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From 0be0dc3a75279c4621ff45a027ffad5ddc9810c7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Timo=20Ter=C3=A4s?= <timo.teras@iki.fi>
Date: Mon, 30 Nov 2015 16:24:25 +0200
Subject: [PATCH] gpio: mcp23s08: support setting pullups from device tree data
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Make pullup configurable from device tree data.
Signed-off-by: Timo Teräs <timo.teras@iki.fi>
---
Documentation/devicetree/bindings/gpio/gpio-mcp23s08.txt | 1 +
drivers/gpio/gpio-mcp23s08.c | 14 +++++++++++---
2 files changed, 12 insertions(+), 3 deletions(-)
diff --git a/Documentation/devicetree/bindings/gpio/gpio-mcp23s08.txt b/Documentation/devicetree/bindings/gpio/gpio-mcp23s08.txt
index f3332b9..c7d2128 100644
--- a/Documentation/devicetree/bindings/gpio/gpio-mcp23s08.txt
+++ b/Documentation/devicetree/bindings/gpio/gpio-mcp23s08.txt
@@ -59,6 +59,7 @@ 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: Configuration value for GPPU register.
Example I2C (with interrupt):
gpiom1: gpio@20 {
diff --git a/drivers/gpio/gpio-mcp23s08.c b/drivers/gpio/gpio-mcp23s08.c
index 73db7ec..2320230 100644
--- a/drivers/gpio/gpio-mcp23s08.c
+++ b/drivers/gpio/gpio-mcp23s08.c
@@ -786,9 +786,12 @@ static int mcp230xx_probe(struct i2c_client *client,
match = of_match_device(of_match_ptr(mcp23s08_i2c_of_match),
&client->dev);
if (match) {
+ u32 pullups = 0;
pdata = &local_pdata;
pdata->base = -1;
- pdata->chip[0].pullups = 0;
+ of_property_read_u32(client->dev.of_node, "microchip,pullups",
+ &pullups);
+ pdata->chip[0].pullups = pullups;
pdata->irq_controller = of_property_read_bool(
client->dev.of_node,
"interrupt-controller");
@@ -910,9 +913,14 @@ static int mcp23s08_probe(struct spi_device *spi)
pdata = &local_pdata;
pdata->base = -1;
for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) {
- pdata->chip[addr].pullups = 0;
- if (spi_present_mask & (1 << addr))
+ u32 pullups = 0;
+ if (spi_present_mask & (1 << addr)) {
+ of_property_read_u32_index(spi->dev.of_node,
+ "microchip,pullups",
+ addr, &pullups);
chips++;
+ }
+ pdata->chip[addr].pullups = pullups;
}
pdata->irq_controller = of_property_read_bool(
spi->dev.of_node,
--
2.6.3
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