linux-kernel - Re: [PATCH v6 3/8] PWM: add pwm-stm32 DT bindings

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Message-ID: <20161213111137.GW3625@dell.home>
Date:   Tue, 13 Dec 2016 11:11:37 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        mark.rutland@....com, alexandre.torgue@...com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        thierry.reding@...il.com, linux-pwm@...r.kernel.org,
        jic23@...nel.org, knaack.h@....de, lars@...afoo.de,
        pmeerw@...erw.net, linux-iio@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, fabrice.gasnier@...com,
        gerald.baeza@...com, arnaud.pouliquen@...com,
        linus.walleij@...aro.org, linaro-kernel@...ts.linaro.org,
        Benjamin Gaignard <benjamin.gaignard@...com>
Subject: Re: [PATCH v6 3/8] PWM: add pwm-stm32 DT bindings

On Mon, 12 Dec 2016, Rob Herring wrote:

> On Fri, Dec 09, 2016 at 03:15:14PM +0100, Benjamin Gaignard wrote:
> > Define bindings for pwm-stm32
> > 
> > version 6:
> > - change st,breakinput parameter format to make it usuable on stm32f7 too.
> > 
> > version 2:
> > - use parameters instead of compatible of handle the hardware configuration
> > 
> > Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...com>
> > ---
> >  .../devicetree/bindings/pwm/pwm-stm32.txt          | 33 ++++++++++++++++++++++
> >  1 file changed, 33 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/pwm/pwm-stm32.txt
> > 
> > diff --git a/Documentation/devicetree/bindings/pwm/pwm-stm32.txt b/Documentation/devicetree/bindings/pwm/pwm-stm32.txt
> > new file mode 100644
> > index 0000000..866f222
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/pwm/pwm-stm32.txt
> > @@ -0,0 +1,33 @@
> > +STMicroelectronics STM32 Timers PWM bindings
> > +
> > +Must be a sub-node of an STM32 Timers device tree node.
> > +See ../mfd/stm32-timers.txt for details about the parent node.
> > +
> > +Required parameters:
> > +- compatible:		Must be "st,stm32-pwm".
> > +- pinctrl-names: 	Set to "default".
> > +- pinctrl-0: 		List of phandles pointing to pin configuration nodes for PWM module.
> > +			For Pinctrl properties see ../pinctrl/pinctrl-bindings.txt
> > +
> > +Optional parameters:
> > +- st,breakinput:	Arrays of three u32 <index level filter> to describe break input configurations.
> > +			"index" indicates on which break input the configuration should be applied.
> > +			"level" gives the active level (0=low or 1=high) for this configuration.
> > +			"filter" gives the filtering value to be applied.
> > +
> > +Example:
> > +	timers@...10000 {
> 
> timer@...

No, it should be timers.

The 's' is intentional, since this parent (MFD) device houses 3
different types of timers.  The "timer" node is a child of this one.

> With that,
> 
> Acked-by: Rob Herring <robh@...nel.org>
> 
> 
> > +		#address-cells = <1>;
> > +		#size-cells = <0>;
> > +		compatible = "st,stm32-timers";
> > +		reg = <0x40010000 0x400>;
> > +		clocks = <&rcc 0 160>;
> > +		clock-names = "clk_int";
> > +
> > +		pwm {
> > +			compatible = "st,stm32-pwm";
> > +			pinctrl-0	= <&pwm1_pins>;
> > +			pinctrl-names	= "default";
> > +			st,breakinput = <0 1 5>;
> > +		};
> > +	};

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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