Add documentation of device tree bindings for the STM32 basic extended
CAN (bxcan) controller.
Signed-off-by: Dario Binacchi <dariobin@libero.it>
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
---
Changes in v2:
- Change the file name into 'st,stm32-bxcan-core.yaml'.
- Rename compatibles:
- st,stm32-bxcan-core -> st,stm32f4-bxcan-core
- st,stm32-bxcan -> st,stm32f4-bxcan
- Rename master property to st,can-master.
- Remove the status property from the example.
- Put the node child properties as required.
.../bindings/net/can/st,stm32-bxcan.yaml | 136 ++++++++++++++++++
1 file changed, 136 insertions(+)
create mode 100644 Documentation/devicetree/bindings/net/can/st,stm32-bxcan.yaml
diff --git a/Documentation/devicetree/bindings/net/can/st,stm32-bxcan.yaml b/Documentation/devicetree/bindings/net/can/st,stm32-bxcan.yaml
new file mode 100644
index 000000000000..288631b5556d
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/can/st,stm32-bxcan.yaml
@@ -0,0 +1,136 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/can/st,stm32-bxcan.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: STMicroelectronics bxCAN controller
+
+description: STMicroelectronics BxCAN controller for CAN bus
+
+maintainers:
+ - Dario Binacchi <dario.binacchi@amarulasolutions.com>
+
+allOf:
+ - $ref: can-controller.yaml#
+
+properties:
+ compatible:
+ enum:
+ - st,stm32f4-bxcan-core
+
+ reg:
+ maxItems: 1
+
+ resets:
+ maxItems: 1
+
+ clocks:
+ description:
+ Input clock for registers access
+ maxItems: 1
+
+ '#address-cells':
+ const: 1
+
+ '#size-cells':
+ const: 0
+
+additionalProperties: false
+
+required:
+ - compatible
+ - reg
+ - resets
+ - clocks
+ - '#address-cells'
+ - '#size-cells'
+
+patternProperties:
+ "^can@[0-9]+$":
+ type: object
+ description:
+ A CAN block node contains two subnodes, representing each one a CAN
+ instance available on the machine.
+
+ properties:
+ compatible:
+ enum:
+ - st,stm32f4-bxcan
+
+ st,can-master:
+ description:
+ Master and slave mode of the bxCAN peripheral is only relevant
+ if the chip has two CAN peripherals. In that case they share
+ some of the required logic, and that means you cannot use the
+ slave CAN without the master CAN.
+ type: boolean
+
+ reg:
+ description: |
+ Offset of CAN instance in CAN block. Valid values are:
+ - 0x0: CAN1
+ - 0x400: CAN2
+ maxItems: 1
+
+ interrupts:
+ items:
+ - description: transmit interrupt
+ - description: FIFO 0 receive interrupt
+ - description: FIFO 1 receive interrupt
+ - description: status change error interrupt
+
+ interrupt-names:
+ items:
+ - const: tx
+ - const: rx0
+ - const: rx1
+ - const: sce
+
+ resets:
+ maxItems: 1
+
+ clocks:
+ description:
+ Input clock for registers access
+ maxItems: 1
+
+ additionalProperties: false
+
+ required:
+ - compatible
+ - reg
+ - interrupts
+ - resets
+
+examples:
+ - |
+ #include <dt-bindings/clock/stm32fx-clock.h>
+ #include <dt-bindings/mfd/stm32f4-rcc.h>
+
+ can: can@40006400 {
+ compatible = "st,stm32f4-bxcan-core";
+ reg = <0x40006400 0x800>;
+ resets = <&rcc STM32F4_APB1_RESET(CAN1)>;
+ clocks = <&rcc 0 STM32F4_APB1_CLOCK(CAN1)>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ can1: can@0 {
+ compatible = "st,stm32f4-bxcan";
+ reg = <0x0>;
+ interrupts = <19>, <20>, <21>, <22>;
+ interrupt-names = "tx", "rx0", "rx1", "sce";
+ resets = <&rcc STM32F4_APB1_RESET(CAN1)>;
+ st,can-master;
+ };
+
+ can2: can@400 {
+ compatible = "st,stm32f4-bxcan";
+ reg = <0x400>;
+ interrupts = <63>, <64>, <65>, <66>;
+ interrupt-names = "tx", "rx0", "rx1", "sce";
+ resets = <&rcc STM32F4_APB1_RESET(CAN2)>;
+ clocks = <&rcc 0 STM32F4_APB1_CLOCK(CAN2)>;
+ };
+ };
--
2.32.0On Sat, Aug 20, 2022 at 10:29:33AM +0200, Dario Binacchi wrote:
> Add documentation of device tree bindings for the STM32 basic extended
> CAN (bxcan) controller.
