diff mbox series

[v4,06/28] dt-bindings: net: Add support for QMC HDLC

Message ID 817d1418fa1e9e689375177bee4bdc68ceeab7be.1692376361.git.christophe.leroy@csgroup.eu (mailing list archive)
State Changes Requested
Delegated to: Netdev Maintainers
Headers show
Series Add support for QMC HDLC, framer infrastruture and PEF2256 framer (v4) | expand

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Context Check Description
netdev/series_format fail Series longer than 15 patches (and no cover letter)
netdev/tree_selection success Guessed tree name to be net-next
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 9 this patch: 9
netdev/cc_maintainers success CCed 10 of 10 maintainers
netdev/build_clang success Errors and warnings before: 9 this patch: 9
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 9 this patch: 9
netdev/checkpatch warning WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Christophe Leroy Aug. 18, 2023, 4:39 p.m. UTC 
From: Herve Codina <herve.codina@bootlin.com>

The QMC (QUICC mutichannel controller) is a controller present in some
PowerQUICC SoC such as MPC885.
The QMC HDLC uses the QMC controller to transfer HDLC data.

Additionally, a framer can be connected to the QMC HDLC.
If present, this framer is the interface between the TDM bus used by the
QMC HDLC and the E1/T1 line.
The QMC HDLC can use this framer to get information about the E1/T1 line
and configure the E1/T1 line.

Signed-off-by: Herve Codina <herve.codina@bootlin.com>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
 .../devicetree/bindings/net/fsl,qmc-hdlc.yaml | 46 +++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/net/fsl,qmc-hdlc.yaml

Comments

Rob Herring Aug. 21, 2023, 8:42 p.m. UTC | #1 
On Fri, Aug 18, 2023 at 06:39:00PM +0200, Christophe Leroy wrote:
> From: Herve Codina <herve.codina@bootlin.com>
> 
> The QMC (QUICC mutichannel controller) is a controller present in some
> PowerQUICC SoC such as MPC885.
> The QMC HDLC uses the QMC controller to transfer HDLC data.
> 
> Additionally, a framer can be connected to the QMC HDLC.
> If present, this framer is the interface between the TDM bus used by the
> QMC HDLC and the E1/T1 line.
> The QMC HDLC can use this framer to get information about the E1/T1 line
> and configure the E1/T1 line.
> 
> Signed-off-by: Herve Codina <herve.codina@bootlin.com>
> Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
> ---
>  .../devicetree/bindings/net/fsl,qmc-hdlc.yaml | 46 +++++++++++++++++++
>  1 file changed, 46 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/net/fsl,qmc-hdlc.yaml
> 
> diff --git a/Documentation/devicetree/bindings/net/fsl,qmc-hdlc.yaml b/Documentation/devicetree/bindings/net/fsl,qmc-hdlc.yaml
> new file mode 100644
> index 000000000000..13f3572f0feb
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/fsl,qmc-hdlc.yaml
> @@ -0,0 +1,46 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/net/fsl,qmc-hdlc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Freescale/NXP QUICC Multichannel Controller (QMC) HDLC
> +
> +maintainers:
> +  - Herve Codina <herve.codina@bootlin.com>
> +
> +description: |

Don't need '|'

> +  The QMC HDLC uses a QMC (QUICC Multichannel Controller) channel to transfer
> +  HDLC data.
> +
> +properties:
> +  compatible:
> +    const: fsl,qmc-hdlc
> +
> +  fsl,qmc-chan:
> +    $ref: /schemas/types.yaml#/definitions/phandle-array
> +    items:
> +      - items:
> +          - description: phandle to QMC node
> +          - description: Channel number
> +    description:
> +      Should be a phandle/number pair. The phandle to QMC node and the QMC
> +      channel to use.
> +
> +  framer:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description:
> +      phandle to the framer node

What's the framer? 

> +
> +required:
> +  - compatible
> +  - fsl,qmc-chan
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    hdlc {
> +        compatible = "fsl,qmc-hdlc";
> +        fsl,qmc-chan = <&qmc 16>;

Where does this node live? 

QMC is this[1]? Why don't you just add the compatible to channel@10 in 
the QMC node?

