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Date: Fri, 15 Jun 2018 14:07:05 +0200
From: Nicolas Ferre <nicolas.ferre@...rochip.com>
To: Ben Whitten <Ben.Whitten@...rdtech.com>,
Ben Whitten <ben.whitten@...il.com>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
Alexandre Belloni <alexandre.belloni@...tlin.com>
CC: Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/4] arm: dts: add support for Laird WB45N cpu module and
DVK
On 15/06/2018 at 12:01, Ben Whitten wrote:
>> On 14/06/2018 at 10:51, Ben Whitten wrote:
>>> Signed-off-by: Ben Whitten <ben.whitten@...rdtech.com>
>>> ---
>>> arch/arm/boot/dts/Makefile | 3 +-
>>> arch/arm/boot/dts/at91-wb45n.dts | 66 +++++++++++++++
>>> arch/arm/boot/dts/at91-wb45n.dtsi | 169
>> ++++++++++++++++++++++++++++++++++++++
>>> 3 files changed, 237 insertions(+), 1 deletion(-)
>>> create mode 100644 arch/arm/boot/dts/at91-wb45n.dts
>>> create mode 100644 arch/arm/boot/dts/at91-wb45n.dtsi
>>>
>>> diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
>>> index 7e24249..1ee94ee 100644
>>> --- a/arch/arm/boot/dts/Makefile
>>> +++ b/arch/arm/boot/dts/Makefile
>>> @@ -42,7 +42,8 @@ dtb-$(CONFIG_SOC_AT91SAM9) += \
>>> at91sam9g25ek.dtb \
>>> at91sam9g35ek.dtb \
>>> at91sam9x25ek.dtb \
>>> - at91sam9x35ek.dtb
>>> + at91sam9x35ek.dtb \
>>> + at91-wb45n.dtb
>>> dtb-$(CONFIG_SOC_SAM_V7) += \
>>> at91-kizbox2.dtb \
>>> at91-nattis-2-natte-2.dtb \
>>> diff --git a/arch/arm/boot/dts/at91-wb45n.dts b/arch/arm/boot/dts/at91-
>> wb45n.dts
>>> new file mode 100644
>>> index 0000000..4e88815
>>> --- /dev/null
>>> +++ b/arch/arm/boot/dts/at91-wb45n.dts
>>> @@ -0,0 +1,66 @@
>>> +// SPDX-License-Identifier: GPL-2.0
>>> +/*
>>> + * at91-wb45n.dts - Device Tree file for WB45NBT board
>>> + *
>>> + * Copyright (C) 2018 Laird
>>> + *
>>> +*/
>>> +/dts-v1/;
>>> +#include "at91-wb45n.dtsi"
>>> +
>>> +/ {
>>> + model = "Laird Workgroup Bridge 45N - Atmel AT91SAM (dt)";
>>> + compatible = "laird,wb45n", "laird,wbxx", "atmel,at91sam9x5",
>> "atmel,at91sam9";
>>
>> "laird" prefix must be added to
>> Documentation/devicetree/bindings/vendor-prefixes.txt before using it:
>> you can do a little patch as a first patch of this series.
>> Otherwise it will trigger a warning message while running
>> scripts/checkpatch.pl on top of your patch.
>>
>>
>>> +
>>> + ahb {
>>> + apb {
>>> + watchdog@...ffe40 {
>>> + status = "okay";
>>> + };
>>> + };
>>> + };
>>> +
>>> + gpio_keys {
>>> + compatible = "gpio-keys";
>>> + #address-cells = <1>;
>>> + #size-cells = <0>;
>>> + irqbtn@...8 {
>>
>> I'm not sure that the @pb18 can be used like this. This address
>> extension must be used in a "reg" property in the node. dtc used with
>> warning switch on might trigger an error for this.
>>
>>> + label = "IRQBTN";
>>> + linux,code = <99>;
>>> + gpios = <&pioB 18 GPIO_ACTIVE_LOW>;
>>> + gpio-key,wakeup = <1>;
>>> + };
>>> + };
>>> +};
>>> +
>>> +&usb0 {
>>> + status = "okay";
>>> +};
>>> +
>>> +&mmc0 {
>>> + status = "okay";
>>> +};
>>> +
>>> +&spi0 {
>>> + status = "okay";
>>> +};
>>> +
>>> +&macb0 {
>>> + status = "okay";
>>> +};
>>> +
>>> +&dbgu {
>>> + status = "okay";
>>> +};
>>> +
>>> +&usart0 {
>>> + status = "okay";
>>> +};
>>> +
>>> +&usart3 {
>>> + status = "okay";
>>> +};
>>> +
>>> +&i2c1 {
>>> + status = "okay";
>>> +};
>>> diff --git a/arch/arm/boot/dts/at91-wb45n.dtsi b/arch/arm/boot/dts/at91-
>> wb45n.dtsi
>>> new file mode 100644
>>> index 0000000..2fa58e2
>>> --- /dev/null
>>> +++ b/arch/arm/boot/dts/at91-wb45n.dtsi
>>> @@ -0,0 +1,169 @@
>>> +// SPDX-License-Identifier: GPL-2.0
>>> +/*
>>> + * at91-wb45n.dtsi - Device Tree file for WB45NBT board
>>> + *
>>> + * Copyright (C) 2018 Laird
>>> + *
>>> + */
>>> +
>>> +#include "at91sam9g25.dtsi"
>>> +
>>> +/ {
>>> + model = "Laird Workgroup Bridge 45N - Atmel AT91SAM (dt)";
>>> + compatible = "laird,wb45n", "laird,wbxx", "atmel,at91sam9x5",
>> "atmel,at91sam9";
>>> +
>>> + chosen {
>>> + bootargs = "ubi.mtd=6 root=ubi0:rootfs rootfstype=ubifs
>> rw";
>>> + stdout-path = "serial0:115200n8";
>>> + };
>>> +
>>> + memory {
>>> + reg = <0x20000000 0x4000000>;
>>> + };
>>> +
>>> + ahb {
>>> + apb {
>>> + shdwc@...ffe10 {
>>
>> I would advice you to take exactly the node name:
>> "shutdown-controller@...ffe10"; Anyway, it will go away after you use
>> the label notation as advised by Alexandre.
