[PATCH v4 0/3] Add Amlogic secure monitor driver

[PATCH v4 0/3] Add Amlogic secure monitor driver

[Carlo Caione]

From: Carlo Caione <carlo-6IF/jdPJHihWk0Htik3J/w@public.gmane.org>


In the Amlogic SoCs the secure monitor calls are used for a lot of reasons:
interact with the NVMEM (efuses), check the reboot reason, set USB boot, ...

This driver defines a generic interface towards the secure monitor that can be
used by more specialized drivers to interact with the secure monitor itself
without worrying about bounce buffers managing.

Changelog:

v4:
  * Changed patches order
  * Removed now useless PATCH 2/4
  * Changed compatible to be SoC-specific
  * In the DT now we use SoC-agnostic IDs for the SMC functions. These IDs are
    traslated into SoC specific function IDs inside the driver
  * Added error checking on meson_sm_call() to retrieve the base address
  * Improved printing on errors

v3:
  * Moved driver to drivers/firmware
  * Added EXPORT_SYMBOL macros
  * Changed '_' in '-'
  * Introduced 'struct meson_sm_firmware' and 'meson_sm_get_fw()' to be used by
    drivers using the secure-monitor to enforce probe ordering

v2:
  * All the SMC function identifiers are now in a SoC-specific header file to
    be included by the DTS files so the SMC commands are now defined in the DT
    instead to be hardcoded into the driver
  * Patchset is no longer an RFC
  * Better error management and boundary checking
  * s/unsigned int/u32/
  * SMC call not only on CPU 0
  * Fix memory leaking
  * s/amlogic/meson/ in the directory names

Carlo Caione (3):
  firmware: Amlogic: Add secure monitor driver
  documentation: Add secure monitor binding documentation
  ARM64: dts: amlogic: gxbb: Enable secure monitor

 .../bindings/firmware/meson/meson_sm.txt           |  42 +++++
 arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi        |   9 +
 drivers/firmware/Kconfig                           |   1 +
 drivers/firmware/Makefile                          |   1 +
 drivers/firmware/meson/Kconfig                     |   8 +
 drivers/firmware/meson/Makefile                    |   1 +
 drivers/firmware/meson/meson_sm.c                  | 193 +++++++++++++++++++++
 include/dt-bindings/firmware/meson-sm.h            |  20 +++
 include/linux/firmware/meson/meson-sm.h            |  49 ++++++
 9 files changed, 324 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/firmware/meson/meson_sm.txt
 create mode 100644 drivers/firmware/meson/Kconfig
 create mode 100644 drivers/firmware/meson/Makefile
 create mode 100644 drivers/firmware/meson/meson_sm.c
 create mode 100644 include/dt-bindings/firmware/meson-sm.h
 create mode 100644 include/linux/firmware/meson/meson-sm.h

-- 
2.7.4

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[PATCH v4 1/3] firmware: Amlogic: Add secure monitor driver

[Carlo Caione]

From: Carlo Caione <carlo-6IF/jdPJHihWk0Htik3J/w@public.gmane.org>

Introduce a driver to provide calls into secure monitor mode.

In the Amlogic SoCs these calls are used for multiple reasons: access to
NVMEM, set USB boot, enable JTAG, etc...

Signed-off-by: Carlo Caione <carlo-6IF/jdPJHihWk0Htik3J/w@public.gmane.org>
---
 drivers/firmware/Kconfig                |   1 +
 drivers/firmware/Makefile               |   1 +
 drivers/firmware/meson/Kconfig          |   8 ++
 drivers/firmware/meson/Makefile         |   1 +
 drivers/firmware/meson/meson_sm.c       | 193 ++++++++++++++++++++++++++++++++
 include/dt-bindings/firmware/meson-sm.h |  20 ++++
 include/linux/firmware/meson/meson-sm.h |  49 ++++++++
 7 files changed, 273 insertions(+)
 create mode 100644 drivers/firmware/meson/Kconfig
 create mode 100644 drivers/firmware/meson/Makefile
 create mode 100644 drivers/firmware/meson/meson_sm.c
 create mode 100644 include/dt-bindings/firmware/meson-sm.h
 create mode 100644 include/linux/firmware/meson/meson-sm.h

diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig
index 6664f11..686e395 100644
--- a/drivers/firmware/Kconfig
+++ b/drivers/firmware/Kconfig
@@ -199,5 +199,6 @@ config HAVE_ARM_SMCCC
 source "drivers/firmware/broadcom/Kconfig"
 source "drivers/firmware/google/Kconfig"
 source "drivers/firmware/efi/Kconfig"
+source "drivers/firmware/meson/Kconfig"
 
 endmenu
diff --git a/drivers/firmware/Makefile b/drivers/firmware/Makefile
index 474bada..fc4bb09 100644
--- a/drivers/firmware/Makefile
+++ b/drivers/firmware/Makefile
@@ -21,6 +21,7 @@ obj-$(CONFIG_QCOM_SCM_32)	+= qcom_scm-32.o
 CFLAGS_qcom_scm-32.o :=$(call as-instr,.arch armv7-a\n.arch_extension sec,-DREQUIRES_SEC=1) -march=armv7-a
 
 obj-y				+= broadcom/
+obj-y				+= meson/
 obj-$(CONFIG_GOOGLE_FIRMWARE)	+= google/
 obj-$(CONFIG_EFI)		+= efi/
 obj-$(CONFIG_UEFI_CPER)		+= efi/
diff --git a/drivers/firmware/meson/Kconfig b/drivers/firmware/meson/Kconfig
new file mode 100644
index 0000000..fff11a3
--- /dev/null
+++ b/drivers/firmware/meson/Kconfig
@@ -0,0 +1,8 @@
+#
+# Amlogic Secure Monitor driver
+#
+config MESON_SM
+	bool
+	default ARCH_MESON
+	help
+	  Say y here to enable the Amlogic secure monitor driver
diff --git a/drivers/firmware/meson/Makefile b/drivers/firmware/meson/Makefile
new file mode 100644
index 0000000..9ab3884
--- /dev/null
+++ b/drivers/firmware/meson/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_MESON_SM) +=	meson_sm.o
diff --git a/drivers/firmware/meson/meson_sm.c b/drivers/firmware/meson/meson_sm.c
new file mode 100644
index 0000000..7f60248
--- /dev/null
+++ b/drivers/firmware/meson/meson_sm.c
@@ -0,0 +1,193 @@
+/*
+ * Amlogic Secure Monitor driver
+ *
+ * Copyright (C) 2016 Endless Mobile, Inc.
+ * Author: Carlo Caione <carlo-6IF/jdPJHihWk0Htik3J/w@public.gmane.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdarg.h>
+#include <asm/cacheflush.h>
+#include <asm/compiler.h>
+#include <linux/arm-smccc.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/smp.h>
+#include <linux/firmware/meson/meson-sm.h>
+
+#include <dt-bindings/firmware/meson-sm.h>
+
+struct meson_sm_chip gxbb_cmd = {
+	.mem_size		= 0x1000,
+	.cmd_sharemem_in_base	= 0x82000020,
+	.cmd_sharemem_out_base	= 0x82000021,
+	.cmd = {
+		CMD(SM_EFUSE_READ,	0x82000030),
+		CMD(SM_EFUSE_WRITE,	0x82000031),
+		CMD(SM_EFUSE_USER_MAX,	0x82000033),
+		{ /* sentinel */ },
+	},
+};
+
+static u32 meson_sm_get_cmd(const struct meson_sm_chip *chip, unsigned int cmd_index)
+{
+	unsigned int i;
+
+	for (i = 0; chip->cmd[i].smc_id; i++)
+		if (chip->cmd[i].index == cmd_index)
+			return chip->cmd[i].smc_id;
+
+	return 0;
+}
+
+static u32 __meson_sm_call(u32 cmd, u32 arg0, u32 arg1, u32 arg2, u32 arg3, u32 arg4)
+{
+	struct arm_smccc_res res;
+
+	arm_smccc_smc(cmd, arg0, arg1, arg2, arg3, arg4, 0, 0, &res);
