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Date: Tue, 30 Aug 2022 11:54:30 +0300
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Joy Zou <joy.zou@....com>
Cc: shengjiu.wang@....com, vkoul@...nel.org, robh+dt@...nel.org,
krzysztof.kozlowski+dt@...aro.org, shawnguo@...nel.org,
s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
linux-imx@....com, dmaengine@...r.kernel.org,
devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3 1/2] dt-bindings: fsl-imx-sdma: Convert imx sdma to DT
schema
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:
https://elixir.bootlin.com/linux/v5.18-rc4/source/Documentation/process/submitting-patches.rst#L586
>
> 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.
>
> Signed-off-by: Joy Zou <joy.zou@....com>
> ---
> 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
> +---
> +$id: http://devicetree.org/schemas/dma/fsl,imx-sdma.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Freescale Smart Direct Memory Access (SDMA) Controller for i.MX
> +
> +maintainers:
> + - Joy Zou <joy.zou@....com>
> +
> +allOf:
> + - $ref: "dma-controller.yaml#"
Drop the quotes.
> +
> +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.
> + - 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.
> + - 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.
> + - 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.
> + 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.
> 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@...b0000 {
> - 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@...14000 {
> - 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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