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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: 5e04822f7d ("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>
alistair/sensors
Ingo van Lil 2019-12-03 15:21:47 +01:00 committed by Alexandre Belloni
parent bbd73c02e7
commit 9d39d86cd4
5 changed files with 20 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
arch/arm/boot/dts/at91sam9260.dtsi
View File

@ -187,7 +187,7 @@
usart0 {
pinctrl_usart0: usart0-0 {
atmel,pins =
<AT91_PIOB 4 AT91_PERIPH_A AT91_PINCTRL_NONE
<AT91_PIOB 4 AT91_PERIPH_A AT91_PINCTRL_PULL_UP
AT91_PIOB 5 AT91_PERIPH_A AT91_PINCTRL_PULL_UP>;
};
@ -221,7 +221,7 @@
usart1 {
pinctrl_usart1: usart1-0 {
atmel,pins =
<AT91_PIOB 6 AT91_PERIPH_A AT91_PINCTRL_NONE
<AT91_PIOB 6 AT91_PERIPH_A AT91_PINCTRL_PULL_UP
AT91_PIOB 7 AT91_PERIPH_A AT91_PINCTRL_PULL_UP>;
};
@ -239,7 +239,7 @@
usart2 {
pinctrl_usart2: usart2-0 {
atmel,pins =
<AT91_PIOB 8 AT91_PERIPH_A AT91_PINCTRL_NONE
<AT91_PIOB 8 AT91_PERIPH_A AT91_PINCTRL_PULL_UP
AT91_PIOB 9 AT91_PERIPH_A AT91_PINCTRL_PULL_UP>;
};
@ -257,7 +257,7 @@
usart3 {
pinctrl_usart3: usart3-0 {
atmel,pins =
<AT91_PIOB 10 AT91_PERIPH_A AT91_PINCTRL_NONE
<AT91_PIOB 10 AT91_PERIPH_A AT91_PINCTRL_PULL_UP
AT91_PIOB 11 AT91_PERIPH_A AT91_PINCTRL_PULL_UP>;
};
@ -275,7 +275,7 @@
uart0 {
pinctrl_uart0: uart0-0 {
atmel,pins =
<AT91_PIOA 31 AT91_PERIPH_B AT91_PINCTRL_NONE
<AT91_PIOA 31 AT91_PERIPH_B AT91_PINCTRL_PULL_UP
AT91_PIOA 30 AT91_PERIPH_B AT91_PINCTRL_PULL_UP>;
};
};
@ -283,7 +283,7 @@
uart1 {
pinctrl_uart1: uart1-0 {
atmel,pins =
<AT91_PIOB 12 AT91_PERIPH_A AT91_PINCTRL_NONE
<AT91_PIOB 12 AT91_PERIPH_A AT91_PINCTRL_PULL_UP
AT91_PIOB 13 AT91_PERIPH_A AT91_PINCTRL_PULL_UP>;
};
};

6
arch/arm/boot/dts/at91sam9261.dtsi
View File

@ -329,7 +329,7 @@
usart0 {
pinctrl_usart0: usart0-0 {
atmel,pins =
<AT91_PIOC 8 AT91_PERIPH_A AT91_PINCTRL_NONE>,
<AT91_PIOC 8 AT91_PERIPH_A AT91_PINCTRL_PULL_UP>,
<AT91_PIOC 9 AT91_PERIPH_A AT91_PINCTRL_PULL_UP>;
};
@ -347,7 +347,7 @@
usart1 {
pinctrl_usart1: usart1-0 {
atmel,pins =
<AT91_PIOC 12 AT91_PERIPH_A AT91_PINCTRL_NONE>,
<AT91_PIOC 12 AT91_PERIPH_A AT91_PINCTRL_PULL_UP>,
<AT91_PIOC 13 AT91_PERIPH_A AT91_PINCTRL_PULL_UP>;
};
@ -365,7 +365,7 @@
usart2 {
pinctrl_usart2: usart2-0 {
atmel,pins =
<AT91_PIOC 14 AT91_PERIPH_A AT91_PINCTRL_NONE>,
<AT91_PIOC 14 AT91_PERIPH_A AT91_PINCTRL_PULL_UP>,
<AT91_PIOC 15 AT91_PERIPH_A AT91_PINCTRL_PULL_UP>;
};

6
arch/arm/boot/dts/at91sam9263.dtsi
View File

@ -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>;
};

8
arch/arm/boot/dts/at91sam9g45.dtsi
View File

@ -556,7 +556,7 @@
usart0 {
pinctrl_usart0: usart0-0 {
atmel,pins =
<AT91_PIOB 19 AT91_PERIPH_A AT91_PINCTRL_NONE
<AT91_PIOB 19 AT91_PERIPH_A AT91_PINCTRL_PULL_UP
AT91_PIOB 18 AT91_PERIPH_A AT91_PINCTRL_PULL_UP>;
};
@ -574,7 +574,7 @@
usart1 {
pinctrl_usart1: usart1-0 {
atmel,pins =
<AT91_PIOB 4 AT91_PERIPH_A AT91_PINCTRL_NONE
<AT91_PIOB 4 AT91_PERIPH_A AT91_PINCTRL_PULL_UP
AT91_PIOB 5 AT91_PERIPH_A AT91_PINCTRL_PULL_UP>;
};
@ -592,7 +592,7 @@
usart2 {
pinctrl_usart2: usart2-0 {
atmel,pins =
<AT91_PIOB 6 AT91_PERIPH_A AT91_PINCTRL_NONE
<AT91_PIOB 6 AT91_PERIPH_A AT91_PINCTRL_PULL_UP
AT91_PIOB 7 AT91_PERIPH_A AT91_PINCTRL_PULL_UP>;
};
@ -610,7 +610,7 @@
usart3 {
pinctrl_usart3: usart3-0 {
atmel,pins =
<AT91_PIOB 8 AT91_PERIPH_A AT91_PINCTRL_NONE
<AT91_PIOB 8 AT91_PERIPH_A AT91_PINCTRL_PULL_UP
AT91_PIOB 9 AT91_PERIPH_A AT91_PINCTRL_PULL_UP>;
};

8
arch/arm/boot/dts/at91sam9rl.dtsi
View File

@ -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>;
};