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 @@ -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>; }; }; --- a/arch/arm/boot/dts/at91sam9261.dtsi +++ b/arch/arm/boot/dts/at91sam9261.dtsi @@ -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>; };
--- 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>; };
--- a/arch/arm/boot/dts/at91sam9g45.dtsi +++ b/arch/arm/boot/dts/at91sam9g45.dtsi @@ -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>; };
--- 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>; };