RE: [EXT] Re: [PATCH V3 1/2] dt-bindings: fsl-imx-sdma: Convert imx sdma to DT schema

From: Joy Zou
Date: Tue Aug 30 2022 - 06:37:03 EST

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> -----Original Message-----
> From: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>
> Sent: 2022年8月30日 16:55
> To: Joy Zou <joy.zou@xxxxxxx>
> Cc: S.J. Wang <shengjiu.wang@xxxxxxx>; vkoul@xxxxxxxxxx;
> robh+dt@xxxxxxxxxx; krzysztof.kozlowski+dt@xxxxxxxxxx;
> shawnguo@xxxxxxxxxx; s.hauer@xxxxxxxxxxxxxx; kernel@xxxxxxxxxxxxxx;
> festevam@xxxxxxxxx; dl-linux-imx <linux-imx@xxxxxxx>;
> dmaengine@xxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx;
> linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
> Subject: [EXT] Re: [PATCH V3 1/2] dt-bindings: fsl-imx-sdma: Convert imx sdma
> to DT schema
>
> Caution: EXT Email
>
> On 30/08/2022 11:18, Joy Zou wrote:
> > Convert the i.MX SDMA binding to DT schema format using json-schema.
> > In addition, add new peripheral types HDMI Audio.
>
> Please wrap commit message according to Linux coding style / submission
> process:
I will modify commit message according to Linux coding style / submission process.
> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Felixir.bo
> otlin.com%2Flinux%2Fv5.18-rc4%2Fsource%2FDocumentation%2Fprocess%2F
> submitting-patches.rst%23L586&data=05%7C01%7Cjoy.zou%40nxp.com
> %7C55890065ef354208787208da8a65421d%7C686ea1d3bc2b4c6fa92cd99c
> 5c301635%7C0%7C0%7C637974464755794915%7CUnknown%7CTWFpbGZs
> b3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0
> %3D%7C3000%7C%7C%7C&sdata=STvcSCxL25DqsrApiYi4Ma%2FqsQebi
> MoXZqNWnjvHl9k%3D&reserved=0
>
> >
> > when run dtbs_check will occur nodename not match issue because the
> > old dts nodename can't match new rule. I have modified thoes old dts,
> > and will upstream in the near future.
>
> Please send it with this series.
I will prepare this series patch.
>
> >
> > Signed-off-by: Joy Zou <joy.zou@xxxxxxx>
> > ---
> > Changes since (implicit) v2:
> > modify the commit message in patch v3.
> > modify the filename in patch v3.
> > modify the maintainer in patch v3.
> > delete the unnecessary comment in patch v3.
> > modify the compatible and run dt_binding_check and dtbs_check in patch
> > v3.
> > add clocks and clock-names property in patch v3.
> > delete the reg description and add maxItems in patch v3.
> > delete the interrupts description and add maxItems in patch v3.
> > add ref for gpr property.
> > modify the fsl,sdma-event-remap ref type and add items in patch v3.
> > delete consumer example in patch v3.
