Re: [PATCH v5 0/9] riscv: spacemit: enable SD card support with UHS modes for OrangePi RV2

From: Michael Opdenacker <michael.opdenacker@rootcommit.com>
To: Iker Pedrosa <ikerpedrosam@gmail.com>,
	Ulf Hansson <ulf.hansson@linaro.org>,
	Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzk+dt@kernel.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Adrian Hunter <adrian.hunter@intel.com>,
	Paul Walmsley <pjw@kernel.org>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Alexandre Ghiti <alex@ghiti.fr>, Yixun Lan <dlan@kernel.org>
Cc: michael.opdenacker@rootcommit.com,
	Javier Martinez Canillas <javierm@redhat.com>,
	linux-mmc@vger.kernel.org, devicetree@vger.kernel.org,
	linux-riscv@lists.infradead.org, spacemit@lists.linux.dev,
	linux-kernel@vger.kernel.org, Anand Moon <linux.amoon@gmail.com>,
	Trevor Gamblin <tgamblin@baylibre.com>
Subject: Re: [PATCH v5 0/9] riscv: spacemit: enable SD card support with UHS modes for OrangePi RV2
Date: Mon, 30 Mar 2026 09:19:47 +0000 (UTC)	[thread overview]
Message-ID: <17eb09e8-280d-4a41-8a8c-8c8287160e97@rootcommit.com> (raw)
In-Reply-To: <20260330-orangepi-sd-card-uhs-v5-0-bd853604322d@gmail.com>

Hi Iker

On 3/30/26 10:38 AM, Iker Pedrosa wrote:
> This series enables complete SD card support for the Spacemit K1-based
> OrangePi RV2 board, including UHS (Ultra High Speed) modes for
> high-performance SD card operation.
>
> Background
>
> The Spacemit K1 SoC includes an SDHCI controller capable of supporting
> SD cards up to UHS-I speeds (SDR104 at 208MHz). However, mainline
> currently lacks basic SD controller configuration, SDHCI driver
> enhancements for voltage switching and tuning, and power management
> infrastructure.
>
> Implementation
>
> The series enables SD card support through coordinated layers:
>
> - Hardware infrastructure (patches 1-2): Device tree bindings for voltage
> switching hardware and essential clock infrastructure.
> - SDHCI driver enhancements (patches 3-7): Regulator framework
> integration, pinctrl state switching for voltage domains, AIB register
> programming, and comprehensive SDR tuning support for reliable UHS
> operation.
> - SoC and board integration (patches 8-10): Complete K1 SoC controller
> definitions, PMIC power infrastructure, and OrangePi RV2 board enablement
> with full UHS support.
>
> This transforms the OrangePi RV2 from having no SD card support to full
> UHS-I capability, enabling high-performance storage up to 208MHz.
>
> Signed-off-by: Iker Pedrosa <ikerpedrosam@gmail.com>
> ---
> Changes in v5:
> - Document optional pinctrl-names property supporting "default" and
>    "state_uhs" pinctrl states for coordinating pin configuration changes
>    during UHS-I voltage switching.
> - Link to v4: https://lore.kernel.org/r/20260323-orangepi-sd-card-uhs-v4-0-567c9775fd0e@gmail.com

Thanks for the update!
Successfully tested on OrangePi RV2 (on top of mmc-next... doesn't work 
on top of master).

Tested-by: Michael Opdenacker <michael.opdenacker@rootcommit.com>

I'm excited to have this feature in the next kernel.
Cheers
Michael.

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