[U-Boot] [PATCH 7/8 V2] I2C: Add support for Multi channel

[Rajeshwari Birje]

Hi Joonyoung Shim,

Thank you for comments.

On Fri, Jun 15, 2012 at 12:45 PM, Joonyoung Shim <dofmind at gmail.com> wrote:
> Hi,
>
> 2012/6/7 Rajeshwari Shinde <rajeshwari.s at samsung.com>:
>> This adds multiple i2c channel support for I2C.
>>
>> Signed-off-by: Alim Akhtar <alim.akhtar at samsung.com>
>> Signed-off-by: Rajeshwari Shinde <rajeshwari.s at samsung.com>
>> Acked-by: Simon Glass <sjg at chromium.org>
>> ---
>>  drivers/i2c/s3c24x0_i2c.c |   27 +++++++++++++++++++++++++++
>>  1 files changed, 27 insertions(+), 0 deletions(-)
>>
>> diff --git a/drivers/i2c/s3c24x0_i2c.c b/drivers/i2c/s3c24x0_i2c.c
>> index a71f147..7521cb8 100644
>> --- a/drivers/i2c/s3c24x0_i2c.c
>> +++ b/drivers/i2c/s3c24x0_i2c.c
>> @@ -191,6 +191,33 @@ static void i2c_bus_init(struct s3c24x0_i2c *i2c, unsigned int bus)
>>        i2c_ch_init(i2c, CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
>>  }
>>
>> +/*
>> + * MULTI BUS I2C support
>> + */
>> +
>> +#ifdef CONFIG_I2C_MULTI_BUS
>> +int i2c_set_bus_num(unsigned int bus)
>> +{
>> +       struct s3c24x0_i2c *i2c;
>> +
>> +       if ((bus < 0) || (bus >= CONFIG_MAX_I2C_NUM)) {
>> +               debug("Bad bus: %d\n", bus);
>> +               return -1;
>> +       }
>> +
>> +       g_current_bus = bus;
>> +       i2c = get_base_i2c(g_current_bus);
>> +       i2c_bus_init(i2c, g_current_bus);
>
> This causes duplicated pin configuration whenever calls i2c_set_bus_num().
>
-- Initally we are initialising only for bus 0, When this function
gets called with bus id other than 0 we need to initialise that bus.
>> +
>> +       return 0;
>> +}
>> +
>> +unsigned int i2c_get_bus_num(void)
>> +{
>> +       return g_current_bus;
>> +}
>> +#endif
>
> Does only EXYNOS5 support CONFIG_I2C_MULTI_BUS?
-- EXYNOS4 also has Multi Bus I2C
>
>> +
>>  #ifdef CONFIG_EXYNOS5
>>  void i2c_init(int speed, int slaveadd)
>>  {
>> --
>> 1.7.4.4
>>
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>
> Thanks.
>
> --
> - Joonyoung Shim
> _______________________________________________
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Regards,
Rajeshwari Shinde.