linux-kernel - Re: [PATCH v5 0/5] i3c: Add basic HDR mode support

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Message-ID: <2025101319545551cfb399@mail.local>
Date: Mon, 13 Oct 2025 21:54:55 +0200
From: Alexandre Belloni <alexandre.belloni@...tlin.com>
To: Jonathan Cameron <jic23@...nel.org>
Cc: Frank Li <Frank.Li@....com>, Miquel Raynal <miquel.raynal@...tlin.com>,
	David Lechner <dlechner@...libre.com>,
	Nuno Sá <nuno.sa@...log.com>,
	Andy Shevchenko <andy@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, linux-i3c@...ts.infradead.org,
	linux-kernel@...r.kernel.org, imx@...ts.linux.dev,
	linux-iio@...r.kernel.org, joshua.yeong@...rfivetech.com,
	devicetree@...r.kernel.org, Carlos Song <carlos.song@....com>,
	Adrian Fluturel <fluturel.adrian@...il.com>
Subject: Re: [PATCH v5 0/5] i3c: Add basic HDR mode support

On 12/10/2025 18:03:27+0100, Jonathan Cameron wrote:
> On Tue, 07 Oct 2025 16:06:12 -0400
> Frank Li <Frank.Li@....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@....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