* Re: [PATCH v2] arm64: dts: meson: switch TFLASH_VDD_EN pin to open drain on Odroid-C4
2021-01-22 5:52 ` [PATCH v2] arm64: dts: meson: switch TFLASH_VDD_EN pin to open drain on Odroid-C4 Marek Szyprowski
@ 2021-01-25 18:37 ` Neil Armstrong
2021-01-25 18:42 ` Kevin Hilman
1 sibling, 0 replies; 3+ messages in thread
From: Neil Armstrong @ 2021-01-25 18:37 UTC (permalink / raw)
To: Marek Szyprowski, linux-amlogic, linux-arm-kernel
Cc: Martin Blumenstingl, Kevin Hilman, Dongjin Kim,
Bartlomiej Zolnierkiewicz, Jerome Brunet
On 22/01/2021 06:52, Marek Szyprowski wrote:
> For the proper reboot Odroid-C4 board requires to switch TFLASH_VDD_EN
> pin to the high impedance mode, otherwise the board is stuck in the
> middle of loading early stages of the bootloader from SD card.
>
> This can be achieved by using the OPEN_DRAIN flag instead of the
> ACTIVE_HIGH, what will leave the pin in input mode to achieve high state
> (pin has the pull-up) and solve the issue.
>
> Suggested-by: Neil Armstrong <narmstrong@baylibre.com>
> Fixes: 326e57518b0d ("arm64: dts: meson-sm1: add support for Hardkernel ODROID-C4")
> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
> Acked-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
> ---
> Here is a discussion on u-boot's mailing list that inspired this patch:
> https://lists.denx.de/pipermail/u-boot/2020-December/435295.html
>
> Changelog:
> v2:
> - fixed typo in the commit message
>
> v1: https://lore.kernel.org/linux-amlogic/20201218102228.16211-1-m.szyprowski@samsung.com/
> - initial version
> ---
> arch/arm64/boot/dts/amlogic/meson-sm1-odroid-c4.dts | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm64/boot/dts/amlogic/meson-sm1-odroid-c4.dts b/arch/arm64/boot/dts/amlogic/meson-sm1-odroid-c4.dts
> index cf5a98f0e47c..a712273c905a 100644
> --- a/arch/arm64/boot/dts/amlogic/meson-sm1-odroid-c4.dts
> +++ b/arch/arm64/boot/dts/amlogic/meson-sm1-odroid-c4.dts
> @@ -52,7 +52,7 @@
> regulator-min-microvolt = <3300000>;
> regulator-max-microvolt = <3300000>;
>
> - gpio = <&gpio_ao GPIOAO_3 GPIO_ACTIVE_HIGH>;
> + gpio = <&gpio_ao GPIOAO_3 GPIO_OPEN_DRAIN>;
> enable-active-high;
> regulator-always-on;
> };
>
Hi Kevin,
The same fix was pushed on u-boot and solves the issue.
Could you take it for fixes ?
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Neil
_______________________________________________
linux-amlogic mailing list
linux-amlogic@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-amlogic
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [PATCH v2] arm64: dts: meson: switch TFLASH_VDD_EN pin to open drain on Odroid-C4
2021-01-22 5:52 ` [PATCH v2] arm64: dts: meson: switch TFLASH_VDD_EN pin to open drain on Odroid-C4 Marek Szyprowski
2021-01-25 18:37 ` Neil Armstrong
@ 2021-01-25 18:42 ` Kevin Hilman
1 sibling, 0 replies; 3+ messages in thread
From: Kevin Hilman @ 2021-01-25 18:42 UTC (permalink / raw)
To: Marek Szyprowski, linux-amlogic, linux-arm-kernel
Cc: Martin Blumenstingl, Dongjin Kim, Bartlomiej Zolnierkiewicz,
Jerome Brunet, Neil Armstrong
On Fri, 22 Jan 2021 06:52:18 +0100, Marek Szyprowski wrote:
> For the proper reboot Odroid-C4 board requires to switch TFLASH_VDD_EN
> pin to the high impedance mode, otherwise the board is stuck in the
> middle of loading early stages of the bootloader from SD card.
>
> This can be achieved by using the OPEN_DRAIN flag instead of the
> ACTIVE_HIGH, what will leave the pin in input mode to achieve high state
> (pin has the pull-up) and solve the issue.
Applied, thanks!
[1/1] arm64: dts: meson: switch TFLASH_VDD_EN pin to open drain on Odroid-C4
commit: c649d91a8ec4dda78bcbd3890156bffb4df2fa16
Best regards,
--
Kevin Hilman <khilman@baylibre.com>
_______________________________________________
linux-amlogic mailing list
linux-amlogic@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-amlogic
^ permalink raw reply [flat|nested] 3+ messages in thread