I need FAN_TACH and SD card detect, I don’t know to implement two function in the pin GPIO08,Can I change one GPIO or combine the schematic
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You need to change one of the GPIO to another and also modify the device tree and pinmux.
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Which GPIO are you suggesting?
change which one FAN_TACH or SD card detect to GPIO
There is no limitation. You could change the cd_gpio (sdcard) to other gpios that are not in use.
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Hi 295839633,
To enable sdcard slot on sdmmc3, please make sure similar properties from sdmmc1 are present.
mmc-ocr-mask = <0x0>;
cd-inverted;
cd-gpios = <&tegra_main_gpio TEGRA194_MAIN_GPIO(G, 7) 0>;
nvidia,cd-wakeup-capable;
mmc-ocr-mask = <0>;
cd-inverted;
vmmc-supply = <&p3668_vdd_sdmmc1_sw>; //you need to use the correct regulator from your carrier board
status = "okay";
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Hi Wayne
Thank you. I’ve detect sd-card successfully.
hi,could you share some steps to change the io?
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Hi,
I think the DT patches here should be sufficient. What steps do you need?
I have enabled the SDMMC3 too,thank you
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Hi suen, how do you enable the sdmmc3
Yes.
Hi,
Where exactly do we need to make these changes?
Download the kernel source from website.
https://developer.nvidia.com/embedded/linux-tegra
Build the kernel from your host.
https://docs.nvidia.com/jetson/l4t/index.html
Refer to more documents from the DLC.
There is no special function pin called “SDMMC3_CD”. It is just a GPIO.
Hi @WayneWWW ,
How do i specify the enable pin for the SDMMC3 interface? I have it connected to GPIO3 in my carrier board.
Thanks