+	return res.a0;
+}
+
+u32 meson_sm_call(struct meson_sm_firmware *fw, unsigned int cmd_index,
+		  u32 arg0, u32 arg1, u32 arg2, u32 arg3, u32 arg4)
+{
+	u32 cmd;
+
+	if (!fw)
+		return -EINVAL;
+
+	cmd = meson_sm_get_cmd(fw->chip, cmd_index);
+	if (!cmd)
+		return -EINVAL;
+
+	return __meson_sm_call(cmd, arg0, arg1, arg2, arg3, arg4);
+}
+EXPORT_SYMBOL(meson_sm_call);
+
+u32 meson_sm_call_read(struct meson_sm_firmware *fw, void *buffer,
+		       unsigned int cmd_index, u32 arg0, u32 arg1,
+		       u32 arg2, u32 arg3, u32 arg4)
+{
+	u32 size;
+
+	size = meson_sm_call(fw, cmd_index, arg0, arg1, arg2, arg3, arg4);
+	if (size <= 0 || size > fw->chip->mem_size)
+		return -EINVAL;
+
+	memcpy(buffer, fw->sm_sharemem_out_base, size);
+
+	return size;
+}
+EXPORT_SYMBOL(meson_sm_call_read);
+
+u32 meson_sm_call_write(struct meson_sm_firmware *fw, void *buffer,
+			unsigned int b_size, unsigned int cmd_index,
+			u32 arg0, u32 arg1, u32 arg2, u32 arg3, u32 arg4)
+{
+	u32 size;
+
+	if (b_size > fw->chip->mem_size)
+		return -EINVAL;
+
+	memcpy(fw->sm_sharemem_in_base, buffer, b_size);
+
+	size = meson_sm_call(fw, cmd_index, arg0, arg1, arg2, arg3, arg4);
+	if (size <= 0)
+		return -EINVAL;
+
+	return size;
+}
+EXPORT_SYMBOL(meson_sm_call_write);
+
+static int meson_sm_probe(struct platform_device *pdev)
+{
+	const struct meson_sm_chip *chip;
+	struct meson_sm_firmware *fw;
+	u32 sm_phy_in_base, sm_phy_out_base;
+
+	fw = devm_kzalloc(&pdev->dev, sizeof(*fw), GFP_KERNEL);
+	if (!fw)
+		return -ENOMEM;
+
+	fw->dev = &pdev->dev;
+
+	chip = of_device_get_match_data(fw->dev);
+	if (!chip) {
+		dev_err(fw->dev, "Unable to setup secure-monitor data\n");
+		return -ENODEV;
+	}
+
+	sm_phy_in_base = __meson_sm_call(chip->cmd_sharemem_in_base, 0, 0, 0, 0, 0);
+	if (!sm_phy_in_base) {
+		dev_err(fw->dev, "Failed to get shared input memory base \n");
+		return -EINVAL;
+	}
+
+	sm_phy_out_base = __meson_sm_call(chip->cmd_sharemem_out_base, 0, 0, 0, 0, 0);
+	if (!sm_phy_out_base) {
+		dev_err(fw->dev, "Failed to get shared output memory base\n");
+		return -EINVAL;
+	}
+
+	fw->sm_sharemem_in_base = ioremap_cache(sm_phy_in_base, chip->mem_size);
+	if (!fw->sm_sharemem_in_base) {
+		dev_err(fw->dev, "Failed iomap()\n");
+		return -EINVAL;
+	}
+
+	fw->sm_sharemem_out_base = ioremap_cache(sm_phy_out_base, chip->mem_size);
+	if (!fw->sm_sharemem_out_base) {
+		dev_err(fw->dev, "Failed iomap()\n");
+		iounmap(fw->sm_sharemem_in_base);
+		return -EINVAL;
+	}
+
+	fw->chip = chip;
+	platform_set_drvdata(pdev, fw);
+
+	dev_info(fw->dev, "secure-monitor enabled\n");
+
+	return 0;
+}
+
+struct meson_sm_firmware *meson_sm_get_fw(struct device_node *firmware_node)
+{
+	struct platform_device *pdev = of_find_device_by_node(firmware_node);
+
+	/*
