linux-kernel - [PATCH v2 1/2] dt-bindings: mmc: sdhci-am654: Add flag to force setting of TESTCD bit

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Message-ID: <20220425063120.10135-2-a-govindraju@ti.com>
Date:   Mon, 25 Apr 2022 12:01:19 +0530
From:   Aswath Govindraju <a-govindraju@...com>
To:     unlisted-recipients:; (no To-header on input)
CC:     Vignesh Raghavendra <vigneshr@...com>,
        Aswath Govindraju <a-govindraju@...com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        <linux-mmc@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 1/2] dt-bindings: mmc: sdhci-am654: Add flag to force setting of TESTCD bit

The ARASAN MMC controller on Keystone 3 class of devices needs the SDCD
line to be connected for proper functioning. Similar to the issue pointed
out in sdhci-of-arasan.c driver, commit 3794c542641f ("mmc:
sdhci-of-arasan: Set controller to test mode when no CD bit").

In cases where SDCD line is not connected, adding
"ti,fails-without-test-cd" in the DT node helps to indicate the
controller, that the SDCD line has been pulled down, using the TESTCD bit.

Signed-off-by: Aswath Govindraju <a-govindraju@...com>
---
 Documentation/devicetree/bindings/mmc/sdhci-am654.yaml | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/mmc/sdhci-am654.yaml b/Documentation/devicetree/bindings/mmc/sdhci-am654.yaml
index 0566493c4def..0ab07759b472 100644
--- a/Documentation/devicetree/bindings/mmc/sdhci-am654.yaml
+++ b/Documentation/devicetree/bindings/mmc/sdhci-am654.yaml
@@ -186,6 +186,13 @@ properties:
     description: Clock Delay Buffer Select
     $ref: "/schemas/types.yaml#/definitions/uint32"
 
+  ti,fails-without-test-cd:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      When present, indicates that the CD line is not connected
+      and the controller is required to be forced into Test mode
+      to set the TESTCD bit.
+
 required:
   - compatible
   - reg
-- 
2.17.1