linux-kernel - Re: [linux-sunxi] Re: [PATCH 3/6] mfd: axp20x: Add support for RSB based AXP223 PMIC

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Date:	Mon, 19 Oct 2015 08:02:26 +0200
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Chen-Yu Tsai <wens@...e.org>
Cc:	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Hans de Goede <hdegoede@...hat.com>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	devicetree <devicetree@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [linux-sunxi] Re: [PATCH 3/6] mfd: axp20x: Add support for RSB
 based AXP223 PMIC

On Fri, Oct 16, 2015 at 02:46:23PM +0800, Chen-Yu Tsai wrote:
> On Fri, Oct 16, 2015 at 2:41 PM, Maxime Ripard
> <maxime.ripard@...e-electrons.com> wrote:
> > On Thu, Oct 15, 2015 at 12:32:19AM +0800, Chen-Yu Tsai wrote:
> >> The AXP223 is a new PMIC commonly paired with Allwinner A23/A33 SoCs.
> >> It is functionally identical to AXP221; only the regulator default
> >> voltage/status and the external host interface are different.
> >>
> >> Signed-off-by: Chen-Yu Tsai <wens@...e.org>
> >> ---
> >>  drivers/mfd/Kconfig        | 12 ++++++
> >>  drivers/mfd/Makefile       |  1 +
> >>  drivers/mfd/axp20x-core.c  |  2 +
> >>  drivers/mfd/axp20x-rsb.c   | 93 ++++++++++++++++++++++++++++++++++++++++++++++
> >>  include/linux/mfd/axp20x.h |  1 +
> >>  5 files changed, 109 insertions(+)
> >>  create mode 100644 drivers/mfd/axp20x-rsb.c
> >>
> >> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> >> index 9ba3feb3f2fc..6e5edb61d42e 100644
> >> --- a/drivers/mfd/Kconfig
> >> +++ b/drivers/mfd/Kconfig
> >> @@ -84,6 +84,7 @@ config MFD_BCM590XX
> >>  config MFD_AXP20X
> >>       bool "X-Powers AXP series PMICs"
> >>       select MFD_AXP20X_I2C
> >> +     select MFD_AXP20X_RSB
> >>
> >>  config MFD_AXP20X_CORE
> >>       bool
> >> @@ -102,6 +103,17 @@ config MFD_AXP20X_I2C
> >>         components like regulators or the PEK (Power Enable Key) under the
> >>         corresponding menus.
> >>
> >> +config MFD_AXP20X_RSB
> >> +     bool "X-Powers AXP series RSB PMICs"
> >> +     select MFD_AXP20X_CORE
> >> +     depends on SUNXI_RSB=y
> >
> > Do we need that? Even if the bus is compiled as a module, the driver
> > will not be probed before that, will it?
> 
> There's a compile/link dependency on the __devm_regmap_init_sunxi_rsb().

If it's exported, everything should be fine, no?

> And both drivers are bool, i.e. can't be compiled as a module. What we
> don't want is enabling MFD_AXP20X_RSB without SUNXI_RSB.

What would really be the issue here? The driver wouldn't be probed,
and that's it. Or am I missing something?

Maxime

> AFAIK the same goes for the I2C version.

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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