>
> Signed-off-by: Dario Binacchi <dariobin@libero.it>
> Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
>
> ---
>
> Changes in v2:
> - Change the file name into 'st,stm32-bxcan-core.yaml'.
> - Rename compatibles:
> - st,stm32-bxcan-core -> st,stm32f4-bxcan-core
> - st,stm32-bxcan -> st,stm32f4-bxcan
> - Rename master property to st,can-master.
> - Remove the status property from the example.
> - Put the node child properties as required.
>
> .../bindings/net/can/st,stm32-bxcan.yaml | 136 ++++++++++++++++++
> 1 file changed, 136 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/net/can/st,stm32-bxcan.yaml
>
> diff --git a/Documentation/devicetree/bindings/net/can/st,stm32-bxcan.yaml b/Documentation/devicetree/bindings/net/can/st,stm32-bxcan.yaml
> new file mode 100644
> index 000000000000..288631b5556d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/can/st,stm32-bxcan.yaml
> @@ -0,0 +1,136 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/net/can/st,stm32-bxcan.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: STMicroelectronics bxCAN controller
> +
> +description: STMicroelectronics BxCAN controller for CAN bus
> +
> +maintainers:
> + - Dario Binacchi <dario.binacchi@amarulasolutions.com>
> +
> +allOf:
> + - $ref: can-controller.yaml#
> +
> +properties:
> + compatible:
> + enum:
> + - st,stm32f4-bxcan-core
> +
> + reg:
> + maxItems: 1
> +
> + resets:
> + maxItems: 1
> +
> + clocks:
> + description:
> + Input clock for registers access
> + maxItems: 1
> +
> + '#address-cells':
> + const: 1
> +
> + '#size-cells':
> + const: 0
> +
> +additionalProperties: false
> +
> +required:
> + - compatible
> + - reg
> + - resets
> + - clocks
> + - '#address-cells'
> + - '#size-cells'
> +
> +patternProperties:
> + "^can@[0-9]+$":
> + type: object
> + description:
> + A CAN block node contains two subnodes, representing each one a CAN
> + instance available on the machine.
> +
> + properties:
> + compatible:
> + enum:
> + - st,stm32f4-bxcan
> +
> + st,can-master:
> + description:
> + Master and slave mode of the bxCAN peripheral is only relevant
> + if the chip has two CAN peripherals. In that case they share
> + some of the required logic, and that means you cannot use the
> + slave CAN without the master CAN.
> + type: boolean
> +
> + reg:
> + description: |
> + Offset of CAN instance in CAN block. Valid values are:
> + - 0x0: CAN1
> + - 0x400: CAN2
> + maxItems: 1
> +
> + interrupts:
> + items:
> + - description: transmit interrupt
> + - description: FIFO 0 receive interrupt
> + - description: FIFO 1 receive interrupt
> + - description: status change error interrupt
> +
> + interrupt-names:
> + items:
> + - const: tx
> + - const: rx0
> + - const: rx1
> + - const: sce
> +
> + resets:
> + maxItems: 1
> +
> + clocks:
> + description:
> + Input clock for registers access
> + maxItems: 1
> +
> + additionalProperties: false
> +
> + required:
> + - compatible
> + - reg
> + - interrupts
> + - resets
> +
> +examples:
> + - |
> + #include <dt-bindings/clock/stm32fx-clock.h>
> + #include <dt-bindings/mfd/stm32f4-rcc.h>
> +
> + can: can@40006400 {
> + compatible = "st,stm32f4-bxcan-core";
> + reg = <0x40006400 0x800>;
> + resets = <&rcc STM32F4_APB1_RESET(CAN1)>;
> + clocks = <&rcc 0 STM32F4_APB1_CLOCK(CAN1)>;
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
Missing 'ranges'.
