[PATCH v3 0/3] Add support for Renesas RZ/G3L CANFD

[PATCH v3 0/3] Add support for Renesas RZ/G3L CANFD

[Biju Das]

Add support for Renesas RZ/G3L CANFD.
The RZ/G3L CANFD IP has 3 channels and 11 interrupts compared to 2 channels
and 8 interrupts that of RZ/G3S. RZ/G3L has 288 buffers compared to 192
buffers on RZ/G3S SoC.

This patch series depend upon [1]
[1] https://lore.kernel.org/all/20260902141544.565763-1-claudiu.beznea+renesas@tuxon.dev/

v2->v3:
 * Collected tags.
 * Added check against RCANFD_NUM_CHANNELS, to avoid overrunning the
   fixed-size rcar_canfd_global.ch[] and transceivers[] arrays.
 * Fixed typo 198->192 buffers in commit description.
v1->v2:
 * Added support for deriving max_channels from the device tree.
 * Dropped clock patch as it is accepted.
 * Dropped devicetree patches, will send it later.
 * Updated commit description
 * Dropped RZ/G3S fallback as there are lot of differences.

Biju Das (3):
  dt-bindings: can: renesas,rcar-canfd: Document RZ/G3L SoC
  can: rcar_canfd: Derive max_channels from the device tree
  can: rcar_canfd: Add support for Renesas RZ/G3L

 .../bindings/net/can/renesas,rcar-canfd.yaml  | 27 ++++++++++++-
 drivers/net/can/rcar/rcar_canfd.c             | 40 +++++++++----------
 2 files changed, 46 insertions(+), 21 deletions(-)

-- 
2.43.0

[PATCH v3 1/3] dt-bindings: can: renesas,rcar-canfd: Document RZ/G3L SoC

[Biju Das]

Document the RZ/G3L (R9A08G046) SoC support.

RZ/G3L has 11 interrupts and 3 CANFD channels compared to 8 interrupts
and 2 CANFD channels on RZ/G3S. RZ/G3L has 288 buffers in total
compared to 192 buffers in RZ/G3S.

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
---
v2->v3:
 * Collected tag.
v1->v2:
 * Updated commit description
 * Dropped RZ/G3S fallback as there are lot of differences.
---
 .../bindings/net/can/renesas,rcar-canfd.yaml  | 27 ++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml b/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml
index bbaaef8f4282..71b756c26cec 100644
--- a/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml
+++ b/Documentation/devicetree/bindings/net/can/renesas,rcar-canfd.yaml
@@ -14,6 +14,7 @@ properties:
     oneOf:
       - enum:
           - renesas,r9a08g045-canfd        # RZ/G3S
+          - renesas,r9a08g046-canfd        # RZ/G3L
           - renesas,r9a09g047-canfd        # RZ/G3E
           - renesas,r9a09g077-canfd        # RZ/T2H
 
@@ -292,6 +293,28 @@ allOf:
       patternProperties:
         "^channel[6-7]$": false
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: renesas,r9a08g046-canfd
+    then:
+      properties:
+        interrupts:
+          minItems: 11
+          maxItems: 11
+
+        interrupt-names:
+          minItems: 11
+          maxItems: 11
+
+        resets:
+          minItems: 2
+          maxItems: 2
+
+      patternProperties:
+        "^channel[3-7]$": false
+
   - if:
       properties:
         compatible:
@@ -356,7 +379,9 @@ allOf:
       properties:
         compatible:
           contains:
-            const: renesas,r9a08g045-canfd
+            enum:
+              - renesas,r9a08g045-canfd
+              - renesas,r9a08g046-canfd
     then:
       properties:
         renesas,no-can-fd: false
-- 
2.43.0

[PATCH v3 2/3] can: rcar_canfd: Derive max_channels from the device tree

[Biju Das]

The maximum number of channels is currently hardcoded per SoC in
struct rcar_canfd_hw_info. Since the DT describes the channels as
child nodes of the controller, the count can be obtained at probe time
with of_get_child_count() instead.

