[PATCH v2 0/7] Add support for RZ/G3E CANFD

[PATCH v2 0/7] Add support for RZ/G3E CANFD

[Biju Das]

The CAN-FD module on RZ/G3E is very similar to the one on both R-Car V4H
and RZ/G2L, but differs in some hardware parameters:
 * No external clock, but instead has ram clock.
 * Support up to 6 channels.
 * 20 interrupts.

This patch series depend upon [1]
[1] https://lore.kernel.org/all/20250220094516.126598-1-biju.das.jz@bp.renesas.com/

v1->v2:
 * Split the series with fixes patch separately.
 * Added patch for Simplify rcar_canfd_probe() using
   of_get_available_child_by_name() as dependency patch hit on can-next.
 * Added Rb tag from Vincent Mailhol.
 * Dropped redundant comment from commit description for patch#3.

Biju Das (7):
  dt-bindings: can: renesas,rcar-canfd: Simplify the conditional schema
  dt-bindings: can: renesas,rcar-canfd: Document RZ/G3E support
  can: rcar_canfd: Use of_get_available_child_by_name()
  can: rcar_canfd: Add gen4_type variable to struct rcar_canfd_hw_info
  can: rcar_canfd: Add only_internal_clks variable to struct
    rcar_canfd_hw_info
  can: rcar_canfd: Enhance multi_channel_irqs handling
  can: rcar_canfd: Add RZ/G3E support

 .../bindings/net/can/renesas,rcar-canfd.yaml  | 180 +++++++++++++-----
 drivers/net/can/rcar/rcar_canfd.c             |  35 +++-
 2 files changed, 165 insertions(+), 50 deletions(-)

-- 
2.43.0

[PATCH v2 1/7] dt-bindings: can: renesas,rcar-canfd: Simplify the conditional schema

[Biju Das]

RZ/G3E SoC has 20 interrupts, 2 resets and 6 channels that need more
branching with conditional schema. Simplify the conditional schema with
if statements rather than the complex if-else statements to prepare for
supporting RZ/G3E SoC.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
---
This patch depend upon [1]
[1] https://lore.kernel.org/all/20250220094516.126598-2-biju.das.jz@bp.renesas.com/
v1->v2:
 * No change
---
 .../bindings/net/can/renesas,rcar-canfd.yaml  | 123 ++++++++++++------
 1 file changed, 80 insertions(+), 43 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml b/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml
index f6884f6e59e7..f87f90f431e5 100644
--- a/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml
+++ b/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml
@@ -45,7 +45,35 @@ properties:
   reg:
     maxItems: 1
 
-  interrupts: true
+  interrupts:
+    oneOf:
+      - items:
+          - description: Channel interrupt
+          - description: Global interrupt
+      - items:
+          - description: CAN global error interrupt
+          - description: CAN receive FIFO interrupt
+          - description: CAN0 error interrupt
+          - description: CAN0 transmit interrupt
+          - description: CAN0 transmit/receive FIFO receive completion interrupt
+          - description: CAN1 error interrupt
+          - description: CAN1 transmit interrupt
+          - description: CAN1 transmit/receive FIFO receive completion interrupt
+
+  interrupt-names:
+    oneOf:
+      - items:
+          - const: ch_int
+          - const: g_int
+      - items:
+          - const: g_err
+          - const: g_recc
+          - const: ch0_err
+          - const: ch0_rec
+          - const: ch0_trx
+          - const: ch1_err
+          - const: ch1_rec
+          - const: ch1_trx
 
   clocks:
     maxItems: 3
@@ -117,52 +145,71 @@ allOf:
     then:
       properties:
         interrupts:
-          items:
-            - description: CAN global error interrupt
-            - description: CAN receive FIFO interrupt
-            - description: CAN0 error interrupt
-            - description: CAN0 transmit interrupt
-            - description: CAN0 transmit/receive FIFO receive completion interrupt
-            - description: CAN1 error interrupt
-            - description: CAN1 transmit interrupt
-            - description: CAN1 transmit/receive FIFO receive completion interrupt
+          minItems: 8
+          maxItems: 8
 
         interrupt-names:
-          items:
-            - const: g_err
-            - const: g_recc
-            - const: ch0_err
-            - const: ch0_rec
-            - const: ch0_trx
-            - const: ch1_err
-            - const: ch1_rec
-            - const: ch1_trx
+          minItems: 8
+          maxItems: 8
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - renesas,rcar-gen3-canfd
+              - renesas,rcar-gen4-canfd
+    then:
+      properties:
+        interrupts:
+          minItems: 2
+          maxItems: 2
+
+        interrupt-names:
+          minItems: 2
+          maxItems: 2
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: renesas,rzg2l-canfd
+    then:
+      properties:
         resets:
+          minItems: 2
           maxItems: 2
 
         reset-names:
-          items:
-            - const: rstp_n
-            - const: rstc_n
+          minItems: 2
+          maxItems: 2
 
       required:
         - reset-names
-    else:
-      properties:
-        interrupts:
-          items:
-            - description: Channel interrupt
-            - description: Global interrupt
-
-        interrupt-names:
-          items:
-            - const: ch_int
-            - const: g_int
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - renesas,rcar-gen3-canfd
+              - renesas,rcar-gen4-canfd
+    then:
+      properties:
         resets:
           maxItems: 1
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - renesas,rcar-gen3-canfd
+              - renesas,rzg2l-canfd
+    then:
+      patternProperties:
+        "^channel[2-7]$": false
+
   - if:
       properties:
         compatible:
@@ -171,16 +218,6 @@ allOf:
     then:
       patternProperties:
         "^channel[4-7]$": false
-    else:
-      if:
-        not:
-          properties:
-            compatible:
-              contains:
-                const: renesas,rcar-gen4-canfd
-      then:
-        patternProperties:
-          "^channel[2-7]$": false
 
 unevaluatedProperties: false
 
-- 
2.43.0

Re: [PATCH v2 1/7] dt-bindings: can: renesas,rcar-canfd: Simplify the conditional schema

