linux-kernel - Re: [PATCH v2 3/5] ARM: dts: NSP: Add common bindings for MX64/MX65

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Date:   Sun, 13 Jun 2021 00:14:11 +0100
From:   Matthew Hagan <mnhagan88@...il.com>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>, Rob Herring <robh+dt@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
        soc@...nel.org, Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Sam Ravnborg <sam@...nborg.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 3/5] ARM: dts: NSP: Add common bindings for MX64/MX65

On 11/06/2021 21:30, Vladimir Oltean wrote:

> On Fri, Jun 11, 2021 at 12:27:15AM +0100, Matthew Hagan wrote:
>> These bindings are required for all Meraki MX64/MX65 devices.
>>
>> Signed-off-by: Matthew Hagan <mnhagan88@...il.com>
>> ---
>>  .../dts/bcm958625-meraki-mx6x-common.dtsi     | 148 ++++++++++++++++++
>>  1 file changed, 148 insertions(+)
>>  create mode 100644 arch/arm/boot/dts/bcm958625-meraki-mx6x-common.dtsi
>>
>> diff --git a/arch/arm/boot/dts/bcm958625-meraki-mx6x-common.dtsi b/arch/arm/boot/dts/bcm958625-meraki-mx6x-common.dtsi
>> new file mode 100644
>> index 000000000000..47a30dedf7b3
>> --- /dev/null
>> +++ b/arch/arm/boot/dts/bcm958625-meraki-mx6x-common.dtsi
>> @@ -0,0 +1,148 @@
>> +// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
>> +/*
>> + * Common Bindings for Cisco Meraki MX64 (Kingpin) and MX65 (Alamo) devices.
>> + *
>> + * Copyright (C) 2021 Matthew Hagan <mnhagan88@...il.com>
>> + */
>> +
>> +#include "bcm-nsp.dtsi"
>> +#include <dt-bindings/gpio/gpio.h>
>> +
>> +/ {
>> +	chosen {
>> +		stdout-path = "serial0:115200n8";
>> +	};
>> +
>> +	memory {
>> +		device_type = "memory";
>> +		reg = <0x60000000 0x80000000>;
>> +	};
>> +
>> +	pwm-leds {
>> +		compatible = "pwm-leds";
>> +
>> +		red {
>> +			label = "red:led";
>> +			pwms = <&pwm 1 50000>;
>> +		};
>> +
>> +		green {
>> +			label = "green:led";
>> +			pwms = <&pwm 2 50000>;
>> +		};
>> +
>> +		blue {
>> +			label = "blue:led";
>> +			pwms = <&pwm 3 50000>;
>> +		};
>> +	};
>> +};
>> +
>> +&L2 {
>> +	arm,io-coherent;
>> +	prefetch-data = <1>;
>> +	prefetch-instr = <1>;
>> +};
> It is common practice to sort labels alphabetically and nodes by unit address.
This will be done. Thanks.
>
>> +
>> +&uart0 {
>> +	clock-frequency = <62500000>;
>> +	status = "okay";
>> +};
>> +
>> +&i2c0 {
>> +	status = "okay";
>> +	at24@50 {
>> +		compatible = "atmel,24c64";
>> +		pagesize = <32>;
>> +		reg = <0x50>;
>> +	};
>> +};
>> +
>> +&amac2 {
>> +	status = "okay";
>> +};
>> +
>> +&nand {
>> +	nandcs@0 {
>> +		compatible = "brcm,nandcs";
>> +		reg = <0>;
>> +		nand-on-flash-bbt;
>> +
>> +		#address-cells = <1>;
>> +		#size-cells = <1>;
>> +
>> +		nand-ecc-strength = <24>;
>> +		nand-ecc-step-size = <1024>;
>> +
>> +		brcm,nand-oob-sector-size = <27>;
>> +
>> +		partition@0 {
>> +			label = "u-boot";
>> +			reg = <0x0 0x80000>;
>> +			read-only;
>> +		};
>> +
>> +		partition@...00 {
>> +			label = "shmoo";
>> +			reg = <0x80000 0x80000>;
>> +			read-only;
>> +		};
>> +
>> +		partition@...000 {
>> +			label = "bootkernel1";
>> +			reg = <0x100000 0x300000>;
>> +		};
>> +
>> +		partition@...000 {
>> +			label = "senao_nvram";
>> +			reg = <0x400000 0x100000>;
>> +		};
>> +
>> +		partition@...000 {
>> +			label = "bootkernel2";
>> +			reg = <0x500000 0x300000>;
>> +		};
>> +
>> +		partition@...000 {
>> +			label = "ubi";
>> +			reg = <0x800000 0x3f700000>;
>> +		};
>> +	};
>> +};
>> +
>> +&qspi {
>> +	status = "disabled";
>> +};
>> +
>> +&ehci0 {
>> +	status = "okay";
>> +};
>> +
>> +&ohci0 {
>> +	status = "okay";
>> +};
>> +
>> +&pwm {
>> +	status = "okay";
>> +	#pwm-cells = <2>;
> What is the reason for overriding this to 2?

I can't provide an explanation other than that it only works at 2.

When set to 3 I get the following:

[    0.784051] OF: /pwm-leds/red: #pwm-cells = 3 found -1
[    0.789201] of_pwm_get(): can't parse "pwms" property
[    0.794295] leds_pwm pwm-leds: error -EINVAL: unable to request PWM for red:led
[    0.801628] leds_pwm: probe of pwm-leds failed with error -22

>> +	chan0 {
>> +		channel = <1>;
>> +		active_low = <1>;
>> +		};
> Bad indentation for this bracket.
This will be removed in v3
>
>> +	chan1 {
>> +		channel = <2>;
>> +		active_low = <1>;
>> +	};
>> +	chan2 {
>> +		channel = <3>;
>> +		active_low = <1>;
>> +	};
>> +};
>> +
>> +&ccbtimer1 {
>> +	status = "disabled";
>> +};
>> +
>> +&sata_phy {
>> +	status = "disabled";
>> +};
> It is common practice to disable these in the common SoC dtsi and let
> individual boards enable them as necessary, instead of the opposite.
Will add patches in v3 to disable ccbtimers and qspi by default. The sata_phy one is not required.
>
>> -- 
>> 2.26.3
>>
>