Drop max_channels from struct rcar_canfd_hw_info and store the value
in struct rcar_canfd_global, so it no longer needs to be maintained
for each SoC variant. Update all for_each_set_bit() users over
channels_mask to use gpriv->max_channels.

No functional change.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
---
v2->v3:
 * Added check against RCANFD_NUM_CHANNELS, to avoid overrunning the
   fixed-size rcar_canfd_global.ch[] and transceivers[] arrays.
v2:
 * New patch
---
 drivers/net/can/rcar/rcar_canfd.c | 39 +++++++++++++++----------------
 1 file changed, 19 insertions(+), 20 deletions(-)

diff --git a/drivers/net/can/rcar/rcar_canfd.c b/drivers/net/can/rcar/rcar_canfd.c
index 74c3c3f20991..41c395118949 100644
--- a/drivers/net/can/rcar/rcar_canfd.c
+++ b/drivers/net/can/rcar/rcar_canfd.c
@@ -436,7 +436,6 @@ struct rcar_canfd_hw_info {
 	u8 rnc_field_width;
 	u8 max_aflpn;
 	u8 max_cftml;
-	u8 max_channels;
 	u8 postdiv;
 	/* hardware features */
 	unsigned shared_global_irqs:1;	/* Has shared global irqs */
@@ -478,6 +477,7 @@ struct rcar_canfd_global {
 	struct reset_control *rstc1;
 	struct reset_control *rstc2;
 	const struct rcar_canfd_hw_info *info;
+	u8 max_channels;
 };
 
 /* CAN FD mode nominal rate constants */
@@ -613,7 +613,6 @@ static const struct rcar_canfd_hw_info rcar_gen3_hw_info = {
 	.rnc_field_width = 8,
 	.max_aflpn = 31,
 	.max_cftml = 15,
-	.max_channels = 2,
 	.postdiv = 2,
 	.shared_global_irqs = 1,
 	.ch_interface_mode = 0,
@@ -632,7 +631,6 @@ static const struct rcar_canfd_hw_info rcar_gen4_hw_info = {
 	.rnc_field_width = 16,
 	.max_aflpn = 127,
 	.max_cftml = 31,
-	.max_channels = 8,
 	.postdiv = 2,
 	.shared_global_irqs = 1,
 	.ch_interface_mode = 1,
@@ -651,7 +649,6 @@ static const struct rcar_canfd_hw_info rzg2l_hw_info = {
 	.rnc_field_width = 8,
 	.max_aflpn = 31,
 	.max_cftml = 15,
-	.max_channels = 2,
 	.postdiv = 1,
 	.multi_channel_irqs = 1,
 	.ch_interface_mode = 0,
@@ -670,7 +667,6 @@ static const struct rcar_canfd_hw_info r9a08g045_hw_info = {
 	.rnc_field_width = 16,
 	.max_aflpn = 15,
 	.max_cftml = 31,
-	.max_channels = 2,
 	.postdiv = 2,
 	.shared_global_irqs = 0,
 	.multi_channel_irqs = 1,
@@ -690,7 +686,6 @@ static const struct rcar_canfd_hw_info r9a09g047_hw_info = {
 	.rnc_field_width = 16,
 	.max_aflpn = 63,
 	.max_cftml = 31,
-	.max_channels = 6,
 	.postdiv = 1,
 	.multi_channel_irqs = 1,
 	.ch_interface_mode = 1,
@@ -709,7 +704,6 @@ static const struct rcar_canfd_hw_info r9a09g077_hw_info = {
 	.rnc_field_width = 16,
 	.max_aflpn = 15,
 	.max_cftml = 31,
-	.max_channels = 2,
 	.postdiv = 1,
 	.multi_channel_irqs = 1,
 	.ch_interface_mode = 1,
@@ -854,7 +848,7 @@ static int rcar_canfd_reset_controller(struct rcar_canfd_global *gpriv)
 	}
 
 	/* Transition all Channels to reset mode */
-	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->info->max_channels) {
+	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->max_channels) {
 		rcar_canfd_clear_bit(gpriv->base,
 				     RCANFD_CCTR(ch), RCANFD_CCTR_CSLPR);
 