[Conor Dooley]

[-- Attachment #1: Type: text/plain, Size: 422 bytes --]

On Thu, Feb 20, 2025 at 01:04:17PM +0000, Biju Das wrote:
> RZ/G3E SoC has 20 interrupts, 2 resets and 6 channels that need more
> branching with conditional schema. Simplify the conditional schema with
> if statements rather than the complex if-else statements to prepare for
> supporting RZ/G3E SoC.
> 
> Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>

Acked-by: Conor Dooley <conor.dooley@microchip.com>

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[PATCH v2 2/7] dt-bindings: can: renesas,rcar-canfd: Document RZ/G3E support

[Biju Das]

Document support for the CAN-FD Interface on the RZ/G3E (R9A09G047) SoC,
which supports up to six channels.

The CAN-FD module on RZ/G3E is very similar to the one on both R-Car V4H
and RZ/G2L, but differs in some hardware parameters:
 * No external clock, but instead has ram clock.
 * Support up to 6 channels.
 * 20 interrupts.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
---
v1->v2:
 * No change.
---
 .../bindings/net/can/renesas,rcar-canfd.yaml  | 67 +++++++++++++++++--
 1 file changed, 62 insertions(+), 5 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml b/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml
index f87f90f431e5..189d5303ad75 100644
--- a/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml
+++ b/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml
@@ -42,6 +42,8 @@ properties:
               - renesas,r9a07g054-canfd    # RZ/V2L
           - const: renesas,rzg2l-canfd     # RZ/G2L family
 
+      - const: renesas,r9a09g047-canfd     # RZ/G3E
+
   reg:
     maxItems: 1
 
@@ -59,6 +61,19 @@ properties:
           - description: CAN1 error interrupt
           - description: CAN1 transmit interrupt
           - description: CAN1 transmit/receive FIFO receive completion interrupt
+          - description: CAN2 error interrupt
+          - description: CAN2 transmit interrupt
+          - description: CAN2 transmit/receive FIFO receive completion interrupt
+          - description: CAN3 error interrupt
+          - description: CAN3 transmit interrupt
+          - description: CAN3 transmit/receive FIFO receive completion interrupt
+          - description: CAN4 error interrupt
+          - description: CAN4 transmit interrupt
+          - description: CAN4 transmit/receive FIFO receive completion interrupt
+          - description: CAN5 error interrupt
+          - description: CAN5 transmit interrupt
+          - description: CAN5 transmit/receive FIFO receive completion interrupt
+        minItems: 8
 
   interrupt-names:
     oneOf:
@@ -74,15 +89,33 @@ properties:
           - const: ch1_err
           - const: ch1_rec
           - const: ch1_trx
+          - const: ch2_err
+          - const: ch2_rec
+          - const: ch2_trx
+          - const: ch3_err
+          - const: ch3_rec
+          - const: ch3_trx
+          - const: ch4_err
+          - const: ch4_rec
+          - const: ch4_trx
+          - const: ch5_err
+          - const: ch5_rec
+          - const: ch5_trx
+        minItems: 8
 
   clocks:
     maxItems: 3
 
   clock-names:
-    items:
-      - const: fck
-      - const: canfd
-      - const: can_clk
+    oneOf:
+      - items:
+          - const: fck
+          - const: canfd
+          - const: can_clk
+      - items:
+          - const: fck
+          - const: ram_clk
+          - const: can_clk
 
   power-domains:
     maxItems: 1
@@ -173,7 +206,9 @@ allOf:
       properties:
         compatible:
           contains:
-            const: renesas,rzg2l-canfd
+            enum:
+              - renesas,r9a09g047-canfd
+              - renesas,rzg2l-canfd
     then:
       properties:
         resets:
@@ -187,6 +222,19 @@ allOf:
       required:
         - reset-names
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: renesas,r9a09g047-canfd
+    then:
+      properties:
+        interrupts:
+          maxItems: 20
+
+        interrupt-names:
+          maxItems: 20
+
   - if:
       properties:
         compatible:
@@ -219,6 +267,15 @@ allOf:
       patternProperties:
         "^channel[4-7]$": false
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: renesas,r9a09g047-canfd
+    then:
+      patternProperties:
+        "^channel[6-7]$": false
+
 unevaluatedProperties: false
 
 examples:
-- 
2.43.0

Re: [PATCH v2 2/7] dt-bindings: can: renesas,rcar-canfd: Document RZ/G3E support

[Conor Dooley]

[-- Attachment #1: Type: text/plain, Size: 4495 bytes --]

