linux-kernel - Re: [PATCH 3/4] ARM: dts: am33xx: Add nodes for eQEP

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Date:   Tue, 23 Jul 2019 01:42:13 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     David Lechner <david@...hnology.com>
Cc:     linux-iio@...r.kernel.org, linux-omap@...r.kernel.org,
        devicetree@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Benoît Cousson <bcousson@...libre.com>,
        William Breathitt Gray <vilhelm.gray@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        linux-kernel@...r.kernel.org, linux-pwm@...r.kernel.org
Subject: Re: [PATCH 3/4] ARM: dts: am33xx: Add nodes for eQEP

* David Lechner <david@...hnology.com> [190722 15:46]:
> This adds new nodes for the Texas Instruments Enhanced Quadrature
> Encoder Pulse (eQEP) module in the PWM subsystem on AM33XX.
> 
> Signed-off-by: David Lechner <david@...hnology.com>
> ---
>  arch/arm/boot/dts/am33xx-l4.dtsi | 27 +++++++++++++++++++++++++++
>  1 file changed, 27 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/am33xx-l4.dtsi b/arch/arm/boot/dts/am33xx-l4.dtsi
> index 3b1fb2ba4dff..7fdc2f61c553 100644
> --- a/arch/arm/boot/dts/am33xx-l4.dtsi
> +++ b/arch/arm/boot/dts/am33xx-l4.dtsi
> @@ -1908,6 +1908,15 @@
>  					status = "disabled";
>  				};
>  
> +				eqep0: eqep@180 {
> +					compatible = "ti,am3352-eqep";
> +					reg = <0x180 0x80>;
> +					clocks = <&l4ls_gclk>;
> +					clock-names = "fck";
> +					interrupts = <79>;
> +					status = "disabled";
> +				};
> +

You probably no longer need to map any clocks here as this
is now a child of the interconnect target module managed
by ti-sysc driver. I have not checked but probably l4ls_gclk
is same as clocks = <&l4ls_clkctrl AM3_L4LS_EPWMSS0_CLKCTRL 0>
already managed by ti-sysc. If so, then just using runtime PM
calls in any of the child device drivers will keep it enabled.

If l4ls_gclk is a separate functional clock, then it still
needs to be managed by the child device driver directly.

Regards,

Tony