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From:   Abel Vesa <abel.vesa@nxp.com>
To:     Shawn Guo <shawnguo@kernel.org>,
        Sascha Hauer <kernel@pengutronix.de>,
        Fabio Estevam <fabio.estevam@nxp.com>,
        Stefan Agner <stefan@agner.ch>,
        Chris Spencer <spencercw@gmail.com>,
        Lucas Stach <l.stach@pengutronix.de>,
        Rob Herring <robh@kernel.org>, Abel Vesa <abelvesa@linux.com>
CC:     dl-linux-imx <linux-imx@nxp.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        "linux-arm-kernel@lists.infradead.org" 
        <linux-arm-kernel@lists.infradead.org>,
        Abel Vesa <abel.vesa@nxp.com>
Subject: [PATCH v2] soc: imx: Add generic i.MX8 SoC driver
Thread-Topic: [PATCH v2] soc: imx: Add generic i.MX8 SoC driver
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Date:   Tue, 26 Feb 2019 10:53:27 +0000
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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'.

Signed-off-by: Abel Vesa <abel.vesa@nxp.com>
---

Changes since v1:                                                          =
 =20
 * added the of_node_put on free_soc failure as suggested by Stefan Agner.
 * made imx8mq_soc_data const as suggested by Stefan Agner.
 * also made the imx8mq_soc_data static
 * marked imx8mq_soc_revision as __init
 * changed the revision read-out from anatop to ocotp since the rev B1
   is specified in there. For now, for i.MX8MQ only revision B1 is supporte=
d.
   For any other revision, it will print the revision as unknown.

 drivers/soc/imx/Makefile   |   1 +
 drivers/soc/imx/soc-imx8.c | 115 +++++++++++++++++++++++++++++++++++++++++=
++++
 2 files changed, 116 insertions(+)
 create mode 100644 drivers/soc/imx/soc-imx8.c

diff --git a/drivers/soc/imx/Makefile b/drivers/soc/imx/Makefile
index 506a6f3..d6b529e0 100644
--- a/drivers/soc/imx/Makefile
+++ b/drivers/soc/imx/Makefile
@@ -1,2 +1,3 @@
 obj-$(CONFIG_HAVE_IMX_GPC) +=3D gpc.o
 obj-$(CONFIG_IMX_GPCV2_PM_DOMAINS) +=3D gpcv2.o
+obj-$(CONFIG_ARCH_MXC) +=3D soc-imx8.o
diff --git a/drivers/soc/imx/soc-imx8.c b/drivers/soc/imx/soc-imx8.c
new file mode 100644
index 0000000..fc6429f
--- /dev/null
+++ b/drivers/soc/imx/soc-imx8.c
@@ -0,0 +1,115 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2019 NXP.
+ */
+
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/of_address.h>
+#include <linux/slab.h>
+#include <linux/sys_soc.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+
+#define REV_B1				0x21
+
+#define IMX8MQ_SW_INFO_B1		0x40
+#define IMX8MQ_SW_MAGIC_B1		0xff0055aa
+
+struct imx8_soc_data {
+	char *name;
+	u32 (*soc_revision)(void);
+};
+
+static u32 __init imx8mq_soc_revision(void)
+{
+	struct device_node *np;
+	void __iomem *ocotp_base;
+	u32 magic;
+	u32 rev =3D 0;
+
+	np =3D of_find_compatible_node(NULL, NULL, "fsl,imx8mq-ocotp");
+	if (!np)
+		goto out;
+
+	ocotp_base =3D of_iomap(np, 0);
+	WARN_ON(!ocotp_base);
+
+	magic =3D readl_relaxed(ocotp_base + IMX8MQ_SW_INFO_B1);
+	if (magic =3D=3D IMX8MQ_SW_MAGIC_B1)
+		rev =3D REV_B1;
+
+	iounmap(ocotp_base);
+
+out:
+	of_node_put(np);
+	return rev;
+}
+
+static const struct imx8_soc_data imx8mq_soc_data =3D {
+	.name =3D "i.MX8MQ",
+	.soc_revision =3D imx8mq_soc_revision,
+};
+
+static const struct of_device_id imx8_soc_match[] =3D {
+	{ .compatible =3D "fsl,imx8mq", .data =3D &imx8mq_soc_data, },
+	{ }
+};
+
+#define imx8_revision(soc_rev) \
+	soc_rev ? \
+	kasprintf(GFP_KERNEL, "%d.%d", (soc_rev >> 4) & 0xf,  soc_rev & 0xf) : \
+	"unknown"
+
+static int __init imx8_soc_init(void)
+{
+	struct soc_device_attribute *soc_dev_attr;
+	struct soc_device *soc_dev;
+	struct device_node *root;
+	const struct of_device_id *id;
+	u32 soc_rev =3D 0;
+	const struct imx8_soc_data *data;
+	int ret;
+
+	soc_dev_attr =3D kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
+	if (!soc_dev_attr)
+		return -ENODEV;
+
+	soc_dev_attr->family =3D "Freescale i.MX";
+
+	root =3D of_find_node_by_path("/");
+	ret =3D of_property_read_string(root, "model", &soc_dev_attr->machine);
+	if (ret)
+		goto free_soc;
+
+	id =3D of_match_node(imx8_soc_match, root);
+	if (!id)
+		goto free_soc;
+
+	of_node_put(root);
+
+	data =3D id->data;
+	if (data) {
+		soc_dev_attr->soc_id =3D data->name;
+		if (data->soc_revision)
+			soc_rev =3D data->soc_revision();
+	}
+
+	soc_dev_attr->revision =3D imx8_revision(soc_rev);
+	if (!soc_dev_attr->revision)
+		goto free_soc;
+
+	soc_dev =3D soc_device_register(soc_dev_attr);
+	if (IS_ERR(soc_dev))
+		goto free_rev;
+
+	return 0;
+
+free_rev:
+	kfree(soc_dev_attr->revision);
+free_soc:
+	kfree(soc_dev_attr);
+	of_node_put(root);
+	return -ENODEV;
+}
+device_initcall(imx8_soc_init);
--=20
2.7.4