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@xxxxxxxxxxxxx>
---
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
--
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