diff options
Diffstat (limited to 'arch/arm/mach-imx')
| -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()); } |