linux-kernel - [PATCH RFC 1/2] dt-bindings: mmc: sdhci-pxa: add state

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Message-Id: <20250718-pxav3-uhs-v1-1-2e451256f1f6@dujemihanovic.xyz>
Date: Fri, 18 Jul 2025 23:12:38 +0200
From: Duje Mihanović <duje@...emihanovic.xyz>
To: Ulf Hansson <ulf.hansson@...aro.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Adrian Hunter <adrian.hunter@...el.com>
Cc: Karel Balej <balejk@...fyz.cz>, David Wronek <david@...nlining.org>, 
 linux-mmc@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, phone-devel@...r.kernel.org, 
 ~postmarketos/upstreaming@...ts.sr.ht, 
 Duje Mihanović <duje@...emihanovic.xyz>
Subject: [PATCH RFC 1/2] dt-bindings: mmc: sdhci-pxa: add state_uhs pinctrl

On the pxav3 controller, increasing the drive strength of the data pins
might be required to maintain stability on fast bus clocks (above 100
MHz). Add a state_uhs pinctrl to allow this.

The existing state_cmd_gpio pinctrl is changed to apply only on pxav1 as
it's unneeded on the other controllers.

Signed-off-by: Duje Mihanović <duje@...emihanovic.xyz>
---
 .../devicetree/bindings/mmc/sdhci-pxa.yaml         | 45 +++++++++++++++++-----
 1 file changed, 35 insertions(+), 10 deletions(-)

diff --git a/Documentation/devicetree/bindings/mmc/sdhci-pxa.yaml b/Documentation/devicetree/bindings/mmc/sdhci-pxa.yaml
index 4869ddef36fd89265a1bfe96bb9663b553ac5084..7a9e2a63ac4351aea10b2763ca250ce4889df1eb 100644
--- a/Documentation/devicetree/bindings/mmc/sdhci-pxa.yaml
+++ b/Documentation/devicetree/bindings/mmc/sdhci-pxa.yaml
@@ -30,6 +30,39 @@ allOf:
           maxItems: 1
         reg-names:
           maxItems: 1
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: mrvl,pxav1-mmc
+    then:
+      properties:
+        pinctrl-names:
+          description:
+            Optional for supporting PXA168 SDIO IRQ errata to switch CMD pin between
+            SDIO CMD and GPIO mode.
+          items:
+            - const: default
+            - const: state_cmd_gpio
+        pinctrl-1:
+          description:
+            Should switch CMD pin to GPIO mode as a high output.
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: mrvl,pxav3-mmc
+    then:
+      properties:
+        pinctrl-names:
+          description:
+            Optional for increasing stability of the controller at fast bus clocks.
+          items:
+            - const: default
+            - const: state_uhs
+        pinctrl-1:
+          description:
+            Should switch the drive strength of the data pins to high.
 
 properties:
   compatible:
@@ -62,21 +95,13 @@ properties:
       - const: io
       - const: core
 
-  pinctrl-names:
-    description:
-      Optional for supporting PXA168 SDIO IRQ errata to switch CMD pin between
-      SDIO CMD and GPIO mode.
-    items:
-      - const: default
-      - const: state_cmd_gpio
+  pinctrl-names: true
 
   pinctrl-0:
     description:
       Should contain default pinctrl.
 
-  pinctrl-1:
-    description:
-      Should switch CMD pin to GPIO mode as a high output.
+  pinctrl-1: true
 
   mrvl,clk-delay-cycles:
     description: Specify a number of cycles to delay for tuning.

-- 
2.50.1