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ARM: dts: am43xx: fix SLEWCTRL_FAST pinctrl binding 

According to AM437x TRM, Document SPRUHL7B, Revised December 2014,
Section 7.2.1 Pad Control Registers, setting bit 19 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, mdio, and uart) are left unmodified as
SLEWCTRL_FAST was the macro used and actual desired state. Tested on
am437x-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>
hifive-unleashed-5.1
Dave Gerlach 2015-02-27 19:10:27 -06:00 committed by Tony Lindgren
parent 424e0f039b
commit 10b2185514
1 changed files with 2 additions and 1 deletions
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3
include/dt-bindings/pinctrl/am43xx.h
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@ -18,7 +18,8 @@
#define PULL_DISABLE (1 << 16)
#define PULL_UP (1 << 17)
#define INPUT_EN (1 << 18)
#define SLEWCTRL_FAST (1 << 19)
#define SLEWCTRL_SLOW (1 << 19)
#define SLEWCTRL_FAST 0
#define DS0_PULL_UP_DOWN_EN (1 << 27)
#define PIN_OUTPUT (PULL_DISABLE)