diff options
| author | Ingo van Lil <inguin@gmx.de> | 2019-12-03 15:21:47 +0100 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2019-12-10 11:57:08 +0100 |
| commit | 9d39d86cd4af2b17b970d63307daad71f563d207 (patch) | |
| tree | a129c52192da0c63a71c7a140a174c45da719e8f /arch/arm/boot/dts/at91sam9rl.dtsi | |
| parent | ARM: dts: at91: sama5d2: set the sdmmc gclk frequency (diff) | |
| download | linux-9d39d86cd4af2b17b970d63307daad71f563d207.tar.xz linux-9d39d86cd4af2b17b970d63307daad71f563d207.zip | |
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/at91sam9rl.dtsi')
| -rw-r--r-- | arch/arm/boot/dts/at91sam9rl.dtsi | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/arm/boot/dts/at91sam9rl.dtsi b/arch/arm/boot/dts/at91sam9rl.dtsi index 8643b7151565..ea024e4b6e09 100644 --- a/arch/arm/boot/dts/at91sam9rl.dtsi +++ b/arch/arm/boot/dts/at91sam9rl.dtsi @@ -682,7 +682,7 @@ usart0 { pinctrl_usart0: usart0-0 { atmel,pins = - <AT91_PIOA 6 AT91_PERIPH_A AT91_PINCTRL_NONE>, + <AT91_PIOA 6 AT91_PERIPH_A AT91_PINCTRL_PULL_UP>, <AT91_PIOA 7 AT91_PERIPH_A AT91_PINCTRL_PULL_UP>; }; @@ -721,7 +721,7 @@ usart1 { pinctrl_usart1: usart1-0 { atmel,pins = - <AT91_PIOA 11 AT91_PERIPH_A AT91_PINCTRL_NONE>, + <AT91_PIOA 11 AT91_PERIPH_A AT91_PINCTRL_PULL_UP>, <AT91_PIOA 12 AT91_PERIPH_A AT91_PINCTRL_PULL_UP>; }; @@ -744,7 +744,7 @@ usart2 { pinctrl_usart2: usart2-0 { atmel,pins = - <AT91_PIOA 13 AT91_PERIPH_A AT91_PINCTRL_NONE>, + <AT91_PIOA 13 AT91_PERIPH_A AT91_PINCTRL_PULL_UP>, <AT91_PIOA 14 AT91_PERIPH_A AT91_PINCTRL_PULL_UP>; }; @@ -767,7 +767,7 @@ usart3 { pinctrl_usart3: usart3-0 { atmel,pins = - <AT91_PIOB 0 AT91_PERIPH_A AT91_PINCTRL_NONE>, + <AT91_PIOB 0 AT91_PERIPH_A AT91_PINCTRL_PULL_UP>, <AT91_PIOB 1 AT91_PERIPH_A AT91_PINCTRL_PULL_UP>; }; |