From: Yixun Lan <dlan@kernel.org>
To: Ulf Hansson <ulfh@kernel.org>, Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>,
Adrian Hunter <adrian.hunter@intel.com>
Cc: Long Wan <long.wan@linux.spacemit.com>,
linux-mmc@vger.kernel.org, devicetree@vger.kernel.org,
linux-riscv@lists.infradead.org, spacemit@lists.linux.dev,
linux-kernel@vger.kernel.org, Yixun Lan <dlan@kernel.org>
Subject: [PATCH 1/4] dt-bindings: mmc: spacemit-sdhci: Add clock-frequency property
Date: Wed, 02 Sep 2026 07:03:12 +0000 [thread overview]
Message-ID: <20260902-07-k3-sdhci-dts-v1-1-4e7909cf4233@kernel.org> (raw)
In-Reply-To: <20260902-07-k3-sdhci-dts-v1-0-4e7909cf4233@kernel.org>
From: Long Wan <long.wan@linux.spacemit.com>
Add a clock-frequency property to set the rate of io clock, according
to various host controller mode it require different initial clock
frequency, and also match to the board's layout actually validated at.
Signed-off-by: Long Wan <long.wan@linux.spacemit.com>
Signed-off-by: Yixun Lan <dlan@kernel.org>
---
Documentation/devicetree/bindings/mmc/spacemit,sdhci.yaml | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/Documentation/devicetree/bindings/mmc/spacemit,sdhci.yaml b/Documentation/devicetree/bindings/mmc/spacemit,sdhci.yaml
index 34d202af909f..f35bf7ce08dd 100644
--- a/Documentation/devicetree/bindings/mmc/spacemit,sdhci.yaml
+++ b/Documentation/devicetree/bindings/mmc/spacemit,sdhci.yaml
@@ -29,6 +29,13 @@ properties:
- description: core clock, used by internal controller
- description: io clock, output for SD, SDIO, eMMC device
+ clock-frequency:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ Rate of the io clock in Hz. When present the io clock is programmed to
+ this rate, allowing a board to select the rate its layout was validated
+ at.
+
clock-names:
items:
- const: core
--
2.55.0
next prev parent reply other threads:[~2026-09-02 7:03 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-02 7:03 [PATCH 0/4] mmc: spacemit: Introduce two DT properties Yixun Lan
2026-09-02 7:03 ` Yixun Lan [this message]
2026-09-02 7:11 ` [PATCH 1/4] dt-bindings: mmc: spacemit-sdhci: Add clock-frequency property sashiko-bot
2026-09-02 9:08 ` Yixun Lan
2026-09-02 7:03 ` [PATCH 2/4] dt-bindings: mmc: spacemit,sdhci: Add tx delay property Yixun Lan
2026-09-02 18:03 ` Conor Dooley
2026-09-02 7:03 ` [PATCH 3/4] mmc: sdhci-of-k1: Set clock-frequency of io clock Yixun Lan
2026-09-02 7:14 ` sashiko-bot
2026-09-02 7:03 ` [PATCH 4/4] mmc: sdhci-of-k1: Add TX tuning parameter Yixun Lan
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