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can: rcar_canfd: Add support for FD-Only mode

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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 <biju.das.jz@bp.renesas.com>
Link: https://patch.msgid.link/20251126155911.320563-3-biju.das.jz@bp.renesas.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Biju Das 2025-11-26 15:59:07 +00:00 committed by Marc Kleine-Budde
parent 1766de15a5
commit 9a2b56a48c
1 changed files with 13 additions and 1 deletions
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14
drivers/net/can/rcar/rcar_canfd.c
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@ -472,6 +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;
@ -829,12 +830,20 @@ static int rcar_canfd_reset_controller(struct rcar_canfd_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);
}
}
@ -2140,6 +2149,9 @@ static int rcar_canfd_probe(struct platform_device *pdev)
gpriv->fdmode = fdmode;
gpriv->info = info;
if (of_property_read_bool(dev->of_node, "renesas,fd-only"))
gpriv->fd_only_mode = true; /* FD-Only mode for CAN-FD */
gpriv->rstc1 = devm_reset_control_get_optional_exclusive(dev, "rstp_n");
if (IS_ERR(gpriv->rstc1))
return dev_err_probe(dev, PTR_ERR(gpriv->rstc1),
@ -2239,7 +2251,7 @@ static int rcar_canfd_probe(struct platform_device *pdev)
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;
fail_channel: