linux-kernel - [PATCH v3 1/4] can: rcar_canfd: Update bit rate constants for RZ/G3E and R-Car Gen4

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Message-ID: <20250908120940.147196-2-biju.das.jz@bp.renesas.com>
Date: Mon,  8 Sep 2025 13:09:30 +0100
From: Biju <biju.das.au@...il.com>
To: Marc Kleine-Budde <mkl@...gutronix.de>,
	Vincent Mailhol <mailhol.vincent@...adoo.fr>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Magnus Damm <magnus.damm@...il.com>
Cc: Biju Das <biju.das.jz@...renesas.com>,
	linux-can@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>,
	Biju Das <biju.das.au@...il.com>
Subject: [PATCH v3 1/4] can: rcar_canfd: Update bit rate constants for RZ/G3E and R-Car Gen4

From: Biju Das <biju.das.jz@...renesas.com>

The calculation formula for nominal bit rate of classical CAN is same as
that of nominal bit rate of CANFD on the RZ/G3E and R-Car Gen4 SoCs
compared to other SoCs. Update nominal bit rate constants.

Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
---
v2->v3:
 * Replaced "shared_bittiming"->"shared_can_regs" as it is same for RZ/G3E
   and R-Car Gen4.
 * Dropped the tags as it is new change.
 * Updated commit header and description.
v1->v2:
 * No change.
---
 drivers/net/can/rcar/rcar_canfd.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/can/rcar/rcar_canfd.c b/drivers/net/can/rcar/rcar_canfd.c
index b3c8c592fb0e..4185fc5b4a70 100644
--- a/drivers/net/can/rcar/rcar_canfd.c
+++ b/drivers/net/can/rcar/rcar_canfd.c
@@ -1912,7 +1912,10 @@ static int rcar_canfd_channel_probe(struct rcar_canfd_global *gpriv, u32 ch,
 		priv->can.fd.do_get_auto_tdcv = rcar_canfd_get_auto_tdcv;
 	} else {
 		/* Controller starts in Classical CAN only mode */
-		priv->can.bittiming_const = &rcar_canfd_bittiming_const;
+		if (gpriv->info->shared_can_regs)
+			priv->can.bittiming_const = gpriv->info->nom_bittiming;
+		else
+			priv->can.bittiming_const = &rcar_canfd_bittiming_const;
 		priv->can.ctrlmode_supported = CAN_CTRLMODE_BERR_REPORTING;
 	}
 
-- 
2.43.0