> > ---
> > .../devicetree/bindings/dma/fsl,imx-sdma.yaml | 142
> > ++++++++++++++++++ .../devicetree/bindings/dma/fsl-imx-sdma.txt |
> > 118 ---------------
> > 2 files changed, 142 insertions(+), 118 deletions(-) create mode
> > 100644 Documentation/devicetree/bindings/dma/fsl,imx-sdma.yaml
> > delete mode 100644
> > Documentation/devicetree/bindings/dma/fsl-imx-sdma.txt
> >
> > diff --git a/Documentation/devicetree/bindings/dma/fsl,imx-sdma.yaml
> > b/Documentation/devicetree/bindings/dma/fsl,imx-sdma.yaml
> > new file mode 100644
> > index 000000000000..54cd99ae127f
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/dma/fsl,imx-sdma.yaml
> > @@ -0,0 +1,142 @@
> > +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause %YAML 1.2
> > +---
> > +$id:
> > +https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdevi
> >
> +cetree.org%2Fschemas%2Fdma%2Ffsl%2Cimx-sdma.yaml%23&data=05
> %7C01%
> >
> +7Cjoy.zou%40nxp.com%7C55890065ef354208787208da8a65421d%7C686ea
> 1d3bc2b
> >
> +4c6fa92cd99c5c301635%7C0%7C0%7C637974464755794915%7CUnknown
> %7CTWFpbGZ
> >
> +sb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6M
> n0%
> >
> +3D%7C3000%7C%7C%7C&sdata=G1H5konCS21TvDIYo9B46tXZTIpT86OV
> gO3pfRaT
> > +0%2F8%3D&reserved=0
> > +$schema:
> > +https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdevi
> >
> +cetree.org%2Fmeta-schemas%2Fcore.yaml%23&data=05%7C01%7Cjoy.z
> ou%4
> >
> +0nxp.com%7C55890065ef354208787208da8a65421d%7C686ea1d3bc2b4c6
> fa92cd99
> >
> +c5c301635%7C0%7C0%7C637974464755794915%7CUnknown%7CTWFpbG
> Zsb3d8eyJWIj
> >
> +oiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3
> 000%7
> >
> +C%7C%7C&sdata=NnDnwpVwextS4ygO9JM3jkLpAk19jHnI%2BJ%2FnW1
> sGzzk%3D&
> > +amp;reserved=0
> > +
> > +title: Freescale Smart Direct Memory Access (SDMA) Controller for
> > +i.MX
> > +
> > +maintainers:
> > + - Joy Zou <joy.zou@xxxxxxx>
> > +
> > +allOf:
> > + - $ref: "dma-controller.yaml#"
>
> Drop the quotes.
I will delete it.
>
> > +
> > +properties:
> > + compatible:
> > + oneOf:
> > + - items:
> > + - enum:
> > + - fsl,imx50-sdma
> > + - fsl,imx51-sdma
> > + - fsl,imx53-sdma
> > + - fsl,imx6q-sdma
> > + - fsl,imx7d-sdma
> > + - const: fsl,imx35-sdma
>
> What happened to fsl,imx35-to1-sdma and others? This does not look like pure
> conversion and your commit msg did not explain differences to the binding.
>
I have checked fsl,imx35-to1-sdma and others that don't are used, so delete item.
I am sorry, the difference description was omitted, I will add in patch v4.
> > + - items:
> > + - enum:
> > + - fsl,imx6sx-sdma
> > + - fsl,imx6ul-sdma
> > + - fsl,imx6sl-sdma
> > + - const: fsl,imx6q-sdma
>
> All this also differ from original binding, so describe the reason behind the
> changes.
The original binding only list partial compatible name, but not describe the relation
between compatible. I list different cases in order to describe the platform relation
and difference. I will add in patch v4.
>
> > + - items:
> > + - const: fsl,imx6ul-sdma
> > + - const: fsl,imx6q-sdma
> > + - const: fsl,imx35-sdma
>
> You have fsl,imx6ul-sdma above so this is duplicating stuff. I am sorry but this
> looks very odd.
I will delete it and modify the dts in patch v4.
>
>
> > + - items:
> > + - const: fsl,imx6sll-sdma
> > + - const: fsl,imx6ul-sdma
> > + - items:
> > + - const: fsl,imx8mq-sdma
> > + - const: fsl,imx7d-sdma
> > + - items:
> > + - enum:
> > + - fsl,imx8mp-sdma
> > + - fsl,imx8mn-sdma
> > + - fsl,imx8mm-sdma
> > + - const: fsl,imx8mq-sdma
> > + - items:
> > + - const: fsl,imx25-sdma
> > + - items:
> > + - const: fsl,imx31-sdma
> > + - items:
> > + - const: fsl,imx35-sdma
>
> All these three last entries are not "items", but one enum.
I will change items into enum in patch v4.
