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[86.162.200.138]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-42b53e85e6fsm32487590f8f.18.2025.11.18.06.18.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 18 Nov 2025 06:18:43 -0800 (PST) From: Biju X-Google-Original-From: Biju To: Marc Kleine-Budde , Vincent Mailhol , Geert Uytterhoeven , Magnus Damm Cc: Biju Das , linux-can@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-kernel@vger.kernel.org, Prabhakar Mahadev Lad , Biju Das Subject: [PATCH 2/2] can: rcar_canfd: Add support for FD-Only mode Date: Tue, 18 Nov 2025 14:18:35 +0000 Message-ID: <20251118141840.267652-3-biju.das.jz@bp.renesas.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251118141840.267652-1-biju.das.jz@bp.renesas.com> References: <20251118141840.267652-1-biju.das.jz@bp.renesas.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Biju Das The RZ/{G2L,G3E} and R-Car Gen4 SoCs support additional CAN FD mode called FD-only mode. In this mode, communication in Classical CAN frame format is disabled. Signed-off-by: Biju Das --- drivers/net/can/rcar/rcar_canfd.c | 24 +++++++++++++++++++++++- 1 file changed, 23 insertions(+), 1 deletion(-) diff --git a/drivers/net/can/rcar/rcar_canfd.c b/drivers/net/can/rcar/rcar_= canfd.c index 05dbdf46dd6f..6dc6bb1efceb 100644 --- a/drivers/net/can/rcar/rcar_canfd.c +++ b/drivers/net/can/rcar/rcar_canfd.c @@ -444,6 +444,7 @@ struct rcar_canfd_hw_info { unsigned ch_interface_mode:1; /* Has channel interface mode */ unsigned shared_can_regs:1; /* Has shared classical can registers */ unsigned external_clk:1; /* Has external clock */ + unsigned has_fd_only_mode:1; /* Has FD-Only mode */ }; =20 /* Channel priv data */ @@ -471,6 +472,7 @@ struct rcar_canfd_global { unsigned long channels_mask; /* Enabled channels mask */ bool extclk; /* CANFD or Ext clock */ bool fdmode; /* CAN FD or Classical CAN only mode */ + bool fd_only_mode; /* FD-Only mode for CAN-FD */ struct reset_control *rstc1; struct reset_control *rstc2; const struct rcar_canfd_hw_info *info; @@ -615,6 +617,7 @@ static const struct rcar_canfd_hw_info rcar_gen3_hw_inf= o =3D { .ch_interface_mode =3D 0, .shared_can_regs =3D 0, .external_clk =3D 1, + .has_fd_only_mode =3D 0, }; =20 static const struct rcar_canfd_hw_info rcar_gen4_hw_info =3D { @@ -632,6 +635,7 @@ static const struct rcar_canfd_hw_info rcar_gen4_hw_inf= o =3D { .ch_interface_mode =3D 1, .shared_can_regs =3D 1, .external_clk =3D 1, + .has_fd_only_mode =3D 1, }; =20 static const struct rcar_canfd_hw_info rzg2l_hw_info =3D { @@ -649,6 +653,7 @@ static const struct rcar_canfd_hw_info rzg2l_hw_info = =3D { .ch_interface_mode =3D 0, .shared_can_regs =3D 0, .external_clk =3D 1, + .has_fd_only_mode =3D 1, }; =20 static const struct rcar_canfd_hw_info r9a09g047_hw_info =3D { @@ -666,6 +671,7 @@ static const struct rcar_canfd_hw_info r9a09g047_hw_inf= o =3D { .ch_interface_mode =3D 1, .shared_can_regs =3D 1, .external_clk =3D 0, + .has_fd_only_mode =3D 1, }; =20 /* Helper functions */ @@ -828,12 +834,20 @@ static int rcar_canfd_reset_controller(struct rcar_ca= nfd_global *gpriv) RCANFD_GEN4_FDCFG_FDOE); rcar_canfd_set_bit_reg(&gpriv->fcbase[ch].cfdcfg, RCANFD_GEN4_FDCFG_CLOE); + } else if (gpriv->fd_only_mode) { + rcar_canfd_clear_bit_reg(&gpriv->fcbase[ch].cfdcfg, + RCANFD_GEN4_FDCFG_CLOE); + rcar_canfd_set_bit_reg(&gpriv->fcbase[ch].cfdcfg, + RCANFD_GEN4_FDCFG_FDOE); } else { rcar_canfd_clear_bit_reg(&gpriv->fcbase[ch].cfdcfg, RCANFD_GEN4_FDCFG_FDOE); rcar_canfd_clear_bit_reg(&gpriv->fcbase[ch].cfdcfg, RCANFD_GEN4_FDCFG_CLOE); } + } else if (gpriv->fd_only_mode) { + rcar_canfd_set_bit_reg(&gpriv->fcbase[ch].cfdcfg, + RCANFD_GEN4_FDCFG_FDOE); } } =20 @@ -2041,6 +2055,14 @@ static int rcar_canfd_probe(struct platform_device *= pdev) gpriv->fdmode =3D fdmode; gpriv->info =3D info; =20 + if (of_property_read_bool(dev->of_node, "renesas,fd-only")) { + if (!info->has_fd_only_mode) + return dev_err_probe(dev, EOPNOTSUPP, + "fd-only mode not supported\n"); + + gpriv->fd_only_mode =3D true; /* FD-Only mode for CAN-FD */ + } + gpriv->rstc1 =3D devm_reset_control_get_optional_exclusive(dev, "rstp_n"); if (IS_ERR(gpriv->rstc1)) return dev_err_probe(dev, PTR_ERR(gpriv->rstc1), @@ -2190,7 +2212,7 @@ static int rcar_canfd_probe(struct platform_device *p= dev) platform_set_drvdata(pdev, gpriv); dev_info(dev, "global operational state (%s clk, %s mode)\n", gpriv->extclk ? "ext" : "canfd", - gpriv->fdmode ? "fd" : "classical"); + gpriv->fdmode ? (gpriv->fd_only_mode ? "fd-only" : "fd") : "classical"); return 0; =20 fail_channel: --=20 2.43.0