RE: [PATCH 1/3] sunxi: board: simplify early PMIC setup conditions

["Jaehoon Chung" <jh80.chung@samsung.com>]

Hi,

> -----Original Message-----
> From: Andre Przywara <andre.przywara@arm.com>
> Sent: Sunday, October 22, 2023 6:19 AM
> To: Jernej Škrabec <jernej.skrabec@gmail.com>
> Cc: Jagan Teki <jagan@amarulasolutions.com>; Jaehoon Chung <jh80.chung@samsung.com>; Samuel Holland
> <samuel@sholland.org>; SASANO Takayoshi <uaa@mx5.nisiq.net>; Mikhail Kalashnikov <iuncuim@gmail.com>;
> Piotr Oniszczuk <piotr.oniszczuk@gmail.com>; u-boot@lists.denx.de; linux-sunxi@lists.linux.dev
> Subject: Re: [PATCH 1/3] sunxi: board: simplify early PMIC setup conditions
> 
> On Sat, 21 Oct 2023 08:34:06 +0200
> Jernej Škrabec <jernej.skrabec@gmail.com> wrote:
> 
> > On Wednesday, October 18, 2023 5:50:12 PM CEST Andre Przywara wrote:
> > > So far we have a convoluted #ifdef mesh that guards the early AXP PMIC
> > > setup in board.c. That combination of &&, || and negations is very hard
> > > to read, maintain and especially to extend.
> > >
> > > Fortunately we have those same conditions already modelled in the
> > > Kconfig file, so they are actually redundant. On top of that the real
> > > reason we have those preprocessor guards in the first place is about the
> > > symbols that are *conditionally* defined: without #ifdefs the build
> > > would break because of them being undefined for many boards.
> > >
> > > To simplify this, just change the guards to actually look at the symbols
> > > needed, so CONFIG_AXP_xxx_VOLT instead of CONFIG_AXPyyy_POWER.
> > > This drastically improves the readability of this code, and makes adding
> > > PMIC support a pure Kconfig matter.
> > >
> > > Signed-off-by: Andre Przywara <andre.przywara@arm.com>
> > > ---
> > >  board/sunxi/board.c   | 32 ++++++++++++++------------------
> > >  drivers/power/Kconfig |  2 +-
> > >  2 files changed, 15 insertions(+), 19 deletions(-)
> > >
> > > diff --git a/board/sunxi/board.c b/board/sunxi/board.c
> > > index ebaa9431984..65d79a02c25 100644
> > > --- a/board/sunxi/board.c
> > > +++ b/board/sunxi/board.c
> > > @@ -597,50 +597,46 @@ void sunxi_board_init(void)
> > >  		}
> > >  	}
> > >
> > > -#if defined CONFIG_AXP221_POWER || defined CONFIG_AXP809_POWER || \
> > > -	defined CONFIG_AXP818_POWER
> > > +#ifdef CONFIG_AXP_DCDC1_VOLT
> > >  	power_failed |= axp_set_dcdc1(CONFIG_AXP_DCDC1_VOLT);
> > > +	power_failed |= axp_set_dcdc5(CONFIG_AXP_DCDC5_VOLT);
> > >  #endif
> > > -#if !defined(CONFIG_AXP305_POWER)
> > > +#ifdef CONFIG_AXP_DCDC2_VOLT
> > >  	power_failed |= axp_set_dcdc2(CONFIG_AXP_DCDC2_VOLT);
> > >  	power_failed |= axp_set_dcdc3(CONFIG_AXP_DCDC3_VOLT);
> > >  #endif
> > > -#if !defined(CONFIG_AXP209_POWER) && !defined(CONFIG_AXP818_POWER)
> > > +#ifdef CONFIG_AXP_DCDC4_VOLT
> > >  	power_failed |= axp_set_dcdc4(CONFIG_AXP_DCDC4_VOLT);
> > >  #endif
> > > -#if defined CONFIG_AXP221_POWER || defined CONFIG_AXP809_POWER || \
> > > -	defined CONFIG_AXP818_POWER
> > > -	power_failed |= axp_set_dcdc5(CONFIG_AXP_DCDC5_VOLT);
> > > -#endif
> > >
> > > -#if defined CONFIG_AXP221_POWER || defined CONFIG_AXP809_POWER || \
