linux-kernel - Re: [PATCH] arm: dts: Add am335x-boneblack-pps.dts

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Date:   Fri, 28 Apr 2023 15:50:10 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Julien Panis <jpanis@...libre.com>, arnd@...db.de, olof@...om.net,
        soc@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, tony@...mide.com
Cc:     linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org
Subject: Re: [PATCH] arm: dts: Add am335x-boneblack-pps.dts

On 28/04/2023 12:54, Julien Panis wrote:
> From: Lokesh Vutla <lokeshvutla@...com>
> 
> Add a new am335x-boneblack-pps.dts that can be used to configure TIMER7
> in PWM mode. This PWM signal can be used as a PPS signal when
> synchronized to PTP clock. Typically this synchronization is done by a
> userspace program. This PPS signal can be observed on pin P8.8.
> 
> Signed-off-by: Lokesh Vutla <lokeshvutla@...com>
> Signed-off-by: Vignesh Raghavendra <vigneshr@...com>
> Signed-off-by: Adrien Ricciardi <aricciardi@...libre.com>
> Signed-off-by: Julien Panis <jpanis@...libre.com>

Use subject prefixes matching the subsystem (which you can get for
example with `git log --oneline -- DIRECTORY_OR_FILE` on the directory
your patch is touching). Missing soemthing identifying sub-arch.

> ---
>  arch/arm/boot/dts/Makefile                 |  1 +
>  arch/arm/boot/dts/am335x-boneblack-pps.dts | 25 ++++++++++++++++++++++
>  2 files changed, 26 insertions(+)
>  create mode 100644 arch/arm/boot/dts/am335x-boneblack-pps.dts
> 
> diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
> index efe4152e5846..d74158aae72d 100644
> --- a/arch/arm/boot/dts/Makefile
> +++ b/arch/arm/boot/dts/Makefile
> @@ -939,6 +939,7 @@ dtb-$(CONFIG_SOC_AM33XX) += \
>  	am335x-base0033.dtb \
>  	am335x-bone.dtb \
>  	am335x-boneblack.dtb \
> +	am335x-boneblack-pps.dtb \
>  	am335x-boneblack-wireless.dtb \
>  	am335x-boneblue.dtb \
>  	am335x-bonegreen.dtb \
> diff --git a/arch/arm/boot/dts/am335x-boneblack-pps.dts b/arch/arm/boot/dts/am335x-boneblack-pps.dts
> new file mode 100644
> index 000000000000..88d2bc3fd759
> --- /dev/null
> +++ b/arch/arm/boot/dts/am335x-boneblack-pps.dts
> @@ -0,0 +1,25 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (C) 2023 Texas Instruments Incorporated - http://www.ti.com/
> + */
> +
> +#include "am335x-boneblack.dts"

Probably you need here compatible (and binding as separate patch).

> +
> +&am33xx_pinmux {
> +	pwm7_pins: pinmux_pwm7_pins {

No underscores in node names.


> +		pinctrl-single,pins = <
> +			AM33XX_PADCONF(AM335X_PIN_GPMC_OEN_REN, PIN_OUTPUT_PULLDOWN, MUX_MODE2)
> +		>;
> +	};
> +};
> +
> +/{
> +	pwm7: dmtimer-pwm7 {

Node names should be generic.
https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation

> +		compatible = "ti,omap-dmtimer-pwm";
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&pwm7_pins>;
> +		#pwm-cells = <3>;
> +		ti,timers = <&timer7>;
> +		ti,clock-source = <0x00>; /* timer_sys_ck */

Why this is hex? Should be just 0/1/2?


> +	};
> +};
> 
> base-commit: fe15c26ee26efa11741a7b632e9f23b01aca4cc6

Best regards,
Krzysztof