@@ -922,7 +916,7 @@ static void rcar_canfd_configure_controller(struct rcar_canfd_global *gpriv)
 	rcar_canfd_set_bit(gpriv->base, RCANFD_GCFG, cfg);
 
 	/* Channel configuration settings */
-	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->info->max_channels) {
+	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->max_channels) {
 		rcar_canfd_set_bit(gpriv->base, RCANFD_CCTR(ch),
 				   RCANFD_CCTR_ERRD);
 		rcar_canfd_update_bit(gpriv->base, RCANFD_CCTR(ch),
@@ -1293,7 +1287,7 @@ static irqreturn_t rcar_canfd_global_err_interrupt(int irq, void *dev_id)
 	struct rcar_canfd_global *gpriv = dev_id;
 	u32 ch;
 
-	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->info->max_channels)
+	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->max_channels)
 		rcar_canfd_handle_global_err(gpriv, ch);
 
 	return IRQ_HANDLED;
@@ -1325,7 +1319,7 @@ static irqreturn_t rcar_canfd_global_receive_fifo_interrupt(int irq, void *dev_i
 	struct rcar_canfd_global *gpriv = dev_id;
 	u32 ch;
 
-	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->info->max_channels)
+	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->max_channels)
 		rcar_canfd_handle_global_receive(gpriv, ch);
 
 	return IRQ_HANDLED;
@@ -1339,7 +1333,7 @@ static irqreturn_t rcar_canfd_global_interrupt(int irq, void *dev_id)
 	/* Global error interrupts still indicate a condition specific
 	 * to a channel. RxFIFO interrupt is a global interrupt.
 	 */
-	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->info->max_channels) {
+	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->max_channels) {
 		rcar_canfd_handle_global_err(gpriv, ch);
 		rcar_canfd_handle_global_receive(gpriv, ch);
 	}
@@ -1435,7 +1429,7 @@ static irqreturn_t rcar_canfd_channel_interrupt(int irq, void *dev_id)
 	u32 ch;
 
 	/* Common FIFO is a per channel resource */
-	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->info->max_channels) {
+	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->max_channels) {
 		rcar_canfd_handle_channel_err(gpriv, ch);
 		rcar_canfd_handle_channel_tx(gpriv, ch);
 	}
@@ -2072,7 +2066,7 @@ static int rcar_canfd_global_init(struct rcar_canfd_global *gpriv)
 	rcar_canfd_configure_controller(gpriv);
 
 	/* Configure per channel attributes */
-	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->info->max_channels) {
+	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->max_channels) {
 		/* Configure Channel's Rx fifo */
 		rcar_canfd_configure_rx(gpriv, ch);
 
@@ -2145,14 +2139,18 @@ static int rcar_canfd_probe(struct platform_device *pdev)
 	bool fdmode = true;			/* CAN FD only mode - default */
 	char name[9] = "channelX";
 	u32 ch, fcan_freq;
+	u8 max_channels;
 	int i;
 
 	info = of_device_get_match_data(dev);
+	max_channels = of_get_child_count(dev->of_node);
+	if (max_channels > RCANFD_NUM_CHANNELS)
+		return -EINVAL;
 
 	if (of_property_read_bool(dev->of_node, "renesas,no-can-fd"))
 		fdmode = false;			/* Classical CAN only mode */
 
-	for (i = 0; i < info->max_channels; ++i) {
+	for (i = 0; i < max_channels; ++i) {
 		name[7] = '0' + i;
 		of_child = of_get_available_child_by_name(dev->of_node, name);
 		if (of_child) {
@@ -2199,6 +2197,7 @@ static int rcar_canfd_probe(struct platform_device *pdev)
 	gpriv->pdev = pdev;
 	gpriv->channels_mask = channels_mask;
 	gpriv->fdmode = fdmode;
+	gpriv->max_channels = max_channels;
 	gpriv->info = info;
 
 	if (of_property_read_bool(dev->of_node, "renesas,fd-only"))
@@ -2300,7 +2299,7 @@ static int rcar_canfd_probe(struct platform_device *pdev)
 	if (err)
 		goto fail_mode;
 
