Julia Lawall wrote a script
Link: http://lkml.kernel.org/r/alpine.DEB.2.10.1609201503260.2914@hadrien
that found a possible issue with macro argument precedence.
diff -u -p a/arch/arm/mach-imx/iomux-mx3.h b/arch/arm/mach-imx/iomux-mx3.h
--- a/arch/arm/mach-imx/iomux-mx3.h
+++ b/arch/arm/mach-imx/iomux-mx3.h
@@ -529,7 +529,7 @@ enum iomux_pins {
#define MX31_PIN_DCD_DTE1__DCD_DTE2 IOMUX_MODE(MX31_PIN_DCD_DTE1,
IOMUX_CONFIG_ALT1)
#define MX31_PIN_RI_DTE1__RI_DTE2 IOMUX_MODE(MX31_PIN_RI_DTE1,
IOMUX_CONFIG_ALT1)
#define MX31_PIN_DSR_DTE1__DSR_DTE2 IOMUX_MODE(MX31_PIN_DSR_DTE1,
IOMUX_CONFIG_ALT1)
-#define MX31_PIN_DTR_DTE1__DTR_DTE2 IOMUX_MODE(MX31_PIN_DTR_DTE1,
IOMUX_OCONFIG_ALT3 | IOMUX_ICONFIG_NONE)
+#define MX31_PIN_DTR_DTE1__DTR_DTE2 IOMUX_MODE(MX31_PIN_DTR_DTE1,
(IOMUX_OCONFIG_ALT3 | IOMUX_ICONFIG_NONE))
#define MX31_PIN_PC_RST__CTS5 IOMUX_MODE(MX31_PIN_PC_RST,
IOMUX_CONFIG_ALT2)
#define MX31_PIN_PC_VS2__RTS5 IOMUX_MODE(MX31_PIN_PC_VS2,
IOMUX_CONFIG_ALT2)
#define MX31_PIN_PC_BVD2__TXD5 IOMUX_MODE(MX31_PIN_PC_BVD2,
IOMUX_CONFIG_ALT2)
this may be intentional, but perhaps a solution
would be to use parentheses in the #define IOMUX_MODE
---
diff --git a/arch/arm/mach-imx/iomux-mx3.h b/arch/arm/mach-imx/iomux-mx3.h
index 368667b..3f9ede2 100644
--- a/arch/arm/mach-imx/iomux-mx3.h
+++ b/arch/arm/mach-imx/iomux-mx3.h
@@ -156,7 +156,7 @@ void mxc_iomux_mode(unsigned int pin_mode);
(((gpionum << IOMUX_GPIONUM_SHIFT) & IOMUX_GPIONUM_MASK) | \
(padnum & IOMUX_PADNUM_MASK))
-#define IOMUX_MODE(pin, mode) (pin | mode << IOMUX_MODE_SHIFT)
+#define IOMUX_MODE(pin, mode) ((pin) | ((mode) << IOMUX_MODE_SHIFT))
#define IOMUX_TO_GPIO(iomux_pin) \
((iomux_pin & IOMUX_GPIONUM_MASK) >> IOMUX_GPIONUM_SHIFT)
