linux-kernel - [PATCH] gpio: mcp23s08: Add option to configure pullups.

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Date:   Fri, 21 Oct 2016 17:00:35 +0200
From:   Enric Balletbo i Serra <enric.balletbo@...labora.com>
To:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-gpio@...r.kernel.org
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>
Subject: [PATCH] gpio: mcp23s08: Add option to configure pullups.

Default is without pullups, but if property is specified in DT and the bit
is set, set a pullup on GPIO-n.

Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
---
 Documentation/devicetree/bindings/gpio/gpio-mcp23s08.txt | 1 +
 drivers/gpio/gpio-mcp23s08.c                             | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/gpio/gpio-mcp23s08.txt b/Documentation/devicetree/bindings/gpio/gpio-mcp23s08.txt
index c934106..40306b1 100644
--- a/Documentation/devicetree/bindings/gpio/gpio-mcp23s08.txt
+++ b/Documentation/devicetree/bindings/gpio/gpio-mcp23s08.txt
@@ -57,6 +57,7 @@ Optional device specific properties:
         On devices with only one interrupt output this property is useless.
 - microchip,irq-active-high: Sets the INTPOL flag in the IOCON register. This
         configures the IRQ output polarity as active high.
+- microchip,pullups : If n-th bit is set, set a pullup on GPIO-n.
 
 Example I2C (with interrupt):
 gpiom1: gpio@20 {
diff --git a/drivers/gpio/gpio-mcp23s08.c b/drivers/gpio/gpio-mcp23s08.c
index 99d37b5..0cedf82 100644
--- a/drivers/gpio/gpio-mcp23s08.c
+++ b/drivers/gpio/gpio-mcp23s08.c
@@ -766,7 +766,8 @@ static int mcp230xx_probe(struct i2c_client *client,
 	if (match) {
 		pdata = &local_pdata;
 		pdata->base = -1;
-		pdata->chip[0].pullups = 0;
+		of_property_read_u32(client->dev.of_node, "microchip,pullups",
+				     &pdata->chip[0].pullups);
 		pdata->irq_controller =	of_property_read_bool(
 					client->dev.of_node,
 					"interrupt-controller");
-- 
2.1.0