[U-Boot] [PATCH v2 04/21] vybrid: clock: Provide enable_i2c_clk() function for Vybrid

[Lukasz Majewski <lukma@denx.de>]

Hi Stefan,

> On 01.02.2019 15:19, Lukasz Majewski wrote:
> > Hi Stefan,
> >   
> >> On 20.01.2019 14:34, Lukasz Majewski wrote:  
> >> > Provide function to enable I2C2 clock for vf610 (BK4) - in the
> >> > generic code.  
> >>
> >> Can you split this in two commits, one adding enable_i2c_clk and
> >> the second removing board specific clock enable?  
> > 
> > This particular commit only adds new clock to generic driver.  
> 
> No, this commit also touches board/phytec/pcm052/pcm052.c.
> 
> > 
> > There is a commit latter, which is removing the board file:
> > [PATCH v2 15/21] pcm052: board: Remove in-board setup code (it is
> > now replaced by DM setup)
> > 
> > The approach as is is optimal - I do not see any build errors for
> > separate patches.
> >   
> >>
> >> Also our module seems to use I2C0, could you add that instance to
> >> the supported instances too? It should be rather trivial:
> >>
> >>
> >> 	switch (i2c_num) {
> >> 	case 0:
> >> 		clrsetbits_le32(&ccm->ccgr4,
> >> CCM_CCGR4_I2C0_CTRL_MASK, CCM_CCGR4_I2C0_CTRL_MASK);  
> > 
> > The problem is that this change is not related to BK4/PCM052 ... or
> > "our module" is a PCM052?
> > 
> > If this is some custom board / module (not pcm052) then I would
> > prefer to have this change as a separate (not related to this patch
> > set) patch.  
> 
> You are touching common code. So far enable_i2c_clk was a weak
> function which returned 1. If a board calls that function with
> i2c_num other than 2, the new platform specific enable_i2c_clk will
> return -EINVAL... Hence this breaks boards which do not use instance
> 2...
> 

Thanks for pointing this out explicitly. There is indeed a weak
function. I will add the code as you suggested.

> I am not asking to update other board files. Simply making the common
> code to work for all (known) cases.

Ok.

> 
> --
> Stefan
> 
> >   
> >> ...
> >>
> >>
> >> --
> >> Stefan
> >>  
> >> >
> >> > Signed-off-by: Lukasz Majewski <lukma@denx.de>
> >> > ---
> >> >
> >> > Changes in v2: None
> >> >
> >> >  arch/arm/cpu/armv7/vf610/generic.c      | 19 +++++++++++++++++++
> >> >  arch/arm/include/asm/arch-vf610/clock.h |  3 +++
> >> >  board/phytec/pcm052/pcm052.c            |  2 +-
> >> >  3 files changed, 23 insertions(+), 1 deletion(-)
> >> >
> >> > diff --git a/arch/arm/cpu/armv7/vf610/generic.c
> >> > b/arch/arm/cpu/armv7/vf610/generic.c
> >> > index cbd3391918..f1e6c7816e 100644
> >> > --- a/arch/arm/cpu/armv7/vf610/generic.c
> >> > +++ b/arch/arm/cpu/armv7/vf610/generic.c
> >> > @@ -375,3 +375,22 @@ void enable_caches(void)
> >> >  	mmu_set_region_dcache_behaviour(IRAM_BASE_ADDR,
> >> > IRAM_SIZE, option); }
> >> >  #endif
> >> > +
> >> > +#ifdef CONFIG_SYS_I2C_MXC
> >> > +/* i2c_num can be from 0 - 3 */
> >> > +int enable_i2c_clk(unsigned char enable, unsigned int i2c_num)
> >> > +{
> >> > +	struct ccm_reg *ccm = (struct ccm_reg *)CCM_BASE_ADDR;
> >> > +
> >> > +	switch (i2c_num) {
> >> > +	case 2:
> >> > +		clrsetbits_le32(&ccm->ccgr10,
> >> > CCM_CCGR10_I2C2_CTRL_MASK,
> >> > +				CCM_CCGR10_I2C2_CTRL_MASK);
> >> > +		break;
> >> > +	default:
> >> > +		return -EINVAL;
> >> > +	}
> >> > +
> >> > +	return 0;
> >> > +}
> >> > +#endif
> >> > diff --git a/arch/arm/include/asm/arch-vf610/clock.h
> >> > b/arch/arm/include/asm/arch-vf610/clock.h
> >> > index 3bd73a01f3..72184fd608 100644
> >> > --- a/arch/arm/include/asm/arch-vf610/clock.h
> >> > +++ b/arch/arm/include/asm/arch-vf610/clock.h
> >> > @@ -22,6 +22,9 @@ enum mxc_clock {
> >> >  void enable_ocotp_clk(unsigned char enable);
> >> >  unsigned int mxc_get_clock(enum mxc_clock clk);
> >> >  u32 get_lpuart_clk(void);
> >> > +#ifdef CONFIG_SYS_I2C_MXC
> >> > +int enable_i2c_clk(unsigned char enable, unsigned int i2c_num);
> >> > +#endif
> >> >
> >> >  #define imx_get_fecclk() mxc_get_clock(MXC_FEC_CLK)
> >> >
> >> > diff --git a/board/phytec/pcm052/pcm052.c
> >> > b/board/phytec/pcm052/pcm052.c index f988af2abc..cfc8009102
> >> > 100644 --- a/board/phytec/pcm052/pcm052.c
> >> > +++ b/board/phytec/pcm052/pcm052.c
> >> > @@ -485,7 +485,7 @@ static void clock_init(void)
> >> >  	clrsetbits_le32(&ccm->ccgr9, CCM_REG_CTRL_MASK,
> >> >  			CCM_CCGR9_FEC0_CTRL_MASK |
> >> > CCM_CCGR9_FEC1_CTRL_MASK); clrsetbits_le32(&ccm->ccgr10,
> >> > CCM_REG_CTRL_MASK,
> >> > -			CCM_CCGR10_NFC_CTRL_MASK |
> >> > CCM_CCGR10_I2C2_CTRL_MASK);
> >> > +			CCM_CCGR10_NFC_CTRL_MASK);
> >> >
> >> >  	clrsetbits_le32(&anadig->pll2_ctrl,
> >> > ANADIG_PLL2_CTRL_POWERDOWN, ANADIG_PLL2_CTRL_ENABLE |
> >> > ANADIG_PLL2_CTRL_DIV_SELECT);  
> > 
> > 
> > 
> > 
> > Best regards,
> > 
> > Lukasz Majewski
> > 
> > --
> > 
> > DENX Software Engineering GmbH,      Managing Director: Wolfgang
> > Denk HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell,
> > Germany Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email:
> > lukma at denx.de  




Best regards,

Lukasz Majewski

--

DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: lukma at denx.de
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