>
> > + reg:
> > + maxItems: 1
> > +
> > + interrupts:
> > + maxItems: 1
> > +
> > + fsl,sdma-ram-script-name:
> > + $ref: /schemas/types.yaml#/definitions/string
> > + description: Should contain the full path of SDMA RAM scripts
> firmware.
> > +
> > + "#dma-cells":
> > + const: 3
> > + description: |
> > + The first cell: request/event ID
> > +
> > + The second cell: peripheral types ID
> > + enum:
> > + - MCU domain SSI: 0
> > + - Shared SSI: 1
> > + - MMC: 2
> > + - SDHC: 3
> > + - MCU domain UART: 4
> > + - Shared UART: 5
> > + - FIRI: 6
> > + - MCU domain CSPI: 7
> > + - Shared CSPI: 8
> > + - SIM: 9
> > + - ATA: 10
> > + - CCM: 11
> > + - External peripheral: 12
> > + - Memory Stick Host Controller: 13
> > + - Shared Memory Stick Host Controller: 14
> > + - DSP: 15
> > + - Memory: 16
> > + - FIFO type Memory: 17
> > + - SPDIF: 18
> > + - IPU Memory: 19
> > + - ASRC: 20
> > + - ESAI: 21
> > + - SSI Dual FIFO: 22
> > + description: needs firmware more than ver 2
> > + - Shared ASRC: 23
> > + - SAI: 24
> > + - HDMI Audio: 25
> > +
> > + The third cell: transfer priority ID
> > + enum:
> > + - High: 0
> > + - Medium: 1
> > + - Low: 2
> > +
> > + gpr:
> > + $ref: /schemas/types.yaml#/definitions/phandle
> > + description: The phandle to the General Purpose Register (GPR)
> > + node
> > +
> > + fsl,sdma-event-remap:
> > + $ref: /schemas/types.yaml#/definitions/uint32-matrix
> > + items:
> > + - description: The GPR register offset, shift and value for RX
> > + - description: The GPR register offset, shift and value for TX
> > + description: |
> > + Register bits of sdma event remap, the format is <reg shift val>.
> > +
> > + clocks:
> > + maxItems: 2
> > +
> > + clock-names:
> > + maxItems: 2
>
> You need to list the items and if they are non-obvious also describe them in
> clocks.
I will add items and description in patch v4.
Thank you very much for your effort to provide valuable and important comments on my patch.
BR
Joy Zou
>
> > diff --git a/Documentation/devicetree/bindings/dma/fsl-imx-sdma.txt
> > b/Documentation/devicetree/bindings/dma/fsl-imx-sdma.txt
> > deleted file mode 100644
> > index 12c316ff4834..000000000000
> > --- a/Documentation/devicetree/bindings/dma/fsl-imx-sdma.txt
> > +++ /dev/null
> > @@ -1,118 +0,0 @@
> > -* Freescale Smart Direct Memory Access (SDMA) Controller for i.MX
> > -
> > -Required properties:
> > -- compatible : Should be one of
> > - "fsl,imx25-sdma"
> > - "fsl,imx31-sdma", "fsl,imx31-to1-sdma", "fsl,imx31-to2-sdma"
> > - "fsl,imx35-sdma", "fsl,imx35-to1-sdma", "fsl,imx35-to2-sdma"
> > - "fsl,imx51-sdma"
> > - "fsl,imx53-sdma"
> > - "fsl,imx6q-sdma"
> > - "fsl,imx7d-sdma"
> > - "fsl,imx6ul-sdma"
> > - "fsl,imx8mq-sdma"
> > - "fsl,imx8mm-sdma"
> > - "fsl,imx8mn-sdma"
> > - "fsl,imx8mp-sdma"
> > - The -to variants should be preferred since they allow to determine
> > the
> > - correct ROM script addresses needed for the driver to work without
> > additional
> > - firmware.
> > -- reg : Should contain SDMA registers location and length
> > -- interrupts : Should contain SDMA interrupt
> > -- #dma-cells : Must be <3>.
