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Message-ID: <86dc965c-002c-49f1-b419-49c719e388ac@csgroup.eu>
Date: Fri, 23 Aug 2024 10:05:24 +0200
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: Herve Codina <herve.codina@...tlin.com>, Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
<conor+dt@...nel.org>, Qiang Zhao <qiang.zhao@....com>,
Li Yang <leoyang.li@....com>, Mark Brown <broonie@...nel.org>
Cc: linuxppc-dev@...ts.ozlabs.org, linux-arm-kernel@...ts.infradead.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v2 07/36] dt-bindings: soc: fsl: cpm_qe: Add QUICC Engine
(QE) TSA controller
Le 08/08/2024 à 09:11, Herve Codina a écrit :
> Add support for the time slot assigner (TSA) available in some
> PowerQUICC SoC that uses a QUICC Engine (QE) block such as MPC8321.
>
> This QE TSA is similar to the CPM TSA except that it uses UCCs (Unified
> Communication Controllers) instead of SCCs (Serial Communication
> Controllers). Also, compared against the CPM TSA, this QE TSA can handle
> up to 4 TDMs instead of 2 and allows to configure the logic level of
> sync signals.
>
> Signed-off-by: Herve Codina <herve.codina@...tlin.com>
Reviewed-by: Christophe Leroy <christophe.leroy@...roup.eu>
> ---
> .../bindings/soc/fsl/cpm_qe/fsl,qe-tsa.yaml | 210 ++++++++++++++++++
> include/dt-bindings/soc/qe-fsl,tsa.h | 13 ++
> 2 files changed, 223 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/soc/fsl/cpm_qe/fsl,qe-tsa.yaml
> create mode 100644 include/dt-bindings/soc/qe-fsl,tsa.h
>
> diff --git a/Documentation/devicetree/bindings/soc/fsl/cpm_qe/fsl,qe-tsa.yaml b/Documentation/devicetree/bindings/soc/fsl/cpm_qe/fsl,qe-tsa.yaml
> new file mode 100644
> index 000000000000..3b50e0a003ca
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/fsl/cpm_qe/fsl,qe-tsa.yaml
> @@ -0,0 +1,210 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/soc/fsl/cpm_qe/fsl,qe-tsa.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: PowerQUICC QE Time-slot assigner (TSA) controller
> +
> +maintainers:
> + - Herve Codina <herve.codina@...tlin.com>
> +
> +description:
> + The TSA is the time-slot assigner that can be found on some PowerQUICC SoC.
> + Its purpose is to route some TDM time-slots to other internal serial
> + controllers.
> +
> +properties:
> + compatible:
> + items:
> + - enum:
> + - fsl,mpc8321-tsa
> + - const: fsl,qe-tsa
> +
> + reg:
> + items:
> + - description: SI (Serial Interface) register base
> + - description: SI RAM base
> +
> + reg-names:
> + items:
> + - const: si_regs
> + - const: si_ram
> +
> + '#address-cells':
> + const: 1
> +
> + '#size-cells':
> + const: 0
> +
> +patternProperties:
> + '^tdm@[0-3]$':
> + description:
> + The TDM managed by this controller
> + type: object
> +
> + additionalProperties: false
> +
> + properties:
> + reg:
> + minimum: 0
> + maximum: 3
> + description:
> + The TDM number for this TDM, 0 for TDMa, 1 for TDMb, 2 for TDMc and 3
> + for TDMd.
> +
> + fsl,common-rxtx-pins:
> + $ref: /schemas/types.yaml#/definitions/flag
> + description:
> + The hardware can use four dedicated pins for Tx clock, Tx sync, Rx
> + clock and Rx sync or use only two pins, Tx/Rx clock and Tx/Rx sync.
> + Without the 'fsl,common-rxtx-pins' property, the four pins are used.
> + With the 'fsl,common-rxtx-pins' property, two pins are used.
> +
> + clocks:
> + minItems: 2
> + items:
> + - description: Receive sync clock
> + - description: Receive data clock
> + - description: Transmit sync clock
> + - description: Transmit data clock
> +
> + clock-names:
> + minItems: 2
> + items:
> + - const: rsync
> + - const: rclk
> + - const: tsync
> + - const: tclk
> +
> + fsl,rx-frame-sync-delay-bits:
> + enum: [0, 1, 2, 3]
> + default: 0
> + description: |
> + Receive frame sync delay in number of bits.
> + Indicates the delay between the Rx sync and the first bit of the Rx
> + frame.
> +
> + fsl,tx-frame-sync-delay-bits:
> + enum: [0, 1, 2, 3]
> + default: 0
> + description: |
> + Transmit frame sync delay in number of bits.
