* [PATCH] ARM: dts: colibri-imx6ull: Change drive strength for usdhc2
@ 2021-03-04 9:31 Philippe Schenker
2021-03-04 11:24 ` Fabio Estevam
2021-03-08 1:30 ` Shawn Guo
0 siblings, 2 replies; 3+ messages in thread
From: Philippe Schenker @ 2021-03-04 9:31 UTC (permalink / raw)
To: devicetree
Cc: Philippe Schenker, Fabio Estevam, NXP Linux Team,
Pengutronix Kernel Team, Rob Herring, Sascha Hauer, Shawn Guo,
linux-arm-kernel, linux-kernel
The current setting reflects about 86 Ohms of source-impedance
on the SDIO signals where the WiFi board is hooked up. PCB traces are
routed with 50 Ohms impedance and there are no serial resistors on
those traces.
This commit changes the source-impedance to 52 Ohms to better match our
hardware design.
The impedances given in this commit message refer to 3.3V operation.
Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>
---
arch/arm/boot/dts/imx6ull-colibri.dtsi | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/arch/arm/boot/dts/imx6ull-colibri.dtsi b/arch/arm/boot/dts/imx6ull-colibri.dtsi
index 4436556624d6..0cdbf7b6e728 100644
--- a/arch/arm/boot/dts/imx6ull-colibri.dtsi
+++ b/arch/arm/boot/dts/imx6ull-colibri.dtsi
@@ -522,12 +522,12 @@ MX6UL_PAD_SD1_DATA3__USDHC1_DATA3 0x170b9
pinctrl_usdhc2: usdhc2-grp {
fsl,pins = <
- MX6UL_PAD_CSI_DATA00__USDHC2_DATA0 0x17059
- MX6UL_PAD_CSI_DATA01__USDHC2_DATA1 0x17059
- MX6UL_PAD_CSI_DATA02__USDHC2_DATA2 0x17059
- MX6UL_PAD_CSI_DATA03__USDHC2_DATA3 0x17059
- MX6UL_PAD_CSI_HSYNC__USDHC2_CMD 0x17059
- MX6UL_PAD_CSI_VSYNC__USDHC2_CLK 0x17059
+ MX6UL_PAD_CSI_DATA00__USDHC2_DATA0 0x17069
+ MX6UL_PAD_CSI_DATA01__USDHC2_DATA1 0x17069
+ MX6UL_PAD_CSI_DATA02__USDHC2_DATA2 0x17069
+ MX6UL_PAD_CSI_DATA03__USDHC2_DATA3 0x17069
+ MX6UL_PAD_CSI_HSYNC__USDHC2_CMD 0x17069
+ MX6UL_PAD_CSI_VSYNC__USDHC2_CLK 0x17069
MX6UL_PAD_GPIO1_IO03__OSC32K_32K_OUT 0x10
>;
--
2.30.1
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* Re: [PATCH] ARM: dts: colibri-imx6ull: Change drive strength for usdhc2
2021-03-04 9:31 [PATCH] ARM: dts: colibri-imx6ull: Change drive strength for usdhc2 Philippe Schenker
@ 2021-03-04 11:24 ` Fabio Estevam
2021-03-08 1:30 ` Shawn Guo
1 sibling, 0 replies; 3+ messages in thread
From: Fabio Estevam @ 2021-03-04 11:24 UTC (permalink / raw)
To: Philippe Schenker
Cc: open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS,
NXP Linux Team, Pengutronix Kernel Team, Rob Herring,
Sascha Hauer, Shawn Guo,
moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE,
linux-kernel
Hi Philippe,
On Thu, Mar 4, 2021 at 6:31 AM Philippe Schenker
<philippe.schenker@toradex.com> wrote:
>
> The current setting reflects about 86 Ohms of source-impedance
> on the SDIO signals where the WiFi board is hooked up. PCB traces are
> routed with 50 Ohms impedance and there are no serial resistors on
> those traces.
>
> This commit changes the source-impedance to 52 Ohms to better match our
> hardware design.
>
> The impedances given in this commit message refer to 3.3V operation.
>
> Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
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linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] ARM: dts: colibri-imx6ull: Change drive strength for usdhc2
2021-03-04 9:31 [PATCH] ARM: dts: colibri-imx6ull: Change drive strength for usdhc2 Philippe Schenker
2021-03-04 11:24 ` Fabio Estevam
@ 2021-03-08 1:30 ` Shawn Guo
1 sibling, 0 replies; 3+ messages in thread
From: Shawn Guo @ 2021-03-08 1:30 UTC (permalink / raw)
To: Philippe Schenker
Cc: devicetree, Fabio Estevam, NXP Linux Team,
Pengutronix Kernel Team, Rob Herring, Sascha Hauer,
linux-arm-kernel, linux-kernel
On Thu, Mar 04, 2021 at 10:31:39AM +0100, Philippe Schenker wrote:
> The current setting reflects about 86 Ohms of source-impedance
> on the SDIO signals where the WiFi board is hooked up. PCB traces are
> routed with 50 Ohms impedance and there are no serial resistors on
> those traces.
>
> This commit changes the source-impedance to 52 Ohms to better match our
> hardware design.
>
> The impedances given in this commit message refer to 3.3V operation.
>
> Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>
Applied, thanks.
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linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 3+ messages in thread
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2021-03-04 9:31 [PATCH] ARM: dts: colibri-imx6ull: Change drive strength for usdhc2 Philippe Schenker
2021-03-04 11:24 ` Fabio Estevam
2021-03-08 1:30 ` Shawn Guo
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