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pinctrl: dra: dt-bindings: Add virtual mode configuration option 

In addition to the regular mux configuration such as mux mode 1,
2 etc, certain pins of DRA7 require to have "virtual mode" also
programmed. This allows for predefined delay characteristics to
be used by the SoC to meet timing characterstics needed for the
interface.

Provide easy to use macro to do the same.

It is important to note that the official TI guidelines recommend
to do as minimal pin reconfiguration beyond the bootloader given
the design of the hardware involved which can result in substantial
glitches which may impair functionality of certain peripherals.

Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Nishanth Menon 2015-06-22 10:22:26 -05:00 committed by Tony Lindgren
parent ad548430ab
commit 601b29aa48
1 changed files with 20 additions and 0 deletions
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20
include/dt-bindings/pinctrl/dra.h
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@ -30,6 +30,26 @@
#define MUX_MODE14 0xe
#define MUX_MODE15 0xf
/* Certain pins need virtual mode, but note: they may glitch */
#define MUX_VIRTUAL_MODE0 (MODE_SELECT | (0x0 << 4))
#define MUX_VIRTUAL_MODE1 (MODE_SELECT | (0x1 << 4))
#define MUX_VIRTUAL_MODE2 (MODE_SELECT | (0x2 << 4))
#define MUX_VIRTUAL_MODE3 (MODE_SELECT | (0x3 << 4))
#define MUX_VIRTUAL_MODE4 (MODE_SELECT | (0x4 << 4))
#define MUX_VIRTUAL_MODE5 (MODE_SELECT | (0x5 << 4))
#define MUX_VIRTUAL_MODE6 (MODE_SELECT | (0x6 << 4))
#define MUX_VIRTUAL_MODE7 (MODE_SELECT | (0x7 << 4))
#define MUX_VIRTUAL_MODE8 (MODE_SELECT | (0x8 << 4))
#define MUX_VIRTUAL_MODE9 (MODE_SELECT | (0x9 << 4))
#define MUX_VIRTUAL_MODE10 (MODE_SELECT | (0xa << 4))
#define MUX_VIRTUAL_MODE11 (MODE_SELECT | (0xb << 4))
#define MUX_VIRTUAL_MODE12 (MODE_SELECT | (0xc << 4))
#define MUX_VIRTUAL_MODE13 (MODE_SELECT | (0xd << 4))
#define MUX_VIRTUAL_MODE14 (MODE_SELECT | (0xe << 4))
#define MUX_VIRTUAL_MODE15 (MODE_SELECT | (0xf << 4))
#define MODE_SELECT (1 << 8)
#define PULL_ENA (0 << 16)
#define PULL_DIS (1 << 16)
#define PULL_UP (1 << 17)