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From: Biju Das <biju.das.jz@bp.renesas.com>
To: cip-dev@lists.cip-project.org,
	Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>,
	Pavel Machek <pavel@denx.de>
Cc: Chris Paterson <chris.paterson2@renesas.com>,
	Biju Das <biju.das.jz@bp.renesas.com>,
	Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@bp.renesas.com>
Subject: [PATCH 5.10.y-cip 6/7] can: rcar_canfd: Add postdiv to struct rcar_canfd_hw_info
Date: Tue, 13 Dec 2022 17:23:15 +0000	[thread overview]
Message-ID: <20221213172316.1848032-7-biju.das.jz@bp.renesas.com> (raw)
In-Reply-To: <20221213172316.1848032-1-biju.das.jz@bp.renesas.com>

commit a1dcfbdfd1d0f7843f381f7c58cc87a0f8c11f6c upstream.

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>
[biju: Dropped RCar V3U related changes]
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
---
 drivers/net/can/rcar/rcar_canfd.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/can/rcar/rcar_canfd.c b/drivers/net/can/rcar/rcar_canfd.c
index 6480e8835dc6..fa0b3de0b628 100644
--- a/drivers/net/can/rcar/rcar_canfd.c
+++ b/drivers/net/can/rcar/rcar_canfd.c
@@ -496,6 +496,7 @@ struct rcar_canfd_global;
 
 struct rcar_canfd_hw_info {
 	enum rcanfd_chip_id chip_id;
+	u8 postdiv;
 	/* hardware features */
 	unsigned shared_global_irqs:1;	/* Has shared global irqs */
 };
@@ -570,11 +571,13 @@ 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,
+	.postdiv = 2,
 	.shared_global_irqs = 1,
 };
 
 static const struct rcar_canfd_hw_info rzg2l_hw_info = {
 	.chip_id = RENESAS_RZG2L,
+	.postdiv = 1,
 };
 
 /* Helper functions */
@@ -1861,9 +1864,9 @@ 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_RCAR_GEN3)
+	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)) {
-- 
2.25.1



  parent reply	other threads:[~2022-12-13 17:23 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-12-13 17:23 [PATCH 5.10.y-cip 0/7] CANFD Improvement Biju Das
2022-12-13 17:23 ` [PATCH 5.10.y-cip 1/7] can: rcar_canfd: rcar_canfd_handle_global_receive(): fix IRQ storm on global FIFO receive Biju Das
2022-12-13 17:23 ` [PATCH 5.10.y-cip 2/7] can: rcar_canfd: Add missing ECC error checks for channels 2-7 Biju Das
2022-12-13 17:23 ` [PATCH 5.10.y-cip 3/7] can: rcar_canfd: Use devm_reset_control_get_optional_exclusive Biju Das
2022-12-13 17:23 ` [PATCH 5.10.y-cip 4/7] can: rcar_canfd: rcar_canfd_probe: Add struct rcar_canfd_hw_info to driver data Biju Das
2022-12-13 17:23 ` [PATCH 5.10.y-cip 5/7] can: rcar_canfd: Add shared_global_irqs to struct rcar_canfd_hw_info Biju Das
2022-12-13 17:23 ` Biju Das [this message]
2022-12-13 17:23 ` [PATCH 5.10.y-cip 7/7] can: rcar_canfd: Add multi_channel_irqs " Biju Das
2022-12-13 18:52 ` [PATCH 5.10.y-cip 0/7] CANFD Improvement Pavel Machek
2022-12-16  9:39 ` Pavel Machek

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