On Thu, Feb 20, 2025 at 01:04:18PM +0000, Biju Das wrote:
> Document support for the CAN-FD Interface on the RZ/G3E (R9A09G047) SoC,
> which supports up to six channels.
> 
> The CAN-FD module on RZ/G3E is very similar to the one on both R-Car V4H
> and RZ/G2L, but differs in some hardware parameters:
>  * No external clock, but instead has ram clock.
>  * Support up to 6 channels.
>  * 20 interrupts.
> 
> Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
> ---
> v1->v2:
>  * No change.
> ---
>  .../bindings/net/can/renesas,rcar-canfd.yaml  | 67 +++++++++++++++++--
>  1 file changed, 62 insertions(+), 5 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml b/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml
> index f87f90f431e5..189d5303ad75 100644
> --- a/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml
> +++ b/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml
> @@ -42,6 +42,8 @@ properties:
>                - renesas,r9a07g054-canfd    # RZ/V2L
>            - const: renesas,rzg2l-canfd     # RZ/G2L family
>  
> +      - const: renesas,r9a09g047-canfd     # RZ/G3E
> +
>    reg:
>      maxItems: 1
>  
> @@ -59,6 +61,19 @@ properties:
>            - description: CAN1 error interrupt
>            - description: CAN1 transmit interrupt
>            - description: CAN1 transmit/receive FIFO receive completion interrupt
> +          - description: CAN2 error interrupt
> +          - description: CAN2 transmit interrupt
> +          - description: CAN2 transmit/receive FIFO receive completion interrupt
> +          - description: CAN3 error interrupt
> +          - description: CAN3 transmit interrupt
> +          - description: CAN3 transmit/receive FIFO receive completion interrupt
> +          - description: CAN4 error interrupt
> +          - description: CAN4 transmit interrupt
> +          - description: CAN4 transmit/receive FIFO receive completion interrupt
> +          - description: CAN5 error interrupt
> +          - description: CAN5 transmit interrupt
> +          - description: CAN5 transmit/receive FIFO receive completion interrupt
> +        minItems: 8
>  
>    interrupt-names:
>      oneOf:
> @@ -74,15 +89,33 @@ properties:
>            - const: ch1_err
>            - const: ch1_rec
>            - const: ch1_trx
> +          - const: ch2_err
> +          - const: ch2_rec
> +          - const: ch2_trx
> +          - const: ch3_err
> +          - const: ch3_rec
> +          - const: ch3_trx
> +          - const: ch4_err
> +          - const: ch4_rec
> +          - const: ch4_trx
> +          - const: ch5_err
> +          - const: ch5_rec
> +          - const: ch5_trx
> +        minItems: 8
>  
>    clocks:
>      maxItems: 3
>  
>    clock-names:
> -    items:
> -      - const: fck
> -      - const: canfd
> -      - const: can_clk
> +    oneOf:
> +      - items:
> +          - const: fck
> +          - const: canfd
> +          - const: can_clk
> +      - items:
> +          - const: fck
> +          - const: ram_clk
> +          - const: can_clk
>  
>    power-domains:
>      maxItems: 1
> @@ -173,7 +206,9 @@ allOf:
>        properties:
>          compatible:
>            contains:
> -            const: renesas,rzg2l-canfd
> +            enum:
> +              - renesas,r9a09g047-canfd
> +              - renesas,rzg2l-canfd
>      then:
>        properties:
>          resets:
> @@ -187,6 +222,19 @@ allOf:
>        required:
>          - reset-names
>  
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: renesas,r9a09g047-canfd
> +    then:
> +      properties:
> +        interrupts:
> +          maxItems: 20
> +
> +        interrupt-names:
> +          maxItems: 20

Should these be minItems instead of maxItems? The list has 20 elements
at the moment (right?) so you're not adding any restriction here.

> +
>    - if:
>        properties:
>          compatible:
> @@ -219,6 +267,15 @@ allOf:
>        patternProperties:
>          "^channel[4-7]$": false
>  
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: renesas,r9a09g047-canfd
> +    then:
> +      patternProperties:
> +        "^channel[6-7]$": false
> +
>  unevaluatedProperties: false
>  
>  examples:
> -- 
> 2.43.0
> 

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RE: [PATCH v2 2/7] dt-bindings: can: renesas,rcar-canfd: Document RZ/G3E support

[Biju Das]

Hi Conor Dooley,

Thanks for the feedback.

