From: Christian Amann Christian.Amann@de.bosch.com
Copy missing Kernel patch to make SLEWCTRL_SLOW available in device tree and to correct the value of SLEWCTRL_FAST. After this patch, the Kernel and U-boot device tree settings for SLEWCTRL have the same effect.
Original Kernel patch message: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
" According to AM335x TRM, Document spruh73l, Revised February 2015, Section 9.2.2 Pad Control Registers, setting bit 6 of the pad control registers actually sets the SLEWCTRL value to slow rather than fast as the current macro indicates. Introduce a new macro, SLEWCTRL_SLOW, that sets the bit, and modify SLEWCTRL_FAST to 0 but keep it for completeness. Current users of the macro (i2c and mdio) are left unmodified as SLEWCTRL_FAST was the macro used and actual desired state. Tested on am335x-gp-evm with no difference in software performance seen. Signed-off-by: Dave Gerlach d-gerlach@ti.com Signed-off-by: Tony Lindgren tony@atomide.com "
Signed-off-by: Christian Amann Christian.Amann@de.bosch.com --- include/dt-bindings/pinctrl/am33xx.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/include/dt-bindings/pinctrl/am33xx.h b/include/dt-bindings/pinctrl/am33xx.h index 2fbc804..226f772 100644 --- a/include/dt-bindings/pinctrl/am33xx.h +++ b/include/dt-bindings/pinctrl/am33xx.h @@ -13,7 +13,8 @@
#define PULL_DISABLE (1 << 3) #define INPUT_EN (1 << 5) -#define SLEWCTRL_FAST (1 << 6) +#define SLEWCTRL_SLOW (1 << 6) +#define SLEWCTRL_FAST 0
/* update macro depending on INPUT_EN and PULL_ENA */ #undef PIN_OUTPUT