linux-kernel - [PATCH v3 0/4] R-Car CANFD Improvements

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Message-ID: <20250908120940.147196-1-biju.das.jz@bp.renesas.com>
Date: Mon,  8 Sep 2025 13:09:29 +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 0/4] R-Car CANFD Improvements

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 SoC and R-Car Gen4
compared to other SoCs. Update the nominal bit rate constants.

Apart from this, for replacing function-like macros, introduced
rcar_canfd_compute_{nominal,data}_bit_rate_cfg().

v2->v3:
 * Replaced "shared_bittiming"->"shared_can_regs" as it is same for RZ/G3E
   and R-Car Gen4.
 * Updated commit header and description for patch#1.
 * Added Rb tag from Geert for patch #2,#3 and #4.
 * Dropped _MASK suffix from RCANFD_CFG_* macros.
 * Dropped _MASK suffix from RCANFD_NCFG_NBRP_MASK macro.
 * Dropped _MASK suffix from the macro RCANFD_DCFG_DBRP_MASK.
 * Followed the order as used in struct can_bittiming{_const} for easy
   maintenance.
v1->v2:
 * Dropped patch#2 as it is accepted.
 * Moved patch#4 to patch#2.
 * Updated commit header and description for patch#2.
 * Kept RCANFD_CFG* macro definitions to give a meaning to the magic
   number using GENMASK macro and used FIELD_PREP to extract value.
 * Split patch#3 for computing nominal  and data bit rate config separate.
 * Updated rcar_canfd_compute_nominal_bit_rate_cfg() to handle
   nominal bit rate configuration for both classical CAN and CANFD.
 * Replaced RCANFD_NCFG_NBRP->RCANFD_NCFG_NBRP_MASK and used FIELD_PREP to
   extract value.
 * Replaced RCANFD_DCFG_DBRP->RCANFD_DCFG_DBRP_MASK and used FIELD_PREP to
   extract value.

Biju Das (4):
  can: rcar_canfd: Update bit rate constants for RZ/G3E and R-Car Gen4
  can: rcar_canfd: Update RCANFD_CFG_* macros
  can: rcar_canfd: Simplify nominal bit rate config
  can: rcar_canfd: Simplify data bit rate config

 drivers/net/can/rcar/rcar_canfd.c | 84 +++++++++++++++++--------------
 1 file changed, 47 insertions(+), 37 deletions(-)

-- 
2.43.0