linux-kernel - [PATCH v2 02/10] dt-bindings: mmc: tegra: Add nvidia,only-1-8-v property

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Message-ID: <1532607560-11253-3-git-send-email-avienamo@nvidia.com>
Date:   Thu, 26 Jul 2018 15:19:12 +0300
From:   Aapo Vienamo <avienamo@...dia.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Mikko Perttunen <mperttunen@...dia.com>
CC:     <linux-mmc@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Aapo Vienamo <avienamo@...dia.com>
Subject: [PATCH v2 02/10] dt-bindings: mmc: tegra: Add nvidia,only-1-8-v property

Add a property to mark controllers which operate at a 1.8 V fixed I/O
voltage.

This feature of the hardware needs to be signaled this way because it
cannot be probed at runtime or reliably derived from other properties.

Signed-off-by: Aapo Vienamo <avienamo@...dia.com>
---
 Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt b/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt
index 90c214d..95010cf 100644
--- a/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt
+++ b/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt
@@ -45,6 +45,8 @@ Optional properties for Tegra210 and Tegra186:
   for controllers supporting multiple voltage levels. The order of names
   should correspond to the pin configuration states in pinctrl-0 and
   pinctrl-1.
+- nvidia,only-1-8-v : The presence of this property indicates that the
+  controller operates at a 1.8 V fixed I/O voltage.
 
 Example:
 sdhci@...b0000 {
-- 
2.7.4