> > - The first cell specifies the DMA request/event ID. See details
> > below
> > - about the second and third cell.
> > -- fsl,sdma-ram-script-name : Should contain the full path of SDMA RAM
> > - scripts firmware
> > -
> > -The second cell of dma phandle specifies the peripheral type of DMA
> transfer.
> > -The full ID of peripheral types can be found below.
> > -
> > - ID transfer type
> > - ---------------------
> > - 0 MCU domain SSI
> > - 1 Shared SSI
> > - 2 MMC
> > - 3 SDHC
> > - 4 MCU domain UART
> > - 5 Shared UART
> > - 6 FIRI
> > - 7 MCU domain CSPI
> > - 8 Shared CSPI
> > - 9 SIM
> > - 10 ATA
> > - 11 CCM
> > - 12 External peripheral
> > - 13 Memory Stick Host Controller
> > - 14 Shared Memory Stick Host Controller
> > - 15 DSP
> > - 16 Memory
> > - 17 FIFO type Memory
> > - 18 SPDIF
> > - 19 IPU Memory
> > - 20 ASRC
> > - 21 ESAI
> > - 22 SSI Dual FIFO (needs firmware ver >= 2)
> > - 23 Shared ASRC
> > - 24 SAI
> > -
> > -The third cell specifies the transfer priority as below.
> > -
> > - ID transfer priority
> > - -------------------------
> > - 0 High
> > - 1 Medium
> > - 2 Low
> > -
> > -Optional properties:
> > -
> > -- gpr : The phandle to the General Purpose Register (GPR) node.
> > -- fsl,sdma-event-remap : Register bits of sdma event remap, the
> > format is
> > - <reg shift val>.
> > - reg is the GPR register offset.
> > - shift is the bit position inside the GPR register.
> > - val is the value of the bit (0 or 1).
> > -
> > -Examples:
> > -
> > -sdma@83fb0000 {
> > - compatible = "fsl,imx51-sdma", "fsl,imx35-sdma";
> > - reg = <0x83fb0000 0x4000>;
> > - interrupts = <6>;
> > - #dma-cells = <3>;
> > - fsl,sdma-ram-script-name = "sdma-imx51.bin";
> > -};
> > -
> > -DMA clients connected to the i.MX SDMA controller must use the format
> > -described in the dma.txt file.
> > -
> > -Examples:
> > -
> > -ssi2: ssi@70014000 {
> > - compatible = "fsl,imx51-ssi", "fsl,imx21-ssi";
> > - reg = <0x70014000 0x4000>;
> > - interrupts = <30>;
> > - clocks = <&clks 49>;
> > - dmas = <&sdma 24 1 0>,
> > - <&sdma 25 1 0>;
> > - dma-names = "rx", "tx";
> > - fsl,fifo-depth = <15>;
> > -};
> > -
> > -Using the fsl,sdma-event-remap property:
> > -
> > -If we want to use SDMA on the SAI1 port on a MX6SX:
> > -
> > -&sdma {
> > - gpr = <&gpr>;
> > - /* SDMA events remap for SAI1_RX and SAI1_TX */
> > - fsl,sdma-event-remap = <0 15 1>, <0 16 1>;
> > -};
> > -
> > -The fsl,sdma-event-remap property in this case has two values:
> > -- <0 15 1> means that the offset is 0, so GPR0 is the register of the
> > -SDMA remap. Bit 15 of GPR0 selects between UART4_RX and SAI1_RX.
> > -Setting bit 15 to 1 selects SAI1_RX.
> > -- <0 16 1> means that the offset is 0, so GPR0 is the register of the
> > -SDMA remap. Bit 16 of GPR0 selects between UART4_TX and SAI1_TX.
> > -Setting bit 16 to 1 selects SAI1_TX.
>
> Include such text in fsl,sdma-event-remap description.
>
> Best regards,
> Krzysztof

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