v4.19.13 snapshot.
diff --git a/drivers/mfd/sprd-sc27xx-spi.c b/drivers/mfd/sprd-sc27xx-spi.c
new file mode 100644
index 0000000..69df277
--- /dev/null
+++ b/drivers/mfd/sprd-sc27xx-spi.c
@@ -0,0 +1,263 @@
+/*
+ * Copyright (C) 2017 Spreadtrum Communications Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mfd/core.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include <linux/spi/spi.h>
+
+#define SPRD_PMIC_INT_MASK_STATUS 0x0
+#define SPRD_PMIC_INT_RAW_STATUS 0x4
+#define SPRD_PMIC_INT_EN 0x8
+
+#define SPRD_SC2731_IRQ_BASE 0x140
+#define SPRD_SC2731_IRQ_NUMS 16
+
+struct sprd_pmic {
+ struct regmap *regmap;
+ struct device *dev;
+ struct regmap_irq *irqs;
+ struct regmap_irq_chip irq_chip;
+ struct regmap_irq_chip_data *irq_data;
+ int irq;
+};
+
+struct sprd_pmic_data {
+ u32 irq_base;
+ u32 num_irqs;
+};
+
+/*
+ * Since different PMICs of SC27xx series can have different interrupt
+ * base address and irq number, we should save irq number and irq base
+ * in the device data structure.
+ */
+static const struct sprd_pmic_data sc2731_data = {
+ .irq_base = SPRD_SC2731_IRQ_BASE,
+ .num_irqs = SPRD_SC2731_IRQ_NUMS,
+};
+
+static const struct mfd_cell sprd_pmic_devs[] = {
+ {
+ .name = "sc27xx-wdt",
+ .of_compatible = "sprd,sc27xx-wdt",
+ }, {
+ .name = "sc27xx-rtc",
+ .of_compatible = "sprd,sc27xx-rtc",
+ }, {
+ .name = "sc27xx-charger",
+ .of_compatible = "sprd,sc27xx-charger",
+ }, {
+ .name = "sc27xx-chg-timer",
+ .of_compatible = "sprd,sc27xx-chg-timer",
+ }, {
+ .name = "sc27xx-fast-chg",
+ .of_compatible = "sprd,sc27xx-fast-chg",
+ }, {
+ .name = "sc27xx-chg-wdt",
+ .of_compatible = "sprd,sc27xx-chg-wdt",
+ }, {
+ .name = "sc27xx-typec",
+ .of_compatible = "sprd,sc27xx-typec",
+ }, {
+ .name = "sc27xx-flash",
+ .of_compatible = "sprd,sc27xx-flash",
+ }, {
+ .name = "sc27xx-eic",
+ .of_compatible = "sprd,sc27xx-eic",
+ }, {
+ .name = "sc27xx-efuse",
+ .of_compatible = "sprd,sc27xx-efuse",
+ }, {
+ .name = "sc27xx-thermal",
+ .of_compatible = "sprd,sc27xx-thermal",
+ }, {
+ .name = "sc27xx-adc",
+ .of_compatible = "sprd,sc27xx-adc",
+ }, {
+ .name = "sc27xx-audio-codec",
+ .of_compatible = "sprd,sc27xx-audio-codec",
+ }, {
+ .name = "sc27xx-regulator",
+ .of_compatible = "sprd,sc27xx-regulator",
+ }, {
+ .name = "sc27xx-vibrator",
+ .of_compatible = "sprd,sc27xx-vibrator",
+ }, {
+ .name = "sc27xx-keypad-led",
+ .of_compatible = "sprd,sc27xx-keypad-led",
+ }, {
+ .name = "sc27xx-bltc",
+ .of_compatible = "sprd,sc27xx-bltc",
+ }, {
+ .name = "sc27xx-fgu",
+ .of_compatible = "sprd,sc27xx-fgu",
+ }, {
+ .name = "sc27xx-7sreset",
+ .of_compatible = "sprd,sc27xx-7sreset",
+ }, {
+ .name = "sc27xx-poweroff",
+ .of_compatible = "sprd,sc27xx-poweroff",
+ }, {
+ .name = "sc27xx-syscon",
+ .of_compatible = "sprd,sc27xx-syscon",
+ },
+};
+
+static int sprd_pmic_spi_write(void *context, const void *data, size_t count)
+{
+ struct device *dev = context;
+ struct spi_device *spi = to_spi_device(dev);
+
+ return spi_write(spi, data, count);
+}
+
+static int sprd_pmic_spi_read(void *context,
+ const void *reg, size_t reg_size,
+ void *val, size_t val_size)
+{
+ struct device *dev = context;
+ struct spi_device *spi = to_spi_device(dev);
+ u32 rx_buf[2] = { 0 };
+ int ret;
+
+ /* Now we only support one PMIC register to read every time. */
