[U-Boot,2/2] i2c:gpio:s5p: I2C GPIO Software implementation (via soft_i2c)

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Cc: Minkyu Kang <mk7.kang@samsung.com>
---
 arch/arm/include/asm/arch-s5pc1xx/gpio.h |    2 +
 board/samsung/goni/goni.c                |   55 +++++++++++++++++++++++++++++-
 include/configs/s5p_goni.h               |   13 +++++++
 3 files changed, 69 insertions(+), 1 deletions(-)

Dear Lukasz Majewski,

On 11 July 2011 17:18, Lukasz Majewski <l.majewski@samsung.com> wrote:
> Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
> Cc: Minkyu Kang <mk7.kang@samsung.com>
> ---
>  arch/arm/include/asm/arch-s5pc1xx/gpio.h |    2 +
>  board/samsung/goni/goni.c                |   55 +++++++++++++++++++++++++++++-
>  include/configs/s5p_goni.h               |   13 +++++++
>  3 files changed, 69 insertions(+), 1 deletions(-)

You missing commit message.

>
> diff --git a/arch/arm/include/asm/arch-s5pc1xx/gpio.h b/arch/arm/include/asm/arch-s5pc1xx/gpio.h
> index 903de9c..108fb64 100644
> --- a/arch/arm/include/asm/arch-s5pc1xx/gpio.h
> +++ b/arch/arm/include/asm/arch-s5pc1xx/gpio.h
> @@ -155,4 +155,6 @@ void s5p_gpio_set_rate(struct s5p_gpio_bank *bank, int gpio, int mode);
>  #define GPIO_DRV_FAST  0x0
>  #define GPIO_DRV_SLOW  0x1
>
> +/* GPIO pins per bank  */
> +#define GPIO_PER_BANK 8
>  #endif
> diff --git a/board/samsung/goni/goni.c b/board/samsung/goni/goni.c
> index e24cd29..dbbd7ed 100644
> --- a/board/samsung/goni/goni.c
> +++ b/board/samsung/goni/goni.c
> @@ -1,7 +1,8 @@
>  /*
> - *  Copyright (C) 2008-2009 Samsung Electronics
> + *  Copyright (C) 2008-2011 Samsung Electronics
>  *  Minkyu Kang <mk7.kang@samsung.com>
>  *  Kyungmin Park <kyungmin.park@samsung.com>
> + *  Lukasz Majewski <l.majewski@samsung.com>
>  *
>  * See file CREDITS for list of people who contributed to this
>  * project.
> @@ -96,3 +97,55 @@ int board_mmc_init(bd_t *bis)
>        return s5p_mmc_init(0, 4);
>  }
>  #endif
> +
> +#ifdef CONFIG_SOFT_I2C
> +
> +enum { I2C_PMIC, I2C_NUM, };

What purpose of these enum?
Where these used?

> +
> +void i2c_init_board(void) {}
> +
> +int s5p_gpio_get_nr(void *gp_ptr, int gpio)
> +{
> +       unsigned int offset = gp_ptr - (void *) s5pc110_gpio;
> +       offset /= sizeof(struct s5p_gpio_bank);
> +
> +       return (offset * GPIO_PER_BANK) + gpio;
> +}
> +
> +struct s5p_gpio_bank *s5p_gpio_get_bank(int nr)
> +{
> +       int bank = nr / GPIO_PER_BANK;
> +       bank *= sizeof(struct s5p_gpio_bank);
> +
> +       return (struct s5p_gpio_bank *) ((void *) s5pc110_gpio + bank);
> +}
> +
> +inline int s5p_gpio_get_pin(int nr)
> +{
> +       return nr % GPIO_PER_BANK;
> +}
> +
> +inline int gpio_direction_input(int nr)
> +{
> +       s5p_gpio_direction_input(s5p_gpio_get_bank(nr),
> +                                s5p_gpio_get_pin(nr));
> +}
> +
> +inline int gpio_direction_output(int nr, int value)
> +{
> +       s5p_gpio_direction_output(s5p_gpio_get_bank(nr),
> +                                 s5p_gpio_get_pin(nr), value);
> +}
> +
> +inline int gpio_get_value(int nr)
> +{
> +       return (int) s5p_gpio_get_value(s5p_gpio_get_bank(nr),
> +                                       s5p_gpio_get_pin(nr));
> +}
> +
> +inline void gpio_set_value(int nr, int value)
> +{
> +       s5p_gpio_set_value(s5p_gpio_get_bank(nr),
> +                          s5p_gpio_get_pin(nr), value);
> +}
> +#endif

I think It's not a board specific.
Please make common file for I2C gpio for s5p.

> diff --git a/include/configs/s5p_goni.h b/include/configs/s5p_goni.h
> index 010428b..ee87927 100644
> --- a/include/configs/s5p_goni.h
> +++ b/include/configs/s5p_goni.h
> @@ -224,4 +224,17 @@
>
>  #define CONFIG_SYS_INIT_SP_ADDR        (CONFIG_SYS_LOAD_ADDR - 0x1000000)
>
> +#include <asm/arch/gpio.h>
> +/*
> + * I2C Settings
> + */
> +#define S5PC110_GPIO_J3        (S5PC110_GPIO_BASE + 0x2C0)
> +#define CONFIG_SOFT_I2C_GPIO_SCL s5p_gpio_get_nr(S5PC110_GPIO_J3, 3)
> +#define CONFIG_SOFT_I2C_GPIO_SDA s5p_gpio_get_nr(S5PC110_GPIO_J3, 0)

I have one question.
How we can handle multiple bus?
I mean.. how we can change SCL and SDA?

> +
> +#define CONFIG_SOFT_I2C                1
> +#define CONFIG_SYS_I2C_INIT_BOARD
> +#define CONFIG_SYS_I2C_SPEED   50000
> +#define CONFIG_I2C_MULTI_BUS
> +#define CONFIG_SYS_MAX_I2C_BUS 7
>  #endif /* __CONFIG_H */
> --
> 1.7.2.3

Thanks
Minkyu Kang

Hi Minkyu,

> > +
> > +#ifdef CONFIG_SOFT_I2C
> > +
> > +enum { I2C_PMIC, I2C_NUM, };  
> 
> What purpose of these enum?
> Where these used?

For now goni reference target is going to use only one I2C bus
(implemented as soft_i2c GPIO). Therefore this enum will be erased for
v2. In the future, however this might be needed.

> > +#define S5PC110_GPIO_J3        (S5PC110_GPIO_BASE + 0x2C0)
> > +#define CONFIG_SOFT_I2C_GPIO_SCL s5p_gpio_get_nr(S5PC110_GPIO_J3,
> > 3) +#define CONFIG_SOFT_I2C_GPIO_SDA
> > s5p_gpio_get_nr(S5PC110_GPIO_J3, 0)  
> 
> I have one question.
> How we can handle multiple bus?
> I mean.. how we can change SCL and SDA?

I've asked this question to Heiko Schocher already.
Please refer to this reply:

http://lists.denx.de/pipermail/u-boot/2011-July/095610.html