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SubjectRe: [PATCH 2/2] mfd: Add Spreadtrum SC27xx series PMICs driver
On Wed, 11 Oct 2017, Baolin Wang wrote:

> This patch adds support for Spreadtrum SC27xx series PMIC MFD core, and It
> provides communication through the SPI interfaces. The SC27xx series PMICs
> contains the following 6 major components:
> - DCDCs
> - LDOs
> - Battery management system
> - Audio codec
> - User interface function, such as indicator, flash LED
> - IC level function, such as power on/off, type-c
>
> Signed-off-by: Baolin Wang <baolin.wang@spreadtrum.com>
> ---
> drivers/mfd/Kconfig | 10 ++
> drivers/mfd/Makefile | 1 +
> drivers/mfd/sprd-sc27xx-spi.c | 273 +++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 284 insertions(+)
> create mode 100644 drivers/mfd/sprd-sc27xx-spi.c
>
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index fc5e4fe..4753cd5 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -1057,6 +1057,16 @@ config MFD_SMSC
> To compile this driver as a module, choose M here: the
> module will be called smsc.
>
> +config MFD_SC27XX_PMIC
> + tristate "Spreadtrum SC27xx PMICs"
> + depends on ARCH_SPRD || COMPILE_TEST
> + depends on SPI_MASTER
> + select MFD_CORE
> + select REGMAP_SPI
> + select REGMAP_IRQ
> + help
> + This enables support for the Spreadtrum SC27xx PMICs.
> +
> config ABX500_CORE
> bool "ST-Ericsson ABX500 Mixed Signal Circuit register functions"
> default y if ARCH_U300 || ARCH_U8500 || COMPILE_TEST
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index c3d0a1b..a377e0f 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -226,3 +226,4 @@ obj-$(CONFIG_MFD_SUN4I_GPADC) += sun4i-gpadc.o
> obj-$(CONFIG_MFD_STM32_LPTIMER) += stm32-lptimer.o
> obj-$(CONFIG_MFD_STM32_TIMERS) += stm32-timers.o
> obj-$(CONFIG_MFD_MXS_LRADC) += mxs-lradc.o
> +obj-$(CONFIG_MFD_SC27XX_PMIC) += sprd-sc27xx-spi.o
> diff --git a/drivers/mfd/sprd-sc27xx-spi.c b/drivers/mfd/sprd-sc27xx-spi.c
> new file mode 100644
> index 0000000..2b3f2bc
> --- /dev/null
> +++ b/drivers/mfd/sprd-sc27xx-spi.c
> @@ -0,0 +1,273 @@
> +/*
> + * 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/spi/spi.h>
> +#include <linux/regmap.h>

Alphabetical.

> +#define SPRD_PMIC_INT_MASK_STATUS 0x0
> +#define SPRD_PMIC_INT_RAW_STATU 0x4
> +#define SPRD_PMIC_INT_EN 0x8
> +
> +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;
> +};
> +
> +static const struct sprd_pmic_data sc2731_data = {
> + .irq_base = 0x140,
> + .num_irqs = 16,
> +};
> +
> +static const struct mfd_cell sprd_pmic_devs[] = {
> + {
> + .name = "sc27xx-wdt",
> + .of_compatible = "sprd,sc27xx-wdt",
> + },
> + {

Nit: You can save a few lines here by using the format:

> + }, {

> + .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",
> + },
> +};
> +
> +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;
> +
> + rx_buf[0] = *(u32 *)reg;
> + ret = spi_read(spi, rx_buf, 1);
> + if (ret < 0)
> + return ret;
> +
> + memcpy(val, rx_buf, val_size);

This looks like you're asking for trouble.

What if val_size > sizeof(rx_buf)?

You should probably check for that.

> + 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 *sprd_pmic;
> + const struct sprd_pmic_data *data;
> + int ret, i;
> +
> + data = of_device_get_match_data(&spi->dev);
> + if (!data) {
> + dev_err(&spi->dev, "No matching driver data found\n");
> + return -EINVAL;
> + }
> +
> + sprd_pmic = devm_kzalloc(&spi->dev, sizeof(*sprd_pmic), GFP_KERNEL);
> + if (!sprd_pmic)
> + return -ENOMEM;
> +
> + sprd_pmic->regmap = devm_regmap_init(&spi->dev, &sprd_pmic_regmap,
> + &spi->dev, &sprd_pmic_config);
> + if (IS_ERR(sprd_pmic->regmap)) {
> + ret = PTR_ERR(sprd_pmic->regmap);
> + dev_err(&spi->dev, "Failed to allocate register map %d\n", ret);
> + return ret;
> + }
> +
> + spi_set_drvdata(spi, sprd_pmic);
> + sprd_pmic->dev = &spi->dev;
> + sprd_pmic->irq = spi->irq;
> +
> + sprd_pmic->irq_chip.name = dev_name(&spi->dev);
> + sprd_pmic->irq_chip.status_base =
> + data->irq_base + SPRD_PMIC_INT_MASK_STATUS;
> + sprd_pmic->irq_chip.mask_base = data->irq_base + SPRD_PMIC_INT_EN;
> + sprd_pmic->irq_chip.ack_base = 0;
> + sprd_pmic->irq_chip.num_regs = 1;
> + sprd_pmic->irq_chip.num_irqs = data->num_irqs;
> + sprd_pmic->irq_chip.mask_invert = true;
> +
> + sprd_pmic->irqs = devm_kzalloc(&spi->dev, sizeof(struct regmap_irq) *
> + data->num_irqs, GFP_KERNEL);
> + if (!sprd_pmic->irqs)
> + return -ENOMEM;
> +
> + sprd_pmic->irq_chip.irqs = sprd_pmic->irqs;
> + for (i = 0; i < data->num_irqs; i++) {
> + sprd_pmic->irqs[i].reg_offset = i / data->num_irqs;
> + sprd_pmic->irqs[i].mask = BIT(i % data->num_irqs);
> + }

Why don't you do this live, instead of pre-calculating?

> + ret = devm_regmap_add_irq_chip(&spi->dev, sprd_pmic->regmap,
> + sprd_pmic->irq,
> + IRQF_ONESHOT | IRQF_NO_SUSPEND, 0,
> + &sprd_pmic->irq_chip,
> + &sprd_pmic->irq_data);
> + if (ret) {
> + dev_err(&spi->dev, "Failed to add PMIC irq chip %d\n", ret);
> + return ret;
> + }
> +
> + ret = mfd_add_devices(&spi->dev, PLATFORM_DEVID_AUTO, sprd_pmic_devs,
> + ARRAY_SIZE(sprd_pmic_devs), NULL, 0,
> + regmap_irq_get_domain(sprd_pmic->irq_data));
> + if (ret) {
> + dev_err(&spi->dev, "Failed to register device %d\n", ret);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int sprd_pmic_remove(struct spi_device *spi)
> +{
> + mfd_remove_devices(&spi->dev);

'\n' here please.

> + 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,

Odd tabbing here. Should be 8 chars.

> + },
> + .probe = sprd_pmic_probe,
> + .remove = sprd_pmic_remove,
> +};
> +
> +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("SPI support for SC27xx PMICs");
> +MODULE_AUTHOR("Baolin Wang <baolin.wang@spreadtrum.com>");

--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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