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ARM: imx: add i.MX7ULP SoC revision support

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i.MX7ULP SoC's revision info is inside the SIM module,
bit[31:28] of JTAG_ID register defines revision as below
from B0:

0001        B0
0010        B1

This patch adds SoC revision support for i.MX7ULP, test
result as below:

root@imx7ulp-evk ~$ cat /sys/devices/soc0/revision
2.1

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
This commit is contained in:
Anson Huang 2019-01-11 06:22:50 +00:00 committed by Shawn Guo
parent 6d45a4028c
commit 9edf908a16
1 changed files with 39 additions and 0 deletions
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39
arch/arm/mach-imx/mach-imx7ulp.c
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@ -6,18 +6,57 @@
*/
#include <linux/irqchip.h>
#include <linux/mfd/syscon.h>
#include <linux/of_platform.h>
#include <linux/regmap.h>
#include <asm/mach/arch.h>
#include "common.h"
#include "cpuidle.h"
#include "hardware.h"
#define SIM_JTAG_ID_REG 0x8c
static void __init imx7ulp_set_revision(void)
{
struct regmap *sim;
u32 revision;
sim = syscon_regmap_lookup_by_compatible("fsl,imx7ulp-sim");
if (IS_ERR(sim)) {
pr_warn("failed to find fsl,imx7ulp-sim regmap!\n");
return;
}
if (regmap_read(sim, SIM_JTAG_ID_REG, &revision)) {
pr_warn("failed to read sim regmap!\n");
return;
}
/*
* bit[31:28] of JTAG_ID register defines revision as below from B0:
* 0001 B0
* 0010 B1
*/
switch (revision >> 28) {
case 1:
imx_set_soc_revision(IMX_CHIP_REVISION_2_0);
break;
case 2:
imx_set_soc_revision(IMX_CHIP_REVISION_2_1);
break;
default:
imx_set_soc_revision(IMX_CHIP_REVISION_1_0);
break;
}
}
static void __init imx7ulp_init_machine(void)
{
imx7ulp_pm_init();
mxc_set_cpu_type(MXC_CPU_IMX7ULP);
imx7ulp_set_revision();
of_platform_default_populate(NULL, NULL, imx_soc_device_init());
}