> + can1: can@0 {
> + compatible = "st,stm32f4-bxcan";
> + reg = <0x0>;
> + interrupts = <19>, <20>, <21>, <22>;
> + interrupt-names = "tx", "rx0", "rx1", "sce";
> + resets = <&rcc STM32F4_APB1_RESET(CAN1)>;
> + st,can-master;
No clocks?
> + };
> +
> + can2: can@400 {
> + compatible = "st,stm32f4-bxcan";
> + reg = <0x400>;
> + interrupts = <63>, <64>, <65>, <66>;
> + interrupt-names = "tx", "rx0", "rx1", "sce";
> + resets = <&rcc STM32F4_APB1_RESET(CAN2)>;
> + clocks = <&rcc 0 STM32F4_APB1_CLOCK(CAN2)>;
> + };
> + };
> --
> 2.32.0
>
>
Hi Rob,
On Thu, Aug 25, 2022 at 11:12 PM Rob Herring <robh@kernel.org> wrote:
>
> On Sat, Aug 20, 2022 at 10:29:33AM +0200, Dario Binacchi wrote:
> > Add documentation of device tree bindings for the STM32 basic extended
> > CAN (bxcan) controller.
> >
> > Signed-off-by: Dario Binacchi <dariobin@libero.it>
> > Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
> >
> > ---
> >
> > Changes in v2:
> > - Change the file name into 'st,stm32-bxcan-core.yaml'.
> > - Rename compatibles:
> > - st,stm32-bxcan-core -> st,stm32f4-bxcan-core
> > - st,stm32-bxcan -> st,stm32f4-bxcan
> > - Rename master property to st,can-master.
> > - Remove the status property from the example.
> > - Put the node child properties as required.
> >
> > .../bindings/net/can/st,stm32-bxcan.yaml | 136 ++++++++++++++++++
> > 1 file changed, 136 insertions(+)
> > create mode 100644 Documentation/devicetree/bindings/net/can/st,stm32-bxcan.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/net/can/st,stm32-bxcan.yaml b/Documentation/devicetree/bindings/net/can/st,stm32-bxcan.yaml
> > new file mode 100644
> > index 000000000000..288631b5556d
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/net/can/st,stm32-bxcan.yaml
> > @@ -0,0 +1,136 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/net/can/st,stm32-bxcan.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: STMicroelectronics bxCAN controller
> > +
> > +description: STMicroelectronics BxCAN controller for CAN bus
> > +
> > +maintainers:
> > + - Dario Binacchi <dario.binacchi@amarulasolutions.com>
> > +
> > +allOf:
> > + - $ref: can-controller.yaml#
> > +
> > +properties:
> > + compatible:
> > + enum:
> > + - st,stm32f4-bxcan-core
> > +
> > + reg:
> > + maxItems: 1
> > +
> > + resets:
> > + maxItems: 1
> > +
> > + clocks:
> > + description:
> > + Input clock for registers access
> > + maxItems: 1
> > +
> > + '#address-cells':
> > + const: 1
> > +
> > + '#size-cells':
> > + const: 0
> > +
> > +additionalProperties: false
> > +
> > +required:
> > + - compatible
> > + - reg
> > + - resets
> > + - clocks
> > + - '#address-cells'
> > + - '#size-cells'
> > +
> > +patternProperties:
> > + "^can@[0-9]+$":
> > + type: object
> > + description:
> > + A CAN block node contains two subnodes, representing each one a CAN
> > + instance available on the machine.
