can: mcp251xfd: mcp251xfd_priv: introduce macros specifying the number of supported...

This patch introduces macros to define the number of supported TEF, RX
and TX rings. As well as some assertions as sanity checks.

Link: https://lore.kernel.org/all/20220217103826.2299157-9-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/drivers/net/can/spi/mcp251xfd/mcp251xfd.h b/drivers/net/can/spi/mcp251xfd/mcp251xfd.h
index f359dd0aa45867d0b0812903fb8594bcbce099bf..87cc13d455c1f05a5f8e0e0143861752dd29726a 100644 (file)
--- a/drivers/net/can/spi/mcp251xfd/mcp251xfd.h
+++ b/drivers/net/can/spi/mcp251xfd/mcp251xfd.h
@@ -2,7 +2,7 @@
  *
  * mcp251xfd - Microchip MCP251xFD Family CAN controller driver
  *
- * Copyright (c) 2019, 2020 Pengutronix,
+ * Copyright (c) 2019, 2020, 2021 Pengutronix,
  *               Marc Kleine-Budde <kernel@pengutronix.de>
  * Copyright (c) 2019 Martin Sperl <kernel@martin.sperl.org>
  */
@@ -410,6 +410,15 @@ static_assert(MCP251XFD_TIMESTAMP_WORK_DELAY_SEC <
 #define MCP251XFD_SANITIZE_SPI 1
 #define MCP251XFD_SANITIZE_CAN 1
 
+/* FIFO and Ring */
+#define MCP251XFD_FIFO_TEF_NUM 1U
+#define MCP251XFD_FIFO_RX_NUM_MAX 1U
+#define MCP251XFD_FIFO_TX_NUM 1U
+
+static_assert(MCP251XFD_FIFO_TEF_NUM == 1U);
+static_assert(MCP251XFD_FIFO_TEF_NUM == MCP251XFD_FIFO_TX_NUM);
+static_assert(MCP251XFD_FIFO_RX_NUM_MAX <= 4U);
+
 /* Silence TX MAB overflow warnings */
 #define MCP251XFD_QUIRK_MAB_NO_WARN BIT(0)
 /* Use CRC to access registers */
@@ -596,9 +605,9 @@ struct mcp251xfd_priv {
        u32 spi_max_speed_hz_fast;
        u32 spi_max_speed_hz_slow;
 
-       struct mcp251xfd_tef_ring tef[1];
-       struct mcp251xfd_rx_ring *rx[1];
-       struct mcp251xfd_tx_ring tx[1];
+       struct mcp251xfd_tef_ring tef[MCP251XFD_FIFO_TEF_NUM];
+       struct mcp251xfd_rx_ring *rx[MCP251XFD_FIFO_RX_NUM_MAX];
+       struct mcp251xfd_tx_ring tx[MCP251XFD_FIFO_TX_NUM];
 
        u8 rx_ring_num;