linux-kernel - RE: [PATCH v7 5/8] i3c: target: add svc target controller support

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Date: Wed, 6 Mar 2024 18:10:30 +0000
From: Joshua Yeong <joshua.yeong@...rfivetech.com>
To: Frank Li <Frank.li@....com>
CC: "alexandre.belloni@...tlin.com" <alexandre.belloni@...tlin.com>,
	"conor.culhane@...vaco.com" <conor.culhane@...vaco.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"ilpo.jarvinen@...ux.intel.com" <ilpo.jarvinen@...ux.intel.com>,
	"imx@...ts.linux.dev" <imx@...ts.linux.dev>, "jirislaby@...nel.org"
	<jirislaby@...nel.org>, "joe@...ches.com" <joe@...ches.com>,
	"krzysztof.kozlowski+dt@...aro.org" <krzysztof.kozlowski+dt@...aro.org>,
	"krzysztof.kozlowski@...aro.org" <krzysztof.kozlowski@...aro.org>,
	"linux-i3c@...ts.infradead.org" <linux-i3c@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
	"miquel.raynal@...tlin.com" <miquel.raynal@...tlin.com>, "robh@...nel.org"
	<robh@...nel.org>, "zbigniew.lukwinski@...ux.intel.com"
	<zbigniew.lukwinski@...ux.intel.com>
Subject: RE: [PATCH v7 5/8] i3c: target: add svc target controller support


> -----Original Message-----
> From: Frank Li <Frank.li@....com>
> Sent: Thursday, March 7, 2024 1:45 AM
> To: Joshua Yeong <joshua.yeong@...rfivetech.com>
> Cc: alexandre.belloni@...tlin.com; conor.culhane@...vaco.com;
> devicetree@...r.kernel.org; gregkh@...uxfoundation.org;
> ilpo.jarvinen@...ux.intel.com; imx@...ts.linux.dev; jirislaby@...nel.org;
> joe@...ches.com; krzysztof.kozlowski+dt@...aro.org;
> krzysztof.kozlowski@...aro.org; linux-i3c@...ts.infradead.org; linux-
> kernel@...r.kernel.org; linux-serial@...r.kernel.org;
> miquel.raynal@...tlin.com; robh@...nel.org;
> zbigniew.lukwinski@...ux.intel.com
> Subject: Re: [PATCH v7 5/8] i3c: target: add svc target controller support
> 
> On Wed, Mar 06, 2024 at 04:01:17PM +0000, Joshua Yeong wrote:
> > Hi Frank,
> >
> > > -----Original Message-----
> > > From: linux-i3c <linux-i3c-bounces@...ts.infradead.org> On Behalf Of
> > > Frank Li
> > > Sent: Tuesday, February 6, 2024 7:33 AM
> > > To: frank.li@....com
> > > Cc: alexandre.belloni@...tlin.com; conor.culhane@...vaco.com;
> > > devicetree@...r.kernel.org; gregkh@...uxfoundation.org;
> > > ilpo.jarvinen@...ux.intel.com; imx@...ts.linux.dev;
> > > jirislaby@...nel.org; joe@...ches.com;
> > > krzysztof.kozlowski+dt@...aro.org;
> > > krzysztof.kozlowski@...aro.org; linux-i3c@...ts.infradead.org;
> > > linux- kernel@...r.kernel.org; linux-serial@...r.kernel.org;
> > > miquel.raynal@...tlin.com; robh@...nel.org;
> > > zbigniew.lukwinski@...ux.intel.com
> > > Subject: [PATCH v7 5/8] i3c: target: add svc target controller
> > > support
> > >
> > > Add Silvaco I3C target controller support
> > >
> > > Signed-off-by: Frank Li <Frank.Li@....com>
> > > ---
> > >
> > > Notes:
> > >     Change from v2 to v3
> > >     - fix build warning
> > >
> > >  drivers/i3c/master/Makefile         |   2 +-
> > >  drivers/i3c/master/svc-i3c-main.c   |  35 +-
> > >  drivers/i3c/master/svc-i3c-target.c | 776
> >
> > I think putting target mode files under "master" might not make sense.
> > We might have to consider that we may have a "secondary master" mode.
> > Some other ways of splitting or handling of target mode is needed here.
> 
> I think name 'master' is not good here. Previously only support 'master'
> mode, it should be fine. Now many controller are dual mode.
> 
> And I3C spec use 'controller/target' instead of 'master/slave'. I think
> 'controller' as master are quite confused. It can be master controller and slave
> controller.
> 
> Anyway, slave/master may share some code and resource, even only one file.
> 
> So far, I think it is fine put under master now. we can rename 'master'
> later when more dual mode controller added.
> 
> Frank

I am currently working on secondary-controller mode. I would like to explore if 
we can have a different way to implement various modes.

I am guessing that the current inspiration is coming from the existing i2c 
framework. 

However, I am thinking of having a more generic function to replace the way how 
we register the i3c driver. (existing 'i3c_master_register' or 
'devm_i3c_target_ctrl_create' from yours) Maybe along the line where we can have
all the modes set in a struct and return to the i3c framework. So we only need 1
API to register all the different modes instead of having one each.

> 
> >
> > ...
> >
> > > +
> > > +#define I3C_SCONFIG	0x4
> > > +#define   I3C_SCONFIG_SLVENA_MASK	BIT(0)
> > > +#define	  I3C_SCONFIG_OFFLINE_MASK	BIT(9)
> > > +#define   I3C_SCONFIG_SADDR_MASK	GENMASK(31, 25)
> > > +
> > > +#define I3C_SSTATUS	0x8
> > > +#define	  I3C_SSTATUS_STNOTSTOP_MASK	BIT(0)
> > > +#define	  I3C_SSTATUS_STOP_MASK		BIT(10)
> > > +#define	  I3C_SSTATUS_RX_PEND_MASK	BIT(11)
> > > +#define   I3C_SSTATUS_TXNOTFULL_MASK	BIT(12)
> > > +#define	  I3C_SSTATUS_DACHG_MASK	BIT(13)
> > > +#define	  I3C_SSTATUS_EVDET_MASK	GENMASK(21, 20)
> > > +#define	  I3C_SSTATUS_EVDET_ACKED	0x3
> > > +#define	  I3C_SSTATUS_IBIDIS_MASK	BIT(24)
> > > +#define	  I3C_SSTATUS_HJDIS_MASK	BIT(27)
> > > +
> >
> > There is couple of space formatting here that requires to be fixed.
> >
> > Cheers,
> > Joshua