+	 * Returns NULL is the firmware device is not ready.
+	 */
+	if (!pdev)
+		return NULL;
+
+	return platform_get_drvdata(pdev);
+}
+EXPORT_SYMBOL(meson_sm_get_fw);
+
+static const struct of_device_id meson_sm_ids[] = {
+	{ .compatible = "amlogic,meson-gxbb-sm", .data = &gxbb_cmd },
+	{ /* sentinel */},
+};
+MODULE_DEVICE_TABLE(of, meson_sm_ids);
+
+static struct platform_driver meson_sm_platform_driver = {
+	.probe	= meson_sm_probe,
+	.driver	= {
+		.name		= "secure-monitor",
+		.of_match_table	= meson_sm_ids,
+	},
+};
+module_platform_driver(meson_sm_platform_driver);
+
+MODULE_AUTHOR("Carlo Caione <carlo-6IF/jdPJHihWk0Htik3J/w@public.gmane.org>");
+MODULE_DESCRIPTION("Amlogic secure monitor driver");
+MODULE_LICENSE("GPL");
diff --git a/include/dt-bindings/firmware/meson-sm.h b/include/dt-bindings/firmware/meson-sm.h
new file mode 100644
index 0000000..3a52a13
--- /dev/null
+++ b/include/dt-bindings/firmware/meson-sm.h
@@ -0,0 +1,20 @@
+/*
+ * Copyright (C) 2016 Endless Mobile, Inc.
+ * Author: Carlo Caione <carlo-6IF/jdPJHihWk0Htik3J/w@public.gmane.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _MESON_DT_H_
+#define _MESON_DT_H_
+
+#define SM_EFUSE_READ		0
+#define SM_EFUSE_WRITE		1
+#define SM_EFUSE_USER_MAX	2
+
+#endif /* _MESON_DT_H_ */
diff --git a/include/linux/firmware/meson/meson-sm.h b/include/linux/firmware/meson/meson-sm.h
new file mode 100644
index 0000000..1589c97
--- /dev/null
+++ b/include/linux/firmware/meson/meson-sm.h
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2016 Endless Mobile, Inc.
+ * Author: Carlo Caione <carlo-6IF/jdPJHihWk0Htik3J/w@public.gmane.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _MESON_SM_H_
+#define _MESON_SM_H_
+
+#include <linux/types.h>
+#include <linux/of_device.h>
+
+struct meson_sm_cmd {
+	unsigned int index;
+	u32 smc_id;
+};
+#define CMD(d, s) { .index = (d), .smc_id = (s), }
+
+struct meson_sm_chip {
+	unsigned int mem_size;
+	u32 cmd_sharemem_in_base;
+	u32 cmd_sharemem_out_base;
+	struct meson_sm_cmd cmd[];
+};
+
+struct meson_sm_firmware {
+	struct device *dev;
+	const struct meson_sm_chip *chip;
+	void __iomem *sm_sharemem_in_base;
+	void __iomem *sm_sharemem_out_base;
+};
+
+u32 meson_sm_call(struct meson_sm_firmware *fw, unsigned int cmd_index,
+		  u32 arg0, u32 arg1, u32 arg2, u32 arg3, u32 arg4);
+u32 meson_sm_call_write(struct meson_sm_firmware *fw, void *buffer,
+			unsigned int b_size, unsigned int cmd_index,
+			u32 arg0, u32 arg1, u32 arg2, u32 arg3, u32 arg4);
+u32 meson_sm_call_read(struct meson_sm_firmware *fw, void *buffer,
+		       unsigned int cmd_index, u32 arg0, u32 arg1,
+		       u32 arg2, u32 arg3, u32 arg4);
+struct meson_sm_firmware *meson_sm_get_fw(struct device_node *firmware_node);
+
+#endif /* _MESON_SM_H_ */
-- 
2.7.4

