From: Marc Kleine-Budde <mkl@pengutronix.de>
To: netdev@vger.kernel.org
Cc: davem@davemloft.net, kuba@kernel.org, linux-can@vger.kernel.org,
kernel@pengutronix.de, Biju Das <biju.das.jz@bp.renesas.com>,
Marc Kleine-Budde <mkl@pengutronix.de>
Subject: [PATCH net-next 09/29] can: sja1000: Add Quirk for RZ/N1 SJA1000 CAN controller
Date: Wed, 20 Jul 2022 10:10:14 +0200 [thread overview]
Message-ID: <20220720081034.3277385-10-mkl@pengutronix.de> (raw)
In-Reply-To: <20220720081034.3277385-1-mkl@pengutronix.de>
From: Biju Das <biju.das.jz@bp.renesas.com>
As per Chapter 6.5.16 of the RZ/N1 Peripheral Manual, The SJA1000
CAN controller does not support Clock Divider Register compared to
the reference Philips SJA1000 device.
This patch adds a device quirk to handle this difference.
Link: https://lore.kernel.org/all/20220710115248.190280-4-biju.das.jz@bp.renesas.com
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
drivers/net/can/sja1000/sja1000.c | 8 +++++---
drivers/net/can/sja1000/sja1000.h | 3 ++-
2 files changed, 7 insertions(+), 4 deletions(-)
diff --git a/drivers/net/can/sja1000/sja1000.c b/drivers/net/can/sja1000/sja1000.c
index 2e7638f98cf1..d9da471f1bb9 100644
--- a/drivers/net/can/sja1000/sja1000.c
+++ b/drivers/net/can/sja1000/sja1000.c
@@ -183,8 +183,9 @@ static void chipset_init(struct net_device *dev)
{
struct sja1000_priv *priv = netdev_priv(dev);
- /* set clock divider and output control register */
- priv->write_reg(priv, SJA1000_CDR, priv->cdr | CDR_PELICAN);
+ if (!(priv->flags & SJA1000_QUIRK_NO_CDR_REG))
+ /* set clock divider and output control register */
+ priv->write_reg(priv, SJA1000_CDR, priv->cdr | CDR_PELICAN);
/* set acceptance filter (accept all) */
priv->write_reg(priv, SJA1000_ACCC0, 0x00);
@@ -209,7 +210,8 @@ static void sja1000_start(struct net_device *dev)
set_reset_mode(dev);
/* Initialize chip if uninitialized at this stage */
- if (!(priv->read_reg(priv, SJA1000_CDR) & CDR_PELICAN))
+ if (!(priv->flags & SJA1000_QUIRK_NO_CDR_REG ||
+ priv->read_reg(priv, SJA1000_CDR) & CDR_PELICAN))
chipset_init(dev);
/* Clear error counters and error code capture */
diff --git a/drivers/net/can/sja1000/sja1000.h b/drivers/net/can/sja1000/sja1000.h
index 9d46398f8154..7f736f1df547 100644
--- a/drivers/net/can/sja1000/sja1000.h
+++ b/drivers/net/can/sja1000/sja1000.h
@@ -145,7 +145,8 @@
/*
* Flags for sja1000priv.flags
*/
-#define SJA1000_CUSTOM_IRQ_HANDLER 0x1
+#define SJA1000_CUSTOM_IRQ_HANDLER BIT(0)
+#define SJA1000_QUIRK_NO_CDR_REG BIT(1)
/*
* SJA1000 private data structure
--
2.35.1
next prev parent reply other threads:[~2022-07-20 8:11 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-20 8:10 [PATCH net-next 0/29] pull-request: can-next 2022-07-20 Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 01/29] can: slcan: use scnprintf() as a hardening measure Marc Kleine-Budde
2022-07-20 9:30 ` patchwork-bot+netdevbpf
2022-07-20 8:10 ` [PATCH net-next 02/29] can: slcan: convert comments to network style comments Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 03/29] can: slcan: slcan_init() convert printk(LEVEL ...) to pr_level() Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 04/29] can: slcan: fix whitespace issues Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 05/29] can: slcan: convert comparison to NULL into !val Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 06/29] can: slcan: clean up if/else Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 07/29] dt-bindings: can: sja1000: Convert to json-schema Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 08/29] dt-bindings: can: nxp,sja1000: Document RZ/N1{D,S} support Marc Kleine-Budde
2022-07-20 8:10 ` Marc Kleine-Budde [this message]
2022-07-20 8:10 ` [PATCH net-next 10/29] can: sja1000: Use device_get_match_data to get device data Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 11/29] can: sja1000: Change the return type as void for SoC specific init Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 12/29] can: slcan: do not sleep with a spin lock held Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 13/29] can: c_can: remove wrong comment Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 14/29] can: ctucanfd: Update CTU CAN FD IP core registers to match version 3.x Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 15/29] can: peak_usb: pcan_dump_mem(): mark input prompt and data pointer as const Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 16/29] can: peak_usb: correction of an initially misnamed field name Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 17/29] can: peak_usb: include support for a new MCU Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 18/29] can: pch_can: do not report txerr and rxerr during bus-off Marc Kleine-Budde
2022-07-21 15:27 ` Nathan Chancellor
2022-07-21 15:47 ` Marc Kleine-Budde
2022-07-21 16:11 ` Vincent MAILHOL
2022-07-21 16:20 ` Nathan Chancellor
2022-07-21 16:51 ` Jakub Kicinski
2022-07-21 16:00 ` [PATCH] can: pch_can: initialize errc before using it Vincent Mailhol
2022-07-21 16:02 ` Nathan Chancellor
2022-07-20 8:10 ` [PATCH net-next 19/29] can: rcar_can: do not report txerr and rxerr during bus-off Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 20/29] can: sja1000: " Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 21/29] can: slcan: " Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 22/29] can: hi311x: " Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 23/29] can: sun4i_can: " Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 24/29] can: kvaser_usb_hydra: " Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 25/29] can: kvaser_usb_leaf: " Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 26/29] can: usb_8dev: " Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 27/29] can: error: specify the values of data[5..7] of CAN error frames Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 28/29] can: add CAN_ERR_CNT flag to notify availability of error counter Marc Kleine-Budde
2022-07-20 8:10 ` [PATCH net-next 29/29] can: error: add definitions for the different CAN error thresholds Marc Kleine-Budde
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