> > > -	defined CONFIG_AXP818_POWER
> > > +#ifdef CONFIG_AXP_ALDO1_VOLT
> > >  	power_failed |= axp_set_aldo1(CONFIG_AXP_ALDO1_VOLT);
> > >  #endif
> > > -#if !defined(CONFIG_AXP305_POWER)
> > > +#ifdef CONFIG_AXP_ALDO2_VOLT
> > >  	power_failed |= axp_set_aldo2(CONFIG_AXP_ALDO2_VOLT);
> > >  #endif
> > > -#if !defined(CONFIG_AXP152_POWER) && !defined(CONFIG_AXP305_POWER)
> > > +#ifdef CONFIG_AXP_ALDO3_VOLT
> > >  	power_failed |= axp_set_aldo3(CONFIG_AXP_ALDO3_VOLT);
> > >  #endif
> > > -#ifdef CONFIG_AXP209_POWER
> > > +#ifdef CONFIG_AXP_ALDO4_VOLT
> > >  	power_failed |= axp_set_aldo4(CONFIG_AXP_ALDO4_VOLT);
> > >  #endif
> > >
> > > -#if defined(CONFIG_AXP221_POWER) || defined(CONFIG_AXP809_POWER) || \
> > > -	defined(CONFIG_AXP818_POWER)
> > > +#ifdef CONFIG_AXP_DLDO1_VOLT
> > >  	power_failed |= axp_set_dldo(1, CONFIG_AXP_DLDO1_VOLT);
> > >  	power_failed |= axp_set_dldo(2, CONFIG_AXP_DLDO2_VOLT);
> > > -#if !defined CONFIG_AXP809_POWER
> > > +#endif
> > > +#ifdef CONFIG_AXP_DLDO3_VOLT
> > >  	power_failed |= axp_set_dldo(3, CONFIG_AXP_DLDO3_VOLT);
> > >  	power_failed |= axp_set_dldo(4, CONFIG_AXP_DLDO4_VOLT);
> > >  #endif
> > > +#ifdef CONFIG_AXP_ELDO1_VOLT
> > >  	power_failed |= axp_set_eldo(1, CONFIG_AXP_ELDO1_VOLT);
> > >  	power_failed |= axp_set_eldo(2, CONFIG_AXP_ELDO2_VOLT);
> > >  	power_failed |= axp_set_eldo(3, CONFIG_AXP_ELDO3_VOLT);
> > >  #endif
> > >
> > > -#ifdef CONFIG_AXP818_POWER
> > > +#ifdef CONFIG_AXP_FLDO1_VOLT
> > >  	power_failed |= axp_set_fldo(1, CONFIG_AXP_FLDO1_VOLT);
> > >  	power_failed |= axp_set_fldo(2, CONFIG_AXP_FLDO2_VOLT);
> > >  	power_failed |= axp_set_fldo(3, CONFIG_AXP_FLDO3_VOLT);
> > > @@ -649,7 +645,7 @@ void sunxi_board_init(void)
> > >  #if defined CONFIG_AXP809_POWER || defined CONFIG_AXP818_POWER
> > >  	power_failed |= axp_set_sw(IS_ENABLED(CONFIG_AXP_SW_ON));
> > >  #endif
> > > -#endif
> > > +#endif	/* CONFIG_AXPxxx_POWER */
> > >  	printf("DRAM:");
> > >  	gd->ram_size = sunxi_dram_init();
> > >  	printf(" %d MiB\n", (int)(gd->ram_size >> 20));
> > > diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
> > > index 7f3b990d231..83cb31c937a 100644
> > > --- a/drivers/power/Kconfig
> > > +++ b/drivers/power/Kconfig
> > > @@ -180,7 +180,7 @@ config AXP_DCDC3_VOLT
> > >
> > >  config AXP_DCDC4_VOLT
> > >  	int "axp pmic dcdc4 voltage"
> > > -	depends on AXP152_POWER || AXP221_POWER || AXP809_POWER ||
> > AXP818_POWER ||
> > > AXP305_POWER +	depends on AXP152_POWER || AXP221_POWER || AXP809_POWER
> > ||
> > > AXP305_POWER default 1250 if AXP152_POWER
> > >  	default 1200 if MACH_SUN6I
> > >  	default 0 if MACH_SUN8I
> >
> > This patch is great, but this last change doesn't seem to be directly
> > connected?
> 
> It is an existing bug: there is no axp_set_dcdc4() for the AXP818, but
> since the AXP818 is not included in the guards at the calling site
> in board.c above, we didn't notice.
> So without this change, all A83T boards (the only ones using AXP818)
> would fail compilation.
> I just forgot to mention it in the commit message, will add it.

Will you resend this patch after updating the commit message?

Best Regards,
Jaehoon Chung

> 
> Cheers,
> Andre