[U-Boot] [PATCH V3] i2c: mxc: refactor i2c driver and support dm

[Heiko Schocher]

Hello Simon,

Am 13.05.2015 03:44, schrieb Simon Glass:
> Hi,
>
> On 12 May 2015 at 19:09, Fan Peng <Peng.Fan at freescale.com> wrote:
>>
>> Hi,
>>
>> Is there any further comments? Or this patch will be applied?
>>
>
> I can apply it if you like - Heiko what do you prefer?

Yes, please. Thanks.

bye,
Heiko
>
> - Simon
>
>> Regards,
>> Peng.
>>
>> -----Original Message-----
>> From: sjg at google.com [mailto:sjg at google.com] On Behalf Of Simon Glass
>> Sent: Wednesday, May 06, 2015 4:56 AM
>> To: Fan Peng-B51431
>> Cc: Stefano Babic; Heiko Schocher; Marek Vašut; Nikita Kiryanov; U-Boot Mailing List
>> Subject: Re: [PATCH V3] i2c: mxc: refactor i2c driver and support dm
>>
>> On 27 April 2015 at 07:36, Peng Fan <Peng.Fan at freescale.com> wrote:
>>>
>>> 1. Introduce a new structure `struct mxc_i2c_bus`, this structure will
>>>     used for non-DM and DM.
>>> 2. Remove `struct mxc_i2c_regs` structure, but use register offset to access
>>>     registers based on `base` entry of `struct mxc_i2c_bus`.
>>> 3. Remove most `#ifdef I2C_QUIRK_REG`. Using driver_data to contain platform
>>>     flags. A new flag is introduced, I2C_QUIRK_FLAG.
>>> 4. Most functions use `struct mxc_i2c_bus` as one of the parameters.
>>>     Make most functions common to DM and non-DM, try to avoid duplicated code.
>>> 5. Support DM. Pinmux setting is still set by setup_i2c, but we do not
>>>     need bus_i2c_init for DM.
>>> 6. struct i2c_parms and struct sram_data are removed.
>>> 7. Remove bus_i2c_read bus_i2c_write prototype in header file. The frist
>>>     paramter of bus_i2c_init is modified to i2c index. Add new prototype
>>>     i2c_idle_bus and force_idle_bus. Since bus_i2c_init is not good for
>>>     DM I2C and pinctrl is missed, we use a weak function for i2c_idle_bus
>>>     for DM part.
>>>     Board file take the responsibility to implement this function, like this:
>>>     "
>>>     int i2c_idle_bus(struct mxc_i2c_bus *i2c_bus)
>>>     {
>>>             if (i2c_bus->index == 0)
>>>                     force_idle_bus(i2c_pads_info0);
>>>             else if (i2c_bus->index == 1)
>>>                     force_idle_bus(i2c_pads_info1);
>>>             else
>>>                     xxxxxx
>>>     }
>>>     "
>>>
>>> Signed-off-by: Peng Fan <Peng.Fan at freescale.com>
>>> ---
>>>
>>> Changes v3:
>>>   1. remove bus_i2c_init for DM, introuduce a weak function i2c_idle_bus.
>>>   2. remove static return type for force_idle_bus, since we need to call
>>>      it in i2c_idle_bus which may be implemented in board file. This does
>>>      not hurt for non-DM.
>>
>> Acked-by: Simon Glass <sjg at chromium.org>
>>
>>>
>>> Changes v2:
>>>   1. Refactor driver, remove register access based on structure, but use
>>>     'base + offset'
>>>   2. Introduce mxc_i2c_bus structure
>>>   3. Introduce I2C_QUIRK_FLAG and remove most I2C_QUIRK_REG and use
>>>      driver_data to contain the flags for different platforms  4. Avoid
>>> duplicated code between DM and non-DM part  5. The function name
>>> i2c_init_transfer is not changed.
>>>   6. Remove bus_i2c_read/write prototype from header file  7. change
>>> bus_i2c_init's first parameter to i2c index  8. Rename patch name,
>>> since refactor non-DM part.
>>>
>>>   arch/arm/imx-common/i2c-mxv7.c            |   7 +-
>>>   arch/arm/include/asm/imx-common/mxc_i2c.h |  38 +-
>>>   drivers/i2c/mxc_i2c.c                     | 575 ++++++++++++++++++++----------
>>>   3 files changed, 426 insertions(+), 194 deletions(-)
>>>
>

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