On 12/10/2025 18:03:27+0100, Jonathan Cameron wrote:

On Tue, 07 Oct 2025 16:06:12 -0400
Frank Li [off-list ref] wrote:

quoted

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@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