From a1dcfbdfd1d0f7843f381f7c58cc87a0f8c11f6c Mon Sep 17 00:00:00 2001
From: Biju Das <biju.das.jz@bp.renesas.com>
Date: Thu, 27 Oct 2022 09:21:56 +0100
Subject: [PATCH] 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>
---
drivers/net/can/rcar/rcar_canfd.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/net/can/rcar/rcar_canfd.c b/drivers/net/can/rcar/rcar_canfd.c
index 8a0d2c64dd3ef..16294a78320e1 100644
--- 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)) {