> -----Original Message-----
> From: Conor Dooley <conor@kernel.org>
> Sent: 21 February 2025 17:54
> Subject: Re: [PATCH v2 2/7] dt-bindings: can: renesas,rcar-canfd: Document RZ/G3E support
> 
> On Thu, Feb 20, 2025 at 01:04:18PM +0000, Biju Das wrote:
> > Document support for the CAN-FD Interface on the RZ/G3E (R9A09G047)
> > SoC, which supports up to six channels.
> >
> > The CAN-FD module on RZ/G3E is very similar to the one on both R-Car
> > V4H and RZ/G2L, but differs in some hardware parameters:
> >  * No external clock, but instead has ram clock.
> >  * Support up to 6 channels.
> >  * 20 interrupts.
> >
> > Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
> > ---
> > v1->v2:
> >  * No change.
> > ---
> >  .../bindings/net/can/renesas,rcar-canfd.yaml  | 67
> > +++++++++++++++++--
> >  1 file changed, 62 insertions(+), 5 deletions(-)
> >
> > diff --git
> > a/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml
> > b/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml
> > index f87f90f431e5..189d5303ad75 100644
> > ---
> > a/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml
> > +++ b/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yam
> > +++ l
> > @@ -42,6 +42,8 @@ properties:
> >                - renesas,r9a07g054-canfd    # RZ/V2L
> >            - const: renesas,rzg2l-canfd     # RZ/G2L family
> >
> > +      - const: renesas,r9a09g047-canfd     # RZ/G3E
> > +
> >    reg:
> >      maxItems: 1
> >
> > @@ -59,6 +61,19 @@ properties:
> >            - description: CAN1 error interrupt
> >            - description: CAN1 transmit interrupt
> >            - description: CAN1 transmit/receive FIFO receive
> > completion interrupt
> > +          - description: CAN2 error interrupt
> > +          - description: CAN2 transmit interrupt
> > +          - description: CAN2 transmit/receive FIFO receive completion interrupt
> > +          - description: CAN3 error interrupt
> > +          - description: CAN3 transmit interrupt
> > +          - description: CAN3 transmit/receive FIFO receive completion interrupt
> > +          - description: CAN4 error interrupt
> > +          - description: CAN4 transmit interrupt
> > +          - description: CAN4 transmit/receive FIFO receive completion interrupt
> > +          - description: CAN5 error interrupt
> > +          - description: CAN5 transmit interrupt
> > +          - description: CAN5 transmit/receive FIFO receive completion interrupt
> > +        minItems: 8
> >
> >    interrupt-names:
> >      oneOf:
> > @@ -74,15 +89,33 @@ properties:
> >            - const: ch1_err
> >            - const: ch1_rec
> >            - const: ch1_trx
> > +          - const: ch2_err
> > +          - const: ch2_rec
> > +          - const: ch2_trx
> > +          - const: ch3_err
> > +          - const: ch3_rec
> > +          - const: ch3_trx
> > +          - const: ch4_err
> > +          - const: ch4_rec
> > +          - const: ch4_trx
> > +          - const: ch5_err
> > +          - const: ch5_rec
> > +          - const: ch5_trx
> > +        minItems: 8
> >
> >    clocks:
> >      maxItems: 3
> >
> >    clock-names:
> > -    items:
> > -      - const: fck
> > -      - const: canfd
> > -      - const: can_clk
> > +    oneOf:
> > +      - items:
> > +          - const: fck
> > +          - const: canfd
> > +          - const: can_clk
> > +      - items:
> > +          - const: fck
> > +          - const: ram_clk
> > +          - const: can_clk
> >
> >    power-domains:
> >      maxItems: 1
> > @@ -173,7 +206,9 @@ allOf:
> >        properties:
> >          compatible:
> >            contains:
> > -            const: renesas,rzg2l-canfd
> > +            enum:
> > +              - renesas,r9a09g047-canfd
> > +              - renesas,rzg2l-canfd
> >      then:
> >        properties:
> >          resets:
> > @@ -187,6 +222,19 @@ allOf:
> >        required:
> >          - reset-names
> >
> > +  - if:
> > +      properties:
> > +        compatible:
> > +          contains:
> > +            const: renesas,r9a09g047-canfd
> > +    then:
> > +      properties:
> > +        interrupts:
> > +          maxItems: 20
> > +
> > +        interrupt-names:
> > +          maxItems: 20
> 
> Should these be minItems instead of maxItems? The list has 20 elements at the moment (right?) so
> you're not adding any restriction here.

Yes, it should be minItems.

Cheers,
Biju

> 
> > +
> >    - if:
> >        properties:
> >          compatible:
> > @@ -219,6 +267,15 @@ allOf:
> >        patternProperties:
> >          "^channel[4-7]$": false
> >
> > +  - if:
> > +      properties:
> > +        compatible:
> > +          contains:
> > +            const: renesas,r9a09g047-canfd
> > +    then:
> > +      patternProperties:
> > +        "^channel[6-7]$": false
> > +
> >  unevaluatedProperties: false
> >
> >  examples:
> > --
> > 2.43.0
> >

Re: [PATCH v2 2/7] dt-bindings: can: renesas,rcar-canfd: Document RZ/G3E support

[Rob Herring]

On Fri, Feb 21, 2025 at 05:53:43PM +0000, Conor Dooley wrote:
> On Thu, Feb 20, 2025 at 01:04:18PM +0000, Biju Das wrote:
> > Document support for the CAN-FD Interface on the RZ/G3E (R9A09G047) SoC,
> > which supports up to six channels.
> > 
> > The CAN-FD module on RZ/G3E is very similar to the one on both R-Car V4H
> > and RZ/G2L, but differs in some hardware parameters:
> >  * No external clock, but instead has ram clock.
> >  * Support up to 6 channels.
> >  * 20 interrupts.
> > 
> > Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
> > ---
> > v1->v2:
> >  * No change.
> > ---
> >  .../bindings/net/can/renesas,rcar-canfd.yaml  | 67 +++++++++++++++++--
> >  1 file changed, 62 insertions(+), 5 deletions(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml b/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml
> > index f87f90f431e5..189d5303ad75 100644
> > --- a/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml
> > +++ b/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml
> > @@ -42,6 +42,8 @@ properties:
> >                - renesas,r9a07g054-canfd    # RZ/V2L
> >            - const: renesas,rzg2l-canfd     # RZ/G2L family
> >  
> > +      - const: renesas,r9a09g047-canfd     # RZ/G3E
> > +
> >    reg:
> >      maxItems: 1
> >  
> > @@ -59,6 +61,19 @@ properties:
> >            - description: CAN1 error interrupt
> >            - description: CAN1 transmit interrupt
> >            - description: CAN1 transmit/receive FIFO receive completion interrupt
> > +          - description: CAN2 error interrupt
> > +          - description: CAN2 transmit interrupt
> > +          - description: CAN2 transmit/receive FIFO receive completion interrupt
> > +          - description: CAN3 error interrupt
> > +          - description: CAN3 transmit interrupt
> > +          - description: CAN3 transmit/receive FIFO receive completion interrupt
> > +          - description: CAN4 error interrupt
> > +          - description: CAN4 transmit interrupt
> > +          - description: CAN4 transmit/receive FIFO receive completion interrupt
> > +          - description: CAN5 error interrupt
> > +          - description: CAN5 transmit interrupt
> > +          - description: CAN5 transmit/receive FIFO receive completion interrupt
> > +        minItems: 8
> >  
> >    interrupt-names:
> >      oneOf:
> > @@ -74,15 +89,33 @@ properties:
> >            - const: ch1_err
> >            - const: ch1_rec
> >            - const: ch1_trx
> > +          - const: ch2_err
> > +          - const: ch2_rec
> > +          - const: ch2_trx
> > +          - const: ch3_err
> > +          - const: ch3_rec
> > +          - const: ch3_trx
> > +          - const: ch4_err
> > +          - const: ch4_rec
> > +          - const: ch4_trx
> > +          - const: ch5_err
> > +          - const: ch5_rec
> > +          - const: ch5_trx
> > +        minItems: 8
> >  
> >    clocks:
> >      maxItems: 3
> >  
> >    clock-names:
> > -    items:
> > -      - const: fck
> > -      - const: canfd
> > -      - const: can_clk
> > +    oneOf:
> > +      - items:
> > +          - const: fck
> > +          - const: canfd
> > +          - const: can_clk
> > +      - items:
> > +          - const: fck
> > +          - const: ram_clk
> > +          - const: can_clk
> >  
> >    power-domains:
> >      maxItems: 1
> > @@ -173,7 +206,9 @@ allOf:
> >        properties:
> >          compatible:
> >            contains:
> > -            const: renesas,rzg2l-canfd
> > +            enum:
> > +              - renesas,r9a09g047-canfd
> > +              - renesas,rzg2l-canfd
> >      then:
> >        properties:
> >          resets:
> > @@ -187,6 +222,19 @@ allOf:
> >        required:
> >          - reset-names
> >  
> > +  - if:
> > +      properties:
> > +        compatible:
> > +          contains:
> > +            const: renesas,r9a09g047-canfd
> > +    then:
> > +      properties:
> > +        interrupts:
> > +          maxItems: 20
> > +
> > +        interrupt-names:
> > +          maxItems: 20
> 
> Should these be minItems instead of maxItems? The list has 20 elements
> at the moment (right?) so you're not adding any restriction here.

