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pinctrl: mcp23s08: Use for_each_set_bit() and hweight_long()

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Here is a simplification of SPI code by using for_each_set_bit() and
hweight_long() library functions.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20200407173849.43628-8-andriy.shevchenko@linux.intel.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Andy Shevchenko 2020-04-07 20:38:48 +03:00 committed by Linus Walleij
parent 1ac30db20b
commit 7b04aaaf66
1 changed files with 11 additions and 19 deletions
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30
drivers/pinctrl/pinctrl-mcp23s08.c
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@ -1,6 +1,7 @@
// SPDX-License-Identifier: GPL-2.0-only
/* MCP23S08 SPI/I2C GPIO driver */
#include <linux/bitops.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/mutex.h>
@ -940,13 +941,14 @@ static int mcp23s08_spi_regmap_init(struct mcp23s08 *mcp, struct device *dev,
static int mcp23s08_probe(struct spi_device *spi)
{
struct device *dev = &spi->dev;
unsigned long spi_present_mask;
const void *match;
int chips;
u32 v;
unsigned addr;
int chips = 0;
struct mcp23s08_driver_data *data;
int status, type;
unsigned ngpio = 0;
u32 spi_present_mask;
match = device_get_match_data(dev);
if (match)
@ -954,29 +956,22 @@ static int mcp23s08_probe(struct spi_device *spi)
else
type = spi_get_device_id(spi)->driver_data;
status = device_property_read_u32(&spi->dev,
"microchip,spi-present-mask", &spi_present_mask);
status = device_property_read_u32(dev, "microchip,spi-present-mask", &v);
if (status) {
status = device_property_read_u32(&spi->dev,
"mcp,spi-present-mask", &spi_present_mask);
status = device_property_read_u32(dev, "mcp,spi-present-mask", &v);
if (status) {
dev_err(&spi->dev, "missing spi-present-mask");
return status;
}
}
spi_present_mask = v;
if (!spi_present_mask || spi_present_mask > 0xff) {
if (!spi_present_mask || spi_present_mask >= BIT(MCP_MAX_DEV_PER_CS)) {
dev_err(&spi->dev, "invalid spi-present-mask");
return -ENODEV;
}
for (addr = 0; addr < MCP_MAX_DEV_PER_CS; addr++) {
if (spi_present_mask & BIT(addr))
chips++;
}
if (!chips)
return -ENODEV;
chips = hweight_long(spi_present_mask);
data = devm_kzalloc(&spi->dev,
struct_size(data, chip, chips), GFP_KERNEL);
@ -985,11 +980,8 @@ static int mcp23s08_probe(struct spi_device *spi)
spi_set_drvdata(spi, data);
for (addr = 0; addr < MCP_MAX_DEV_PER_CS; addr++) {
if (!(spi_present_mask & BIT(addr)))
continue;
chips--;
data->mcp[addr] = &data->chip[chips];
for_each_set_bit(addr, &spi_present_mask, MCP_MAX_DEV_PER_CS) {
data->mcp[addr] = &data->chip[--chips];
data->mcp[addr]->irq = spi->irq;
status = mcp23s08_spi_regmap_init(data->mcp[addr], dev, addr, type);