[linux-sunxi] [PATCH 10/17] sunxi: add support for R_I2C on H616

["Jernej Škrabec" <jernej.skrabec@siol.net>]

Dne ponedeljek, 04. januar 2021 ob 03:33:12 CET je Samuel Holland napisal(a):
> On 1/3/21 3:26 AM, Jernej Skrabec wrote:
> > This port is needed for communication with PMIC. SPL uses it to set DRAM
> > voltage on H616 boards.
> > 
> > Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
> > ---
> > 
> >  arch/arm/include/asm/arch-sunxi/gpio.h | 1 +
> >  board/sunxi/board.c                    | 4 ++++
> >  2 files changed, 5 insertions(+)
> > 
> > diff --git a/arch/arm/include/asm/arch-sunxi/gpio.h
> > b/arch/arm/include/asm/arch-sunxi/gpio.h index cdb7dbd5b8e5..de77bf638e21
> > 100644
> > --- a/arch/arm/include/asm/arch-sunxi/gpio.h
> > +++ b/arch/arm/include/asm/arch-sunxi/gpio.h
> > @@ -220,6 +220,7 @@ enum sunxi_gpio_number {
> > 
> >  #define SUN8I_A23_GPL_R_TWI	3
> >  #define SUN8I_GPL_R_UART	2
> >  #define SUN50I_GPL_R_TWI	2
> > 
> > +#define SUN50I_H616_GPL_R_TWI	3
> 
> The fact that I2C is at function 3 makes me suspicious that there is RSB
> at function 2. Have you checked if that is the case?

BSP Linux pinctrl has function 2 s_rsb0, so yes, that should be the case. 
However, it doesn't have RSB DT node anywhere. Datasheet mentions RSB only in 
CCU diagram, so no details anywhere. I didn't test it.

Best regards,
Jernej

> 
> Either way:
> 
> Reviewed-by: Samuel Holland <samuel@sholland.org>
> 
> >  #define SUN9I_GPN_R_RSB		3
> > 
> > diff --git a/board/sunxi/board.c b/board/sunxi/board.c
> > index 54ff9bc92396..727e8320318f 100644
> > --- a/board/sunxi/board.c
> > +++ b/board/sunxi/board.c
> > @@ -196,6 +196,10 @@ void i2c_init_board(void)
> > 
> >  	clock_twi_onoff(5, 1);
> >  	sunxi_gpio_set_cfgpin(SUNXI_GPL(8), SUN50I_GPL_R_TWI);
> >  	sunxi_gpio_set_cfgpin(SUNXI_GPL(9), SUN50I_GPL_R_TWI);
> > 
> > +#elif CONFIG_MACH_SUN50I_H616
> > +	clock_twi_onoff(5, 1);
> > +	sunxi_gpio_set_cfgpin(SUNXI_GPL(0), SUN50I_H616_GPL_R_TWI);
> > +	sunxi_gpio_set_cfgpin(SUNXI_GPL(1), SUN50I_H616_GPL_R_TWI);
> > 
> >  #else
> >  
> >  	clock_twi_onoff(5, 1);
> >  	sunxi_gpio_set_cfgpin(SUNXI_GPL(0), SUN8I_H3_GPL_R_TWI);