And the existing platforms need to have 'maxItems: 8'.

RE: [PATCH v2 2/7] dt-bindings: can: renesas,rcar-canfd: Document RZ/G3E support

[Biju Das]

Hi Rob,

Thanks for the feedback.

> -----Original Message-----
> From: Rob Herring <robh@kernel.org>
> Sent: 21 February 2025 23:19
> Subject: Re: [PATCH v2 2/7] dt-bindings: can: renesas,rcar-canfd: Document RZ/G3E support
> 
> On Fri, Feb 21, 2025 at 05:53:43PM +0000, Conor Dooley wrote:
> > On Thu, Feb 20, 2025 at 01:04:18PM +0000, Biju Das wrote:
> > > Document support for the CAN-FD Interface on the RZ/G3E (R9A09G047)
> > > SoC, which supports up to six channels.
> > >
> > > The CAN-FD module on RZ/G3E is very similar to the one on both R-Car
> > > V4H and RZ/G2L, but differs in some hardware parameters:
> > >  * No external clock, but instead has ram clock.
> > >  * Support up to 6 channels.
> > >  * 20 interrupts.
> > >
> > > Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
> > > ---
> > > v1->v2:
> > >  * No change.
> > > ---
> > >  .../bindings/net/can/renesas,rcar-canfd.yaml  | 67
> > > +++++++++++++++++--
> > >  1 file changed, 62 insertions(+), 5 deletions(-)
> > >
> > > diff --git
> > > a/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml
> > > b/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml
> > > index f87f90f431e5..189d5303ad75 100644
> > > ---
> > > a/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml
> > > +++ b/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.y
> > > +++ aml
> > > @@ -42,6 +42,8 @@ properties:
> > >                - renesas,r9a07g054-canfd    # RZ/V2L
> > >            - const: renesas,rzg2l-canfd     # RZ/G2L family
> > >
> > > +      - const: renesas,r9a09g047-canfd     # RZ/G3E
> > > +
> > >    reg:
> > >      maxItems: 1
> > >
> > > @@ -59,6 +61,19 @@ properties:
> > >            - description: CAN1 error interrupt
> > >            - description: CAN1 transmit interrupt
> > >            - description: CAN1 transmit/receive FIFO receive
> > > completion interrupt
> > > +          - description: CAN2 error interrupt
> > > +          - description: CAN2 transmit interrupt
> > > +          - description: CAN2 transmit/receive FIFO receive completion interrupt
> > > +          - description: CAN3 error interrupt
> > > +          - description: CAN3 transmit interrupt
> > > +          - description: CAN3 transmit/receive FIFO receive completion interrupt
> > > +          - description: CAN4 error interrupt
> > > +          - description: CAN4 transmit interrupt
> > > +          - description: CAN4 transmit/receive FIFO receive completion interrupt
> > > +          - description: CAN5 error interrupt
> > > +          - description: CAN5 transmit interrupt
> > > +          - description: CAN5 transmit/receive FIFO receive completion interrupt
> > > +        minItems: 8
> > >
> > >    interrupt-names:
> > >      oneOf:
> > > @@ -74,15 +89,33 @@ properties:
> > >            - const: ch1_err
> > >            - const: ch1_rec
> > >            - const: ch1_trx
> > > +          - const: ch2_err
> > > +          - const: ch2_rec
> > > +          - const: ch2_trx
> > > +          - const: ch3_err
> > > +          - const: ch3_rec
> > > +          - const: ch3_trx
> > > +          - const: ch4_err
> > > +          - const: ch4_rec
> > > +          - const: ch4_trx
> > > +          - const: ch5_err
> > > +          - const: ch5_rec
> > > +          - const: ch5_trx
> > > +        minItems: 8
> > >
> > >    clocks:
> > >      maxItems: 3
> > >
> > >    clock-names:
> > > -    items:
> > > -      - const: fck
> > > -      - const: canfd
> > > -      - const: can_clk
> > > +    oneOf:
> > > +      - items:
> > > +          - const: fck
> > > +          - const: canfd
> > > +          - const: can_clk
> > > +      - items:
> > > +          - const: fck
> > > +          - const: ram_clk
> > > +          - const: can_clk
> > >
> > >    power-domains:
> > >      maxItems: 1
> > > @@ -173,7 +206,9 @@ allOf:
> > >        properties:
> > >          compatible:
> > >            contains:
> > > -            const: renesas,rzg2l-canfd
> > > +            enum:
> > > +              - renesas,r9a09g047-canfd
> > > +              - renesas,rzg2l-canfd
> > >      then:
> > >        properties:
> > >          resets:
> > > @@ -187,6 +222,19 @@ allOf:
> > >        required:
> > >          - reset-names
> > >
> > > +  - if:
> > > +      properties:
> > > +        compatible:
> > > +          contains:
> > > +            const: renesas,r9a09g047-canfd
> > > +    then:
> > > +      properties:
> > > +        interrupts:
> > > +          maxItems: 20
> > > +
> > > +        interrupt-names:
> > > +          maxItems: 20
> >
> > Should these be minItems instead of maxItems? The list has 20 elements
> > at the moment (right?) so you're not adding any restriction here.
> 
> And the existing platforms need to have 'maxItems: 8'.