Rob

[1] Documentation/devicetree/bindings/soc/fsl/cpm_qe/fsl,cpm1-scc-qmc.yaml
Herve Codina Aug. 24, 2023, 4:12 p.m. UTC | #2 
On Mon, 21 Aug 2023 15:42:58 -0500
Rob Herring <robh@kernel.org> wrote:

> On Fri, Aug 18, 2023 at 06:39:00PM +0200, Christophe Leroy wrote:
> > From: Herve Codina <herve.codina@bootlin.com>
> > 
> > The QMC (QUICC mutichannel controller) is a controller present in some
> > PowerQUICC SoC such as MPC885.
> > The QMC HDLC uses the QMC controller to transfer HDLC data.
> > 
> > Additionally, a framer can be connected to the QMC HDLC.
> > If present, this framer is the interface between the TDM bus used by the
> > QMC HDLC and the E1/T1 line.
> > The QMC HDLC can use this framer to get information about the E1/T1 line
> > and configure the E1/T1 line.
> > 
> > Signed-off-by: Herve Codina <herve.codina@bootlin.com>
> > Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
> > ---
> >  .../devicetree/bindings/net/fsl,qmc-hdlc.yaml | 46 +++++++++++++++++++
> >  1 file changed, 46 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/net/fsl,qmc-hdlc.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/net/fsl,qmc-hdlc.yaml b/Documentation/devicetree/bindings/net/fsl,qmc-hdlc.yaml
> > new file mode 100644
> > index 000000000000..13f3572f0feb
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/net/fsl,qmc-hdlc.yaml
> > @@ -0,0 +1,46 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/net/fsl,qmc-hdlc.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Freescale/NXP QUICC Multichannel Controller (QMC) HDLC
> > +
> > +maintainers:
> > +  - Herve Codina <herve.codina@bootlin.com>
> > +
> > +description: |  
> 
> Don't need '|'

Will be fixed in the next iteration.

> 
> > +  The QMC HDLC uses a QMC (QUICC Multichannel Controller) channel to transfer
> > +  HDLC data.
> > +
> > +properties:
> > +  compatible:
> > +    const: fsl,qmc-hdlc
> > +
> > +  fsl,qmc-chan:
> > +    $ref: /schemas/types.yaml#/definitions/phandle-array
> > +    items:
> > +      - items:
> > +          - description: phandle to QMC node
> > +          - description: Channel number
> > +    description:
> > +      Should be a phandle/number pair. The phandle to QMC node and the QMC
> > +      channel to use.
> > +
> > +  framer:
> > +    $ref: /schemas/types.yaml#/definitions/phandle
> > +    description:
> > +      phandle to the framer node  
> 
> What's the framer? 

A framer is a component in charge of an E1/T1 line interface.
Is is connected to the TDM bus and it converts TDM frames to/from E1/T1
frames.
The HDLC data are sent/received to/from the TDM bus and the framer is used to
get information about the E1/T1 line such as link up/down.

I can update the description to:
--- 8< ---
phandle to the framer node. The framer is in charge of an E1/T1 line
interface connected to the TDM bus. It can be used to get the E1/T1 line
status such as link up/down.
--- 8< ---

Is that better ?

> 
> > +
> > +required:
> > +  - compatible
> > +  - fsl,qmc-chan
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    hdlc {
> > +        compatible = "fsl,qmc-hdlc";
> > +        fsl,qmc-chan = <&qmc 16>;  
> 
> Where does this node live?
> 
> QMC is this[1]? Why don't you just add the compatible to channel@10 in 
> the QMC node?

Indeed, I will move the properties (compatible and framer phandle) to the
QMC channel node.

> 
> Rob
> 
> [1] Documentation/devicetree/bindings/soc/fsl/cpm_qe/fsl,cpm1-scc-qmc.yaml

Best regards,
Hervé
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/net/fsl,qmc-hdlc.yaml b/Documentation/devicetree/bindings/net/fsl,qmc-hdlc.yaml
new file mode 100644
index 000000000000..13f3572f0feb
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/fsl,qmc-hdlc.yaml
@@ -0,0 +1,46 @@ 
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/fsl,qmc-hdlc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Freescale/NXP QUICC Multichannel Controller (QMC) HDLC
+
+maintainers:
+  - Herve Codina <herve.codina@bootlin.com>
+
+description: |
+  The QMC HDLC uses a QMC (QUICC Multichannel Controller) channel to transfer
+  HDLC data.
+
+properties:
+  compatible:
+    const: fsl,qmc-hdlc
+
+  fsl,qmc-chan:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    items:
+      - items:
+          - description: phandle to QMC node
+          - description: Channel number
+    description:
+      Should be a phandle/number pair. The phandle to QMC node and the QMC
+      channel to use.
+
+  framer:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description:
+      phandle to the framer node
+
+required:
+  - compatible
+  - fsl,qmc-chan
+
+additionalProperties: false
+
+examples:
+  - |
+    hdlc {
+        compatible = "fsl,qmc-hdlc";
+        fsl,qmc-chan = <&qmc 16>;
+    };