> > +
> > + properties:
> > + compatible:
> > + enum:
> > + - st,stm32f4-bxcan
> > +
> > + st,can-master:
> > + description:
> > + Master and slave mode of the bxCAN peripheral is only relevant
> > + if the chip has two CAN peripherals. In that case they share
> > + some of the required logic, and that means you cannot use the
> > + slave CAN without the master CAN.
> > + type: boolean
> > +
> > + reg:
> > + description: |
> > + Offset of CAN instance in CAN block. Valid values are:
> > + - 0x0: CAN1
> > + - 0x400: CAN2
> > + maxItems: 1
> > +
> > + interrupts:
> > + items:
> > + - description: transmit interrupt
> > + - description: FIFO 0 receive interrupt
> > + - description: FIFO 1 receive interrupt
> > + - description: status change error interrupt
> > +
> > + interrupt-names:
> > + items:
> > + - const: tx
> > + - const: rx0
> > + - const: rx1
> > + - const: sce
> > +
> > + resets:
> > + maxItems: 1
> > +
> > + clocks:
> > + description:
> > + Input clock for registers access
> > + maxItems: 1
> > +
> > + additionalProperties: false
> > +
> > + required:
> > + - compatible
> > + - reg
> > + - interrupts
> > + - resets
> > +
> > +examples:
> > + - |
> > + #include <dt-bindings/clock/stm32fx-clock.h>
> > + #include <dt-bindings/mfd/stm32f4-rcc.h>
> > +
> > + can: can@40006400 {
> > + compatible = "st,stm32f4-bxcan-core";
> > + reg = <0x40006400 0x800>;
> > + resets = <&rcc STM32F4_APB1_RESET(CAN1)>;
> > + clocks = <&rcc 0 STM32F4_APB1_CLOCK(CAN1)>;
> > + #address-cells = <1>;
> > + #size-cells = <0>;
> > +
>
> Missing 'ranges'.
In the file arch/arm/boot/dts/stm32f429.dtsi, I didn't find any other
node using the 'ranges' property, so
I didn't use it for the CAN node either.
>
> > + can1: can@0 {
> > + compatible = "st,stm32f4-bxcan";
> > + reg = <0x0>;
> > + interrupts = <19>, <20>, <21>, <22>;
> > + interrupt-names = "tx", "rx0", "rx1", "sce";
> > + resets = <&rcc STM32F4_APB1_RESET(CAN1)>;
> > + st,can-master;
>
> No clocks?
It uses the parent node clock, since it is in master mode.
Thanks and regards,
Dario
>
> > + };
> > +
> > + can2: can@400 {
> > + compatible = "st,stm32f4-bxcan";
> > + reg = <0x400>;
> > + interrupts = <63>, <64>, <65>, <66>;
> > + interrupt-names = "tx", "rx0", "rx1", "sce";
> > + resets = <&rcc STM32F4_APB1_RESET(CAN2)>;
> > + clocks = <&rcc 0 STM32F4_APB1_CLOCK(CAN2)>;
> > + };
> > + };
> > --
> > 2.32.0
> >
> >
--
Dario Binacchi
Embedded Linux Developer
dario.binacchi@amarulasolutions.com
__________________________________
Amarula Solutions SRL
Via Le Canevare 30, 31100 Treviso, Veneto, IT
T. +39 042 243 5310
info@amarulasolutions.com
www.amarulasolutions.com
On Fri, Aug 26, 2022 at 2:27 AM Dario Binacchi
<dario.binacchi@amarulasolutions.com> wrote:
>
> Hi Rob,
>
> On Thu, Aug 25, 2022 at 11:12 PM Rob Herring <robh@kernel.org> wrote:
> >
> > On Sat, Aug 20, 2022 at 10:29:33AM +0200, Dario Binacchi wrote:
> > > Add documentation of device tree bindings for the STM32 basic extended
> > > CAN (bxcan) controller.
