71 lines
1.9 KiB
Diff
71 lines
1.9 KiB
Diff
--- a/drivers/gpio/gpio-74x164.c
|
|
+++ b/drivers/gpio/gpio-74x164.c
|
|
@@ -107,8 +107,18 @@ static int gen_74x164_direction_output(s
|
|
static int gen_74x164_probe(struct spi_device *spi)
|
|
{
|
|
struct gen_74x164_chip *chip;
|
|
+ struct gen_74x164_chip_platform_data *pdata;
|
|
+ struct device_node *np;
|
|
int ret;
|
|
|
|
+ pdata = spi->dev.platform_data;
|
|
+ np = spi->dev.of_node;
|
|
+
|
|
+ if (!np && !pdata) {
|
|
+ dev_err(&spi->dev, "No configuration data available.\n");
|
|
+ return -EINVAL;
|
|
+ }
|
|
+
|
|
/*
|
|
* bits_per_word cannot be configured in platform data
|
|
*/
|
|
@@ -130,18 +140,27 @@ static int gen_74x164_probe(struct spi_d
|
|
chip->gpio_chip.set = gen_74x164_set_value;
|
|
chip->gpio_chip.base = -1;
|
|
|
|
- if (of_property_read_u32(spi->dev.of_node, "registers-number",
|
|
- &chip->registers)) {
|
|
- dev_err(&spi->dev,
|
|
- "Missing registers-number property in the DT.\n");
|
|
- return -EINVAL;
|
|
+ if (np) {
|
|
+ if (of_property_read_u32(spi->dev.of_node, "registers-number", &chip->registers)) {
|
|
+ dev_err(&spi->dev, "Missing registers-number property in the DT.\n");
|
|
+ ret = -EINVAL;
|
|
+ goto exit_destroy;
|
|
+ }
|
|
+ } else if (pdata) {
|
|
+ chip->registers = pdata->num_registers;
|
|
}
|
|
|
|
+ if (!chip->registers)
|
|
+ chip->registers = 1;
|
|
+
|
|
chip->gpio_chip.ngpio = GEN_74X164_NUMBER_GPIOS * chip->registers;
|
|
chip->buffer = devm_kzalloc(&spi->dev, chip->registers, GFP_KERNEL);
|
|
if (!chip->buffer)
|
|
return -ENOMEM;
|
|
|
|
+ if (pdata && pdata->init_data)
|
|
+ memcpy(chip->buffer, pdata->init_data, chip->registers);
|
|
+
|
|
chip->gpio_chip.can_sleep = true;
|
|
chip->gpio_chip.dev = &spi->dev;
|
|
chip->gpio_chip.owner = THIS_MODULE;
|
|
--- /dev/null
|
|
+++ b/include/linux/spi/74x164.h
|
|
@@ -0,0 +1,13 @@
|
|
+#ifndef LINUX_SPI_74X164_H
|
|
+#define LINUX_SPI_74X164_H
|
|
+
|
|
+struct gen_74x164_chip_platform_data {
|
|
+ /* number assigned to the first GPIO */
|
|
+ unsigned base;
|
|
+ /* number of chained registers */
|
|
+ unsigned num_registers;
|
|
+ /* address of a buffer containing initial data */
|
|
+ u8 *init_data;
|
|
+};
|
|
+
|
|
+#endif
|