-delay:
>> +        description:
>> +          Delay in nanoseconds between stopping the clock signal and
>> +          deactivating chip select, at the end of a transfer.
>> +        $ref: /schemas/types.yaml#/definitions/uint32
>> +
..

-michael

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Re: [PATCH] dt-bindings: spi: Convert Freescale DSPI to json schema

[Pratyush Yadav]

On 16/03/21 06:45PM, Michael Walle wrote:
> Am 2021-03-15 19:30, schrieb Pratyush Yadav:
> 
> ..
> > > +patternProperties:
> > > +  "@[0-9a-f]+":
> 
> Shouldn't this be "^.*@[0-9a-f]+$"?

The pattern has to match _anywhere_ in the string so both should match 
the flash node. Your pattern is more "strict" or "precise". See the note 
at [0].

[0] https://json-schema.org/understanding-json-schema/reference/string.html#regular-expressions

> 
> > > +    type: object
> > > +
> > > +    properties:
> > > +      fsl,spi-cs-sck-delay:
> > > +        description:
> > > +          Delay in nanoseconds between activating chip select and
> > > the start of
> > > +          clock signal, at the start of a transfer.
> > > +        $ref: /schemas/types.yaml#/definitions/uint32
> > > +
> > > +      fsl,spi-sck-cs-delay:
> > > +        description:
> > > +          Delay in nanoseconds between stopping the clock signal and
> > > +          deactivating chip select, at the end of a transfer.
> > > +        $ref: /schemas/types.yaml#/definitions/uint32
> > > +
> ..
> 
> -michael

-- 
Regards,
Pratyush Yadav
Texas Instruments Inc.

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Re: [PATCH] dt-bindings: spi: Convert Freescale DSPI to json schema

[Michael Walle]

Am 2021-03-16 19:06, schrieb Pratyush Yadav:
> On 16/03/21 06:45PM, Michael Walle wrote:
>> Am 2021-03-15 19:30, schrieb Pratyush Yadav:
>> 
>> ..
>> > > +patternProperties:
>> > > +  "@[0-9a-f]+":
>> 
>> Shouldn't this be "^.*@[0-9a-f]+$"?
> 
> The pattern has to match _anywhere_ in the string so both should match
> the flash node. Your pattern is more "strict" or "precise". See the 
> note
> at [0].

I know, but specifying the whole line is widely used in the bindings.

-michael

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Re: [PATCH] dt-bindings: spi: Convert Freescale DSPI to json schema

[Rob Herring]

On Tue, Mar 16, 2021 at 07:22:56PM +0100, Michael Walle wrote:
> Am 2021-03-16 19:06, schrieb Pratyush Yadav:
> > On 16/03/21 06:45PM, Michael Walle wrote:
> > > Am 2021-03-15 19:30, schrieb Pratyush Yadav:
> > > 
> > > ..
> > > > > +patternProperties:
> > > > > +  "@[0-9a-f]+":
> > > 
> > > Shouldn't this be "^.*@[0-9a-f]+$"?
> > 
> > The pattern has to match _anywhere_ in the string so both should match
> > the flash node. Your pattern is more "strict" or "precise". See the note
> > at [0].
> 
> I know, but specifying the whole line is widely used in the bindings.

It should be '@[0-9a-f]+$' which is equivalent to Michael's suggestion.

Rob

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Re: [PATCH] dt-bindings: spi: Convert Freescale DSPI to json schema

[Pratyush Yadav]

On 16/03/21 12:00AM, Pratyush Yadav wrote:
> +Cc mtd list
> 
> Hi,
> 
> On 15/03/21 05:45PM, Kuldeep Singh wrote:
> > Convert the Freescale DSPI binding to DT schema format using json-schema.
> > 
> > Signed-off-by: Kuldeep Singh <kuldeep.singh@nxp.com>
> > ---
> > Hi Rob,
> > This patch is checked with following commands with no warnings observed.
> > make distclean; make allmodconfig;
> > make dt_binding_check DT_SCHEMA_FILES=Documentation/devicetree/bindings/spi/fsl,spi-fsl-dspi.yaml;
> > make dtbs_check DT_SCHEMA_FILES=Documentation/devicetree/bindings/spi/fsl,spi-fsl-dspi.yaml
> 
> When I add the "fsl,spi-cs-sck-delay" property under the flash@0 node in 
> the example and run dt_binding_check, I see the below error:
> 
>   /home/pratyush/src/linux/Documentation/devicetree/bindings/spi/fsl,spi-fsl-dspi.example.dt.yaml: flash@0: 'fsl,spi-cs-sck-delay' does not match any of the regexes: '^partition@', 'pinctrl-[0-9]+'
>      From schema: /home/pratyush/src/lin/Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml
> 
> I am trying to solve a similar problem for the Cadence QSPI controller 
> binding and I wonder what the best solution for this is. The obvious one 
> would be to add these properties to jedec,spi-nor.yaml. I haven't 
> managed to come up with any other solution to this problem.
> 
> Rob, all, any suggestions on how to best model this?

Ping. Any ideas?

-- 
Regards,
Pratyush Yadav
Texas Instruments Inc.

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Re: [PATCH] dt-bindings: spi: Convert Freescale DSPI to json schema

[Rob Herring]

On Tue, Mar 16, 2021 at 12:00:52AM +0530, Pratyush Yadav wrote:
> +Cc mtd list
> 
> Hi,
> 
> On 15/03/21 05:45PM, Kuldeep Singh wrote:
> > Convert the Freescale DSPI binding to DT schema format using json-schema.
> > 
> > Signed-off-by: Kuldeep Singh <kuldeep.singh@nxp.com>
> > ---
> > Hi Rob,
> > This patch is checked with following commands with no warnings observed.
> > make distclean; make allmodconfig;
> > make dt_binding_check DT_SCHEMA_FILES=Documentation/devicetree/bindings/spi/fsl,spi-fsl-dspi.yaml;
> > make dtbs_check DT_SCHEMA_FILES=Documentation/devicetree/bindings/spi/fsl,spi-fsl-dspi.yaml
> 
> When I add the "fsl,spi-cs-sck-delay" property under the flash@0 node in 
> the example and run dt_binding_check, I see the below error:
> 
>   /home/pratyush/src/linux/Documentation/devicetree/bindings/spi/fsl,spi-fsl-dspi.example.dt.yaml: flash@0: 'fsl,spi-cs-sck-delay' does not match any of the regexes: '^partition@', 'pinctrl-[0-9]+'
>      From schema: /home/pratyush/src/lin/Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml
> 
> I am trying to solve a similar problem for the Cadence QSPI controller 
> binding and I wonder what the best solution for this is. The obvious one 
> would be to add these properties to jedec,spi-nor.yaml. I haven't 
> managed to come up with any other solution to this problem.
> 
> Rob, all, any suggestions on how to best model this?

I'm aware of the issue, but I don't have a solution for this situation. 
It's a problem anywhere we have a parent or bus binding defining 
properties for child nodes. For now, I'd just avoid it in the examples 
and we'll figure out how to deal with actual dts files later.

For this one in particular, CS to clock timing isn't any FSL or 
controller specific, but is device specific. So this probably should 
have been a generic spi bus property (if not implicit). That's somewhat 
easier to work-around than potentially adding controller specific 
properties to every slave device schema.

Rob

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