linux-kernel - RE: [PATCH V3] soc: imx-scu: Add SoC UID(unique identifier) support

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Date:   Tue, 6 Aug 2019 06:04:32 +0000
From:   Anson Huang <anson.huang@....com>
To:     Shawn Guo <shawnguo@...nel.org>,
        Marco Felsch <m.felsch@...gutronix.de>
CC:     "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        Aisheng Dong <aisheng.dong@....com>,
        Abel Vesa <abel.vesa@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH V3] soc: imx-scu: Add SoC UID(unique identifier) support

Hi, Marco
	Are you OK with this patch?

Thanks,
Anson.

> On Tue, Jul 02, 2019 at 03:45:45PM +0800, Anson.Huang@....com wrote:
> > From: Anson Huang <Anson.Huang@....com>
> >
> > Add i.MX SCU SoC's UID(unique identifier) support, user can read it
> > from sysfs:
> >
> > root@...8qxpmek:~# cat /sys/devices/soc0/soc_uid
> > 7B64280B57AC1898
> >
> > Signed-off-by: Anson Huang <Anson.Huang@....com>
> > Reviewed-by: Daniel Baluta <daniel.baluta@....com>
> 
> @Marco, are you happy with it?
> 
> Shawn
> 
> > ---
> > Change since V2:
> > 	- The SCU FW API for getting UID does NOT have response, so we
> should set
> > 	  imx_scu_call_rpc()'s 3rd parameter as false and still can check the
> returned
> > 	  value, and comment is no needed any more.
> > ---
> >  drivers/soc/imx/soc-imx-scu.c | 39
> > +++++++++++++++++++++++++++++++++++++++
> >  1 file changed, 39 insertions(+)
> >
> > diff --git a/drivers/soc/imx/soc-imx-scu.c
> > b/drivers/soc/imx/soc-imx-scu.c index 676f612..50831eb 100644
> > --- a/drivers/soc/imx/soc-imx-scu.c
> > +++ b/drivers/soc/imx/soc-imx-scu.c
> > @@ -27,6 +27,40 @@ struct imx_sc_msg_misc_get_soc_id {
> >  	} data;
> >  } __packed;
> >
> > +struct imx_sc_msg_misc_get_soc_uid {
> > +	struct imx_sc_rpc_msg hdr;
> > +	u32 uid_low;
> > +	u32 uid_high;
> > +} __packed;
> > +
> > +static ssize_t soc_uid_show(struct device *dev,
> > +			    struct device_attribute *attr, char *buf) {
> > +	struct imx_sc_msg_misc_get_soc_uid msg;
> > +	struct imx_sc_rpc_msg *hdr = &msg.hdr;
> > +	u64 soc_uid;
> > +	int ret;
> > +
> > +	hdr->ver = IMX_SC_RPC_VERSION;
> > +	hdr->svc = IMX_SC_RPC_SVC_MISC;
> > +	hdr->func = IMX_SC_MISC_FUNC_UNIQUE_ID;
> > +	hdr->size = 1;
> > +
> > +	ret = imx_scu_call_rpc(soc_ipc_handle, &msg, false);
> > +	if (ret) {
> > +		pr_err("%s: get soc uid failed, ret %d\n", __func__, ret);
> > +		return ret;
> > +	}
> > +
> > +	soc_uid = msg.uid_high;
> > +	soc_uid <<= 32;
> > +	soc_uid |= msg.uid_low;
> > +
> > +	return sprintf(buf, "%016llX\n", soc_uid); }
> > +
> > +static DEVICE_ATTR_RO(soc_uid);
> > +
> >  static int imx_scu_soc_id(void)
> >  {
> >  	struct imx_sc_msg_misc_get_soc_id msg; @@ -102,6 +136,11 @@
> static
> > int imx_scu_soc_probe(struct platform_device *pdev)
> >  		goto free_revision;
> >  	}
> >
> > +	ret = device_create_file(soc_device_to_device(soc_dev),
> > +				 &dev_attr_soc_uid);
> > +	if (ret)
> > +		goto free_revision;
> > +
> >  	return 0;
> >
> >  free_revision:
> > --
> > 2.7.4
> >