linux-kernel - RE: [PATCH] ARM: dts: imx6sx-sdb: Add flexcan support

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Date:   Sat, 20 Oct 2018 02:03:34 +0000
From:   Joakim Zhang <qiangqing.zhang@....com>
To:     Fabio Estevam <festevam@...il.com>
CC:     Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Sascha Hauer <kernel@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        dl-linux-imx <linux-imx@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "A.s. Dong" <aisheng.dong@....com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH] ARM: dts: imx6sx-sdb: Add flexcan support


-----Original Message-----
From: Fabio Estevam [mailto:festevam@...il.com] 
Sent: 2018年10月19日 20:52
To: Joakim Zhang <qiangqing.zhang@....com>
Cc: Shawn Guo <shawnguo@...nel.org>; Sascha Hauer <s.hauer@...gutronix.de>; Sascha Hauer <kernel@...gutronix.de>; Fabio Estevam <fabio.estevam@....com>; dl-linux-imx <linux-imx@....com>; Rob Herring <robh+dt@...nel.org>; Mark Rutland <mark.rutland@....com>; A.s. Dong <aisheng.dong@....com>; open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS <devicetree@...r.kernel.org>; linux-kernel <linux-kernel@...r.kernel.org>; moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] ARM: dts: imx6sx-sdb: Add flexcan support

Hi Joakim,

On Fri, Oct 19, 2018 at 6:43 AM Joakim Zhang <qiangqing.zhang@....com> wrote:
>
> From: Dong Aisheng <aisheng.dong@....com>
>
> CAN transceiver is different on RevA and RevB board.
> It's active high on RevA while active low on Rev B.
>
> Signed-off-by: Dong Aisheng <aisheng.dong@....com>
> Signed-off-by: Joakim Zhang <qiangqing.zhang@....com>
> ---
>  arch/arm/boot/dts/imx6sx-sdb.dts  |  5 ++++  
> arch/arm/boot/dts/imx6sx-sdb.dtsi | 42 +++++++++++++++++++++++++++++++
>  2 files changed, 47 insertions(+)
>
> diff --git a/arch/arm/boot/dts/imx6sx-sdb.dts 
> b/arch/arm/boot/dts/imx6sx-sdb.dts
> index 6dd9bebfe027..092b8de142a8 100644
> --- a/arch/arm/boot/dts/imx6sx-sdb.dts
> +++ b/arch/arm/boot/dts/imx6sx-sdb.dts
> @@ -10,6 +10,11 @@
>
>  / {
>         model = "Freescale i.MX6 SoloX SDB RevB Board";
> +
> +       /* Transceiver EN/STBY is active low on RevB board */
> +       reg_can_stby: regulator-can-stby {
> +               gpio = <&gpio4 27 GPIO_ACTIVE_LOW>;

Don't we need a  gpio = <&gpio4 27 GPIO_ACTIVE_HIGH>; and also a "enable-active-high" entries in the imx6sx-sdb-reva.dts?

Yes, you are right. I will add the entry in the imx6sx-sdb-reva.dts. Thanks a lot! 

BRs,
Jaokim Zhang