From: Linus Walleij <linus.walleij@linaro.org>
To: linux-mmc@vger.kernel.org, Ulf Hansson <ulf.hansson@linaro.org>
Cc: Linus Walleij <linus.walleij@linaro.org>, devicetree@vger.kernel.org
Subject: [PATCH] dt-bindings: mmc: Add small binding node on level shifters
Date: Sun, 17 Apr 2022 16:42:23 +0200 [thread overview]
Message-ID: <20220417144223.649201-1-linus.walleij@linaro.org> (raw)
The VQMMC is often provided by a level shifter, so drop a small note
in the bindings that this can be the case and how that is done.
It is helpful information since this is pretty common.
Cc: devicetree@vger.kernel.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
Documentation/devicetree/bindings/mmc/mmc-controller.yaml | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/mmc/mmc-controller.yaml b/Documentation/devicetree/bindings/mmc/mmc-controller.yaml
index 513f3c8758aa..ff5ce89e5111 100644
--- a/Documentation/devicetree/bindings/mmc/mmc-controller.yaml
+++ b/Documentation/devicetree/bindings/mmc/mmc-controller.yaml
@@ -298,7 +298,10 @@ properties:
vqmmc-supply:
description:
- Supply for the bus IO line power
+ Supply for the bus IO line power, such as a level shifter.
+ If the level shifter is controlled by a GPIO line, this shall
+ be modeled as a "regulator-fixed" with a GPIO line for
+ switching the level shifter on/off.
mmc-pwrseq:
$ref: /schemas/types.yaml#/definitions/phandle
--
2.35.1
next reply other threads:[~2022-04-17 14:44 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-17 14:42 Linus Walleij [this message]
2022-04-21 13:54 ` [PATCH] dt-bindings: mmc: Add small binding node on level shifters Ulf Hansson
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