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-rw-r--r--drivers/gpio/Kconfig1
-rw-r--r--drivers/gpio/gpio-mcp23s08.c64
-rw-r--r--include/linux/spi/mcp23s08.h18
3 files changed, 52 insertions, 31 deletions
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index ec27ec0be8c2..ec398bee7c60 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -806,7 +806,6 @@ config GPIO_MAX7301
config GPIO_MCP23S08
tristate "Microchip MCP23xxx I/O expander"
- depends on OF_GPIO
depends on (SPI_MASTER && !I2C) || I2C
help
SPI/I2C driver for Microchip MCP23S08/MCP23S17/MCP23008/MCP23017
diff --git a/drivers/gpio/gpio-mcp23s08.c b/drivers/gpio/gpio-mcp23s08.c
index 6f183d9b487e..8488e2fd307c 100644
--- a/drivers/gpio/gpio-mcp23s08.c
+++ b/drivers/gpio/gpio-mcp23s08.c
@@ -479,7 +479,7 @@ static int mcp23s08_irq_setup(struct mcp23s08 *mcp)
mutex_init(&mcp->irq_lock);
- mcp->irq_domain = irq_domain_add_linear(chip->of_node, chip->ngpio,
+ mcp->irq_domain = irq_domain_add_linear(chip->dev->of_node, chip->ngpio,
&irq_domain_simple_ops, mcp);
if (!mcp->irq_domain)
return -ENODEV;
@@ -581,7 +581,7 @@ done:
static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
void *data, unsigned addr, unsigned type,
- unsigned base, unsigned pullups)
+ struct mcp23s08_platform_data *pdata, int cs)
{
int status;
bool mirror = false;
@@ -635,7 +635,7 @@ static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
return -EINVAL;
}
- mcp->chip.base = base;
+ mcp->chip.base = pdata->base;
mcp->chip.can_sleep = true;
mcp->chip.dev = dev;
mcp->chip.owner = THIS_MODULE;
@@ -648,11 +648,9 @@ static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
if (status < 0)
goto fail;
- mcp->irq_controller = of_property_read_bool(mcp->chip.of_node,
- "interrupt-controller");
+ mcp->irq_controller = pdata->irq_controller;
if (mcp->irq && mcp->irq_controller && (type == MCP_TYPE_017))
- mirror = of_property_read_bool(mcp->chip.of_node,
- "microchip,irq-mirror");
+ mirror = pdata->mirror;
if ((status & IOCON_SEQOP) || !(status & IOCON_HAEN) || mirror) {
/* mcp23s17 has IOCON twice, make sure they are in sync */
@@ -668,7 +666,7 @@ static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
}
/* configure ~100K pullups */
- status = mcp->ops->write(mcp, MCP_GPPU, pullups);
+ status = mcp->ops->write(mcp, MCP_GPPU, pdata->chip[cs].pullups);
if (status < 0)
goto fail;
@@ -768,25 +766,29 @@ MODULE_DEVICE_TABLE(of, mcp23s08_i2c_of_match);
static int mcp230xx_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
- struct mcp23s08_platform_data *pdata;
+ struct mcp23s08_platform_data *pdata, local_pdata;
struct mcp23s08 *mcp;
- int status, base, pullups;
+ int status;
const struct of_device_id *match;
match = of_match_device(of_match_ptr(mcp23s08_i2c_of_match),
&client->dev);
- pdata = dev_get_platdata(&client->dev);
- if (match || !pdata) {
- base = -1;
- pullups = 0;
+ if (match) {
+ pdata = &local_pdata;
+ pdata->base = -1;
+ pdata->chip[0].pullups = 0;
+ pdata->irq_controller = of_property_read_bool(
+ client->dev.of_node,
+ "interrupt-controller");
+ pdata->mirror = of_property_read_bool(client->dev.of_node,
+ "microchip,irq-mirror");
client->irq = irq_of_parse_and_map(client->dev.of_node, 0);
} else {
- if (!gpio_is_valid(pdata->base)) {
+ pdata = dev_get_platdata(&client->dev);
+ if (!pdata || !gpio_is_valid(pdata->base)) {
dev_dbg(&client->dev, "invalid platform data\n");