OK got.

platform 1: Here one of has min/max 2 interrupts. Platform 1 has 2 interrupts
        interrupts:
          minItems: 2
          maxItems: 2

Platform 2: Here one of Has min/max 8/20 interrupts and platform 2 has 8 interrupts
        interrupts:
          maxItems: 8

Platform 3: Here one of Has min/max 8/20 interrupts and platform 3 has 20 interrupts
        interrupts:
          minItems: 20

Cheers,
Biju

[PATCH v2 3/7] can: rcar_canfd: Use of_get_available_child_by_name()

[Biju Das]

Simplify rcar_canfd_probe() using of_get_available_child_by_name().

While at it, move of_node_put(child) inside the if block to avoid
additional check if of_child is NULL.

Reviewed-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
---
v2:
 * Added to this series as dependency patch hit on can-next.
 * Added Rb tag from Vincent Mailhol
 * Dropped redundant comment from commit description.
---
 drivers/net/can/rcar/rcar_canfd.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/can/rcar/rcar_canfd.c b/drivers/net/can/rcar/rcar_canfd.c
index 270f50d836f5..8b326977ddf7 100644
--- a/drivers/net/can/rcar/rcar_canfd.c
+++ b/drivers/net/can/rcar/rcar_canfd.c
@@ -1864,13 +1864,13 @@ static int rcar_canfd_probe(struct platform_device *pdev)
 
 	for (i = 0; i < info->max_channels; ++i) {
 		name[7] = '0' + i;
-		of_child = of_get_child_by_name(dev->of_node, name);
-		if (of_child && of_device_is_available(of_child)) {
+		of_child = of_get_available_child_by_name(dev->of_node, name);
+		if (of_child) {
 			channels_mask |= BIT(i);
 			transceivers[i] = devm_of_phy_optional_get(dev,
 							of_child, NULL);
+			of_node_put(of_child);
 		}
-		of_node_put(of_child);
 		if (IS_ERR(transceivers[i]))
 			return PTR_ERR(transceivers[i]);
 	}
-- 
2.43.0

Re: [PATCH v2 3/7] can: rcar_canfd: Use of_get_available_child_by_name()

[Geert Uytterhoeven]

On Thu, 20 Feb 2025 at 14:04, Biju Das <biju.das.jz@bp.renesas.com> wrote:
> Simplify rcar_canfd_probe() using of_get_available_child_by_name().
>
> While at it, move of_node_put(child) inside the if block to avoid
> additional check if of_child is NULL.
>
> Reviewed-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
> Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
> ---
> v2:
>  * Added to this series as dependency patch hit on can-next.
>  * Added Rb tag from Vincent Mailhol
>  * Dropped redundant comment from commit description.

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

[PATCH v2 4/7] can: rcar_canfd: Add gen4_type variable to struct rcar_canfd_hw_info

[Biju Das]

Both R-Car Gen4 and RZ/G3E SoCs have similar register layout. Introduce
gen4_type variable to struct rcar_canfd_hw_info for the preparation of
adding RZ/G3E driver support.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
---
v1->v2:
 * No change.
---
 drivers/net/can/rcar/rcar_canfd.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/can/rcar/rcar_canfd.c b/drivers/net/can/rcar/rcar_canfd.c
index 8b326977ddf7..13eb6aa6ae45 100644
--- a/drivers/net/can/rcar/rcar_canfd.c
+++ b/drivers/net/can/rcar/rcar_canfd.c
@@ -516,6 +516,7 @@ struct rcar_canfd_hw_info {
 	/* hardware features */
 	unsigned shared_global_irqs:1;	/* Has shared global irqs */
 	unsigned multi_channel_irqs:1;	/* Has multiple channel irqs */
+	unsigned gen4_type:1;		/* Has gen4 type reg layout */
 };
 
