From: Lee Jones <lee.jones@linaro.org>
To: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Cc: robh+dt@kernel.org, mark.rutland@arm.com,
alexandre.torgue@st.com, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, thierry.reding@gmail.com,
linux-pwm@vger.kernel.org, jic23@kernel.org, knaack.h@gmx.de,
lars@metafoo.de, pmeerw@pmeerw.net, linux-iio@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, fabrice.gasnier@st.com,
gerald.baeza@st.com, arnaud.pouliquen@st.com,
linus.walleij@linaro.org, linaro-kernel@lists.linaro.org,
Benjamin Gaignard <benjamin.gaignard@st.com>
Subject: Re: [PATCH v3 3/7] PWM: add pwm-stm32 DT bindings
Date: Fri, 2 Dec 2016 14:23:02 +0000 [thread overview]
Message-ID: <20161202142302.GO2683@dell> (raw)
In-Reply-To: <1480673842-20804-4-git-send-email-benjamin.gaignard@st.com>
On Fri, 02 Dec 2016, Benjamin Gaignard wrote:
> Define bindings for pwm-stm32
>
> version 2:
> - use parameters instead of compatible of handle the hardware configuration
>
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com>
> ---
> .../devicetree/bindings/pwm/pwm-stm32.txt | 38 ++++++++++++++++++++++
> 1 file changed, 38 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..575b9fb
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pwm/pwm-stm32.txt
> @@ -0,0 +1,38 @@
> +STMicroelectronics PWM driver bindings for STM32
> +
> +Must be a sub-node of STM32 general purpose timer driver
> +Parent node properties are describe in ../mfd/stm32-general-purpose-timer.txt
> +
> +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, please refer to [1].
> +
> +Optional parameters:
> +- st,breakinput: Set if the hardware have break input capabilities
> +- st,breakinput-polarity: Set break input polarity. Default is 0
> + The value define the active polarity:
> + - 0 (active LOW)
> + - 1 (active HIGH)
> +- st,breakinput-polarity-high
Then assume the default if the property is not present.
> +- st,pwm-num-chan: Number of available PWM channels. Default is 0.
What's the point in having a PWM device with no channels?
Best to make this a compulsory property.
> +- st,32bits-counter: Set if the hardware have a 32 bits counter
> +- st,complementary: Set if the hardware have complementary output channels
> +
> +[1] Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
Use relative path.
../pinctrl/pinctrl-bindings.txt
> +Example:
> + gptimer1: gptimer1@40010000 {
> + compatible = "st,stm32-gptimer";
> + reg = <0x40010000 0x400>;
> + clocks = <&rcc 0 160>;
> + clock-names = "clk_int";
> +
> + pwm1@0 {
Don't number the node name.
pwm@xx
> + compatible = "st,stm32-pwm";
> + st,pwm-num-chan = <4>;
> + st,breakinput;
> + st,complementary;
> + };
> + };
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
next prev parent reply other threads:[~2016-12-02 14:19 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-02 10:17 [PATCH v3 0/7] Add pwm and IIO timer drivers for stm32 Benjamin Gaignard
2016-12-02 10:17 ` [PATCH v3 1/7] MFD: add bindings for stm32 general purpose timer driver Benjamin Gaignard
2016-12-02 10:17 ` [PATCH v3 2/7] MFD: add " Benjamin Gaignard
2016-12-02 14:29 ` Lee Jones
2016-12-02 10:17 ` [PATCH v3 3/7] PWM: add pwm-stm32 DT bindings Benjamin Gaignard
2016-12-02 14:23 ` Lee Jones [this message]
2016-12-05 6:53 ` Thierry Reding
2016-12-05 8:35 ` Lee Jones
2016-12-05 10:50 ` Thierry Reding
2016-12-05 11:08 ` Benjamin Gaignard
2016-12-05 11:23 ` Thierry Reding
2016-12-05 12:12 ` Benjamin Gaignard
2016-12-05 12:21 ` Thierry Reding
2016-12-02 10:17 ` [PATCH v3 4/7] PWM: add pwm driver for stm32 plaftorm Benjamin Gaignard
2016-12-05 7:23 ` Thierry Reding
2016-12-05 8:31 ` Lee Jones
2016-12-05 11:02 ` Benjamin Gaignard
2016-12-05 11:30 ` Thierry Reding
2016-12-02 10:17 ` [PATCH v3 5/7] IIO: add bindings for stm32 timer trigger driver Benjamin Gaignard
2016-12-02 13:59 ` Lee Jones
2016-12-02 14:23 ` Benjamin Gaignard
2016-12-03 9:35 ` Jonathan Cameron
2016-12-02 10:17 ` [PATCH v3 6/7] IIO: add STM32 " Benjamin Gaignard
2016-12-02 13:57 ` Lee Jones
2016-12-02 10:17 ` [PATCH v3 7/7] ARM: dts: stm32: add stm32 general purpose timer driver in DT Benjamin Gaignard
2016-12-02 13:22 ` Lee Jones
2016-12-03 9:42 ` Jonathan Cameron
2016-12-05 8:54 ` Lee Jones
2016-12-05 16:09 ` Alexandre Torgue
2016-12-06 9:48 ` Lee Jones
2016-12-06 9:56 ` Alexandre Torgue
2016-12-06 12:54 ` Lee Jones
2016-12-02 13:41 ` Alexandre Torgue
2016-12-03 9:45 ` Jonathan Cameron
2016-12-03 9:32 ` [PATCH v3 0/7] Add pwm and IIO timer drivers for stm32 Jonathan Cameron
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