Re: [PATCH 1/2] riscv: dts: spacemit: Add i2c buses on OrangePi RV2

From: Michael Opdenacker <michael.opdenacker@rootcommit.com>
To: Iker Pedrosa <ikerpedrosam@gmail.com>
Cc: michael.opdenacker@rootcommit.com, Yao Zi <me@ziyao.cc>,
	Yixun Lan <dlan@gentoo.org>,
	Dan Carpenter <dan.carpenter@linaro.org>,
	Binbin Zhou <zhoubinbin@loongson.cn>,
	linux-riscv@lists.infradead.org, spacemit@lists.linux.dev
Subject: Re: [PATCH 1/2] riscv: dts: spacemit: Add i2c buses on OrangePi RV2
Date: Wed, 17 Dec 2025 16:27:16 +0000 (UTC)	[thread overview]
Message-ID: <1626d445-fa7b-4527-b1d9-4d141d8b5ee5@rootcommit.com> (raw)
In-Reply-To: <CABdCQ=Orw0ULhPm43rAhS_iqqNYU4nChcPCqh8UdFhJUumVG5w@mail.gmail.com>

Hi Iker

On 12/17/25 16:26, Iker Pedrosa wrote:
> Hi Michael,
>
> Based on the discussion and Javier's feedback, to make the SD card
> work properly, we need to patch the driver to implement the following:
>
> Define a separate compatible string: the eMMC slot has a PHY, while
> SD/SDIO slots do not. We need to differentiate them to apply the
> correct reset logic (skipping PHY init for SD).
> Extend the pinctrl driver: support is needed for switching the SD
> voltage pins from 3.3V to 1.8V.
> Add tuning logic: this is required at least for SDR modes.
>
> If you don't mind, I'll start working on point #1. Feel free to choose
> any other task.
>
> I'll post a patch once I have it working.

Wow, that would be awesome indeed, all the more as my time is quite 
limited. Please do!
I'll have a look at other aspects if I can, like USB and PCI Express.

Note that I have an eMMC module if you have code to test, and I have the 
BananaPI F3 too which also has eMMC.
Happy to work together :)
Cheers
Michael.

-- 
Michael Opdenacker
Root Commit
Yocto Project and OpenEmbedded Training course - Learn by doing:
https://rootcommit.com/training/yocto/

_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv