From: Ingo van Lil inguin@gmx.de
commit 9d39d86cd4af2b17b970d63307daad71f563d207 upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/arm/boot/dts/at91sam9260.dtsi | 12 ++++++------ arch/arm/boot/dts/at91sam9261.dtsi | 6 +++--- arch/arm/boot/dts/at91sam9263.dtsi | 6 +++--- arch/arm/boot/dts/at91sam9g45.dtsi | 8 ++++---- arch/arm/boot/dts/at91sam9rl.dtsi | 8 ++++---- 5 files changed, 20 insertions(+), 20 deletions(-)
--- a/arch/arm/boot/dts/at91sam9260.dtsi +++ b/arch/arm/boot/dts/at91sam9260.dtsi @@ -434,7 +434,7 @@ 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>; };
@@ -468,7 +468,7 @@ 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>; };
@@ -486,7 +486,7 @@ 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>; };
@@ -504,7 +504,7 @@ 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>; };
@@ -522,7 +522,7 @@ 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>; }; }; @@ -530,7 +530,7 @@ 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>; }; }; --- a/arch/arm/boot/dts/at91sam9261.dtsi +++ b/arch/arm/boot/dts/at91sam9261.dtsi @@ -328,7 +328,7 @@ 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>; };
@@ -346,7 +346,7 @@ 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>; };
@@ -364,7 +364,7 @@ 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>; };
--- a/arch/arm/boot/dts/at91sam9263.dtsi +++ b/arch/arm/boot/dts/at91sam9263.dtsi @@ -437,7 +437,7 @@ 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>; };
@@ -455,7 +455,7 @@ 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>; };
@@ -473,7 +473,7 @@ 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>; };
--- a/arch/arm/boot/dts/at91sam9g45.dtsi +++ b/arch/arm/boot/dts/at91sam9g45.dtsi @@ -555,7 +555,7 @@ 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>; };
@@ -573,7 +573,7 @@ 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>; };
@@ -591,7 +591,7 @@ 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>; };
@@ -609,7 +609,7 @@ 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>; };
--- a/arch/arm/boot/dts/at91sam9rl.dtsi +++ b/arch/arm/boot/dts/at91sam9rl.dtsi @@ -681,7 +681,7 @@ 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>; };
@@ -720,7 +720,7 @@ 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>; };
@@ -743,7 +743,7 @@ 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>; };
@@ -766,7 +766,7 @@ 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>; };