linux-kernel - [PATCH v4 2/6] nfc: pn532_uart: Add NXP PN532 to devicetree docs

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Date:   Thu,  1 Nov 2018 11:02:10 +0100
From:   Lars Poeschel <poeschel@...onage.de>
To:     devicetree@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "GitAuthor: Lars Poeschel" <poeschel@...onage.de>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v4 2/6] nfc: pn532_uart: Add NXP PN532 to devicetree docs

Add a simple binding doc for the pn532.

Signed-off-by: Lars Poeschel <poeschel@...onage.de>
---
Changes in v4:
- Add documentation about reg property in case of i2c

Changes in v3:
- seperate binding doc instead of entry in trivial-devices.txt

 .../devicetree/bindings/nfc/pn532.txt         | 33 +++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/nfc/pn532.txt

diff --git a/Documentation/devicetree/bindings/nfc/pn532.txt b/Documentation/devicetree/bindings/nfc/pn532.txt
new file mode 100644
index 000000000000..d5aaa588073d
--- /dev/null
+++ b/Documentation/devicetree/bindings/nfc/pn532.txt
@@ -0,0 +1,33 @@
+NXP PN532 NFC Chip
+
+Required properties:
+- compatible: Should be
+    - "nxp,pn532" Place a node with this inside the devicetree node of the bus
+                  where the NFC chip is connected to.
+                  Currently the kernel has phy bindings for uart and i2c.
+    - "nxp,pn532-i2c" (DEPRECATED) only works for the i2c binding.
+    - "nxp,pn533-i2c" (DEPRECATED) only works for the i2c binding.
+
+Required properties if connected on i2c:
+- reg: for the i2c bus address. This is fixed at 0x48 for the PN532.
+
+Example uart:
+
+uart4: serial@...42000 {
+        compatible = "ti,omap3-uart";
+
+        pn532: nfc {
+                compatible = "nxp,pn532";
+        };
+};
+
+Example i2c:
+
+i2c1: i2c@0 {
+        compatible = "ti,omap3-i2c";
+
+        pn532: nfc {
+                compatible = "nxp,pn532";
+                reg = <0x48>;
+        };
+};
-- 
2.19.1