From: Alexandre Belloni <alexandre.belloni@bootlin.com>
To: Biju Das <biju.das@bp.renesas.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>,
Alessandro Zummo <a.zummo@towertech.it>,
Geert Uytterhoeven <geert+renesas@glider.be>,
"linux-rtc@vger.kernel.org" <linux-rtc@vger.kernel.org>,
Simon Horman <horms@verge.net.au>,
Chris Paterson <Chris.Paterson2@renesas.com>,
Fabrizio Castro <fabrizio.castro@bp.renesas.com>,
Linux-Renesas <linux-renesas-soc@vger.kernel.org>,
Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Subject: Re: [PATCH v3 2/4] rtc: pcf85363: Add support for NXP pcf85263 rtc
Date: Thu, 6 Dec 2018 17:52:02 +0100 [thread overview]
Message-ID: <20181206165202.GC8952@piout.net> (raw)
In-Reply-To: <OSBPR01MB2103A13E75634AD81CFD1628B8A90@OSBPR01MB2103.jpnprd01.prod.outlook.com>
On 06/12/2018 15:49:57+0000, Biju Das wrote:
> Hi Geert,
>
> Thanks for the feedback.
>
> > Subject: Re: [PATCH v3 2/4] rtc: pcf85363: Add support for NXP pcf85263 rtc
> >
> > Hi Biju,
> >
> > On Thu, Dec 6, 2018 at 4:24 PM Biju Das <biju.das@bp.renesas.com> wrote:
> > > > Subject: Re: [PATCH v3 2/4] rtc: pcf85363: Add support for NXP
> > > > pcf85263 rtc CC nvmem maintainer
> > > >
> > > > On Thu, Dec 6, 2018 at 10:04 AM Biju Das <biju.das@bp.renesas.com>
> > wrote:
> > > > > Add support for NXP pcf85263 real-time clock. pcf85263 rtc is
> > > > > compatible with pcf85363,except that pcf85363 has additional 64
> > > > > bytes of
> > > > RAM.
> >
> > > > > --- a/drivers/rtc/rtc-pcf85363.c
> > > > > +++ b/drivers/rtc/rtc-pcf85363.c
> > > > > @@ -120,6 +120,11 @@ struct pcf85363 {
> > > > > struct regmap *regmap;
> > > > > };
> > > > >
> > > > > +struct pcf85x63_config {
> > > > > + struct regmap_config regmap;
> > > > > + unsigned int num_nvram;
> > > > > +};
> > > > > +
> > > > > static int pcf85363_rtc_read_time(struct device *dev, struct
> > > > > rtc_time
> > > > > *tm) {
> > > > > struct pcf85363 *pcf85363 = dev_get_drvdata(dev); @@
> > > > > -311,25
> > > > > +316,68 @@ static int pcf85363_nvram_write(void *priv, unsigned
> > > > > +int
> > > > offset, void *val,
> > > > > val, bytes); }
> > > > >
> > > > > -static const struct regmap_config regmap_config = {
> > > > > - .reg_bits = 8,
> > > > > - .val_bits = 8,
> > > > > - .max_register = 0x7f,
> > > > > +static int pcf85x63_nvram_read(void *priv, unsigned int offset, void
> > *val,
> > > > > + size_t bytes)
> > > >
> > > > Given bytes should be 1, val should be a pointer to a single byte...
> > > > What if bytes == 0?
> > >
> > > I doubt we get "bytes==0" because of the checks in "
> > drivers/nvmem/core.c"
> > > Function " bin_attr_nvmem_read/ bin_attr_nvmem_write".
> >
> > Depends. There are other functions calling nvmem_reg_{read,write}(), e.g.
> > nvmem_device_{read,write}().
>
> OK. In that case, I will return (-EINVAL) for "bytes !=1"
>
I think it is probably better to ensure the nvmem core never passes an
invalid number of bytes. All the ther RTC drivers make that assumption.
--
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
next prev parent reply other threads:[~2018-12-06 16:52 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-06 8:55 [PATCH v3 0/4] Add NXP pcf85263 real-time clock support Biju Das
2018-12-06 8:55 ` [PATCH v3 1/4] dt-bindings: rtc: pcf85363: Document pcf85263 real-time clock Biju Das
2018-12-06 9:13 ` Geert Uytterhoeven
2018-12-06 8:55 ` [PATCH v3 2/4] rtc: pcf85363: Add support for NXP pcf85263 rtc Biju Das
2018-12-06 9:39 ` Geert Uytterhoeven
2018-12-06 15:24 ` Biju Das
2018-12-06 15:37 ` Geert Uytterhoeven
2018-12-06 15:49 ` Biju Das
2018-12-06 16:52 ` Alexandre Belloni [this message]
2018-12-07 9:34 ` Biju Das
2018-12-07 9:45 ` Geert Uytterhoeven
2018-12-07 10:16 ` Biju Das
2018-12-07 10:18 ` Geert Uytterhoeven
2018-12-06 8:55 ` [PATCH v3 3/4] ARM: shmobile: Enable NXP pcf85363 rtc in shmobile_defconfig Biju Das
2018-12-06 9:41 ` Geert Uytterhoeven
2018-12-06 8:55 ` [PATCH v3 4/4] ARM: dts: iwg23s-sbc: Enable RTC Biju Das
2018-12-06 9:55 ` Geert Uytterhoeven
2018-12-06 12:40 ` Biju Das
2018-12-06 12:59 ` Geert Uytterhoeven
2018-12-10 11:52 ` Simon Horman
2018-12-10 11:56 ` Geert Uytterhoeven
2018-12-10 12:15 ` Simon Horman
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