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pinctrl: mcp23s08: simplify spi_present_mask handling 

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Sebastian Reichel 2017-05-15 11:24:36 +02:00 committed by Linus Walleij
parent 5b1a7e803a
commit ce9bd0a0ff
3 changed files with 13 additions and 26 deletions
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4
arch/blackfin/mach-bf527/boards/tll6527m.c
View File

@ -351,11 +351,11 @@ static struct platform_device bfin_i2s = {
#if IS_ENABLED(CONFIG_PINCTRL_MCP23S08)
#include <linux/spi/mcp23s08.h>
static const struct mcp23s08_platform_data bfin_mcp23s08_sys_gpio_info = {
.chip[0].is_present = true,
.spi_present_mask = BIT(0),
.base = 0x30,
};
static const struct mcp23s08_platform_data bfin_mcp23s08_usr_gpio_info = {
.chip[2].is_present = true,
.spi_present_mask = BIT(2),
.base = 0x38,
};
#endif

29
drivers/pinctrl/pinctrl-mcp23s08.c
View File

@ -36,6 +36,8 @@
#define MCP_TYPE_017 3
#define MCP_TYPE_S18 4
#define MCP_MAX_DEV_PER_CS 8
/* Registers are all 8 bits wide.
*
* The mcp23s17 has twice as many bits, and can be configured to work
@ -1064,7 +1066,6 @@ static int mcp23s08_probe(struct spi_device *spi)
int status, type;
unsigned ngpio = 0;
const struct of_device_id *match;
u32 spi_present_mask = 0;
match = of_match_device(of_match_ptr(mcp23s08_spi_of_match), &spi->dev);
if (match)
@ -1078,36 +1079,26 @@ static int mcp23s08_probe(struct spi_device *spi)
pdata->base = -1;
status = device_property_read_u32(&spi->dev,
"microchip,spi-present-mask", &spi_present_mask);
"microchip,spi-present-mask", &pdata->spi_present_mask);
if (status) {
status = device_property_read_u32(&spi->dev,
"mcp,spi-present-mask", &spi_present_mask);
"mcp,spi-present-mask",
&pdata->spi_present_mask);
if (status) {
dev_err(&spi->dev, "missing spi-present-mask");
return -ENODEV;
}
}
} else {
for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) {
if (!pdata->chip[addr].is_present)
continue;
if ((type == MCP_TYPE_S08) && (addr > 3)) {
dev_err(&spi->dev,
"mcp23s08 only supports address 0..3");
return -EINVAL;
}
spi_present_mask |= BIT(addr);
}
}
if (!spi_present_mask || spi_present_mask >= 256) {
if (!pdata->spi_present_mask || pdata->spi_present_mask > 0xff) {
dev_err(&spi->dev, "invalid spi-present-mask");
return -ENODEV;
}
for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) {
if (spi_present_mask & BIT(addr))
for (addr = 0; addr < MCP_MAX_DEV_PER_CS; addr++) {
if (pdata->spi_present_mask & BIT(addr))
chips++;
}
@ -1122,8 +1113,8 @@ static int mcp23s08_probe(struct spi_device *spi)
spi_set_drvdata(spi, data);
for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) {
if (!(spi_present_mask & (1 << addr)))
for (addr = 0; addr < MCP_MAX_DEV_PER_CS; addr++) {
if (!(pdata->spi_present_mask & BIT(addr)))
continue;
chips--;
data->mcp[addr] = &data->chip[chips];

6
include/linux/spi/mcp23s08.h
View File

@ -1,10 +1,6 @@
/* FIXME driver should be able to handle IRQs... */
struct mcp23s08_chip_info {
bool is_present; /* true if populated */
};
struct mcp23s08_platform_data {
/* For mcp23s08, up to 4 slaves (numbered 0..3) can share one SPI
* chipselect, each providing 1 gpio_chip instance with 8 gpios.
@ -12,7 +8,7 @@ struct mcp23s08_platform_data {
* chipselect, each providing 1 gpio_chip (port A + port B) with
* 16 gpios.
*/
struct mcp23s08_chip_info chip[8];
u32 spi_present_mask;
/* "base" is the number of the first GPIO. Dynamic assignment is
* not currently supported, and even if there are gaps in chip