 /* Channel priv data */
@@ -596,6 +597,7 @@ static const struct rcar_canfd_hw_info rcar_gen4_hw_info = {
 	.max_channels = 8,
 	.postdiv = 2,
 	.shared_global_irqs = 1,
+	.gen4_type = 1,
 };
 
 static const struct rcar_canfd_hw_info rzg2l_hw_info = {
@@ -607,7 +609,7 @@ static const struct rcar_canfd_hw_info rzg2l_hw_info = {
 /* Helper functions */
 static inline bool is_gen4(struct rcar_canfd_global *gpriv)
 {
-	return gpriv->info == &rcar_gen4_hw_info;
+	return gpriv->info->gen4_type;
 }
 
 static inline u32 reg_gen4(struct rcar_canfd_global *gpriv,
-- 
2.43.0

Re: [PATCH v2 4/7] can: rcar_canfd: Add gen4_type variable to struct rcar_canfd_hw_info

[Geert Uytterhoeven]

Hi Biju,

On Thu, 20 Feb 2025 at 14:04, Biju Das <biju.das.jz@bp.renesas.com> wrote:
> Both R-Car Gen4 and RZ/G3E SoCs have similar register layout. Introduce
> gen4_type variable to struct rcar_canfd_hw_info for the preparation of
> adding RZ/G3E driver support.
>
> Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>

Thanks for your patch!

> --- a/drivers/net/can/rcar/rcar_canfd.c
> +++ b/drivers/net/can/rcar/rcar_canfd.c
> @@ -516,6 +516,7 @@ struct rcar_canfd_hw_info {
>         /* hardware features */
>         unsigned shared_global_irqs:1;  /* Has shared global irqs */
>         unsigned multi_channel_irqs:1;  /* Has multiple channel irqs */
> +       unsigned gen4_type:1;           /* Has gen4 type reg layout */

Perhaps this can be replaced by a (or more) more descriptive feature
flags, like you did before when introducing rcar_canfd_hw_info?

>  };
>
>  /* Channel priv data */
> @@ -596,6 +597,7 @@ static const struct rcar_canfd_hw_info rcar_gen4_hw_info = {
>         .max_channels = 8,
>         .postdiv = 2,
>         .shared_global_irqs = 1,
> +       .gen4_type = 1,
>  };
>
>  static const struct rcar_canfd_hw_info rzg2l_hw_info = {
> @@ -607,7 +609,7 @@ static const struct rcar_canfd_hw_info rzg2l_hw_info = {
>  /* Helper functions */
>  static inline bool is_gen4(struct rcar_canfd_global *gpriv)
>  {
> -       return gpriv->info == &rcar_gen4_hw_info;
> +       return gpriv->info->gen4_type;
>  }

And hopefully we can get rid of is_gen4() in the process, too...

>
>  static inline u32 reg_gen4(struct rcar_canfd_global *gpriv,

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

RE: [PATCH v2 4/7] can: rcar_canfd: Add gen4_type variable to struct rcar_canfd_hw_info

[Biju Das]

Hi Geert,

Thanks for the feedback.

> -----Original Message-----
> From: Geert Uytterhoeven <geert@linux-m68k.org>
> Sent: 24 February 2025 10:12
> Subject: Re: [PATCH v2 4/7] can: rcar_canfd: Add gen4_type variable to struct rcar_canfd_hw_info
> 
> Hi Biju,
> 
> On Thu, 20 Feb 2025 at 14:04, Biju Das <biju.das.jz@bp.renesas.com> wrote:
> > Both R-Car Gen4 and RZ/G3E SoCs have similar register layout.
> > Introduce gen4_type variable to struct rcar_canfd_hw_info for the
> > preparation of adding RZ/G3E driver support.
> >
> > Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
> 
> Thanks for your patch!
> 
> > --- a/drivers/net/can/rcar/rcar_canfd.c
> > +++ b/drivers/net/can/rcar/rcar_canfd.c
> > @@ -516,6 +516,7 @@ struct rcar_canfd_hw_info {
> >         /* hardware features */
> >         unsigned shared_global_irqs:1;  /* Has shared global irqs */
> >         unsigned multi_channel_irqs:1;  /* Has multiple channel irqs
> > */
> > +       unsigned gen4_type:1;           /* Has gen4 type reg layout */
> 
> Perhaps this can be replaced by a (or more) more descriptive feature flags, like you did before when
> introducing rcar_canfd_hw_info?

OK, Looking at commit log and hardware manual will do this change to add more descriptive feature flags.


> 
> >  };
> >
> >  /* Channel priv data */
> > @@ -596,6 +597,7 @@ static const struct rcar_canfd_hw_info rcar_gen4_hw_info = {
> >         .max_channels = 8,
> >         .postdiv = 2,
> >         .shared_global_irqs = 1,
> > +       .gen4_type = 1,
> >  };
> >
> >  static const struct rcar_canfd_hw_info rzg2l_hw_info = { @@ -607,7
> > +609,7 @@ static const struct rcar_canfd_hw_info rzg2l_hw_info = {
> >  /* Helper functions */
> >  static inline bool is_gen4(struct rcar_canfd_global *gpriv)  {
> > -       return gpriv->info == &rcar_gen4_hw_info;
> > +       return gpriv->info->gen4_type;
> >  }
> 
> And hopefully we can get rid of is_gen4() in the process, too...

Agreed.

