linux-kernel - RE: [PATCH] typec: tcpm: Provide of_node pointer as part of psy

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Date:   Mon, 21 May 2018 13:58:16 +0000
From:   Adam Thomson <Adam.Thomson.Opensource@...semi.com>
To:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Adam Thomson <Adam.Thomson.Opensource@...semi.com>
CC:     Guenter Roeck <linux@...ck-us.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Support Opensource <Support.Opensource@...semi.com>
Subject: RE: [PATCH] typec: tcpm: Provide of_node pointer as part of psy_cfg

Hi Heikki,

On 21 May 2018 14:20, Heikki Krogerus wrote:

> On Wed, May 16, 2018 at 05:00:46PM +0100, Adam Thomson wrote:
> > For supply registration, provide of_node pointer of the port device,
> > via the power_supply_config structure, to allow other psy drivers
> > to add us as a supplier using the 'power-supplies' DT property.
> >
> > Signed-off-by: Adam Thomson <Adam.Thomson.Opensource@...semi.com>
> > ---
> >  drivers/usb/typec/tcpm.c | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/usb/typec/tcpm.c b/drivers/usb/typec/tcpm.c
> > index 72996cc..e7c0b95 100644
> > --- a/drivers/usb/typec/tcpm.c
> > +++ b/drivers/usb/typec/tcpm.c
> > @@ -4500,6 +4500,7 @@ static int devm_tcpm_psy_register(struct tcpm_port
> *port)
> >  	char *psy_name;
> >
> >  	psy_cfg.drv_data = port;
> > +	psy_cfg.of_node = port->dev->of_node;
> >  	psy_name = devm_kzalloc(port->dev, psy_name_len, GFP_KERNEL);
> >  	if (!psy_name)
> >  		return -ENOMEM;
> 
> Would it be possible to use fwnode here instead? It would mean that
> you add a member for it to the struct power_supply_config, and handle
> it separately in power_supply_core.c. You could just convert it to
> of_node there for now.
> 
> That is just a request, I'm fine with this, but it would prepare this
> driver for all types of platforms, so less patching would be needed
> once we add ACPI support to the power_supply_core.c.

Would the following commit from Hans, already present in power_supply_core.c,
not fit the bill:

[58a36bb06891ee779074db6ef84e98347c634d38]
power: supply: core: Add support for supplied-from device-property

Or was that just meant as a stop gap for something more?

I have no problems adding something further, but I don't have a means to verify
anything ACPI based, beyond a simple build test, so would ideally want someone
to verify that path through the code.