imx: Add a common way for detecting NXP boards revision
NXP development boards based on i.MX6/i.MX7 contain the board
revision information stored in the fuses.
Introduce a common function that can be shared by different boards and
convert mx6sabreauto to use this new mechanism.
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
diff --git a/arch/arm/mach-imx/cpu.c b/arch/arm/mach-imx/cpu.c
index 18205dc..a32ab87 100644
--- a/arch/arm/mach-imx/cpu.c
+++ b/arch/arm/mach-imx/cpu.c
@@ -323,3 +323,28 @@
writel(reg, &iomuxc_regs->gpr[1]);
}
+
+#ifdef CONFIG_NXP_BOARD_REVISION
+int nxp_board_rev(void)
+{
+ /*
+ * Get Board ID information from OCOTP_GP1[15:8]
+ * RevA: 0x1
+ * RevB: 0x2
+ * RevC: 0x3
+ */
+ struct ocotp_regs *ocotp = (struct ocotp_regs *)OCOTP_BASE_ADDR;
+ struct fuse_bank *bank = &ocotp->bank[4];
+ struct fuse_bank4_regs *fuse =
+ (struct fuse_bank4_regs *)bank->fuse_regs;
+
+ return (readl(&fuse->gp1) >> 8 & 0x0F);
+}
+
+char nxp_board_rev_string(void)
+{
+ const char *rev = "A";
+
+ return (*rev + nxp_board_rev() - 1);
+}
+#endif