On Fri, 27 Nov 2020, Vaittinen, Matti wrote: > Hello Lee, > > On Fri, 2020-11-27 at 08:32 +0000, Lee Jones wrote: > > On Mon, 23 Nov 2020, Matti Vaittinen wrote: > > > > > Add core support for ROHM BD9576MUF and BD9573MUF PMICs which are > > > mainly used to power the R-Car series processors. > > > > > > Signed-off-by: Matti Vaittinen <matti.vaittinen@xxxxxxxxxxxxxxxxx> > > > --- > > > drivers/mfd/Kconfig | 11 ++++ > > > drivers/mfd/Makefile | 1 + > > > drivers/mfd/rohm-bd9576.c | 108 > > > +++++++++++++++++++++++++++++++ > > > include/linux/mfd/rohm-bd957x.h | 59 +++++++++++++++++ > > > include/linux/mfd/rohm-generic.h | 2 + > > > 5 files changed, 181 insertions(+) > > > create mode 100644 drivers/mfd/rohm-bd9576.c > > > create mode 100644 include/linux/mfd/rohm-bd957x.h > > > > Looks like a possible candidate for "simple-mfd-i2c". > > > > Could you look into that please? > > > I must admit I didn't know about "simple-mfd-i2c". Good thing to know > when working with simple devices :) Is this a new thing? Yes, it's new. > I am unsure I understand the idea fully. Should users put all the > different regamp configs in this file and just add the device IDs with > pointer to correct config? (BD9576 and BD9573 need volatile ranges). > Also, does this mean each sub-device should have own node and own > compatible in DT to get correctly load and probed? I guess this would > need a buy-in from Rob too then. You should describe the H/W in DT. > By the way - for uneducated eyes like mine this does not look like it > has much to do with MFD as a device - here MFD reminds me of a simple- > bus on top of I2C. This is for MFD devices where the parent does little more than create a shared address space for child devices to operate on - like yours. > Anyways, the BD9576 and BD9573 both have a few interrupts for OVD/UVD > conditions and I am expecting that I will be asked to provide the > regulator notifiers for those. Reason why I omitted the IRQs for now is > that the HW is designed to keep the IRQ asserted for whole error > duration so some delayed ack mechanism would be needed. I would like to > keep the door open for adding IRQs to MFD core. You mean to add an IRQ Domain? -- Lee Jones [李琼斯] Senior Technical Lead - Developer Services Linaro.org │ Open source software for Arm SoCs Follow Linaro: Facebook | Twitter | Blog
