From nobody Sun Sep 14 22:19:34 2025 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 D3FA8C32793 for ; Wed, 18 Jan 2023 17:30:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229895AbjARRaL (ORCPT ); Wed, 18 Jan 2023 12:30:11 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56714 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230212AbjARRaE (ORCPT ); Wed, 18 Jan 2023 12:30:04 -0500 Received: from mx07-00178001.pphosted.com (mx08-00178001.pphosted.com [91.207.212.93]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DB8EF4AA56 for ; Wed, 18 Jan 2023 09:30:01 -0800 (PST) Received: from pps.filterd (m0046660.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 30IHHSYM013300; Wed, 18 Jan 2023 18:29:51 +0100 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=foss.st.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=selector1; bh=ZyZacvmPX30CnzTNwDG1lwIQ0Nni4QdJteNf/VXJ/S8=; b=1xDLVJPrDMSNWFhGPGMhI01oyod1zhndHSgCXMtMcGDXpQZZekbqz6lUAfpeAQ3hXZwT jJFlI7MKTpjSi2QCb8OIvVr51F1uNvWPvMGxdKG78Cmcn5w/ibL+p/S1jFpfTY2r0rAm 9jeLwBg28ipR6ZGkfnYovzhpc1hkoPWVnzAInAx/agqvX5dPUr1f3Qx5QoQvTaaRxe4J 52qySX24f2MGAm4NQkxN4YTXWxUVlu55mmyG+KeX2mm+IV4jn96LtmuwTFNRyzgJMT/E DzY/B9ghg8+9knj3bi08Qp1REvI18E6UlCNKnB4dwm2kDXDwfwdTJwpv48o8eBRLhNbO qg== Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com (PPS) with ESMTPS id 3n5mc4uhmb-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 18 Jan 2023 18:29:51 +0100 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id DF0C410002A; Wed, 18 Jan 2023 18:29:50 +0100 (CET) Received: from Webmail-eu.st.com (shfdag1node3.st.com [10.75.129.71]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id DA2EE228A21; Wed, 18 Jan 2023 18:29:50 +0100 (CET) Received: from localhost (10.48.0.157) by SHFDAG1NODE3.st.com (10.75.129.71) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.13; Wed, 18 Jan 2023 18:29:50 +0100 From: Patrick Delaunay To: Alexandre TORGUE , Srinivas Kandagatla , Maxime Coquelin CC: Etienne CARRIERE , Fabrice GASNIER , Amelie DELAUNAY , Lionel DEBIEVE , Patrick Delaunay , , , Subject: [PATCH v6 3/3] nvmem: stm32: detect bsec pta presence for STM32MP15x Date: Wed, 18 Jan 2023 18:29:39 +0100 Message-ID: <20230118182856.v6.3.I59210046e368cfc22bd3cca2afe1653674f8ece8@changeid> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230118172940.841094-1-patrick.delaunay@foss.st.com> References: <20230118172940.841094-1-patrick.delaunay@foss.st.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [10.48.0.157] X-ClientProxiedBy: SHFCAS1NODE1.st.com (10.75.129.72) To SHFDAG1NODE3.st.com (10.75.129.71) X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.923,Hydra:6.0.562,FMLib:17.11.122.1 definitions=2023-01-18_05,2023-01-18_01,2022-06-22_01 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" On STM32MP15x SoC, the SMC backend is optional when OP-TEE is used; the PTA BSEC should be used as it is done on STM32MP13x platform, but the BSEC SMC can be also used: it is a legacy mode in OP-TEE, not recommended but used in previous OP-TEE firmware. The presence of OP-TEE is dynamically detected in STM32MP15x device tree and the supported NVMEM backend is dynamically detected: - PTA with stm32_bsec_pta_find - SMC with stm32_bsec_check With OP-TEE but without PTA and SMC detection, the probe is deferred for STM32MP15x devices. On STM32MP13x platform, only the PTA is supported with cfg->ta =3D true and this detection is skipped. Signed-off-by: Patrick Delaunay Reviewed-by: Etienne Carriere --- Changes in v6: - added reviewed by Etienne Carriere Changes in v5: - update the BSEC SMC detection logic in stm32_romem_probe() after Etienne Carierre review to support NVMEM probe after OP-TEE probe Changes in v3: - use of_find_compatible_node in optee_presence_check function instead of of_find_node_by_path("/firmware/optee") Changes in v2: - Added patch in the serie for BSEC PTA support on STM32MP15x with dynamic detection of OP-TEE presence and SMC support (legacy mode) drivers/nvmem/stm32-romem.c | 38 +++++++++++++++++++++++++++++++++---- 1 file changed, 34 insertions(+), 4 deletions(-) diff --git a/drivers/nvmem/stm32-romem.c b/drivers/nvmem/stm32-romem.c index 978a63edf297..ba779e26937a 100644 --- a/drivers/nvmem/stm32-romem.c +++ b/drivers/nvmem/stm32-romem.c @@ -159,6 +159,31 @@ static int stm32_bsec_pta_write(void *context, unsigne= d int offset, void *buf, return stm32_bsec_optee_ta_write(priv->ctx, priv->lower, offset, buf, byt= es); } =20 +static bool stm32_bsec_smc_check(void) +{ + u32 val; + int ret; + + /* check that the OP-TEE support the BSEC SMC (legacy mode) */ + ret =3D stm32_bsec_smc(STM32_SMC_READ_SHADOW, 0, 0, &val); + + return !ret; +} + +static bool optee_presence_check(void) +{ + struct device_node *np; + bool tee_detected =3D false; + + /* check that the OP-TEE node is present and available. */ + np =3D of_find_compatible_node(NULL, NULL, "linaro,optee-tz"); + if (np && of_device_is_available(np)) + tee_detected =3D true; + of_node_put(np); + + return tee_detected; +} + static int stm32_romem_probe(struct platform_device *pdev) { const struct stm32_romem_cfg *cfg; @@ -195,11 +220,16 @@ static int stm32_romem_probe(struct platform_device *= pdev) } else { priv->cfg.size =3D cfg->size; priv->lower =3D cfg->lower; - if (cfg->ta) { + if (cfg->ta || optee_presence_check()) { rc =3D stm32_bsec_optee_ta_open(&priv->ctx); - /* wait for OP-TEE client driver to be up and ready */ - if (rc) - return rc; + if (rc) { + /* wait for OP-TEE client driver to be up and ready */ + if (rc =3D=3D -EPROBE_DEFER) + return -EPROBE_DEFER; + /* BSEC PTA is required or SMC not supported */ + if (cfg->ta || !stm32_bsec_smc_check()) + return rc; + } } if (priv->ctx) { rc =3D devm_add_action_or_reset(dev, stm32_bsec_optee_ta_close, priv->c= tx); --=20 2.25.1