-	for_each_set_bit(ch, &gpriv->channels_mask, info->max_channels) {
+	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->max_channels) {
 		err = rcar_canfd_channel_probe(gpriv, ch, fcan_freq,
 					       transceivers[ch]);
 		if (err)
@@ -2314,7 +2313,7 @@ static int rcar_canfd_probe(struct platform_device *pdev)
 	return 0;
 
 fail_channel:
-	for_each_set_bit(ch, &gpriv->channels_mask, info->max_channels)
+	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->max_channels)
 		rcar_canfd_channel_remove(gpriv, ch);
 fail_mode:
 	rcar_canfd_global_deinit(gpriv, false);
@@ -2327,7 +2326,7 @@ static void rcar_canfd_remove(struct platform_device *pdev)
 	struct rcar_canfd_global *gpriv = platform_get_drvdata(pdev);
 	u32 ch;
 
-	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->info->max_channels) {
+	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->max_channels) {
 		rcar_canfd_disable_channel_interrupts(gpriv->ch[ch]);
 		rcar_canfd_channel_remove(gpriv, ch);
 	}
@@ -2341,7 +2340,7 @@ static int rcar_canfd_suspend(struct device *dev)
 	int err;
 	u32 ch;
 
-	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->info->max_channels) {
+	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->max_channels) {
 		struct rcar_canfd_channel *priv = gpriv->ch[ch];
 		struct net_device *ndev = priv->ndev;
 
@@ -2378,7 +2377,7 @@ static int rcar_canfd_resume(struct device *dev)
 		return err;
 	}
 
-	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->info->max_channels) {
+	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->max_channels) {
 		struct rcar_canfd_channel *priv = gpriv->ch[ch];
 		struct net_device *ndev = priv->ndev;
 
-- 
2.43.0

[PATCH v3 3/3] can: rcar_canfd: Add support for Renesas RZ/G3L

[Biju Das]

Add support for Renesas RZ/G3L CANFD IP. RZ/G3L has 3 channels and
11 interrupts, compared 2 channels and 8 interrupts on RZ/G3S.
RZ/G3L has 288 buffers compared to 192 buffers on RZ/G3S.

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
---
v2->v3:
 * Fixed the typo 198->192 buffers in commit description.
 * Collected the tag.
v1->v2:
 * Updated commit description
 * Dropped RZ/G3S fallback
---
 drivers/net/can/rcar/rcar_canfd.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/can/rcar/rcar_canfd.c b/drivers/net/can/rcar/rcar_canfd.c
index 41c395118949..c64387967368 100644
--- a/drivers/net/can/rcar/rcar_canfd.c
+++ b/drivers/net/can/rcar/rcar_canfd.c
@@ -2403,6 +2403,7 @@ static DEFINE_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,r9a08g045-canfd", .data = &r9a08g045_hw_info },
+	{ .compatible = "renesas,r9a08g046-canfd", .data = &r9a08g045_hw_info },
 	{ .compatible = "renesas,r9a09g047-canfd", .data = &r9a09g047_hw_info },
 	{ .compatible = "renesas,r9a09g077-canfd", .data = &r9a09g077_hw_info },
 	{ .compatible = "renesas,rcar-gen3-canfd", .data = &rcar_gen3_hw_info },
-- 
2.43.0

Re: [PATCH v3 2/3] can: rcar_canfd: Derive max_channels from the device tree

[Geert Uytterhoeven]

On Fri, 25 Sept 2026 at 10:22, Biju Das <biju.das.jz@bp.renesas.com> wrote:
> The maximum number of channels is currently hardcoded per SoC in
> struct rcar_canfd_hw_info. Since the DT describes the channels as
> child nodes of the controller, the count can be obtained at probe time
> with of_get_child_count() instead.
>
> Drop max_channels from struct rcar_canfd_hw_info and store the value
> in struct rcar_canfd_global, so it no longer needs to be maintained
> for each SoC variant. Update all for_each_set_bit() users over
> channels_mask to use gpriv->max_channels.
>
> No functional change.
>
> Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
> ---
> v2->v3:
>  * Added check against RCANFD_NUM_CHANNELS, to avoid overrunning the
>    fixed-size rcar_canfd_global.ch[] and transceivers[] arrays.

