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authorFranklin S Cooper Jr <fcooper@ti.com>2018-01-10 13:55:18 +0300
committerMarc Kleine-Budde <mkl@pengutronix.de>2018-01-16 17:11:32 +0300
commit2290aefa2e90a43af8555ad6431d49de43259aa3 (patch)
tree9baabc23edea36d525a954f7763cd25dfb5a697d /include/linux/can
parent54a7fbcc17bc2881807ea8e65fa0857ec8a3a863 (diff)
downloadlinux-2290aefa2e90a43af8555ad6431d49de43259aa3.tar.xz
can: dev: Add support for limiting configured bitrate
Various CAN or CAN-FD IP may be able to run at a faster rate than what the transceiver the CAN node is connected to. This can lead to unexpected errors. However, CAN transceivers typically have fixed limitations and provide no means to discover these limitations at runtime. Therefore, add support for a can-transceiver node that can be reused by other CAN peripheral drivers to determine for both CAN and CAN-FD what the max bitrate that can be used. If the user tries to configure CAN to pass these maximum bitrates it will throw an error. Also add support for reading bitrate_max via the netlink interface. Reviewed-by: Suman Anna <s-anna@ti.com> Signed-off-by: Franklin S Cooper Jr <fcooper@ti.com> [nsekhar@ti.com: fix build error with !CONFIG_OF] Signed-off-by: Sekhar Nori <nsekhar@ti.com> Signed-off-by: Faiz Abbas <faiz_abbas@ti.com> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to 'include/linux/can')
-rw-r--r--include/linux/can/dev.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/can/dev.h b/include/linux/can/dev.h
index 61f1cf2d9f44..055aaf5ed9af 100644
--- a/include/linux/can/dev.h
+++ b/include/linux/can/dev.h
@@ -46,6 +46,7 @@ struct can_priv {
unsigned int bitrate_const_cnt;
const u32 *data_bitrate_const;
unsigned int data_bitrate_const_cnt;
+ u32 bitrate_max;
struct can_clock clock;
enum can_state state;
@@ -166,6 +167,12 @@ void can_put_echo_skb(struct sk_buff *skb, struct net_device *dev,
unsigned int can_get_echo_skb(struct net_device *dev, unsigned int idx);
void can_free_echo_skb(struct net_device *dev, unsigned int idx);
+#ifdef CONFIG_OF
+void of_can_transceiver(struct net_device *dev);
+#else
+static inline void of_can_transceiver(struct net_device *dev) { }
+#endif
+
struct sk_buff *alloc_can_skb(struct net_device *dev, struct can_frame **cf);
struct sk_buff *alloc_canfd_skb(struct net_device *dev,
struct canfd_frame **cfd);