linux-kernel - [PATCH 1/2] soc: imx8: Using existing serial

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Message-Id: <1571986583-21138-1-git-send-email-Anson.Huang@nxp.com>
Date:   Fri, 25 Oct 2019 14:56:22 +0800
From:   Anson Huang <Anson.Huang@....com>
To:     shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        festevam@...il.com, daniel.baluta@....com, aisheng.dong@....com,
        abel.vesa@....com, leonard.crestez@....com,
        viresh.kumar@...aro.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Cc:     Linux-imx@....com
Subject: [PATCH 1/2] soc: imx8: Using existing serial_number instead of UID

The soc_device_attribute structure already contains a serial_number
attribute to show SoC's unique ID, just use it to show SoC's unique
ID instead of creating a new file called soc_uid.

Signed-off-by: Anson Huang <Anson.Huang@....com>
---
 drivers/soc/imx/soc-imx8.c | 23 +++++++++--------------
 1 file changed, 9 insertions(+), 14 deletions(-)

diff --git a/drivers/soc/imx/soc-imx8.c b/drivers/soc/imx/soc-imx8.c
index b9831576..fcbf745 100644
--- a/drivers/soc/imx/soc-imx8.c
+++ b/drivers/soc/imx/soc-imx8.c
@@ -29,14 +29,6 @@ struct imx8_soc_data {
 
 static u64 soc_uid;
 
-static ssize_t soc_uid_show(struct device *dev,
-			    struct device_attribute *attr, char *buf)
-{
-	return sprintf(buf, "%016llX\n", soc_uid);
-}
-
-static DEVICE_ATTR_RO(soc_uid);
-
 static u32 __init imx8mq_soc_revision(void)
 {
 	struct device_node *np;
@@ -174,22 +166,25 @@ static int __init imx8_soc_init(void)
 		goto free_soc;
 	}
 
+	soc_dev_attr->serial_number = kasprintf(GFP_KERNEL, "%016llX", soc_uid);
+	if (!soc_dev_attr->serial_number) {
+		ret = -ENOMEM;
+		goto free_rev;
+	}
+
 	soc_dev = soc_device_register(soc_dev_attr);
 	if (IS_ERR(soc_dev)) {
 		ret = PTR_ERR(soc_dev);
-		goto free_rev;
+		goto free_serial_number;
 	}
 
-	ret = device_create_file(soc_device_to_device(soc_dev),
-				 &dev_attr_soc_uid);
-	if (ret)
-		goto free_rev;
-
 	if (IS_ENABLED(CONFIG_ARM_IMX_CPUFREQ_DT))
 		platform_device_register_simple("imx-cpufreq-dt", -1, NULL, 0);
 
 	return 0;
 
+free_serial_number:
+	kfree(soc_dev_attr->serial_number);
 free_rev:
 	if (strcmp(soc_dev_attr->revision, "unknown"))
 		kfree(soc_dev_attr->revision);
-- 
2.7.4