> > >
> > > Signed-off-by: Dario Binacchi <dariobin@libero.it>
> > > Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
> > >
> > > ---
> > >
> > > Changes in v2:
> > > - Change the file name into 'st,stm32-bxcan-core.yaml'.
> > > - Rename compatibles:
> > > - st,stm32-bxcan-core -> st,stm32f4-bxcan-core
> > > - st,stm32-bxcan -> st,stm32f4-bxcan
> > > - Rename master property to st,can-master.
> > > - Remove the status property from the example.
> > > - Put the node child properties as required.
> > >
> > > .../bindings/net/can/st,stm32-bxcan.yaml | 136 ++++++++++++++++++
> > > 1 file changed, 136 insertions(+)
> > > create mode 100644 Documentation/devicetree/bindings/net/can/st,stm32-bxcan.yaml
> > >
> > > diff --git a/Documentation/devicetree/bindings/net/can/st,stm32-bxcan.yaml b/Documentation/devicetree/bindings/net/can/st,stm32-bxcan.yaml
> > > new file mode 100644
> > > index 000000000000..288631b5556d
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/net/can/st,stm32-bxcan.yaml
> > > @@ -0,0 +1,136 @@
> > > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > > +%YAML 1.2
> > > +---
> > > +$id: http://devicetree.org/schemas/net/can/st,stm32-bxcan.yaml#
> > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > +
> > > +title: STMicroelectronics bxCAN controller
> > > +
> > > +description: STMicroelectronics BxCAN controller for CAN bus
> > > +
> > > +maintainers:
> > > + - Dario Binacchi <dario.binacchi@amarulasolutions.com>
> > > +
> > > +allOf:
> > > + - $ref: can-controller.yaml#
> > > +
> > > +properties:
> > > + compatible:
> > > + enum:
> > > + - st,stm32f4-bxcan-core
> > > +
> > > + reg:
> > > + maxItems: 1
> > > +
> > > + resets:
> > > + maxItems: 1
> > > +
> > > + clocks:
> > > + description:
> > > + Input clock for registers access
> > > + maxItems: 1
> > > +
> > > + '#address-cells':
> > > + const: 1
> > > +
> > > + '#size-cells':
> > > + const: 0
> > > +
> > > +additionalProperties: false
> > > +
> > > +required:
> > > + - compatible
> > > + - reg
> > > + - resets
> > > + - clocks
> > > + - '#address-cells'
> > > + - '#size-cells'
> > > +
> > > +patternProperties:
> > > + "^can@[0-9]+$":
> > > + type: object
> > > + description:
> > > + A CAN block node contains two subnodes, representing each one a CAN
> > > + instance available on the machine.
> > > +
> > > + properties:
> > > + compatible:
> > > + enum:
> > > + - st,stm32f4-bxcan
> > > +
> > > + st,can-master:
> > > + description:
> > > + Master and slave mode of the bxCAN peripheral is only relevant
> > > + if the chip has two CAN peripherals. In that case they share
> > > + some of the required logic, and that means you cannot use the
> > > + slave CAN without the master CAN.
> > > + type: boolean
> > > +
> > > + reg:
> > > + description: |
> > > + Offset of CAN instance in CAN block. Valid values are:
> > > + - 0x0: CAN1
> > > + - 0x400: CAN2
> > > + maxItems: 1
> > > +
> > > + interrupts:
> > > + items:
> > > + - description: transmit interrupt
> > > + - description: FIFO 0 receive interrupt
> > > + - description: FIFO 1 receive interrupt
> > > + - description: status change error interrupt
> > > +
> > > + interrupt-names:
> > > + items:
> > > + - const: tx
> > > + - const: rx0
> > > + - const: rx1
> > > + - const: sce
> > > +
> > > + resets:
> > > + maxItems: 1
> > > +
> > > + clocks:
> > > + description:
> > > + Input clock for registers access
> > > + maxItems: 1
> > > +
> > > + additionalProperties: false
> > > +
> > > + required:
> > > + - compatible
> > > + - reg
> > > + - interrupts
> > > + - resets
> > > +
> > > +examples:
> > > + - |
> > > + #include <dt-bindings/clock/stm32fx-clock.h>
> > > + #include <dt-bindings/mfd/stm32f4-rcc.h>
> > > +
> > > + can: can@40006400 {
> > > + compatible = "st,stm32f4-bxcan-core";
> > > + reg = <0x40006400 0x800>;
> > > + resets = <&rcc STM32F4_APB1_RESET(CAN1)>;
> > > + clocks = <&rcc 0 STM32F4_APB1_CLOCK(CAN1)>;
> > > + #address-cells = <1>;
> > > + #size-cells = <0>;
> > > +
> >
> > Missing 'ranges'.
