On Tue, Oct 20, 2015 at 2:48 AM, Maxime Ripard <maxime.rip...@free-electrons.com> wrote: > On Mon, Oct 19, 2015 at 02:20:29PM +0800, Chen-Yu Tsai wrote: >> On Mon, Oct 19, 2015 at 2:02 PM, Maxime Ripard >> <maxime.rip...@free-electrons.com> wrote: >> > 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.rip...@free-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 <w...@csie.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? >> >> The RSB bus / slave device functions have been merged into the RSB driver >> itself. Enabling MFD_AXP20X_RSB without enabling SUNXI_RSB means that RSB >> bus/device related functions are not compiled, i.e. link error: >> >> drivers/built-in.o: In function `axp20x_rsb_probe': >> /home/wens/sunxi/linux/drivers/mfd/axp20x-rsb.c:64: undefined >> reference to `__devm_regmap_init_sunxi_rsb' >> drivers/built-in.o: In function `axp20x_rsb_driver_init': >> /home/wens/sunxi/linux/drivers/mfd/axp20x-rsb.c:89: undefined >> reference to `sunxi_rsb_driver_register' >> Makefile:927: recipe for target 'vmlinux' failed >> >> The dependency is like "depends on I2C=y" for the I2C version. >> >> If you're asking about why "=y", I guess it's because MFD_AXP20X_RSB is bool, >> and if the depended on symbol is a tristate, which it actually is for I2c, >> we'd want it to be compiled in, and not built as a module, or again we'd get >> a undefined reference link error. > > Yeah, but my point was more why not have both the RSB driver and MFD > as a module? The part where RSB is a module and the driver is > statically built doesn't make sense (and I don't think a depends on > allow that), but having both make sense.
Ok. I have no problem with building them as modules. I was just following what the original driver did. It seems half the mfd driver can be built as modules, while the other half can only be built-in. I don't know what the criteria is here. >> Would it make sense to have SUNXI_RSB as a tristate symbol, i.e. can be built >> as a module? I'm nore sure. For multi-platform kernels, probably? Currently >> it >> isn't. > > Yes, it's better for multi-platform / distro kernels. I guess I'll do a follow up patch for sunxi-rsb? Regards ChenYu -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
