* [PATCH v2] arm64: dts: ti: k3-j784s4: Fix I2C pinmux pull configuration
@ 2025-10-22 12:11 Aniket Limaye
2025-10-22 12:29 ` Aniket Limaye
0 siblings, 1 reply; 2+ messages in thread
From: Aniket Limaye @ 2025-10-22 12:11 UTC (permalink / raw)
To: Nishanth Menon, Vignesh Raghavendra, Tero Kristo
Cc: Rob Herring, Krzysztof Kozlowski, Conor Dooley, linux-arm-kernel,
devicetree, linux-kernel, u-kumar1, gehariprasath, Aniket Limaye
The I2C pins for some of the instances on J784S4/J742S2/AM69 are
configured as PIN_INPUT_PULLUP while these pins are open-drain type and
do not support internal pull-ups [0][1][2]. The pullup configuration
bits in the corresponding padconfig registers are reserved and any
writes to them have no effect and readback checks on those bits fail.
Update the pinmux settings to use PIN_INPUT instead of PIN_INPUT_PULLUP
to reflect the correct hardware behaviour.
[0]: https://www.ti.com/lit/gpn/tda4ah-q1 (J784S4 Datasheet: Table 5-1. Pin Attributes)
[1]: https://www.ti.com/lit/gpn/tda4ape-q1 (J742S2 Datasheet: Table 5-1. Pin Attributes)
[2]: https://www.ti.com/lit/gpn/am69a (AM69 Datasheet: Table 5-1. Pin Attributes)
Fixes: e20a06aca5c9 ("arm64: dts: ti: Add support for J784S4 EVM board")
Fixes: 635fb18ba008 ("arch: arm64: dts: Add support for AM69 Starter Kit")
Fixes: 0ec1a48d99dd ("arm64: dts: ti: k3-am69-sk: Add pinmux for RPi Header")
Signed-off-by: Aniket Limaye <a-limaye@ti.com>
---
v2:
- Added Fixes tags
---
arch/arm64/boot/dts/ti/k3-am69-sk.dts | 8 ++++----
arch/arm64/boot/dts/ti/k3-j784s4-j742s2-evm-common.dtsi | 4 ++--
2 files changed, 6 insertions(+), 6 deletions(-)
diff --git a/arch/arm64/boot/dts/ti/k3-am69-sk.dts b/arch/arm64/boot/dts/ti/k3-am69-sk.dts
index 5896e57b5b9e..0e2d12cb051d 100644
--- a/arch/arm64/boot/dts/ti/k3-am69-sk.dts
+++ b/arch/arm64/boot/dts/ti/k3-am69-sk.dts
@@ -236,8 +236,8 @@ J784S4_IOPAD(0x0d4, PIN_OUTPUT, 11) /* (AN38) SPI0_CLK.UART8_TXD */
main_i2c0_pins_default: main-i2c0-default-pins {
pinctrl-single,pins = <
- J784S4_IOPAD(0x0e0, PIN_INPUT_PULLUP, 0) /* (AN36) I2C0_SCL */
- J784S4_IOPAD(0x0e4, PIN_INPUT_PULLUP, 0) /* (AP37) I2C0_SDA */
+ J784S4_IOPAD(0x0e0, PIN_INPUT, 0) /* (AN36) I2C0_SCL */
+ J784S4_IOPAD(0x0e4, PIN_INPUT, 0) /* (AP37) I2C0_SDA */
>;
};