+ if (reg_size != sizeof(u32) || val_size != sizeof(u32))
+ return -EINVAL;
+
+ /* Copy address to read from into first element of SPI buffer. */
+ memcpy(rx_buf, reg, sizeof(u32));
+ ret = spi_read(spi, rx_buf, 1);
+ if (ret < 0)
+ return ret;
+
+ memcpy(val, rx_buf, val_size);
+ return 0;
+}
+
+static struct regmap_bus sprd_pmic_regmap = {
+ .write = sprd_pmic_spi_write,
+ .read = sprd_pmic_spi_read,
+ .reg_format_endian_default = REGMAP_ENDIAN_NATIVE,
+ .val_format_endian_default = REGMAP_ENDIAN_NATIVE,
+};
+
+static const struct regmap_config sprd_pmic_config = {
+ .reg_bits = 32,
+ .val_bits = 32,
+ .reg_stride = 4,
+ .max_register = 0xffff,
+};
+
+static int sprd_pmic_probe(struct spi_device *spi)
+{
+ struct sprd_pmic *ddata;
+ const struct sprd_pmic_data *pdata;
+ int ret, i;
+
+ pdata = of_device_get_match_data(&spi->dev);
+ if (!pdata) {
+ dev_err(&spi->dev, "No matching driver data found\n");
+ return -EINVAL;
+ }
+
+ ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
+ if (!ddata)
+ return -ENOMEM;
+
+ ddata->regmap = devm_regmap_init(&spi->dev, &sprd_pmic_regmap,
+ &spi->dev, &sprd_pmic_config);
+ if (IS_ERR(ddata->regmap)) {
+ ret = PTR_ERR(ddata->regmap);
+ dev_err(&spi->dev, "Failed to allocate register map %d\n", ret);
+ return ret;
+ }
+
+ spi_set_drvdata(spi, ddata);
+ ddata->dev = &spi->dev;
+ ddata->irq = spi->irq;
+
+ ddata->irq_chip.name = dev_name(&spi->dev);
+ ddata->irq_chip.status_base =
+ pdata->irq_base + SPRD_PMIC_INT_MASK_STATUS;
+ ddata->irq_chip.mask_base = pdata->irq_base + SPRD_PMIC_INT_EN;
+ ddata->irq_chip.ack_base = 0;
+ ddata->irq_chip.num_regs = 1;
+ ddata->irq_chip.num_irqs = pdata->num_irqs;
+ ddata->irq_chip.mask_invert = true;
+
+ ddata->irqs = devm_kcalloc(&spi->dev,
+ pdata->num_irqs, sizeof(struct regmap_irq),
+ GFP_KERNEL);
+ if (!ddata->irqs)
+ return -ENOMEM;
+
+ ddata->irq_chip.irqs = ddata->irqs;
+ for (i = 0; i < pdata->num_irqs; i++) {
+ ddata->irqs[i].reg_offset = i / pdata->num_irqs;
+ ddata->irqs[i].mask = BIT(i % pdata->num_irqs);
+ }
+
+ ret = devm_regmap_add_irq_chip(&spi->dev, ddata->regmap, ddata->irq,
+ IRQF_ONESHOT | IRQF_NO_SUSPEND, 0,
+ &ddata->irq_chip, &ddata->irq_data);
+ if (ret) {
+ dev_err(&spi->dev, "Failed to add PMIC irq chip %d\n", ret);
+ return ret;
+ }
+
+ ret = devm_mfd_add_devices(&spi->dev, PLATFORM_DEVID_AUTO,
+ sprd_pmic_devs, ARRAY_SIZE(sprd_pmic_devs),
+ NULL, 0,
+ regmap_irq_get_domain(ddata->irq_data));
+ if (ret) {
+ dev_err(&spi->dev, "Failed to register device %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static const struct of_device_id sprd_pmic_match[] = {
+ { .compatible = "sprd,sc2731", .data = &sc2731_data },
+ {},
+};
+MODULE_DEVICE_TABLE(of, sprd_pmic_match);
+
+static struct spi_driver sprd_pmic_driver = {
+ .driver = {
+ .name = "sc27xx-pmic",
+ .bus = &spi_bus_type,
+ .of_match_table = sprd_pmic_match,
+ },
+ .probe = sprd_pmic_probe,
+};
+
+static int __init sprd_pmic_init(void)
+{
+ return spi_register_driver(&sprd_pmic_driver);
+}
+subsys_initcall(sprd_pmic_init);
+
+static void __exit sprd_pmic_exit(void)
+{
+ spi_unregister_driver(&sprd_pmic_driver);
+}
+module_exit(sprd_pmic_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Spreadtrum SC27xx PMICs driver");
+MODULE_AUTHOR("Baolin Wang <baolin.wang@spreadtrum.com>");