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-rw-r--r--target/linux/ar71xx/patches-3.10/451-gpio-74x164-improve-platform-device-support.patch74
1 files changed, 74 insertions, 0 deletions
diff --git a/target/linux/ar71xx/patches-3.10/451-gpio-74x164-improve-platform-device-support.patch b/target/linux/ar71xx/patches-3.10/451-gpio-74x164-improve-platform-device-support.patch
new file mode 100644
index 0000000000..b19bb85c85
--- /dev/null
+++ b/target/linux/ar71xx/patches-3.10/451-gpio-74x164-improve-platform-device-support.patch
@@ -0,0 +1,74 @@
+--- a/drivers/gpio/gpio-74x164.c
++++ b/drivers/gpio/gpio-74x164.c
+@@ -109,10 +109,14 @@ static int gen_74x164_probe(struct spi_d
+ {
+ struct gen_74x164_chip *chip;
+ struct gen_74x164_chip_platform_data *pdata;
++ struct device_node *np;
+ int ret;
+
+- if (!spi->dev.of_node) {
+- dev_err(&spi->dev, "No device tree data available.\n");
++ pdata = spi->dev.platform_data;
++ np = spi->dev.of_node;
++
++ if (!np && !pdata) {
++ dev_err(&spi->dev, "No configuration data available.\n");
+ return -EINVAL;
+ }
+
+@@ -129,7 +133,6 @@ static int gen_74x164_probe(struct spi_d
+ if (!chip)
+ return -ENOMEM;
+
+- pdata = spi->dev.platform_data;
+ if (pdata && pdata->base)
+ chip->gpio_chip.base = pdata->base;
+ else
+@@ -146,12 +149,19 @@ static int gen_74x164_probe(struct spi_d
+ chip->gpio_chip.get = gen_74x164_get_value;
+ chip->gpio_chip.set = gen_74x164_set_value;
+
+- 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;
++ 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) {
+@@ -159,6 +169,9 @@ static int gen_74x164_probe(struct spi_d
+ goto exit_destroy;
+ }
+
++ if (pdata && pdata->init_data)
++ memcpy(chip->buffer, pdata->init_data, chip->registers);
++
+ chip->gpio_chip.can_sleep = 1;
+ chip->gpio_chip.dev = &spi->dev;
+ chip->gpio_chip.owner = THIS_MODULE;
+--- a/include/linux/spi/74x164.h
++++ b/include/linux/spi/74x164.h
+@@ -4,6 +4,10 @@
+ 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