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Re: [PATCH v4 1/3] firmware: Amlogic: Add secure monitor driver

[Neil Armstrong]

Hi Carlo,

On 05/25/2016 10:18 PM, Carlo Caione wrote:
> diff --git a/include/dt-bindings/firmware/meson-sm.h b/include/dt-bindings/firmware/meson-sm.h
> new file mode 100644
> index 0000000..3a52a13
> --- /dev/null
> +++ b/include/dt-bindings/firmware/meson-sm.h
> @@ -0,0 +1,20 @@
> +/*
> + * Copyright (C) 2016 Endless Mobile, Inc.
> + * Author: Carlo Caione <carlo-6IF/jdPJHihWk0Htik3J/w@public.gmane.org>
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License
> + * version 2 as published by the Free Software Foundation.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program. If not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#ifndef _MESON_DT_H_
> +#define _MESON_DT_H_
> +
> +#define SM_EFUSE_READ		0
> +#define SM_EFUSE_WRITE		1
> +#define SM_EFUSE_USER_MAX	2
> +
> +#endif /* _MESON_DT_H_ */

Now this has been refactored, I don't see the point of this dt-bindings header ?

These defines should take place in linux/firmware/meson/meson-sm.h

Neil
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Re: [PATCH v4 1/3] firmware: Amlogic: Add secure monitor driver

[Carlo Caione]

On 26/05/16 09:17, Neil Armstrong wrote:
> Hi Carlo,

Hi Neil,

> On 05/25/2016 10:18 PM, Carlo Caione wrote:
> > diff --git a/include/dt-bindings/firmware/meson-sm.h b/include/dt-bindings/firmware/meson-sm.h
> > new file mode 100644
> > index 0000000..3a52a13
> > --- /dev/null
> > +++ b/include/dt-bindings/firmware/meson-sm.h
> > @@ -0,0 +1,20 @@
> > +/*
> > + * Copyright (C) 2016 Endless Mobile, Inc.
> > + * Author: Carlo Caione <carlo-6IF/jdPJHihWk0Htik3J/w@public.gmane.org>
> > + *
> > + * This program is free software; you can redistribute it and/or
> > + * modify it under the terms of the GNU General Public License
> > + * version 2 as published by the Free Software Foundation.
> > + *
> > + * You should have received a copy of the GNU General Public License
> > + * along with this program. If not, see <http://www.gnu.org/licenses/>.
> > + */
> > +
> > +#ifndef _MESON_DT_H_
> > +#define _MESON_DT_H_
> > +
> > +#define SM_EFUSE_READ		0
> > +#define SM_EFUSE_WRITE		1
> > +#define SM_EFUSE_USER_MAX	2
> > +
> > +#endif /* _MESON_DT_H_ */
> 
> Now this has been refactored, I don't see the point of this dt-bindings header ?
> 
> These defines should take place in linux/firmware/meson/meson-sm.h

Yes, that is a possibility I considered before submitting this version
and now it also seems probably the best way to do it. I'll change it in
the next revision.

Thanks,

-- 
Carlo Caione
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[PATCH v4 2/3] documentation: Add secure monitor binding documentation

[Carlo Caione]

From: Carlo Caione <carlo-6IF/jdPJHihWk0Htik3J/w@public.gmane.org>

Add the binding documentation for the Amlogic secure monitor driver.

Signed-off-by: Carlo Caione <carlo-6IF/jdPJHihWk0Htik3J/w@public.gmane.org>
---
 .../bindings/firmware/meson/meson_sm.txt           | 42 ++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/firmware/meson/meson_sm.txt

diff --git a/Documentation/devicetree/bindings/firmware/meson/meson_sm.txt b/Documentation/devicetree/bindings/firmware/meson/meson_sm.txt
new file mode 100644
index 0000000..896758d
--- /dev/null
+++ b/Documentation/devicetree/bindings/firmware/meson/meson_sm.txt
@@ -0,0 +1,42 @@
+* Amlogic Secure Monitor
+
+In the Amlogic SoCs the Secure Monitor code is used to provide access to the
+NVMEM, enable JTAG, set USB boot, etc...
+
+Required properties for the secure monitor node:
+- compatible: Should be "amlogic,meson-gxbb-sm"
+
+Example:
+
+	#include <dt-bindings/firmware/meson-sm.h>
+
+	...
+
+	firmware {
+		compatible = "simple-bus";
+
+		sm: secure-monitor {
+			compatible = "amlogic,meson-gxbb-sm";
+		};
+	};
+
+Node of a device using the secure monitor must have a custom property to
+specify the SMC32 function ID the driver is going to use.
+
+Example of the node using the secure monitor:
+
+	#include <dt-bindings/firmware/meson-sm.h>
+
+	...
+
+	efuse: efuse {
+		compatible = "amlogic,meson-gxbb-efuse";
+		secure-monitor = <&sm>;
+		amlogic,sm-cmd-read-efuse = <SM_EFUSE_READ>;
+		amlogic,sm-cmd-max-efuse = <SM_EFUSE_USER_MAX>;
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		...
+	};
+
-- 
2.7.4

