Hi,
this is something I wanted to do for a long time...
First of all: sorry for the cross domain series. I did tested alone all the domain patches and they are not causing any regression. When they come together we will have ability to control the pdmclk needed by McPDM.
CLK patches: The driver was w/o DT support and needed some cleanup so we can use the driver. I have also renamed it to twl6040-pdmclk from twl6040-clk to be precise.
MFD patches: The regmap_sync() was not working since the twl6040 does not support bulk access and now we are going to create the needed child for the pdmclk.
ARM patches: Updatding the board DTS files and add the needed lines for the pdmclk.
ASoC patches: The machine driver needs to select the twl6040-clk driver as it will be used by the omap-mcpdm. I needed to do some cleanup and add also suspend/resume support before adding the code for pdmclk handling since I don't want to keep the twl6040 powered on when the board is suspended. At the moment it is not possible to do true dynamic twl6040 power up/down due to pop noises, but I will be looking at that later. The driver in the future will fail if it is not able to get the pdmclk to avoid kernel crash (McPDM registers are not accessible when pdmclk is not available).
I have tested the patches by domain and also in all (I hope) permutation they could be. I have not experienced any regression.
Regards, Peter --- Peter Ujfalusi (14): clk: twl6040: Correct clk_ops clk: twl6040: Register the clock as of_clk_provider clk: twl6040: Rename the driver and use consistent names in the code mfd: twl6040: The chip does not support bulk access mfd: twl6040: Register child device for twl6040-pdmclk ARM: dts: omap5-board-common: Add pdmclk binding for audio ARM: dts: omap4-panda-common: Add pdmclk binding for audio ARM: dts: omap4-sdp: Add pdmclk binding for audio ARM: dts: omap4-var-som-om44: Add pdmclk binding for audio ARM: dts: omap4-duovero: Add pdmclk binding for audio ASoC: omap: Kconfig: SND_OMAP_SOC_OMAP_ABE_TWL6040 to select CLK_TWL6040 ASoC: omap-mcpdm: Move the WD enable write inside omap_mcpdm_open_streams() ASoC: omap-mcpdm: Support for suspend resume ASoC: omap-mcpdm: Add support for pdmclk clock handling
Documentation/devicetree/bindings/mfd/twl6040.txt | 1 + .../devicetree/bindings/sound/omap-mcpdm.txt | 10 +++ arch/arm/boot/dts/omap4-duovero.dtsi | 5 ++ arch/arm/boot/dts/omap4-panda-common.dtsi | 5 ++ arch/arm/boot/dts/omap4-sdp.dts | 5 ++ arch/arm/boot/dts/omap4-var-som-om44.dtsi | 5 ++ arch/arm/boot/dts/omap5-board-common.dtsi | 5 ++ drivers/clk/clk-twl6040.c | 80 +++++++++++++--------- drivers/mfd/twl6040.c | 6 ++ include/linux/mfd/twl6040.h | 2 +- sound/soc/omap/Kconfig | 1 + sound/soc/omap/omap-mcpdm.c | 74 ++++++++++++++++++-- 12 files changed, 160 insertions(+), 39 deletions(-)