--- zzzz-none-000/linux-3.10.107/drivers/gpio/gpio-74x164.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/drivers/gpio/gpio-74x164.c	2021-02-04 17:41:59.000000000 +0000
@@ -21,7 +21,6 @@
 #define GEN_74X164_NUMBER_GPIOS	8
 
 struct gen_74x164_chip {
-	struct spi_device	*spi;
 	u8			*buffer;
 	struct gpio_chip	gpio_chip;
 	struct mutex		lock;
@@ -35,6 +34,7 @@
 
 static int __gen_74x164_write_config(struct gen_74x164_chip *chip)
 {
+	struct spi_device *spi = to_spi_device(chip->gpio_chip.dev);
 	struct spi_message message;
 	struct spi_transfer *msg_buf;
 	int i, ret = 0;
@@ -55,12 +55,12 @@
 	 * byte of the buffer will end up in the last register.
 	 */
 	for (i = chip->registers - 1; i >= 0; i--) {
-		msg_buf[i].tx_buf = chip->buffer +i;
+		msg_buf[i].tx_buf = chip->buffer + i;
 		msg_buf[i].len = sizeof(u8);
 		spi_message_add_tail(msg_buf + i, &message);
 	}
 
-	ret = spi_sync(chip->spi, &message);
+	ret = spi_sync(spi, &message);
 
 	kfree(msg_buf);
 
@@ -109,10 +109,14 @@
 {
 	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;
 	}
 
@@ -129,40 +133,42 @@
 	if (!chip)
 		return -ENOMEM;
 
-	pdata = spi->dev.platform_data;
-	if (pdata && pdata->base)
-		chip->gpio_chip.base = pdata->base;
-	else
-		chip->gpio_chip.base = -1;
-
-	mutex_init(&chip->lock);
-
 	spi_set_drvdata(spi, chip);
 
-	chip->spi = spi;
-
 	chip->gpio_chip.label = spi->modalias;
 	chip->gpio_chip.direction_output = gen_74x164_direction_output;
 	chip->gpio_chip.get = gen_74x164_get_value;
 	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");
-		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->gpio_chip.base = pdata->base;
+		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) {
-		ret = -ENOMEM;
-		goto exit_destroy;
-	}
+	if (!chip->buffer)
+		return -ENOMEM;
+
+	if (pdata && pdata->init_data)
+		memcpy(chip->buffer, pdata->init_data, chip->registers);
 
-	chip->gpio_chip.can_sleep = 1;
+	chip->gpio_chip.can_sleep = true;
 	chip->gpio_chip.dev = &spi->dev;
 	chip->gpio_chip.owner = THIS_MODULE;
 
+	mutex_init(&chip->lock);
+
 	ret = __gen_74x164_write_config(chip);
 	if (ret) {
 		dev_err(&spi->dev, "Failed writing: %d\n", ret);
@@ -170,48 +176,36 @@
 	}
 
 	ret = gpiochip_add(&chip->gpio_chip);
-	if (ret)
-		goto exit_destroy;
-
-	return ret;
+	if (!ret)
+		return 0;
 
 exit_destroy:
-	spi_set_drvdata(spi, NULL);
 	mutex_destroy(&chip->lock);
+
 	return ret;
 }
 
 static int gen_74x164_remove(struct spi_device *spi)
 {
-	struct gen_74x164_chip *chip;
-	int ret;
-
-	chip = spi_get_drvdata(spi);
-	if (chip == NULL)
-		return -ENODEV;
+	struct gen_74x164_chip *chip = spi_get_drvdata(spi);
 
-	spi_set_drvdata(spi, NULL);
-
-	ret = gpiochip_remove(&chip->gpio_chip);
-	if (!ret)
-		mutex_destroy(&chip->lock);
-	else
-		dev_err(&spi->dev, "Failed to remove the GPIO controller: %d\n",
-				ret);
+	gpiochip_remove(&chip->gpio_chip);
+	mutex_destroy(&chip->lock);
 
-	return ret;
+	return 0;
 }
 
+#ifdef CONFIG_OF
 static const struct of_device_id gen_74x164_dt_ids[] = {
 	{ .compatible = "fairchild,74hc595" },
 	{},
 };
 MODULE_DEVICE_TABLE(of, gen_74x164_dt_ids);
+#endif
 
 static struct spi_driver gen_74x164_driver = {
 	.driver = {
 		.name		= "74x164",
-		.owner		= THIS_MODULE,
 		.of_match_table	= of_match_ptr(gen_74x164_dt_ids),
 	},
 	.probe		= gen_74x164_probe,