>
> In the file arch/arm/boot/dts/stm32f429.dtsi, I didn't find any other
> node using the 'ranges' property, so
> I didn't use it for the CAN node either.
If the child node is a memory mapped address, then you need 'ranges'.
Otherwise, things like of_iomap() don't work.
Looking at the above file, only efuse@1fff7800 and adc@40012000 seem
to be cases also missing 'ranges'.
Rob
On 20/08/2022 11:29, Dario Binacchi wrote: > Add documentation of device tree bindings for the STM32 basic extended > CAN (bxcan) controller. > > Signed-off-by: Dario Binacchi <dariobin@libero.it> > Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com> > > --- > > Changes in v2: > - Change the file name into 'st,stm32-bxcan-core.yaml'. > - Rename compatibles: > - st,stm32-bxcan-core -> st,stm32f4-bxcan-core > - st,stm32-bxcan -> st,stm32f4-bxcan > - Rename master property to st,can-master. > - Remove the status property from the example. > - Put the node child properties as required. > > .../bindings/net/can/st,stm32-bxcan.yaml | 136 ++++++++++++++++++ > 1 file changed, 136 insertions(+) > create mode 100644 Documentation/devicetree/bindings/net/can/st,stm32-bxcan.yaml > > diff --git a/Documentation/devicetree/bindings/net/can/st,stm32-bxcan.yaml b/Documentation/devicetree/bindings/net/can/st,stm32-bxcan.yaml > new file mode 100644 > index 000000000000..288631b5556d > --- /dev/null > +++ b/Documentation/devicetree/bindings/net/can/st,stm32-bxcan.yaml > @@ -0,0 +1,136 @@ > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) > +%YAML 1.2 > +--- > +$id: http://devicetree.org/schemas/net/can/st,stm32-bxcan.yaml# > +$schema: http://devicetree.org/meta-schemas/core.yaml# > + > +title: STMicroelectronics bxCAN controller > + > +description: STMicroelectronics BxCAN controller for CAN bus > + > +maintainers: > + - Dario Binacchi <dario.binacchi@amarulasolutions.com> > + > +allOf: > + - $ref: can-controller.yaml# > + > +properties: > + compatible: > + enum: > + - st,stm32f4-bxcan-core > + > + reg: > + maxItems: 1 > + > + resets: > + maxItems: 1 > + > + clocks: > + description: > + Input clock for registers access > + maxItems: 1 > + > + '#address-cells': > + const: 1 > + > + '#size-cells': > + const: 0 > + > +additionalProperties: false > + > +required: > + - compatible > + - reg > + - resets > + - clocks > + - '#address-cells' > + - '#size-cells' > + > +patternProperties: No improvements here, so my comment stay. Please fix it. > + "^can@[0-9]+$": > + type: object > + description: > + A CAN block node contains two subnodes, representing each one a CAN > + instance available on the machine. I still do not understand why you need children. You did not CC me on driver change, so difficult to say. You did not describe the parent device - there is no description. Why do you need parent device at all? This looks like some driver-driven-bindings instead of just real hardware description. Best regards, Krzysztof