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

Re: [PATCH v3 2/3] can: rcar_canfd: Derive max_channels from the device tree

[Claudiu Beznea]

On 9/25/26 11:21, Biju Das wrote:
> The maximum number of channels is currently hardcoded per SoC in
> struct rcar_canfd_hw_info. Since the DT describes the channels as
> child nodes of the controller, the count can be obtained at probe time
> with of_get_child_count() instead.
> 
> Drop max_channels from struct rcar_canfd_hw_info and store the value
> in struct rcar_canfd_global, so it no longer needs to be maintained
> for each SoC variant. Update all for_each_set_bit() users over
> channels_mask to use gpriv->max_channels.
> 
> No functional change.
> 
> Signed-off-by: Biju Das<biju.das.jz@bp.renesas.com>

Reviewed-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>

Re: [PATCH v3 3/3] can: rcar_canfd: Add support for Renesas RZ/G3L

[Claudiu Beznea]

On 9/25/26 11:21, Biju Das wrote:
> Add support for Renesas RZ/G3L CANFD IP. RZ/G3L has 3 channels and
> 11 interrupts, compared 2 channels and 8 interrupts on RZ/G3S.
> RZ/G3L has 288 buffers compared to 192 buffers on RZ/G3S.
> 
> Reviewed-by: Geert Uytterhoeven<geert+renesas@glider.be>
> Signed-off-by: Biju Das<biju.das.jz@bp.renesas.com>

Reviewed-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>

Re: [PATCH v3 0/3] Add support for Renesas RZ/G3L CANFD

[Marc Kleine-Budde]

[-- Attachment #1: Type: text/plain, Size: 749 bytes --]

On 25.09.2026 09:21:27, Biju Das wrote:
> Add support for Renesas RZ/G3L CANFD.
> The RZ/G3L CANFD IP has 3 channels and 11 interrupts compared to 2 channels
> and 8 interrupts that of RZ/G3S. RZ/G3L has 288 buffers compared to 192
> buffers on RZ/G3S SoC.
>
> This patch series depend upon [1]
> [1] https://lore.kernel.org/all/20260902141544.565763-1-claudiu.beznea+renesas@tuxon.dev/

Is the DT bindings update (#1/3) going through the Renesas tree?

regards,
Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde          |
Embedded Linux                   | https://www.pengutronix.de |
Vertretung Nürnberg              | Phone: +49-5121-206917-129 |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-9   |

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 228 bytes --]

RE: [PATCH v3 0/3] Add support for Renesas RZ/G3L CANFD

[Biju Das]

Hi Marc,

> -----Original Message-----
> From: Marc Kleine-Budde <mkl@pengutronix.de>
> Sent: 29 September 2026 15:24
> Subject: Re: [PATCH v3 0/3] Add support for Renesas RZ/G3L CANFD
> 
> On 25.09.2026 09:21:27, Biju Das wrote:
> > Add support for Renesas RZ/G3L CANFD.
> > The RZ/G3L CANFD IP has 3 channels and 11 interrupts compared to 2
> > channels and 8 interrupts that of RZ/G3S. RZ/G3L has 288 buffers
> > compared to 192 buffers on RZ/G3S SoC.
> >
> > This patch series depend upon [1]
> > [1]
> > https://lore.kernel.org/all/20260902141544.565763-1-claudiu.beznea+ren
> > esas@tuxon.dev/
> 
> Is the DT bindings update (#1/3) going through the Renesas tree?

No, It is through CAN tree.

Cheers,
Biju

Re: [PATCH v3 1/3] dt-bindings: can: renesas,rcar-canfd: Document RZ/G3L SoC

[Krzysztof Kozlowski]

On Fri, Sep 25, 2026 at 09:21:28AM +0100, Biju Das wrote:
> +    then:
> +      properties:
> +        interrupts:
> +          minItems: 11
> +          maxItems: 11
> +
> +        interrupt-names:
> +          minItems: 11
> +          maxItems: 11
> +
> +        resets:
> +          minItems: 2
> +          maxItems: 2

Drop maxItems

I'll fix existing code.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>

Best regards,
Krzysztof