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ARM: dts: dra7x-evm: avoid possible contention while muxing on CAN lines 

DCAN1 RX and TX lines are internally pulled high according to [1].
While muxing between DCAN mode and SAFE mode we make sure
that the same pull direction is set to minimize opposite
pull contention during the switching window.

[1] in DRA7 data manual, Ball characteristics table 4-2, DSIS colum shows
the state driven to the peripheral input while in the deselcted mode.
DSIS - De-Selected Input State.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Roger Quadros 2015-03-05 15:32:43 +02:00 committed by Tony Lindgren
parent 9b5580854f
commit d80d581bf3
2 changed files with 8 additions and 8 deletions
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8
arch/arm/boot/dts/dra7-evm.dts
View File

@ -263,15 +263,15 @@ davinci_mdio_sleep: davinci_mdio_sleep {
dcan1_pins_default: dcan1_pins_default {
pinctrl-single,pins = <
0x3d0 (PIN_OUTPUT | MUX_MODE0) /* dcan1_tx */
0x418 (PULL_DIS | MUX_MODE1) /* wakeup0.dcan1_rx */
0x3d0 (PIN_OUTPUT_PULLUP | MUX_MODE0) /* dcan1_tx */
0x418 (PULL_UP | MUX_MODE1) /* wakeup0.dcan1_rx */
>;
};
dcan1_pins_sleep: dcan1_pins_sleep {
pinctrl-single,pins = <
0x3d0 (MUX_MODE15) /* dcan1_tx.off */
0x418 (MUX_MODE15) /* wakeup0.off */
0x3d0 (MUX_MODE15 | PULL_UP) /* dcan1_tx.off */
0x418 (MUX_MODE15 | PULL_UP) /* wakeup0.off */
>;
};
};

8
arch/arm/boot/dts/dra72-evm.dts
View File

@ -119,15 +119,15 @@ mmc2_pins_default: mmc2_pins_default {
dcan1_pins_default: dcan1_pins_default {
pinctrl-single,pins = <
0x3d0 (PIN_OUTPUT | MUX_MODE0) /* dcan1_tx */
0x418 (PULL_DIS | MUX_MODE1) /* wakeup0.dcan1_rx */
0x3d0 (PIN_OUTPUT_PULLUP | MUX_MODE0) /* dcan1_tx */
0x418 (PULL_UP | MUX_MODE1) /* wakeup0.dcan1_rx */
>;
};
dcan1_pins_sleep: dcan1_pins_sleep {
pinctrl-single,pins = <
0x3d0 (MUX_MODE15) /* dcan1_tx.off */
0x418 (MUX_MODE15) /* wakeup0.off */
0x3d0 (MUX_MODE15 | PULL_UP) /* dcan1_tx.off */
0x418 (MUX_MODE15 | PULL_UP) /* wakeup0.off */
>;
};