diff options
| author | Anson Huang <anson.huang@nxp.com> | 2019-01-11 09:22:50 +0300 |
|---|---|---|
| committer | Shawn Guo <shawnguo@kernel.org> | 2019-01-16 04:36:07 +0300 |
| commit | 9edf908a16c43c438f0edc08ce839c5a7ef7d039 (patch) | |
| tree | 7b625608284f336691b73034f663135f2d3c5715 | |
| parent | 6d45a4028c8a6bc0a1e92438283ef7d4ed6ffe71 (diff) | |
| download | linux-9edf908a16c43c438f0edc08ce839c5a7ef7d039.tar.xz | |
ARM: imx: add i.MX7ULP SoC revision support
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>
| -rw-r--r-- | arch/arm/mach-imx/mach-imx7ulp.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/arch/arm/mach-imx/mach-imx7ulp.c b/arch/arm/mach-imx/mach-imx7ulp.c index 19c5b3050cb9..11ac71aaf965 100644 --- a/arch/arm/mach-imx/mach-imx7ulp.c +++ b/arch/arm/mach-imx/mach-imx7ulp.c @@ -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()); } |