Hi, Rob Best Regards! Anson Huang > -----Original Message----- > From: Rob Herring [mailto:robh@xxxxxxxxxx] > Sent: 2018年12月19日 1:12 > To: Anson Huang <anson.huang@xxxxxxx> > Cc: daniel.lezcano@xxxxxxxxxx; tglx@xxxxxxxxxxxxx; mark.rutland@xxxxxxx; > linux-kernel@xxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx; dl-linux-imx > <linux-imx@xxxxxxx> > Subject: Re: [PATCH V2] dt-bindings: timer: gpt: update binding doc > > On Wed, Dec 12, 2018 at 07:20:44AM +0000, Anson Huang wrote: > > The i.MX GPT timer driver binding doc is out of date, update it > > according to current GPT timer driver. > > > > Signed-off-by: Anson Huang <Anson.Huang@xxxxxxx> > > --- > > .../devicetree/bindings/timer/fsl,imxgpt.txt | 28 > +++++++++++++++++----- > > 1 file changed, 22 insertions(+), 6 deletions(-) > > > > diff --git a/Documentation/devicetree/bindings/timer/fsl,imxgpt.txt > > b/Documentation/devicetree/bindings/timer/fsl,imxgpt.txt > > index 9809b11..2ed84ad 100644 > > --- a/Documentation/devicetree/bindings/timer/fsl,imxgpt.txt > > +++ b/Documentation/devicetree/bindings/timer/fsl,imxgpt.txt > > @@ -2,17 +2,33 @@ Freescale i.MX General Purpose Timer (GPT) > > > > Required properties: > > > > -- compatible : should be "fsl,<soc>-gpt" > > -- reg : Specifies base physical address and size of the registers. > > -- interrupts : A list of 4 interrupts; one per timer channel. > > -- clocks : The clocks provided by the SoC to drive the timer. > > +- compatible : must be one of following: > > + - "fsl,imx1-gpt", > > + - "fsl,imx21-gpt", > > + - "fsl,imx27-gpt", > > + - "fsl,imx31-gpt", > > + - "fsl,imx25-gpt", > > + - "fsl,imx50-gpt", > > + - "fsl,imx51-gpt", > > + - "fsl,imx53-gpt", > > + - "fsl,imx6q-gpt", > > + - "fsl,imx6dl-gpt", > > + - "fsl,imx6sl-gpt", > > + - "fsl,imx6sx-gpt". > > You need to list fall-backs here. IOW, what are the valid combinations? I listed the combinations in V3 patch; > > > +- reg : specifies base physical address and size of the registers. > > +- interrupts : should be the clock event device interrupt. > > 'clock event' is a Linux thing and shouldn't be part of the binding. > > What happened to the 4 interrupts? Yes, using "gpt interrupt" is better than "clock event", and looks like the i.MX GPT driver does NOT support 4 interrupts at all, ONLY 1 general GPT interrupt is needed, so I updated it; > > > +- clocks : the clocks provided by the SoC to drive the timer, must contain > > + an entry for each entry in clock-names. > > +- clock-names : must include "ipg" entry first, then "per" entry, "osc_per" > > + can be a substitute of "per" entry on some SoCs. > > per or osc_per should be deprecated so only one is used going forward. osc_per is just a special case for i.MX6Q, so I remove it, just mention the ipg and per clock. Please help review V3, thanks. Anson. > > > > > Example: > > > > gpt1: timer@10003000 { > > - compatible = "fsl,imx27-gpt", "fsl,imx1-gpt"; > > + compatible = "fsl,imx27-gpt", "fsl,imx21-gpt"; > > reg = <0x10003000 0x1000>; > > interrupts = <26>; > > - clocks = <&clks 46>, <&clks 61>; > > + clocks = <&clks IMX27_CLK_GPT1_IPG_GATE>, > > + <&clks IMX27_CLK_PER1_GATE>; > > clock-names = "ipg", "per"; > > }; > > -- > > 2.7.4 > >
