linux-kernel - RE: [PATCH v2 2/4] iio: adc: xilinx: limit pcap clock frequency value

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Message-ID: <SN6PR02MB495915F6DDEC42F4F44DB13BC12F0@SN6PR02MB4959.namprd02.prod.outlook.com>
Date:   Mon, 30 Jul 2018 10:13:26 +0000
From:   Manish Narani <MNARANI@...inx.com>
To:     Jonathan Cameron <jic23@...nel.org>
CC:     Sai Krishna Potthuri <lakshmis@...inx.com>,
        Michal Simek <michals@...inx.com>,
        "pmeerw@...erw.net" <pmeerw@...erw.net>,
        "lars@...afoo.de" <lars@...afoo.de>,
        "knaack.h@....de" <knaack.h@....de>,
        Anirudha Sarangi <anirudh@...inx.com>,
        Srinivas Goud <sgoud@...inx.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>
Subject: RE: [PATCH v2 2/4] iio: adc: xilinx: limit pcap clock frequency value

Hi Jonathan,


> -----Original Message-----
> From: Jonathan Cameron [mailto:jic23@...nel.org]
> Sent: Sunday, July 29, 2018 5:21 PM
> To: Manish Narani <MNARANI@...inx.com>
> Cc: Sai Krishna Potthuri <lakshmis@...inx.com>; Michal Simek
> <michals@...inx.com>; pmeerw@...erw.net; lars@...afoo.de;
> knaack.h@....de; Anirudha Sarangi <anirudh@...inx.com>; Srinivas Goud
> <sgoud@...inx.com>; linux-kernel@...r.kernel.org; linux-arm-
> kernel@...ts.infradead.org; linux-iio@...r.kernel.org
> Subject: Re: [PATCH v2 2/4] iio: adc: xilinx: limit pcap clock frequency value
> 
> On Mon, 23 Jul 2018 20:32:01 +0530
> Manish Narani <manish.narani@...inx.com> wrote:
> 
> > This patch limits the xadc pcap clock frequency value to be less than
> > 200MHz. This fixes the issue when zynq is booted at higher frequency
> > values, pcap crosses the maximum limit of 200MHz(Fmax) as it is
> > derived from IOPLL.
> > If this limit is crossed it is required to alter the WEDGE and REDGE
> > bits of XADC_CFG register to make timings better in the interface. So
> > to avoid alteration of these bits every time, the pcap value should
> > not cross the Fmax limit.
> >
> > Signed-off-by: Manish Narani <manish.narani@...inx.com>
> 
> Applied, to the togreg branch of iio.git.  If you want this backported to stable,
> then request it once this patch is upstream.  It may be sometime given we've
> probably just missed the coming merge window.
> 
> If you do need it faster then let me know and I'll look at moving it over to the
> branch of fixes during the RC phases.
Thanks for getting this applied. There is no concern for this to be in the stable
ASAP. I can wait.

Thanks & Regards,
Manish Narani