[PATCH v1] can: mcp251xfd: use regmap_bulk_write for compatibility

[Su Yanjun]

Recently i use mcp2518fd on 4.x kernel which multiple write is not
backported, regmap_raw_write will cause old kernel crash because the
tx buffer in driver is smaller then 2K. Use regmap_bulk_write instead
for compatibility.

Signed-off-by: Su Yanjun <suyanjun...@gmail.com>
---
 drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c 
b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
index 3dde52669343..ab8aad0a7594 100644
--- a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
+++ b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
@@ -932,6 +932,7 @@ static int mcp251xfd_chip_ecc_init(struct mcp251xfd_priv 
*priv)
        void *ram;
        u32 val = 0;
        int err;
+       int val_bytes = regmap_get_val_bytes(priv->map_reg);
 
        ecc->ecc_stat = 0;
 
@@ -947,8 +948,8 @@ static int mcp251xfd_chip_ecc_init(struct mcp251xfd_priv 
*priv)
        if (!ram)
                return -ENOMEM;
 
-       err = regmap_raw_write(priv->map_reg, MCP251XFD_RAM_START, ram,
-                              MCP251XFD_RAM_SIZE);
+       err = regmap_bulk_write(priv->map_reg, MCP251XFD_RAM_START, ram,
+                              MCP251XFD_RAM_SIZE / val_bytes);
        kfree(ram);
 
        return err;
-- 
2.25.1