[PATCH v5 0/5] i3c: Add basic HDR mode support

[Alexandre Belloni]

On 12/10/2025 18:03:27+0100, Jonathan Cameron wrote:
> On Tue, 07 Oct 2025 16:06:12 -0400
> Frank Li <Frank.Li at nxp.com> wrote:
> 
> > Add basic HDR mode support, only support private transfer, not support
> > CCC command.
> > 
> > Update i3c framework API to allow pass down mode and extend driver callback
> > function.
> > 
> > Implement HDR transfer in svc i3c master driver.
> > 
> > Simplifed HDR flow is (ref i3c spec line 5514) Figure 129
> > 
> > <--              SDR            ---> | <--- HDR
> > START 0x7E RnW(0) ACK CCC(ENTHDR0) T   HDR-CMD(00-7f write, 80--ff read)
> > 
> >                                     ----> |  
> > HDR-DATA HDR-CRC HDR-RESTART .... HDR-EXIT
> > 
> > Note: HDR-CMD is 16bit data, which included 7bit slave address and 8bit
> > read/write command.
> > 
> > svc hardware can auto issue SDR part.
> > 
> > Signed-off-by: Frank Li <Frank.Li at nxp.com>
> 
> Whilst there will probably have to be a v6 for the ACPI ID issue in patch 5,
> I'd like to ask the question of how are we planning to merge this?
> 
> Maybe an immutable branch either in IIO or I3C trees that the other one picks up?
> 
> It's a new driver so could gamble on taking the IIO driver the I3C tree but even
> then I'd like a topic / immutable branch in case any IIO wide refactors or similar
> hit this cycle.
> 

I can definitively provide an immutable branch once this goes in or if
you are more comfortable with this, I guess there is no urgency and we
could apply this over two cycles, first the I3C part and then you can
take the driver.


-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com