linux-kernel - RE: [RFC PATCH v3 1/3] firmware: xilinx: Add reset API's

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Date:   Mon, 10 Sep 2018 04:47:05 +0000
From:   Nava kishore Manne <navam@...inx.com>
To:     Philipp Zabel <p.zabel@...gutronix.de>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        Michal Simek <michals@...inx.com>,
        Rajan Vaja <RAJANV@...inx.com>, Jolly Shah <JOLLYS@...inx.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [RFC PATCH v3 1/3] firmware: xilinx: Add reset API's

Hi Philipp

Thanks for the quick response...
Please find my response inline.

> -----Original Message-----
> From: Philipp Zabel [mailto:p.zabel@...gutronix.de]
> Sent: Wednesday, September 5, 2018 4:00 PM
> To: Nava kishore Manne <navam@...inx.com>; robh+dt@...nel.org;
> mark.rutland@....com; Michal Simek <michals@...inx.com>; Rajan Vaja
> <RAJANV@...inx.com>; Jolly Shah <JOLLYS@...inx.com>;
> devicetree@...r.kernel.org; linux-arm-kernel@...ts.infradead.org; linux-
> kernel@...r.kernel.org
> Subject: Re: [RFC PATCH v3 1/3] firmware: xilinx: Add reset API's
> 
> Hi,
> 
> On Wed, 2018-09-05 at 12:39 +0530, Nava kishore Manne wrote:
> > This Patch Adds reset API's to support release, assert and status
> > functionalities by using firmware interface.
> >
> > Signed-off-by: Nava kishore Manne <nava.manne@...inx.com>
> > ---
> > Changes for v3:
> > 		-None.
> > Changes for v2:
> > 		-New Patch.
> >
> >  drivers/firmware/xilinx/zynqmp.c     |  40 +++++++++++
> >  include/linux/firmware/xlnx-zynqmp.h | 136
> > +++++++++++++++++++++++++++++++++++
> >  2 files changed, 176 insertions(+)
> >
> > diff --git a/drivers/firmware/xilinx/zynqmp.c
> > b/drivers/firmware/xilinx/zynqmp.c
> > index 7ccedf0..639c72f 100644
> > --- a/drivers/firmware/xilinx/zynqmp.c
> > +++ b/drivers/firmware/xilinx/zynqmp.c
> > @@ -447,6 +447,44 @@ static int zynqmp_pm_clock_getparent(u32
> clock_id, u32 *parent_id)
> >  	return ret;
> >  }
> >
> > +/**
> > + * zynqmp_pm_reset_assert - Request setting of reset (1 - assert, 0 - release)
> > + * @reset:		Reset to be configured
> > + * @assert_flag:	Flag stating should reset be asserted (1) or
> > + *			released (0)
> > + *
> > + * Return: Returns status, either success or error+reason  */ static
> > +int zynqmp_pm_reset_assert(const enum zynqmp_pm_reset reset,
> > +				  const enum zynqmp_pm_reset_action
> assert_flag) {
> > +	return zynqmp_pm_invoke_fn(PM_RESET_ASSERT, reset, assert_flag,
> > +				   0, 0, NULL);
> > +}
> > +
> > +/**
> > + * zynqmp_pm_reset_get_status - Get status of the reset
> > + * @reset:      Reset whose status should be returned
> > + * @status:     Returned status
> > + *
> > + * Return: Returns status, either success or error+reason  */ static
> > +int zynqmp_pm_reset_get_status(const enum zynqmp_pm_reset reset,
> > +				      u32 *status)
> > +{
> > +	u32 ret_payload[PAYLOAD_ARG_CNT];
> > +	int ret;
> > +
> > +	if (!status)
> > +		return -EINVAL;
> > +
> > +	ret = zynqmp_pm_invoke_fn(PM_RESET_GET_STATUS, reset, 0,
> > +				  0, 0, ret_payload);
> > +	*status = ret_payload[1];
> 
> It doesn't really matter here, but in general I'd skip writing output arguments in
> case of error.
> For all I know, the result returned in ret_payload could be undefined.
> 

Will fix in the next version.

Regards,
Navakishore.