From: mishal@softerra•com (mishal)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH v4] ARM: dts: add bcm2835-pwm bindings
Date: Fri, 31 Jul 2015 18:12:42 +0300 [thread overview]
Message-ID: <55BB906A.9000105@softerra.com> (raw)
In-Reply-To: <20150225145017.GB5132@x1>
Tried with latest rpi kernel from github, branch rpi-4.0.y on RaspberryPi A+
on pins 18 and 19
pwm_pins: pwm {
brcm,pins = <18 19>;
brcm,function = <2 2>; /* alt5*/
};
and pins 12, 13
pwm_pins: pwm {
brcm,pins = <12 13>;
brcm,function = <4 4>; /* alt0*/
};
different combinations for period/duty_cycle without any output.
(WiringPi library works on pins 18 and 12.)
Did something changed in recent kernels?
Thank you.
On 25.02.15 16:50, Lee Jones wrote:
> On Thu, 15 Jan 2015, Bart Tanghe wrote:
>
>> To probe the bcm2835-pwm driver properly, this dts bindings has to be added
>> to the bcm2835 dtsi file.
>> In expectation of a bcm2835 clock driver, I've added fixed-clock clock binding.
>> ---
>> Changes in v4:
>> - node added by reg value
>>
>> Signed-off-by: Bart Tanghe <bart.tanghe@thomasmore•be>
>> Acked-by: Stephen Warren <swarren@wwwdotorg•org>
> Applied, thanks.
>
>> diff --git a/arch/arm/boot/dts/bcm2835.dtsi b/arch/arm/boot/dts/bcm2835.dtsi
>> index 3342cb1..e8a0f13 100644
>> --- a/arch/arm/boot/dts/bcm2835.dtsi
>> +++ b/arch/arm/boot/dts/bcm2835.dtsi
>> @@ -122,6 +123,14 @@
>> status = "disabled";
>> };
>>
>> + pwm: pwm at 7e20c000 {
>> + compatible = "brcm,bcm2835-pwm";
>> + reg = <0x7e20c000 0x28>;
>> + clocks = <&clk_pwm>;
>> + #pwm-cells = <2>;
>> + status = "disabled";
>> + };
>> +
>> sdhci: sdhci at 7e300000 {
>> compatible = "brcm,bcm2835-sdhci";
>> reg = <0x7e300000 0x100>;
>> @@ -179,5 +188,13 @@
>> clock-output-names = "spi";
>> clock-frequency = <250000000>;
>> };
>> +
>> + clk_pwm: clock at 3 {
>> + compatible = "fixed-clock";
>> + reg = <3>;
>> + #clock-cells = <0>;
>> + clock-output-names = "pwm";
>> + clock-frequency = <9200000>;
>> + };
>> };
>> };
prev parent reply other threads:[~2015-07-31 15:12 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-15 12:33 [PATCH v4] ARM: dts: add bcm2835-pwm bindings Bart Tanghe
2015-02-25 14:50 ` Lee Jones
2015-07-31 15:12 ` mishal [this message]
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