>>
>>> + atmel,wakeup-mode = "low";
>>> + };
>>> +
>>> + pinctrl@...ff400 {
>>> + usb2 {
>>> + pinctrl_board_usb2: usb2-board {
>>> + atmel,pins =
>>> + <AT91_PIOB 11
>> AT91_PERIPH_GPIO AT91_PINCTRL_DEGLITCH>; /* PB11 gpio
>> vbus sense, deglitch */
>>> + };
>>> + };
>>> + };
>>> +
>>> + rstc@...ffe00 {
>>> + compatible = "atmel,sama5d3-rstc";
>>> + };
>>
>> I don't think this node is needed.
>
> I dug through our old code reviews and found this message relating to testing
> reboot over several thousand times in our testbed:
> After the slow clock has been enabled on the reset controller via upstream
> changes, the dram disable access and power down code is causing the SAM9G25
> to hang occasionally on reboot. Using the simple reset function provided
> for SAMA5D3 instead.
>
> So it appears to be a workaround for a bug that existed ~2 years ago, may still be
> relevant as there haven't been many changes to the reset code in that time.
All right, I read too quickly and thought it was sama5d3... Your
feedback is interesting anyway. I'll store this for future reference and
investigation.
>>> +
>>> + };
>>> + };
>>> +
>>> + atheros {
>>> + compatible = "atheros,ath6kl";
>>> + atheros,board-id = "SD32";
>>> + };
>>> +};
>>> +
>>> +&slow_xtal {
>>> + clock-frequency = <32768>;
>>> +};
>>> +
>>> +&main_xtal {
>>> + clock-frequency = <12000000>;
>>> +};
>>> +
>>> +&ebi {
>>> + status = "okay";
>>> + nand_controller: nand-controller {
>>> + pinctrl-0 = <&pinctrl_nand_cs &pinctrl_nand_rb
>> &pinctrl_nand_oe_we>;
>>> + pinctrl-names = "default";
>>> + status = "okay";
>>> +
>>> + nand@3 {
>>> + reg = <0x3 0x0 0x800000>;
>>> + rb-gpios = <&pioD 5 GPIO_ACTIVE_HIGH>;
>>> + cs-gpios = <&pioD 4 GPIO_ACTIVE_HIGH>;
>>> + nand-bus-width = <8>;
>>> + nand-ecc-mode = "hw";
>>> + nand-ecc-strength = <4>;
>>> + nand-ecc-step-size = <512>;
>>> + nand-on-flash-bbt;
>>> + label = "atmel_nand";
>>> +
>>> + partitions {
>>> + compatible = "fixed-partitions";
>>> + #address-cells = <1>;
>>> + #size-cells = <1>;
>>> +
>>> + at91bootstrap@0 {
>>> + label = "at91bs";
>>> + reg = <0x0 0x20000>;
>>> + };
>>> +
>>> + uboot@...00 {
>>> + label = "u-boot";
>>> + reg = <0x20000 0x80000>;
>>> + };
>>> +
>>> + ubootenv@...00 {
>>> + label = "u-boot-env";
>>> + reg = <0xa0000 0x20000>;
>>> + };
>>> +
>>> + ubootenv@...00 {
>>> + label = "redund-env";
>>> + reg = <0xc0000 0x20000>;
>>> + };
>>> +
>>> + kernel-a@...00 {
>>> + label = "kernel-a";
>>> + reg = <0xe0000 0x280000>;
>>> + };
>>> +
>>> + kernel-b@...000 {
>>> + label = "kernel-b";
>>> + reg = <0x360000 0x280000>;
>>> + };
>>> +
>>> + rootfs-a@...000 {
>>> + label = "rootfs-a";
>>> + reg = <0x5e0000 0x2600000>;
>>> + };
>>> +
>>> + rootfs-b@...0000 {
>>> + label = "rootfs-b";
>>> + reg = <0x2be0000 0x2600000>;
>>> + };
>>> +
>>> + user@...0000 {
>>> + label = "user";
>>> + reg = <0x51e0000 0x2dc0000>;
>>> + };
>>> +
>>> + logs@...0000 {
>>> + label = "logs";
>>> + reg = <0x7fa0000 0x60000>;
>>> + };
>>> +
>>> + };
>>> + };
>>> + };
>>> +};
>>> +
>>> +&usb0 {
>>
>> This must be &usb1 label, isn't it?
>> Because you are referring to ohci binding I suspect (found by having a
>> look at: atmel,oc-gpio property...).
>
> I believe usb0 is correct, as this is a at91sam9x5 part, the node in dtsi is -ohci.
> sama5d3 is usb1 for -ohci.
All right, like previous comment, I thought it was sama5d3: sorry for
the noise.
Best regards,
Nicolas
--
Nicolas Ferre
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