linux-kernel - [PATCH 6/7] misc: eeprom: 93xx46: Add DT binding for a GPIO 'select' line.

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Date:	Mon, 16 Nov 2015 23:16:35 -0500
From:	Cory Tusar <cory.tusar@...1solutions.com>
To:	robh+dt@...nel.org, pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org, agust@...x.de,
	gregkh@...uxfoundation.org
Cc:	jic23@...nel.org, vz@...ia.com, broonie@...nel.org, afd@...com,
	andrew@...n.ch, Chris.Healy@....aero, Keith.Vennel@....aero,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	Cory Tusar <cory.tusar@...1solutions.com>
Subject: [PATCH 6/7] misc: eeprom: 93xx46: Add DT binding for a GPIO 'select' line.

This commit documents an additional devicetree binding in the
eeprom_93x46 driver allowing a GPIO line to function as a 'select'
or 'enable' signal prior to accessing the EEPROM.

Signed-off-by: Cory Tusar <cory.tusar@...1solutions.com>
---
 Documentation/devicetree/bindings/misc/eeprom-93xx46.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/misc/eeprom-93xx46.txt b/Documentation/devicetree/bindings/misc/eeprom-93xx46.txt
index 34a0cc2..75b16f4 100644
--- a/Documentation/devicetree/bindings/misc/eeprom-93xx46.txt
+++ b/Documentation/devicetree/bindings/misc/eeprom-93xx46.txt
@@ -6,6 +6,8 @@ Required properties:
 
 Optional properties:
 - read-only : parameter-less property which disables writes to the EEPROM
+- select-gpio : if present, specifies the GPIO that will be asserted prior to
+  each access to the EEPROM (e.g. for SPI bus multiplexing)
 
 Property rules described in Documentation/devicetree/bindings/spi/spi-bus.txt
 apply.  In particular, "reg" and "spi-max-frequency" properties must be given.
@@ -17,4 +19,5 @@ Example:
 		spi-max-frequency = <1000000>;
 		spi-cs-high;
 		data-size = <8>;
+		select-gpio = <&gpio4 4 GPIO_ACTIVE_HIGH>;
 	};
-- 
2.4.10

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