Hi Krzysztof, On Tue, Aug 23, 2022 at 3:41 PM Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> wrote: > > On 20/08/2022 11:29, Dario Binacchi wrote: > > Add documentation of device tree bindings for the STM32 basic extended > > CAN (bxcan) controller. > > > > Signed-off-by: Dario Binacchi <dariobin@libero.it> > > Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com> > > > > --- > > > > Changes in v2: > > - Change the file name into 'st,stm32-bxcan-core.yaml'. > > - Rename compatibles: > > - st,stm32-bxcan-core -> st,stm32f4-bxcan-core > > - st,stm32-bxcan -> st,stm32f4-bxcan > > - Rename master property to st,can-master. > > - Remove the status property from the example. > > - Put the node child properties as required. > > > > .../bindings/net/can/st,stm32-bxcan.yaml | 136 ++++++++++++++++++ > > 1 file changed, 136 insertions(+) > > create mode 100644 Documentation/devicetree/bindings/net/can/st,stm32-bxcan.yaml > > > > diff --git a/Documentation/devicetree/bindings/net/can/st,stm32-bxcan.yaml b/Documentation/devicetree/bindings/net/can/st,stm32-bxcan.yaml > > new file mode 100644 > > index 000000000000..288631b5556d > > --- /dev/null > > +++ b/Documentation/devicetree/bindings/net/can/st,stm32-bxcan.yaml > > @@ -0,0 +1,136 @@ > > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) > > +%YAML 1.2 > > +--- > > +$id: http://devicetree.org/schemas/net/can/st,stm32-bxcan.yaml# > > +$schema: http://devicetree.org/meta-schemas/core.yaml# > > + > > +title: STMicroelectronics bxCAN controller > > + > > +description: STMicroelectronics BxCAN controller for CAN bus > > + > > +maintainers: > > + - Dario Binacchi <dario.binacchi@amarulasolutions.com> > > + > > +allOf: > > + - $ref: can-controller.yaml# > > + > > +properties: > > + compatible: > > + enum: > > + - st,stm32f4-bxcan-core > > + > > + reg: > > + maxItems: 1 > > + > > + resets: > > + maxItems: 1 > > + > > + clocks: > > + description: > > + Input clock for registers access > > + maxItems: 1 > > + > > + '#address-cells': > > + const: 1 > > + > > + '#size-cells': > > + const: 0 > > + > > +additionalProperties: false > > + > > +required: > > + - compatible > > + - reg > > + - resets > > + - clocks > > + - '#address-cells' > > + - '#size-cells' > > + > > +patternProperties: > > No improvements here, so my comment stay. Please fix it. Sorry, I'ff fix it in version 3. > > > > + "^can@[0-9]+$": > > + type: object > > + description: > > + A CAN block node contains two subnodes, representing each one a CAN > > + instance available on the machine. > > I still do not understand why you need children. You did not CC me on > driver change, so difficult to say. You did not describe the parent On the next submissions I'll send you all the series patches. > device - there is no description. Ok, I'll do it. > Why do you need parent device at all? > This looks like some driver-driven-bindings instead of just real > hardware description. The two devices are not independent. As described in the reference manual RM0386 (STM32F469xx and STM32F479xx advanced Arm®-based 32-bit MCUs) in paragraph 34.2, the bxCAN controller is a dual CAN peripheral configuration: • CAN1: Master bxCAN for managing the communication between a Slave bxCAN and the 512-byte SRAM memory • CAN2: Slave bxCAN, with no direct access to the SRAM memory. So, if I want to use CAN2 only (and not CAN1), I need to be able to use shared resources with CAN1 without having to probe the CAN1 driver. IMHO here is the justification of the parent node. Thanks and regards, Dario > > Best regards, > Krzysztof -- Dario Binacchi Embedded Linux Developer dario.binacchi@amarulasolutions.com __________________________________ Amarula Solutions SRL Via Le Canevare 30, 31100 Treviso, Veneto, IT T. +39 042 243 5310 info@amarulasolutions.com www.amarulasolutions.com
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