clk: rs9: Limit check to vendor ID in VID register

Extract only vendor ID from VID register, the top 4 bits are
revision ID which are not useful for the vendor ID check.

Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Link: https://lore.kernel.org/r/20231113221949.111964-2-marek.vasut+renesas@mailbox.org
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Author: Marek Vasut

drivers/clk/clk-renesas-pcie.c

@@ -42,6 +42,7 @@
 #define RS9_REG_DID				0x6
 #define RS9_REG_BCP				0x7
 
+#define RS9_REG_VID_MASK			GENMASK(3, 0)
 #define RS9_REG_VID_IDT				0x01
 
 #define RS9_REG_DID_TYPE_FGV			(0x0 << RS9_REG_DID_TYPE_SHIFT)
@@ -333,6 +334,7 @@ static int rs9_probe(struct i2c_client *client)
 	if (ret < 0)
 		return ret;
 
+	vid &= RS9_REG_VID_MASK;
 	if (vid != RS9_REG_VID_IDT || did != rs9->chip_info->did)
 		return dev_err_probe(&client->dev, -ENODEV,
 				     "Incorrect VID/DID: %#02x, %#02x. Expected %#02x, %#02x\n",