netdev - [PATCH net-next 36/36] can: mcp251xfd: mcp251xfd_priv: introduce macros specifying the number of supported TEF/RX/TX rings

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Date:   Wed, 23 Feb 2022 23:43:32 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, linux-can@...r.kernel.org,
        kernel@...gutronix.de, Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH net-next 36/36] can: mcp251xfd: mcp251xfd_priv: introduce macros specifying the number of supported TEF/RX/TX rings

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@...gutronix.de>
---
 drivers/net/can/spi/mcp251xfd/mcp251xfd.h | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/net/can/spi/mcp251xfd/mcp251xfd.h b/drivers/net/can/spi/mcp251xfd/mcp251xfd.h
index f359dd0aa458..87cc13d455c1 100644
--- 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@...gutronix.de>
  * Copyright (c) 2019 Martin Sperl <kernel@...tin.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;
 
-- 
2.34.1