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Re: [PATCH v4 2/3] documentation: Add secure monitor binding documentation

[Neil Armstrong]

Hi Carlo,

On 05/25/2016 10:18 PM, Carlo Caione wrote:
> From: Carlo Caione <carlo-6IF/jdPJHihWk0Htik3J/w@public.gmane.org>
> 
> Add the binding documentation for the Amlogic secure monitor driver.
> 
> Signed-off-by: Carlo Caione <carlo-6IF/jdPJHihWk0Htik3J/w@public.gmane.org>
> ---
>  .../bindings/firmware/meson/meson_sm.txt           | 42 ++++++++++++++++++++++
>  1 file changed, 42 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/firmware/meson/meson_sm.txt
> 
> diff --git a/Documentation/devicetree/bindings/firmware/meson/meson_sm.txt b/Documentation/devicetree/bindings/firmware/meson/meson_sm.txt
> new file mode 100644
> index 0000000..896758d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/firmware/meson/meson_sm.txt
> @@ -0,0 +1,42 @@
> +* Amlogic Secure Monitor
> +
> +In the Amlogic SoCs the Secure Monitor code is used to provide access to the
> +NVMEM, enable JTAG, set USB boot, etc...
> +
> +Required properties for the secure monitor node:
> +- compatible: Should be "amlogic,meson-gxbb-sm"
> +
> +Example:
> +
> +	#include <dt-bindings/firmware/meson-sm.h>
> +
> +	...
> +
> +	firmware {
> +		compatible = "simple-bus";
> +
> +		sm: secure-monitor {
> +			compatible = "amlogic,meson-gxbb-sm";
> +		};
> +	};
> +
> +Node of a device using the secure monitor must have a custom property to
> +specify the SMC32 function ID the driver is going to use.
> +
> +Example of the node using the secure monitor:
> +
> +	#include <dt-bindings/firmware/meson-sm.h>
> +
> +	...
> +
> +	efuse: efuse {
> +		compatible = "amlogic,meson-gxbb-efuse";
> +		secure-monitor = <&sm>;
> +		amlogic,sm-cmd-read-efuse = <SM_EFUSE_READ>;
> +		amlogic,sm-cmd-max-efuse = <SM_EFUSE_USER_MAX>;

Same here, since the compatible is "gxbb" specific, there is no need for these properties, and so no need for the dt-bindings header.

> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +
> +		...
> +	};
> +
> 

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[PATCH v4 3/3] ARM64: dts: amlogic: gxbb: Enable secure monitor

[Carlo Caione]

From: Carlo Caione <carlo-6IF/jdPJHihWk0Htik3J/w@public.gmane.org>

Add the secure monitor node in the Amlogic Meson GXBB DTSI file to
enable it.

Signed-off-by: Carlo Caione <carlo-6IF/jdPJHihWk0Htik3J/w@public.gmane.org>
---
 arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi b/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
index 76b3b6d..735a751 100644
--- a/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
+++ b/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
@@ -44,6 +44,7 @@
 #include <dt-bindings/interrupt-controller/irq.h>
 #include <dt-bindings/interrupt-controller/arm-gic.h>
 #include <dt-bindings/gpio/meson-gxbb-gpio.h>
+#include <dt-bindings/firmware/meson-sm.h>
 
 / {
 	compatible = "amlogic,meson-gxbb";
@@ -98,6 +99,14 @@
 		method = "smc";
 	};
 
+	firmware {
+		compatible = "simple-bus";
+
+		sm: secure-monitor {
+			compatible = "amlogic,meson-gxbb-sm";
+		};
+	};
+
 	timer {
 		compatible = "arm,armv8-timer";
 		interrupts = <GIC_PPI 13
-- 
2.7.4

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