On Mon, 13 Jun 2022 19:11:39 +0800
ChiaEn Wu <peterwu.pub@xxxxxxxxx> wrote:
> From: ChiYuan Huang <cy_huang@xxxxxxxxxxx>
>
> Add Mediatek MT6370 MFD support.
>
> Signed-off-by: ChiYuan Huang <cy_huang@xxxxxxxxxxx>
Hi.
A few trivial things that probably overlap with other reviewer
comments.
> +static int mt6370_check_vendor_info(struct mt6370_info *info)
> +{
> + unsigned int devinfo;
> + int ret;
> +
> + ret = regmap_read(info->regmap, MT6370_REG_DEV_INFO, &devinfo);
> + if (ret)
> + return ret;
> +
> + switch (FIELD_GET(MT6370_VENID_MASK, devinfo)) {
> + case 0x8: /* RT5081 */
> + case 0xA: /* RT5081A */
> + case 0xE: /* MT6370 */
> + case 0xF: /* MT6371 */
> + case 0x9: /* MT6372P */
> + case 0xB: /* MT6372CP */
> + break;
> + default:
> + dev_err(info->dev, "Not invalid value 0x%02x\n", devinfo);
Double negative... You mean "Invalid value"
though you probably want to say something more specific such as
"Unknown Vendor ID 0x%02x\n")
> + return -ENODEV;
> + }
> +
> + return 0;
> +}
> +
> +static int mt6370_regmap_read(void *context, const void *reg_buf,
> + size_t reg_size, void *val_buf, size_t val_size)
> +{
> + struct mt6370_info *info = context;
> + u8 bank_idx = *(u8 *)reg_buf, bank_addr = *(u8 *)(reg_buf + 1);
> + int ret;
> +
> + ret = i2c_smbus_read_i2c_block_data(info->i2c[bank_idx], bank_addr,
> + val_size, val_buf);
> + if (ret != val_size)
> + return ret;
If it's positive , that is probably not what regmap expects.
See handling in here
https://elixir.bootlin.com/linux/latest/source/drivers/base/regmap/regmap-i2c.c#L222
> +
> + return 0;
> +}
> +
> +static int mt6370_probe(struct i2c_client *i2c)
> +{
> + struct mt6370_info *info;
> + struct i2c_client *usbc_i2c;
> + int ret;
> +
> + info = devm_kzalloc(&i2c->dev, sizeof(*info), GFP_KERNEL);
> + if (!info)
> + return -ENOMEM;
> +
> + info->dev = &i2c->dev;
> +
> + usbc_i2c = devm_i2c_new_dummy_device(&i2c->dev, i2c->adapter,
> + MT6370_USBC_I2CADDR);
> + if (IS_ERR(usbc_i2c)) {
> + ret = PTR_ERR(usbc_i2c);
> + dev_err(&i2c->dev, "Failed to register usbc i2c client %d\n", ret);
Might as well use
return dev_err_probe(&i2c->dev, PTR_ERR(usb_i2c),
"Failed to register USBC I2C client\n");
Whilst the defer handling isn't relevant, it is safe to use throughout probe
and tidier in this case at least.
> + return ret;
> + }
> +
> + /* Assign I2C client for PMU and TypeC */
> + info->i2c[MT6370_PMU_I2C] = i2c;
> + info->i2c[MT6370_USBC_I2C] = usbc_i2c;
> +
> + info->regmap = devm_regmap_init(&i2c->dev, &mt6370_regmap_bus, info,
> + &mt6370_regmap_config);
> + if (IS_ERR(info->regmap)) {
> + ret = PTR_ERR(info->regmap);
> + dev_err(&i2c->dev, "Failed to register regmap (%d)\n", ret);
as above dev_err_probe() will tidy this and following cases up for you.
> + return ret;
> + }
> +
> + ret = mt6370_check_vendor_info(info);
> + if (ret) {
> + dev_err(&i2c->dev, "Failed to check vendor info (%d)\n", ret);
> + return ret;
> + }
> +
> + ret = devm_regmap_add_irq_chip(&i2c->dev, info->regmap, i2c->irq,
> + IRQF_ONESHOT, -1, &mt6370_irq_chip,
> + &info->irq_data);
> + if (ret) {
> + dev_err(&i2c->dev, "Failed to add irq chip (%d)\n", ret);
> + return ret;
> + }
> +
> + return devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO,
> + mt6370_devices, ARRAY_SIZE(mt6370_devices),
> + NULL, 0,
> + regmap_irq_get_domain(info->irq_data));
> +}
