diff options
| author | Ingo van Lil <inguin@gmx.de> | 2019-12-03 17:21:47 +0300 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2019-12-10 13:57:08 +0300 |
| commit | 9d39d86cd4af2b17b970d63307daad71f563d207 (patch) | |
| tree | a129c52192da0c63a71c7a140a174c45da719e8f /arch/arm/boot/dts/at91sam9263.dtsi | |
| parent | bbd73c02e7d19e7227d4780f9597f95ffb84bb68 (diff) | |
| download | linux-9d39d86cd4af2b17b970d63307daad71f563d207.tar.xz | |
ARM: dts: at91: Reenable UART TX pull-ups
Pull-ups for SAM9 UART/USART TX lines were disabled in a previous
commit. However, several chips in the SAM9 family require pull-ups to
prevent the TX lines from falling (and causing an endless break
condition) when the transceiver is disabled.
From the SAM9G20 datasheet, 32.5.1: "To prevent the TXD line from
falling when the USART is disabled, the use of an internal pull up
is mandatory.". This commit reenables the pull-ups for all chips having
that sentence in their datasheets.
Fixes: 5e04822f7db5 ("ARM: dts: at91: fixes uart pinctrl, set pullup on rx, clear pullup on tx")
Signed-off-by: Ingo van Lil <inguin@gmx.de>
Cc: Peter Rosin <peda@axentia.se>
Link: https://lore.kernel.org/r/20191203142147.875227-1-inguin@gmx.de
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Diffstat (limited to 'arch/arm/boot/dts/at91sam9263.dtsi')
| -rw-r--r-- | arch/arm/boot/dts/at91sam9263.dtsi | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/arm/boot/dts/at91sam9263.dtsi b/arch/arm/boot/dts/at91sam9263.dtsi index 99678abdda93..5c990cfae254 100644 --- a/arch/arm/boot/dts/at91sam9263.dtsi +++ b/arch/arm/boot/dts/at91sam9263.dtsi @@ -183,7 +183,7 @@ usart0 { pinctrl_usart0: usart0-0 { atmel,pins = - <AT91_PIOA 26 AT91_PERIPH_A AT91_PINCTRL_NONE + <AT91_PIOA 26 AT91_PERIPH_A AT91_PINCTRL_PULL_UP AT91_PIOA 27 AT91_PERIPH_A AT91_PINCTRL_PULL_UP>; }; @@ -201,7 +201,7 @@ usart1 { pinctrl_usart1: usart1-0 { atmel,pins = - <AT91_PIOD 0 AT91_PERIPH_A AT91_PINCTRL_NONE + <AT91_PIOD 0 AT91_PERIPH_A AT91_PINCTRL_PULL_UP AT91_PIOD 1 AT91_PERIPH_A AT91_PINCTRL_PULL_UP>; }; @@ -219,7 +219,7 @@ usart2 { pinctrl_usart2: usart2-0 { atmel,pins = - <AT91_PIOD 2 AT91_PERIPH_A AT91_PINCTRL_NONE + <AT91_PIOD 2 AT91_PERIPH_A AT91_PINCTRL_PULL_UP AT91_PIOD 3 AT91_PERIPH_A AT91_PINCTRL_PULL_UP>; }; |