ARM: imx: imx7ulp: Add a comment explaining the B2 silicon version

To help the users to understand the meaning of bits 31-28 of the
JTAG_ID_REG register, add a comment explaining the value that is
expected from a i.MX7ULP rev B2.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

diff --git a/arch/arm/mach-imx/mach-imx7ulp.c b/arch/arm/mach-imx/mach-imx7ulp.c
index f6032ea7de8babf143d1c5e2c6201cb42f230fc6..a3c8dadec1c5a28a102f7fd0dc81d5515a20a858 100644 (file)
--- a/arch/arm/mach-imx/mach-imx7ulp.c
+++ b/arch/arm/mach-imx/mach-imx7ulp.c
@@ -37,6 +37,7 @@ static void __init imx7ulp_set_revision(void)
         * bit[31:28] of JTAG_ID register defines revision as below from B0:
         * 0001        B0
         * 0010        B1
+        * 0011        B2
         */
        switch (revision >> 28) {
        case 1: