[PATCH 5/5] ARM: imx6: report soc info via soc device
Shawn Guo
shawn.guo at linaro.org
Wed Sep 25 04:30:23 EDT 2013
The patch enables soc bus infrastructure and adds a function
imx_soc_device_init() to report soc info via soc device interface for
imx6qdl and imx6sl. With the support, user space can get soc related
info by looking at sysfs like below.
$ cat /sys/devices/soc0/machine
Freescale i.MX6 Quad SABRE Smart Device Board
$ cat /sys/devices/soc0/family
Freescale i.MX
$ cat /sys/devices/soc0/soc_id
i.MX6Q
$ cat /sys/devices/soc0/revision
1.2
Signed-off-by: Shawn Guo <shawn.guo at linaro.org>
---
arch/arm/mach-imx/Kconfig | 1 +
arch/arm/mach-imx/common.h | 1 +
arch/arm/mach-imx/cpu.c | 81 +++++++++++++++++++++++++++++++++++++++
arch/arm/mach-imx/mach-imx6q.c | 8 +++-
arch/arm/mach-imx/mach-imx6sl.c | 8 +++-
arch/arm/mach-imx/mxc.h | 1 +
6 files changed, 98 insertions(+), 2 deletions(-)
diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig
index 9f67338..e017915 100644
--- a/arch/arm/mach-imx/Kconfig
+++ b/arch/arm/mach-imx/Kconfig
@@ -11,6 +11,7 @@ config ARCH_MXC
select GENERIC_IRQ_CHIP
select MIGHT_HAVE_CACHE_L2X0 if ARCH_MULTI_V6_V7
select MULTI_IRQ_HANDLER
+ select SOC_BUS
select SPARSE_IRQ
select USE_OF
help
diff --git a/arch/arm/mach-imx/common.h b/arch/arm/mach-imx/common.h
index 282af93..4f9aea9 100644
--- a/arch/arm/mach-imx/common.h
+++ b/arch/arm/mach-imx/common.h
@@ -83,6 +83,7 @@ extern int mxc_device_init(void);
void imx_set_soc_revision(unsigned int rev);
unsigned int imx_get_soc_revision(void);
void imx_init_revision_from_anatop(void);
+struct device *imx_soc_device_init(void);
enum mxc_cpu_pwr_mode {
WAIT_CLOCKED, /* wfi only */
diff --git a/arch/arm/mach-imx/cpu.c b/arch/arm/mach-imx/cpu.c
index 51f6c51..fae2c9a 100644
--- a/arch/arm/mach-imx/cpu.c
+++ b/arch/arm/mach-imx/cpu.c
@@ -1,6 +1,9 @@
#include <linux/module.h>
#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+#include <linux/sys_soc.h>
#include "hardware.h"
#include "common.h"
@@ -56,3 +59,81 @@ void __init imx_set_aips(void __iomem *base)
reg = __raw_readl(base + 0x50) & 0x00FFFFFF;
__raw_writel(reg, base + 0x50);
}
+
+struct device * __init imx_soc_device_init(void)
+{
+ struct soc_device_attribute *soc_dev_attr;
+ struct soc_device *soc_dev;
+ struct device_node *root;
+ const char *soc_id;
+ int ret;
+
+ soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
+ if (!soc_dev_attr)
+ return NULL;
+
+ soc_dev_attr->family = "Freescale i.MX";
+
+ root = of_find_node_by_path("/");
+ ret = of_property_read_string(root, "model", &soc_dev_attr->machine);
+ of_node_put(root);
+ if (ret)
+ goto free_soc;
+
+ switch (__mxc_cpu_type) {
+ case MXC_CPU_MX1:
+ soc_id = "i.MX1";
+ break;
+ case MXC_CPU_MX21:
+ soc_id = "i.MX21";
+ break;
+ case MXC_CPU_MX25:
+ soc_id = "i.MX25";
+ break;
+ case MXC_CPU_MX27:
+ soc_id = "i.MX27";
+ break;
+ case MXC_CPU_MX31:
+ soc_id = "i.MX31";
+ break;
+ case MXC_CPU_MX35:
+ soc_id = "i.MX35";
+ break;
+ case MXC_CPU_MX51:
+ soc_id = "i.MX51";
+ break;
+ case MXC_CPU_MX53:
+ soc_id = "i.MX53";
+ break;
+ case MXC_CPU_IMX6SL:
+ soc_id = "i.MX6SL";
+ break;
+ case MXC_CPU_IMX6DL:
+ soc_id = "i.MX6DL";
+ break;
+ case MXC_CPU_IMX6Q:
+ soc_id = "i.MX6Q";
+ break;
+ default:
+ soc_id = "Unknown";
+ }
+ soc_dev_attr->soc_id = soc_id;
+
+ soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%d.%d",
+ (imx_soc_revision >> 4) & 0xf,
+ imx_soc_revision & 0xf);
+ if (!soc_dev_attr->revision)
+ goto free_soc;
+
+ soc_dev = soc_device_register(soc_dev_attr);
+ if (IS_ERR(soc_dev))
+ goto free_rev;
+
+ return soc_device_to_device(soc_dev);
+
+free_rev:
+ kfree(soc_dev_attr->revision);
+free_soc:
+ kfree(soc_dev_attr);
+ return NULL;
+}
diff --git a/arch/arm/mach-imx/mach-imx6q.c b/arch/arm/mach-imx/mach-imx6q.c
index ea01ac3..ebcfd8d 100644
--- a/arch/arm/mach-imx/mach-imx6q.c
+++ b/arch/arm/mach-imx/mach-imx6q.c
@@ -164,9 +164,15 @@ static void __init imx6q_1588_init(void)
static void __init imx6q_init_machine(void)
{
+ struct device *parent;
+
+ parent = imx_soc_device_init();
+ if (parent == NULL)
+ pr_warn("failed to initialize soc device\n");
+
imx6q_enet_phy_init();
- of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
+ of_platform_populate(NULL, of_default_bus_match_table, NULL, parent);
imx_anatop_init();
imx6q_pm_init();
diff --git a/arch/arm/mach-imx/mach-imx6sl.c b/arch/arm/mach-imx/mach-imx6sl.c
index b1aaa47..5c767f0 100644
--- a/arch/arm/mach-imx/mach-imx6sl.c
+++ b/arch/arm/mach-imx/mach-imx6sl.c
@@ -37,9 +37,15 @@ static void __init imx6sl_fec_init(void)
static void __init imx6sl_init_machine(void)
{
+ struct device *parent;
+
mxc_arch_reset_init_dt();
- of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
+ parent = imx_soc_device_init();
+ if (parent == NULL)
+ pr_warn("failed to initialize soc device\n");
+
+ of_platform_populate(NULL, of_default_bus_match_table, NULL, parent);
imx6sl_fec_init();
}
diff --git a/arch/arm/mach-imx/mxc.h b/arch/arm/mach-imx/mxc.h
index 8629e5b..99e03ea 100644
--- a/arch/arm/mach-imx/mxc.h
+++ b/arch/arm/mach-imx/mxc.h
@@ -34,6 +34,7 @@
#define MXC_CPU_MX35 35
#define MXC_CPU_MX51 51
#define MXC_CPU_MX53 53
+#define MXC_CPU_IMX6SL 0x60
#define MXC_CPU_IMX6DL 0x61
#define MXC_CPU_IMX6Q 0x63
--
1.7.9.5
More information about the linux-arm-kernel
mailing list