return -EINVAL;
}
- base = pdata->base;
- pullups = pdata->chip[0].pullups;
}
mcp = kzalloc(sizeof(*mcp), GFP_KERNEL);
@@ -795,7 +797,7 @@ static int mcp230xx_probe(struct i2c_client *client,
mcp->irq = client->irq;
status = mcp23s08_probe_one(mcp, &client->dev, client, client->addr,
- id->driver_data, base, pullups);
+ id->driver_data, pdata, 0);
if (status)
goto fail;
@@ -863,14 +865,12 @@ static void mcp23s08_i2c_exit(void) { }
static int mcp23s08_probe(struct spi_device *spi)
{
- struct mcp23s08_platform_data *pdata;
+ struct mcp23s08_platform_data *pdata, local_pdata;
unsigned addr;
int chips = 0;
struct mcp23s08_driver_data *data;
int status, type;
- unsigned base = -1,
- ngpio = 0,
- pullups[ARRAY_SIZE(pdata->chip)];
+ unsigned ngpio = 0;
const struct of_device_id *match;
u32 spi_present_mask = 0;
@@ -893,11 +893,18 @@ static int mcp23s08_probe(struct spi_device *spi)
return -ENODEV;
}
+ pdata = &local_pdata;
+ pdata->base = -1;
for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) {
- pullups[addr] = 0;
+ pdata->chip[addr].pullups = 0;
if (spi_present_mask & (1 << addr))
chips++;
}
+ pdata->irq_controller = of_property_read_bool(
+ spi->dev.of_node,
+ "interrupt-controller");
+ pdata->mirror = of_property_read_bool(spi->dev.of_node,
+ "microchip,irq-mirror");
} else {
type = spi_get_device_id(spi)->driver_data;
pdata = dev_get_platdata(&spi->dev);
@@ -917,10 +924,7 @@ static int mcp23s08_probe(struct spi_device *spi)
return -EINVAL;
}
spi_present_mask |= 1 << addr;
- pullups[addr] = pdata->chip[addr].pullups;
}
-
- base = pdata->base;
}
if (!chips)
@@ -938,13 +942,13 @@ static int mcp23s08_probe(struct spi_device *spi)
chips--;
data->mcp[addr] = &data->chip[chips];
status = mcp23s08_probe_one(data->mcp[addr], &spi->dev, spi,
- 0x40 | (addr << 1), type, base,
- pullups[addr]);
+ 0x40 | (addr << 1), type, pdata,
+ addr);
if (status < 0)
goto fail;
- if (base != -1)
- base += (type == MCP_TYPE_S17) ? 16 : 8;
+ if (pdata->base != -1)
+ pdata->base += (type == MCP_TYPE_S17) ? 16 : 8;
ngpio += (type == MCP_TYPE_S17) ? 16 : 8;
}
data->ngpio = ngpio;
diff --git a/include/linux/spi/mcp23s08.h b/include/linux/spi/mcp23s08.h
index 2d676d5aaa89..aa07d7b32568 100644
--- a/include/linux/spi/mcp23s08.h
+++ b/include/linux/spi/mcp23s08.h
@@ -22,4 +22,22 @@ struct mcp23s08_platform_data {
* base to base+15 (or base+31 for s17 variant).
*/
unsigned base;
+ /* Marks the device as a interrupt controller.
+ * NOTE: The interrupt functionality is only supported for i2c
+ * versions of the chips. The spi chips can also do the interrupts,
+ * but this is not supported by the linux driver yet.
+ */
+ bool irq_controller;
+
+ /* Sets the mirror flag in the IOCON register. Devices
+ * with two interrupt outputs (these are the devices ending with 17 and
+ * those that have 16 IOs) have two IO banks: IO 0-7 form bank 1 and
+ * IO 8-15 are bank 2. These chips have two different interrupt outputs:
+ * One for bank 1 and another for bank 2. If irq-mirror is set, both
+ * interrupts are generated regardless of the bank that an input change
+ * occurred on. If it is not set, the interrupt are only generated for
+ * the bank they belong to.
+ * On devices with only one interrupt output this property is useless.
+ */
+ bool mirror;
};
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-24 06:50:43 +0000