can: mcp251xfd: replace sizeof(u32) with val_bytes in regmap

The sizeof(u32) is hardcoded. It's better to use the config value from the
regmap.

It increases the size of target object, but it's flexible when new mcp chip
need other val_bytes.

Link: https://lore.kernel.org/r/20210122081334.213957-1-suyanjun218@gmail.com
Signed-off-by: Su Yanjun <suyanjun218@gmail.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c

@@ -1308,6 +1308,7 @@ mcp251xfd_tef_obj_read(const struct mcp251xfd_priv *priv,
 		       const u8 offset, const u8 len)
 {
 	const struct mcp251xfd_tx_ring *tx_ring = priv->tx;
+	const int val_bytes = regmap_get_val_bytes(priv->map_rx);
 
 	if (IS_ENABLED(CONFIG_CAN_MCP251XFD_SANITY) &&
 	    (offset > tx_ring->obj_num ||
@@ -1322,7 +1323,7 @@ mcp251xfd_tef_obj_read(const struct mcp251xfd_priv *priv,
 	return regmap_bulk_read(priv->map_rx,
 				mcp251xfd_get_tef_obj_addr(offset),
 				hw_tef_obj,
-				sizeof(*hw_tef_obj) / sizeof(u32) * len);
+				sizeof(*hw_tef_obj) / val_bytes * len);
 }
 
 static int mcp251xfd_handle_tefif(struct mcp251xfd_priv *priv)
@@ -1510,12 +1511,13 @@ mcp251xfd_rx_obj_read(const struct mcp251xfd_priv *priv,
 		      struct mcp251xfd_hw_rx_obj_canfd *hw_rx_obj,
 		      const u8 offset, const u8 len)
 {
+	const int val_bytes = regmap_get_val_bytes(priv->map_rx);
 	int err;
 
 	err = regmap_bulk_read(priv->map_rx,
 			       mcp251xfd_get_rx_obj_addr(ring, offset),
 			       hw_rx_obj,
-			       len * ring->obj_size / sizeof(u32));
+			       len * ring->obj_size / val_bytes);
 
 	return err;
 }
@@ -2137,6 +2139,7 @@ static int mcp251xfd_handle_spicrcif(struct mcp251xfd_priv *priv)
 static irqreturn_t mcp251xfd_irq(int irq, void *dev_id)
 {
 	struct mcp251xfd_priv *priv = dev_id;
+	const int val_bytes = regmap_get_val_bytes(priv->map_reg);
 	irqreturn_t handled = IRQ_NONE;
 	int err;
 
@@ -2162,7 +2165,7 @@ static irqreturn_t mcp251xfd_irq(int irq, void *dev_id)
 		err = regmap_bulk_read(priv->map_reg, MCP251XFD_REG_INT,
 				       &priv->regs_status,
 				       sizeof(priv->regs_status) /
-				       sizeof(u32));
+				       val_bytes);
 		if (err)
 			goto out_fail;