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Fri, 14 Dec 2018 08:20:26 +0000 Received: from DB3PR0402MB3916.eurprd04.prod.outlook.com ([fe80::adf8:f49d:deb4:58fd]) by DB3PR0402MB3916.eurprd04.prod.outlook.com ([fe80::adf8:f49d:deb4:58fd%3]) with mapi id 15.20.1425.021; Fri, 14 Dec 2018 08:20:26 +0000 From: Anson Huang To: "shawnguo@kernel.org" , "s.hauer@pengutronix.de" , "kernel@pengutronix.de" , Fabio Estevam , "robh+dt@kernel.org" , "mark.rutland@arm.com" , "linux@armlinux.org.uk" , "linux-arm-kernel@lists.infradead.org" , "devicetree@vger.kernel.org" , "linux-kernel@vger.kernel.org" Subject: [PATCH 2/2] ARM: imx: add i.MX7ULP SoC revision support Thread-Topic: [PATCH 2/2] ARM: imx: add i.MX7ULP SoC revision support Thread-Index: AQHUk4Xd7cd4IKNeQkCChu5fxRF0KA== Date: Fri, 14 Dec 2018 08:20:26 +0000 Message-ID: <1544775260-25458-2-git-send-email-Anson.Huang@nxp.com> References: <1544775260-25458-1-git-send-email-Anson.Huang@nxp.com> In-Reply-To: <1544775260-25458-1-git-send-email-Anson.Huang@nxp.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: git-send-email 2.7.4 x-clientproxiedby: HK2PR04CA0071.apcprd04.prod.outlook.com (2603:1096:202:15::15) To DB3PR0402MB3916.eurprd04.prod.outlook.com (2603:10a6:8:10::18) authentication-results: spf=none (sender IP is ) smtp.mailfrom=anson.huang@nxp.com; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 --- arch/arm/mach-imx/mach-imx7ulp.c | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) diff --git a/arch/arm/mach-imx/mach-imx7ulp.c b/arch/arm/mach-imx/mach-imx7ulp.c index f7c9d01..95efb2d 100644 --- a/arch/arm/mach-imx/mach-imx7ulp.c +++ b/arch/arm/mach-imx/mach-imx7ulp.c @@ -6,18 +6,57 @@ */ #include +#include #include +#include #include #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()); } -- 2.7.4 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel