can: rcar_canfd: Add postdiv to struct rcar_canfd_hw_info

R-Car has a clock divider for CAN FD clock within the IP, whereas
it is not available on RZ/G2L.

Add postdiv variable to struct rcar_canfd_hw_info to take care of this
difference.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/all/20221027082158.95895-5-biju.das.jz@bp.renesas.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/drivers/net/can/rcar/rcar_canfd.c b/drivers/net/can/rcar/rcar_canfd.c
index 8a0d2c6..16294a7 100644 (file)
--- a/drivers/net/can/rcar/rcar_canfd.c
+++ b/drivers/net/can/rcar/rcar_canfd.c
@@ -525,6 +525,7 @@ struct rcar_canfd_global;
 struct rcar_canfd_hw_info {
        enum rcanfd_chip_id chip_id;
        u8 max_channels;
+       u8 postdiv;
        /* hardware features */
        unsigned shared_global_irqs:1;  /* Has shared global irqs */
 };
@@ -599,17 +600,20 @@ static const struct can_bittiming_const rcar_canfd_bittiming_const = {
 static const struct rcar_canfd_hw_info rcar_gen3_hw_info = {
        .chip_id = RENESAS_RCAR_GEN3,
        .max_channels = 2,
+       .postdiv = 2,
        .shared_global_irqs = 1,
 };
 
 static const struct rcar_canfd_hw_info rzg2l_hw_info = {
        .chip_id = RENESAS_RZG2L,
+       .postdiv = 1,
        .max_channels = 2,
 };
 
 static const struct rcar_canfd_hw_info r8a779a0_hw_info = {
        .chip_id = RENESAS_R8A779A0,
        .max_channels = 8,
+       .postdiv = 2,
        .shared_global_irqs = 1,
 };
 
@@ -1938,9 +1942,9 @@ static int rcar_canfd_probe(struct platform_device *pdev)
        }
        fcan_freq = clk_get_rate(gpriv->can_clk);
 
-       if (gpriv->fcan == RCANFD_CANFDCLK && info->chip_id != RENESAS_RZG2L)
+       if (gpriv->fcan == RCANFD_CANFDCLK)
                /* CANFD clock is further divided by (1/2) within the IP */
-               fcan_freq /= 2;
+               fcan_freq /= info->postdiv;
 
        addr = devm_platform_ioremap_resource(pdev, 0);
        if (IS_ERR(addr)) {