From patchwork Wed Jan 11 11:44:29 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Siddharth Vadapalli X-Patchwork-Id: 13096514 X-Patchwork-Delegate: kuba@kernel.org Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 872DAC5479D for ; Wed, 11 Jan 2023 11:49:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233517AbjAKLtb (ORCPT ); Wed, 11 Jan 2023 06:49:31 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48030 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238743AbjAKLrn (ORCPT ); Wed, 11 Jan 2023 06:47:43 -0500 Received: from lelv0142.ext.ti.com (lelv0142.ext.ti.com [198.47.23.249]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B221BEE00; Wed, 11 Jan 2023 03:45:10 -0800 (PST) Received: from lelv0266.itg.ti.com ([10.180.67.225]) by lelv0142.ext.ti.com (8.15.2/8.15.2) with ESMTP id 30BBj19h030754; Wed, 11 Jan 2023 05:45:01 -0600 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1673437501; bh=gsE4XZA6NpAH7Ib8hRW4+ivUA6rjtiQonN9LPKstIHs=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=o6A4OWfA2BlLYuN78JCu1jXn99wM9zuxMvtfd9GFGv3jiRxQ4bAduHY1Ey5TJV+yL RMdIoyXRKM30JDwVRtJH422pHH3QtQ42CHGTXRX2OuYlRUH8c8Ge6WUGPkQ1zh1eM1 7OMQsxg0/llmwMwzW1kRm+zPadvsetyhxVlN9634= Received: from DFLE113.ent.ti.com (dfle113.ent.ti.com [10.64.6.34]) by lelv0266.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 30BBj1xN079394 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Wed, 11 Jan 2023 05:45:01 -0600 Received: from DFLE102.ent.ti.com (10.64.6.23) by DFLE113.ent.ti.com (10.64.6.34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.16; Wed, 11 Jan 2023 05:45:00 -0600 Received: from lelv0327.itg.ti.com (10.180.67.183) by DFLE102.ent.ti.com (10.64.6.23) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.16 via Frontend Transport; Wed, 11 Jan 2023 05:45:00 -0600 Received: from uda0492258.dhcp.ti.com (ileaxei01-snat.itg.ti.com [10.180.69.5]) by lelv0327.itg.ti.com (8.15.2/8.15.2) with ESMTP id 30BBiUkM093892; Wed, 11 Jan 2023 05:44:56 -0600 From: Siddharth Vadapalli To: , , , , , , , , , , , CC: , , , , , Subject: [PATCH net-next 5/5] arm64: dts: ti: k3-am625-sk: Add cpsw3g cpts PPS support Date: Wed, 11 Jan 2023 17:14:29 +0530 Message-ID: <20230111114429.1297557-6-s-vadapalli@ti.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230111114429.1297557-1-s-vadapalli@ti.com> References: <20230111114429.1297557-1-s-vadapalli@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org The CPTS driver is capable of configuring GENFy (Periodic Signal Generator Function) present in the CPTS module, to generate periodic output signals with a custom time period. In order to generate a PPS signal on the GENFy output, the device-tree property "ti,pps" has to be used. The "ti,pps" property is used to declare the mapping between the CPTS HWx_TS_PUSH (Hardware Timestamp trigger) input and the GENFy output that is configured to generate a PPS signal. The mapping is of the form: where the value x corresponds to HWx_TS_PUSH input (1-based indexing) and the value y corresponds to GENFy (0-based indexing). To verify that the signal is a PPS signal, the GENFy output signal is fed into the CPTS HWx_TS_PUSH input, which generates a timestamp event on the rising edge of the GENFy signal. The GENFy output signal can be routed to the HWx_TS_PUSH input by using the Time Sync Router. This is done by mentioning the mapping between the GENFy output and the HWx_TS_PUSH input within the "timesync_router" device-tree node. The Input Sources to the Time Sync Router are documented at: [1] The Output Destinations of the Time Sync Router are documented at: [2] The PPS signal can be verified using testptp and ppstest tools as follows: # ./testptp -d /dev/ptp0 -P 1 pps for system time request okay # ./ppstest /dev/pps0 trying PPS source "/dev/pps0" found PPS source "/dev/pps0" ok, found 1 source(s), now start fetching data... source 0 - assert 48.000000013, sequence: 8 - clear 0.000000000, sequence: 0 source 0 - assert 49.000000013, sequence: 9 - clear 0.000000000, sequence: 0 source 0 - assert 50.000000013, sequence: 10 - clear 0.000000000, sequence: 0 Add an example in the device-tree, enabling PPS generation on GENF1. The HW3_TS_PUSH Timestamp trigger input is used to verify the PPS signal. [1] Link: https://software-dl.ti.com/tisci/esd/latest/5_soc_doc/am62x/interrupt_cfg.html#timesync-event-router0-interrupt-router-input-sources [2] Link: https://software-dl.ti.com/tisci/esd/latest/5_soc_doc/am62x/interrupt_cfg.html#timesync-event-router0-interrupt-router-output-destinations Signed-off-by: Siddharth Vadapalli --- arch/arm64/boot/dts/ti/k3-am625-sk.dts | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/arch/arm64/boot/dts/ti/k3-am625-sk.dts b/arch/arm64/boot/dts/ti/k3-am625-sk.dts index 4f179b146cab..962a922cc94b 100644 --- a/arch/arm64/boot/dts/ti/k3-am625-sk.dts +++ b/arch/arm64/boot/dts/ti/k3-am625-sk.dts @@ -366,6 +366,10 @@ &cpsw3g { pinctrl-names = "default"; pinctrl-0 = <&main_rgmii1_pins_default &main_rgmii2_pins_default>; + + cpts@3d000 { + ti,pps = <2 1>; + }; }; &cpsw_port1 { @@ -464,3 +468,19 @@ partition@3fc0000 { }; }; }; + +#define TS_OFFSET(pa, val) (0x4+(pa)*4) (0x10000 | val) + +×ync_router { + status = "okay"; + pinctrl-names = "default"; + pinctrl-0 = <&cpsw_cpts>; + + /* Example of the timesync routing */ + cpsw_cpts: cpsw-cpts { + pinctrl-single,pins = < + /* pps [cpsw cpts genf1] in17 -> out12 [cpsw cpts hw3_push] */ + TS_OFFSET(12, 17) + >; + }; +};