[PATCH v9 1/4] mfd: Add Rockchip rk817 audio CODEC support

[Chris Morgan]

On Mon, May 10, 2021 at 05:23:29PM +0100, Lee Jones wrote:
> On Wed, 05 May 2021, Chris Morgan wrote:
> 
> > From: Chris Morgan <macromorgan at hotmail.com>
> > 
> > Add rk817 codec support cell to rk808 mfd driver.
> > 
> > Tested-by: Maciej Matuszczyk <maccraft123mc at gmail.com>
> > Signed-off-by: Chris Morgan <macromorgan at hotmail.com>
> 
> Nit: These should be chronological.

Acknowledged. I will make sure to do this if a v10 is necessary.

> 
> > ---
> > Changes in v9:
> >  - Add cover letter.
> >  - Remove documentation for interrupt parent per Rob Herring's request.
> >  - Remove unused MODULE_DEVICE_TABLE to fix a bug identified by kernel test
> >    robot.
> > Changes in v8:
> >  - Added additional documentation for missing properties of #sound-dai-cells,
> >    interrupt-parent, and wakeup-source for mfd documentation.
> >  - Corrected order of elements descriptions in device tree documentation.
> >  - Changed name of "mic-in-differential" to "rockchip,mic-in-differential".
> >  - Changed name of sound card from "rockchip,rk817-codec" to "Analog".
> >  - Removed unused resets and reset-names from the i2s1_2ch node.
> > Changes in v7:
> >  - Removed ifdef around register definitions for MFD.
> >  - Replaced codec documentation with updates to MFD documentation.
> >  - Reordered elements in example to comply with upstream rules.
> >  - Added binding update back for Odroid Go Advance as requested.
> >  - Submitting patches from gmail now.
> > Changes in v6:
> >  - Included additional project maintainers for correct subsystems.
> >  - Removed unneeded compatible from DT documentation.
> >  - Removed binding update for Odroid Go Advance (will do in seperate series).
> > Changes in v5:
> >  - Move register definitions from rk817_codec.h to main rk808.h register
> >    definitions.
> >  - Add volatile register for codec bits.
> >  - Add default values for codec bits.
> >  - Removed of_compatible from mtd driver (not necessary).
> >  - Switched to using parent regmap instead of private regmap for codec.
> > Changes in v4:
> >  - Created set_pll() call.
> >  - Created user visible gain control in mic.
> >  - Check for return value of clk_prepare_enable().
> >  - Removed duplicate clk_prepare_enable().
> >  - Split DT documentation to separate commit.
> > Changes in v3:
> >  - Use DAPM macros to set audio path.
> >  - Updated devicetree binding (as every rk817 has this codec chip).
> >  - Changed documentation to yaml format.
> >  - Split MFD changes to separate commit.
> > Changes in v2:
> >  - Fixed audio path registers to solve some bugs.
> > 
> >  drivers/mfd/rk808.c       | 85 +++++++++++++++++++++++++++++++++++++++
> >  include/linux/mfd/rk808.h | 81 +++++++++++++++++++++++++++++++++++++
> >  2 files changed, 166 insertions(+)
> > 
> > diff --git a/drivers/mfd/rk808.c b/drivers/mfd/rk808.c
> > index ad923dd4e007..9231209184e0 100644
> > --- a/drivers/mfd/rk808.c
> > +++ b/drivers/mfd/rk808.c
> > @@ -65,6 +65,7 @@ static bool rk817_is_volatile_reg(struct device *dev, unsigned int reg)
> >  	switch (reg) {
> >  	case RK817_SECONDS_REG ... RK817_WEEKS_REG:
> >  	case RK817_RTC_STATUS_REG:
> > +	case RK817_CODEC_DTOP_LPT_SRST:
> >  	case RK817_INT_STS_REG0:
> >  	case RK817_INT_STS_REG1:
> >  	case RK817_INT_STS_REG2:
> > @@ -163,6 +164,11 @@ static const struct mfd_cell rk817s[] = {
> >  		.num_resources = ARRAY_SIZE(rk817_rtc_resources),
> >  		.resources = &rk817_rtc_resources[0],
> >  	},
> > +#ifdef CONFIG_SND_SOC_RK817
> > +	{
> > +		.name = "rk817-codec",
> > +	},
> > +#endif
> 
> No #ifery please.
> 
> Just replace it with a comment.
> 
> If no associated driver exists, it just won't match/bind.

I did the "if" here because I noticed that if I have a rk817 and do not
utilize the codec I receive a dmesg warning. I put the if here to silence
it in the event that someone was using this PMIC but didn't want to use
the audio codec. I will make the change if you say so though, but I just
want to confirm that it's acceptable to have a warning for all rk817s
that do not use the codec about a missing codec.  The hardware is always
present, I just can't say for certain it will always be used.

Thank you.

> 
> -- 
> Lee Jones [李琼斯]
> Senior Technical Lead - Developer Services
> Linaro.org │ Open source software for Arm SoCs
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