@@ -416,8 +416,8 @@ J784S4_WKUP_IOPAD(0x088, PIN_OUTPUT, 0) /* (J37) WKUP_GPIO0_12.MCU_UART0_TXD */
mcu_i2c0_pins_default: mcu-i2c0-default-pins {
pinctrl-single,pins = <
- J784S4_WKUP_IOPAD(0x0a0, PIN_INPUT_PULLUP, 0) /* (M35) MCU_I2C0_SCL */
- J784S4_WKUP_IOPAD(0x0a4, PIN_INPUT_PULLUP, 0) /* (G34) MCU_I2C0_SDA */
+ J784S4_WKUP_IOPAD(0x0a0, PIN_INPUT, 0) /* (M35) MCU_I2C0_SCL */
+ J784S4_WKUP_IOPAD(0x0a4, PIN_INPUT, 0) /* (G34) MCU_I2C0_SDA */
>;
};
diff --git a/arch/arm64/boot/dts/ti/k3-j784s4-j742s2-evm-common.dtsi b/arch/arm64/boot/dts/ti/k3-j784s4-j742s2-evm-common.dtsi
index 419c1a70e028..2834f0a8bbee 100644
--- a/arch/arm64/boot/dts/ti/k3-j784s4-j742s2-evm-common.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-j784s4-j742s2-evm-common.dtsi
@@ -270,8 +270,8 @@ J784S4_IOPAD(0x0d4, PIN_OUTPUT, 11) /* (AN38) SPI0_CLK.UART8_TXD */
main_i2c0_pins_default: main-i2c0-default-pins {
pinctrl-single,pins = <
- J784S4_IOPAD(0x0e0, PIN_INPUT_PULLUP, 0) /* (AN36) I2C0_SCL */
- J784S4_IOPAD(0x0e4, PIN_INPUT_PULLUP, 0) /* (AP37) I2C0_SDA */
+ J784S4_IOPAD(0x0e0, PIN_INPUT, 0) /* (AN36) I2C0_SCL */
+ J784S4_IOPAD(0x0e4, PIN_INPUT, 0) /* (AP37) I2C0_SDA */
>;
};
--
2.51.0
^ permalink raw reply related [flat|nested] 2+ messages in thread* Re: [PATCH v2] arm64: dts: ti: k3-j784s4: Fix I2C pinmux pull configuration
2025-10-22 12:11 [PATCH v2] arm64: dts: ti: k3-j784s4: Fix I2C pinmux pull configuration Aniket Limaye
@ 2025-10-22 12:29 ` Aniket Limaye
0 siblings, 0 replies; 2+ messages in thread
From: Aniket Limaye @ 2025-10-22 12:29 UTC (permalink / raw)
To: Nishanth Menon, Vignesh Raghavendra, Tero Kristo
Cc: Rob Herring, Krzysztof Kozlowski, Conor Dooley, linux-arm-kernel,
devicetree, linux-kernel, u-kumar1, gehariprasath
On 22/10/25 17:41, Aniket Limaye wrote:
> The I2C pins for some of the instances on J784S4/J742S2/AM69 are
> configured as PIN_INPUT_PULLUP while these pins are open-drain type and
> do not support internal pull-ups [0][1][2]. The pullup configuration
> bits in the corresponding padconfig registers are reserved and any
> writes to them have no effect and readback checks on those bits fail.
>
> Update the pinmux settings to use PIN_INPUT instead of PIN_INPUT_PULLUP
> to reflect the correct hardware behaviour.
