linux-kernel - [PATCH 1/2] dt-bindings: mmc: mmc-pwrseq-simple: add support for reset control

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Message-Id: <20241004120740.2887776-1-catalin.popescu@leica-geosystems.com>
Date: Fri,  4 Oct 2024 14:07:39 +0200
From: Catalin Popescu <catalin.popescu@...ca-geosystems.com>
To: ulf.hansson@...aro.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	p.zabel@...gutronix.de
Cc: linux-mmc@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	m.felsch@...gutronix.de,
	bsp-development.geo@...ca-geosystems.com,
	Catalin Popescu <catalin.popescu@...ca-geosystems.com>
Subject: [PATCH 1/2] dt-bindings: mmc: mmc-pwrseq-simple: add support for reset control

Add compatible value "mmc-pwrseq-simple-reset" to support reset control
instead of gpios. Reset controls being refcounted, they allow to use
shared resets or gpios across drivers. Support of reset control is
limited to one single reset control.

Signed-off-by: Catalin Popescu <catalin.popescu@...ca-geosystems.com>
---
 .../bindings/mmc/mmc-pwrseq-simple.yaml       | 21 +++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.yaml b/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.yaml
index 00feaafc1063..da218260af01 100644
--- a/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.yaml
+++ b/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.yaml
@@ -16,12 +16,13 @@ description:
 
 properties:
   compatible:
-    const: mmc-pwrseq-simple
+    enum:
+      - mmc-pwrseq-simple
+      - mmc-pwrseq-simple-reset
 
   reset-gpios:
     minItems: 1
     # Put some limit to avoid false warnings
-    maxItems: 32
     description:
       contains a list of GPIO specifiers. The reset GPIOs are asserted
       at initialization and prior we start the power up procedure of the card.
@@ -50,6 +51,22 @@ properties:
 required:
   - compatible
 
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - mmc-pwrseq-simple-reset
+    then:
+      properties:
+        reset-gpios:
+          maxItems: 1
+    else:
+      properties:
+        reset-gpios:
+          maxItems: 32
+
 additionalProperties: false
 
 examples:
-- 
2.34.1