> + Indicates the delay between the Tx sync and the first bit of the Tx
> + frame.
> +
> + fsl,clock-falling-edge:
> + $ref: /schemas/types.yaml#/definitions/flag
> + description:
> + Data is sent on falling edge of the clock (and received on the rising
> + edge). If not present, data is sent on the rising edge (and received
> + on the falling edge).
> +
> + fsl,fsync-rising-edge:
> + $ref: /schemas/types.yaml#/definitions/flag
> + description:
> + Frame sync pulses are sampled with the rising edge of the channel
> + clock. If not present, pulses are sampled with the falling edge.
> +
> + fsl,fsync-active-low:
> + $ref: /schemas/types.yaml#/definitions/flag
> + description:
> + Frame sync signals are active on low logic level.
> + If not present, sync signals are active on high level.
> +
> + fsl,double-speed-clock:
> + $ref: /schemas/types.yaml#/definitions/flag
> + description:
> + The channel clock is twice the data rate.
> +
> + patternProperties:
> + '^fsl,[rt]x-ts-routes$':
> + $ref: /schemas/types.yaml#/definitions/uint32-matrix
> + description: |
> + A list of tuple that indicates the Tx or Rx time-slots routes.
> + items:
> + items:
> + - description:
> + The number of time-slots
> + minimum: 1
> + maximum: 64
> + - description: |
> + The source (Tx) or destination (Rx) serial interface
> + (dt-bindings/soc/qe-fsl,tsa.h defines these values)
> + - 0: No destination
> + - 1: UCC1
> + - 2: UCC2
> + - 3: UCC3
> + - 4: UCC4
> + - 5: UCC5
> + enum: [0, 1, 2, 3, 4, 5]
> + minItems: 1
> + maxItems: 64
> +
> + allOf:
> + # If fsl,common-rxtx-pins is present, only 2 clocks are needed.
> + # Else, the 4 clocks must be present.
> + - if:
> + required:
> + - fsl,common-rxtx-pins
> + then:
> + properties:
> + clocks:
> + maxItems: 2
> + clock-names:
> + maxItems: 2
> + else:
> + properties:
> + clocks:
> + minItems: 4
> + clock-names:
> + minItems: 4
> +
> + required:
> + - reg
> + - clocks
> + - clock-names
> +
> +required:
> + - compatible
> + - reg
> + - reg-names
> + - '#address-cells'
> + - '#size-cells'
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + #include <dt-bindings/soc/qe-fsl,tsa.h>
> +
> + tsa@ae0 {
> + compatible = "fsl,mpc8321-tsa", "fsl,qe-tsa";
> + reg = <0xae0 0x10>,
> + <0xc00 0x200>;
> + reg-names = "si_regs", "si_ram";
> +
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + tdm@0 {
> + /* TDMa */
> + reg = <0>;
> +
> + clocks = <&clk_l1rsynca>, <&clk_l1rclka>;
> + clock-names = "rsync", "rclk";
> +
> + fsl,common-rxtx-pins;
> + fsl,fsync-rising-edge;
> +
> + fsl,tx-ts-routes = <2 0>, /* TS 0..1 */
> + <24 FSL_QE_TSA_UCC4>, /* TS 2..25 */
> + <1 0>, /* TS 26 */
> + <5 FSL_QE_TSA_UCC3>; /* TS 27..31 */
> +
> + fsl,rx-ts-routes = <2 0>, /* TS 0..1 */
> + <24 FSL_QE_TSA_UCC4>, /* 2..25 */
> + <1 0>, /* TS 26 */
> + <5 FSL_QE_TSA_UCC3>; /* TS 27..31 */
> + };
> + };
> diff --git a/include/dt-bindings/soc/qe-fsl,tsa.h b/include/dt-bindings/soc/qe-fsl,tsa.h
> new file mode 100644
> index 000000000000..3cf3df9c0968
> --- /dev/null
> +++ b/include/dt-bindings/soc/qe-fsl,tsa.h
> @@ -0,0 +1,13 @@
> +/* SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause */
> +
> +#ifndef __DT_BINDINGS_SOC_FSL_QE_TSA_H
> +#define __DT_BINDINGS_SOC_FSL_QE_TSA_H
> +
> +#define FSL_QE_TSA_NU 0
> +#define FSL_QE_TSA_UCC1 1
> +#define FSL_QE_TSA_UCC2 2
> +#define FSL_QE_TSA_UCC3 3
> +#define FSL_QE_TSA_UCC4 4
> +#define FSL_QE_TSA_UCC5 5
> +
> +#endif
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