[PATCH 3/6] reset: hisilicon: add reset-hi3660

[zhangfei]

Hi, Arnd

On 2016年11月22日 16:50, Arnd Bergmann wrote:
> On Tuesday, November 22, 2016 3:49:18 PM CET Zhangfei Gao wrote:
>> +static const struct hisi_reset_channel_data hi3660_iomcu_rst[] = {
>> +       [HI3660_RST_I2C0] = HISI_RST_SEP(0x20, 3),
>> +       [HI3660_RST_I2C1] = HISI_RST_SEP(0x20, 4),
>> +       [HI3660_RST_I2C2] = HISI_RST_SEP(0x20, 5),
>> +       [HI3660_RST_I2C6] = HISI_RST_SEP(0x20, 27),
>> +};
>> +
>> +static struct hisi_reset_controller_data hi3660_iomcu_controller = {
>> +       .nr_channels = ARRAY_SIZE(hi3660_iomcu_rst),
>> +       .channels = hi3660_iomcu_rst,
>> +};
>> +
>> +static const struct hisi_reset_channel_data hi3660_crgctrl_rst[] = {
>> +       [HI3660_RST_I2C3] = HISI_RST_SEP(0x78, 7),
>> +       [HI3660_RST_I2C4] = HISI_RST_SEP(0x78, 27),
>> +       [HI3660_RST_I2C7] = HISI_RST_SEP(0x60, 14),
>> +       [HI3660_RST_SD] = HISI_RST_SEP(0x90, 18),
>> +       [HI3660_RST_SDIO] = HISI_RST_SEP(0x90, 20),
>> +       [HI3660_RST_UFS] = HISI_RST_SEP(0x84, 12),
>> +       [HI3660_RST_UFS_ASSERT] = HISI_RST_SEP(0x84, 7),
>> +       [HI3660_RST_PCIE_SYS] = HISI_RST_SEP(0x84, 26),
>> +       [HI3660_RST_PCIE_PHY] = HISI_RST_SEP(0x84, 27),
>> +       [HI3660_RST_PCIE_BUS] = HISI_RST_SEP(0x84, 31),
>> +       [HI3660_RST_USB3OTG_PHY] = HISI_RST_SEP(0x90, 3),
>> +       [HI3660_RST_USB3OTG] = HISI_RST_SEP(0x90, 5),
>> +       [HI3660_RST_USB3OTG_32K] = HISI_RST_SEP(0x90, 6),
>> +       [HI3660_RST_USB3OTG_AHB] = HISI_RST_SEP(0x90, 7),
>> +       [HI3660_RST_USB3OTG_MUX] = HISI_RST_SEP(0x90, 8),
>> +};
> I think you can avoid the trap of the ABI incompatibility if
> you just define those as in the binding as tuples, using #reset-cells=2.
>
> In particular for the first set, it seems really silly to redefine
> the numbers when there is just a simple integer number.

Could you clarify more, still not understand.
The number is index of the arrays, and the index will be used in dts.
The arrays lists the registers offset and bit shift.
For example:

[HI3660_RST_I2C0] = HISI_RST_SEP(0x20, 3), means register offset : 0x20, and bit shift = 3.

And Documentation/devicetree/bindings/reset/reset.txt
Required properties:
#reset-cells:   Number of cells in a reset specifier; Typically 0 for nodes
                 with a single reset output and 1 for nodes with multiple
                 reset outputs.

Thanks