From: Leonard Crestez <leonard.crestez@nxp.com>
To: Lucas Stach <l.stach@pengutronix.de>,
Abel Vesa <abel.vesa@nxp.com>, Peng Fan <peng.fan@nxp.com>
Cc: Anson Huang <anson.huang@nxp.com>,
dl-linux-imx <linux-imx@nxp.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Fabio Estevam <fabio.estevam@nxp.com>, Ye Li <ye.li@nxp.com>,
"robh@kernel.org" <robh@kernel.org>,
"shawnguo@kernel.org" <shawnguo@kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"kernel@pengutronix.de" <kernel@pengutronix.de>
Subject: Re: [RESEND v2] soc: imx: Add generic i.MX8 SoC driver
Date: Thu, 18 Apr 2019 22:01:24 +0000 [thread overview]
Message-ID: <VI1PR04MB5533BF028703707A956DAEA7EE260@VI1PR04MB5533.eurprd04.prod.outlook.com> (raw)
In-Reply-To: 8df8afc4a50512d28247743e06f9ed30534da921.camel@nxp.com
On 3/28/2019 6:43 PM, Leonard Crestez wrote:
> On Fri, 2019-03-22 at 16:49 +0000, Abel Vesa wrote:
>> Add generic i.MX8 SoC driver along with the i.MX8MQ SoC specific code.
>> For now, only i.MX8MQ revision B1 is supported. For any other, i.MX8MQ
>> revision it will print 'unknown'.
>
>> +#define REV_B1 0x21
>> +
>> +#define IMX8MQ_SW_INFO_B1 0x40
>> +#define IMX8MQ_SW_MAGIC_B1 0xff0055aa
>> +
>> + np = of_find_compatible_node(NULL, NULL, "fsl,imx8mq-ocotp");+
>> + ocotp_base = of_iomap(np, 0);
>> +
>> + magic = readl_relaxed(ocotp_base + IMX8MQ_SW_INFO_B1);
>> + if (magic == IMX8MQ_SW_MAGIC_B1)
>> + rev = REV_B1;
>
> This is based on ATF code in vendor tree, but shouldn't we have some
> sort of explanation for this "magic"?
>
> Looking at the OCOTP driver reg 0x40 is IMX_OCOTP_ADDR_DATA2 and it's
> used as part of fuse writes. According to the driver code 8mq is
> compatible with 7d and this write path is enabled for imx8mq-ocotp.
After further digging in NXP manuals and uboot sources it seems that
imx8mq ocotp is like imx6 rather than imx7. Posted fix for nvmem driver:
https://patchwork.kernel.org/patch/10908081/
Reviewed-by: Leonard Crestez <leonard.crestez@nxp.com>
It might still be nice to find a way to identify imx8mq B0.
next prev parent reply other threads:[~2019-04-18 22:01 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-22 16:49 [RESEND v2] soc: imx: Add generic i.MX8 SoC driver Abel Vesa
2019-03-28 16:43 ` Leonard Crestez
2019-04-18 22:01 ` Leonard Crestez [this message]
2019-04-20 13:26 ` Shawn Guo
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