linux-kernel - RE: [v5,2/2] Documentation: dt: binding: rtc: add binding for ftm alarm driver

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Date:   Wed, 17 Jul 2019 09:37:53 +0000
From:   Biwen Li <biwen.li@....com>
To:     Leo Li <leoyang.li@....com>,
        "a.zummo@...ertech.it" <a.zummo@...ertech.it>,
        "alexandre.belloni@...tlin.com" <alexandre.belloni@...tlin.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>
CC:     "linux-rtc@...r.kernel.org" <linux-rtc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Xiaobo Xie <xiaobo.xie@....com>,
        Jiafei Pan <jiafei.pan@....com>, Ran Wang <ran.wang_1@....com>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: RE: [v5,2/2] Documentation: dt: binding: rtc: add binding for ftm
 alarm driver

> > From: Biwen Li <biwen.li@....com>
> > Sent: Tuesday, July 16, 2019 5:17 AM
> > To: a.zummo@...ertech.it; alexandre.belloni@...tlin.com; Leo Li
> > <leoyang.li@....com>; robh+dt@...nel.org
> > Cc: linux-rtc@...r.kernel.org; linux-kernel@...r.kernel.org; Xiaobo
> > Xie <xiaobo.xie@....com>; Jiafei Pan <jiafei.pan@....com>; Ran Wang
> > <ran.wang_1@....com>; mark.rutland@....com;
> > devicetree@...r.kernel.org; Biwen Li <biwen.li@....com>
> > Subject: [v5,2/2] Documentation: dt: binding: rtc: add binding for ftm
> > alarm driver
> >
> > The patch adds binding for ftm alarm driver
> >
> > Signed-off-by: Biwen Li <biwen.li@....com>
> > ---
> > Change in v5:
> >     - None
> >
> > Change in v4:
> >     - add note about dts and kernel options
> >     - add aliases in example
> >
> > Change in v3:
> > 	- remove reg-names property
> > 	- correct cells number
> >
> > Change in v2:
> > 	- replace ls1043a with ls1088a as example
> > 	- add rcpm node and fsl,rcpm-wakeup property
> >
> >
> >  .../bindings/rtc/rtc-fsl-ftm-alarm.txt        | 49 +++++++++++++++++++
> >  1 file changed, 49 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/rtc/rtc-fsl-ftm-
> > alarm.txt
> >
> > diff --git
> > a/Documentation/devicetree/bindings/rtc/rtc-fsl-ftm-alarm.txt
> > b/Documentation/devicetree/bindings/rtc/rtc-fsl-ftm-alarm.txt
> > new file mode 100644
> > index 000000000000..fb018065406c
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/rtc/rtc-fsl-ftm-alarm.txt
> > @@ -0,0 +1,49 @@
> > +Freescale FlexTimer Module (FTM) Alarm
> > +
> > +Note:
> > +- The driver depends on RCPM driver
> > +  to wake up system in sleep.
> > +- Need stop using RTC_HCTOSYS or use the DT aliases
> > +  to ensure the driver is not used as the primary RTC.
> > +  (Select DT aliases defaultly)
> > +
> > +Required properties:
> > +- compatible : Should be "fsl,<chip>-ftm-alarm", the
> > +	       supported chips include
> > +	       "fsl,ls1012a-ftm-alarm"
> > +	       "fsl,ls1021a-ftm-alarm"
> > +	       "fsl,ls1028a-ftm-alarm"
> > +	       "fsl,ls1043a-ftm-alarm"
> > +	       "fsl,ls1046a-ftm-alarm"
> > +	       "fsl,ls1088a-ftm-alarm"
> > +	       "fsl,ls208xa-ftm-alarm"
> > +- reg : Specifies base physical address and size of the register sets
> > +for the
> > +  FlexTimer Module and base physical address of IP Powerdown
> > +Exception
> > Control
> > +  Register.
> 
> You removed the IP Powerdown exception register in the examples, but not
> here.
Ok,I will remove it in v6.
> 
> > +- interrupts : Should be the FlexTimer Module interrupt.
> > +- fsl,rcpm-wakeup property and rcpm node : Please refer
> > +	Documentation/devicetree/bindings/soc/fsl/rcpm.txt
> > +
> > +Optional properties:
> > +- big-endian: If the host controller is big-endian mode, specify this property.
> > +  The default endian mode is little-endian.
> > +
> > +Example:
> > +aliases {
> > +	...
> > +	rtc1 = ftm_alarm0; /* Use flextimer alarm driver as /dev/rtc1 */
> > +	...
> > +};
> > +
> > +rcpm: rcpm@...4040 {
> > +	compatible = "fsl,ls1088a-rcpm", "fsl,qoriq-rcpm-2.1+";
> > +	reg = <0x0 0x1e34040 0x0 0x18>;
> > +	fsl,#rcpm-wakeup-cells = <6>;
> > +};
> > +
> > +ftm_alarm0: timer@...0000 {
> > +	compatible = "fsl,ls1088a-ftm-alarm";
> > +	reg = <0x0 0x2800000 0x0 0x10000>;
> > +	fsl,rcpm-wakeup = <&rcpm 0x0 0x0 0x0 0x0 0x4000 0x0>;
> > +	interrupts = <0 44 4>;
> > +};
> > --
> > 2.17.1