>
> [0]: https://www.ti.com/lit/gpn/tda4ah-q1 (J784S4 Datasheet: Table 5-1. Pin Attributes)
> [1]: https://www.ti.com/lit/gpn/tda4ape-q1 (J742S2 Datasheet: Table 5-1. Pin Attributes)
> [2]: https://www.ti.com/lit/gpn/am69a (AM69 Datasheet: Table 5-1. Pin Attributes)
>
> Fixes: e20a06aca5c9 ("arm64: dts: ti: Add support for J784S4 EVM board")
> Fixes: 635fb18ba008 ("arch: arm64: dts: Add support for AM69 Starter Kit")
> Fixes: 0ec1a48d99dd ("arm64: dts: ti: k3-am69-sk: Add pinmux for RPi Header")
> Signed-off-by: Aniket Limaye <a-limaye@ti.com>
Forgot to collect Udit's Reviewed-by
Resent a v3 at:
https://lore.kernel.org/lkml/20251022122638.234367-1-a-limaye@ti.com/
> ---
> v2:
> - Added Fixes tags
> ---
> arch/arm64/boot/dts/ti/k3-am69-sk.dts | 8 ++++----
> arch/arm64/boot/dts/ti/k3-j784s4-j742s2-evm-common.dtsi | 4 ++--
> 2 files changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/arch/arm64/boot/dts/ti/k3-am69-sk.dts b/arch/arm64/boot/dts/ti/k3-am69-sk.dts
> index 5896e57b5b9e..0e2d12cb051d 100644
> --- a/arch/arm64/boot/dts/ti/k3-am69-sk.dts
> +++ b/arch/arm64/boot/dts/ti/k3-am69-sk.dts
> @@ -236,8 +236,8 @@ J784S4_IOPAD(0x0d4, PIN_OUTPUT, 11) /* (AN38) SPI0_CLK.UART8_TXD */
>
> main_i2c0_pins_default: main-i2c0-default-pins {
> pinctrl-single,pins = <
> - J784S4_IOPAD(0x0e0, PIN_INPUT_PULLUP, 0) /* (AN36) I2C0_SCL */
> - J784S4_IOPAD(0x0e4, PIN_INPUT_PULLUP, 0) /* (AP37) I2C0_SDA */
> + J784S4_IOPAD(0x0e0, PIN_INPUT, 0) /* (AN36) I2C0_SCL */
> + J784S4_IOPAD(0x0e4, PIN_INPUT, 0) /* (AP37) I2C0_SDA */
> >;
> };
>
> @@ -416,8 +416,8 @@ J784S4_WKUP_IOPAD(0x088, PIN_OUTPUT, 0) /* (J37) WKUP_GPIO0_12.MCU_UART0_TXD */
>
> mcu_i2c0_pins_default: mcu-i2c0-default-pins {
> pinctrl-single,pins = <
> - J784S4_WKUP_IOPAD(0x0a0, PIN_INPUT_PULLUP, 0) /* (M35) MCU_I2C0_SCL */
> - J784S4_WKUP_IOPAD(0x0a4, PIN_INPUT_PULLUP, 0) /* (G34) MCU_I2C0_SDA */
> + J784S4_WKUP_IOPAD(0x0a0, PIN_INPUT, 0) /* (M35) MCU_I2C0_SCL */
> + J784S4_WKUP_IOPAD(0x0a4, PIN_INPUT, 0) /* (G34) MCU_I2C0_SDA */
> >;
> };
>
> diff --git a/arch/arm64/boot/dts/ti/k3-j784s4-j742s2-evm-common.dtsi b/arch/arm64/boot/dts/ti/k3-j784s4-j742s2-evm-common.dtsi
> index 419c1a70e028..2834f0a8bbee 100644
> --- a/arch/arm64/boot/dts/ti/k3-j784s4-j742s2-evm-common.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-j784s4-j742s2-evm-common.dtsi
> @@ -270,8 +270,8 @@ J784S4_IOPAD(0x0d4, PIN_OUTPUT, 11) /* (AN38) SPI0_CLK.UART8_TXD */
>
> main_i2c0_pins_default: main-i2c0-default-pins {
> pinctrl-single,pins = <
> - J784S4_IOPAD(0x0e0, PIN_INPUT_PULLUP, 0) /* (AN36) I2C0_SCL */
> - J784S4_IOPAD(0x0e4, PIN_INPUT_PULLUP, 0) /* (AP37) I2C0_SDA */
> + J784S4_IOPAD(0x0e0, PIN_INPUT, 0) /* (AN36) I2C0_SCL */
> + J784S4_IOPAD(0x0e4, PIN_INPUT, 0) /* (AP37) I2C0_SDA */
> >;
> };
>
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2025-10-22 12:11 [PATCH v2] arm64: dts: ti: k3-j784s4: Fix I2C pinmux pull configuration Aniket Limaye
2025-10-22 12:29 ` Aniket Limaye
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