Cheers,
Biju

> 
> >
> >  static inline u32 reg_gen4(struct rcar_canfd_global *gpriv,
> 
> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But when I'm talking to
> journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds

[PATCH v2 5/7] can: rcar_canfd: Add only_internal_clks variable to struct rcar_canfd_hw_info

[Biju Das]

All SoCs supports extenal clock, but RZ/G3E has only internal clocks. Add
only_internal_clks to struct rcar_canfd_hw_info to handle this difference.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
---
v1->v2:
 * No change.
---
 drivers/net/can/rcar/rcar_canfd.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/can/rcar/rcar_canfd.c b/drivers/net/can/rcar/rcar_canfd.c
index 13eb6aa6ae45..f353a9d560e8 100644
--- a/drivers/net/can/rcar/rcar_canfd.c
+++ b/drivers/net/can/rcar/rcar_canfd.c
@@ -517,6 +517,7 @@ struct rcar_canfd_hw_info {
 	unsigned shared_global_irqs:1;	/* Has shared global irqs */
 	unsigned multi_channel_irqs:1;	/* Has multiple channel irqs */
 	unsigned gen4_type:1;		/* Has gen4 type reg layout */
+	unsigned only_internal_clks:1;	/* Has only internal clocks */
 };
 
 /* Channel priv data */
@@ -1943,7 +1944,7 @@ static int rcar_canfd_probe(struct platform_device *pdev)
 		fcan_freq = clk_get_rate(gpriv->can_clk) / info->postdiv;
 	} else {
 		fcan_freq = clk_get_rate(gpriv->can_clk);
-		gpriv->extclk = true;
+		gpriv->extclk = !gpriv->info->only_internal_clks;
 	}
 
 	addr = devm_platform_ioremap_resource(pdev, 0);
-- 
2.43.0

[PATCH v2 6/7] can: rcar_canfd: Enhance multi_channel_irqs handling

[Biju Das]

Currently multi_channel_irqs has only 2 channels. But RZ/G3E has six
channels. Enhance multi_channel_irqs handling to support more than two
channels.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
---
v1->v2:
 * No change.
---
 drivers/net/can/rcar/rcar_canfd.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/can/rcar/rcar_canfd.c b/drivers/net/can/rcar/rcar_canfd.c
index f353a9d560e8..bf2561168e98 100644
--- a/drivers/net/can/rcar/rcar_canfd.c
+++ b/drivers/net/can/rcar/rcar_canfd.c
@@ -1748,16 +1748,19 @@ static int rcar_canfd_channel_probe(struct rcar_canfd_global *gpriv, u32 ch,
 
 	if (info->multi_channel_irqs) {
 		char *irq_name;
+		char name[10];
 		int err_irq;
 		int tx_irq;
 
-		err_irq = platform_get_irq_byname(pdev, ch == 0 ? "ch0_err" : "ch1_err");
+		scnprintf(name, 10, "ch%u_err", ch);
+		err_irq = platform_get_irq_byname(pdev, name);
 		if (err_irq < 0) {
 			err = err_irq;
 			goto fail;
 		}
 
-		tx_irq = platform_get_irq_byname(pdev, ch == 0 ? "ch0_trx" : "ch1_trx");
+		scnprintf(name, 10, "ch%u_trx", ch);
+		tx_irq = platform_get_irq_byname(pdev, name);
 		if (tx_irq < 0) {
 			err = tx_irq;
 			goto fail;
-- 
2.43.0

[PATCH v2 7/7] can: rcar_canfd: Add RZ/G3E support

[Biju Das]

The CAN-FD IP found on the RZ/G3E SoC is similar to R-Car Gen4, but
it has no external clock instead it has clk_ram, it has 6 channels
and supports 20 interrupts. Add support for RZ/G3E CAN-FD driver.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
---
v1->v2:
 * No change.
---
 drivers/net/can/rcar/rcar_canfd.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/net/can/rcar/rcar_canfd.c b/drivers/net/can/rcar/rcar_canfd.c
index bf2561168e98..667d091bbcc9 100644
--- a/drivers/net/can/rcar/rcar_canfd.c
+++ b/drivers/net/can/rcar/rcar_canfd.c
@@ -607,6 +607,14 @@ static const struct rcar_canfd_hw_info rzg2l_hw_info = {
 	.multi_channel_irqs = 1,
 };
 
+static const struct rcar_canfd_hw_info r9a09g047_hw_info = {
+	.max_channels = 6,
+	.postdiv = 1,
+	.multi_channel_irqs = 1,
+	.gen4_type = 1,
+	.only_internal_clks = 1,
+};
+
 /* Helper functions */
 static inline bool is_gen4(struct rcar_canfd_global *gpriv)
 {
@@ -1861,6 +1869,7 @@ static int rcar_canfd_probe(struct platform_device *pdev)
 	u32 rule_entry = 0;
 	bool fdmode = true;			/* CAN FD only mode - default */
 	char name[9] = "channelX";
+	struct clk *clk_ram;
 	int i;
 
 	info = of_device_get_match_data(dev);
@@ -1950,6 +1959,11 @@ static int rcar_canfd_probe(struct platform_device *pdev)
 		gpriv->extclk = !gpriv->info->only_internal_clks;
 	}
 
+	clk_ram = devm_clk_get_optional_enabled(dev, "ram_clk");
+	if (IS_ERR(clk_ram))
+		return dev_err_probe(dev, PTR_ERR(clk_ram),
+				     "cannot get ram clock\n");
+
 	addr = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(addr)) {
 		err = PTR_ERR(addr);
@@ -2112,6 +2126,7 @@ static SIMPLE_DEV_PM_OPS(rcar_canfd_pm_ops, rcar_canfd_suspend,
 
 static const __maybe_unused struct of_device_id rcar_canfd_of_table[] = {
 	{ .compatible = "renesas,r8a779a0-canfd", .data = &rcar_gen4_hw_info },
+	{ .compatible = "renesas,r9a09g047-canfd", .data = &r9a09g047_hw_info },
 	{ .compatible = "renesas,rcar-gen3-canfd", .data = &rcar_gen3_hw_info },
 	{ .compatible = "renesas,rcar-gen4-canfd", .data = &rcar_gen4_hw_info },
 	{ .compatible = "renesas,rzg2l-canfd", .data = &rzg2l_hw_info },
-- 
2.43.0