From mboxrd@z Thu Jan 1 00:00:00 1970 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B8BD3CD98E2 for ; Mon, 15 Jun 2026 12:31:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=VPmpKQP5INxuKqSCk2KpcTRPXdjTeeSY27wYeWvsmvE=; b=TIkRwsCD+Pd/ZEMGaWZIzSAsX+ XZX5aPaxy0ymAtC0b3WnpPBOyRlFLyIRCC1+GVPE0xVtBVXnEOEzy4SMOc/gKv4yT5XceuWePVRFF qd6xns3bVc0alU1jk/kyItMNsJ5ZLb2GaO3fAnnFX7TBe2foAuqyVnJhoxgvT5edXLKEROZNLO26C BGqSRLVcNTaifxkARUTOikCLn2ssJEiN/JF1ApBdCtiJV4BaMjeLxZSNaNnvgYrkrr/m2lK5f30A/ 7XeuhNAPhKBYPhx+KeGyYsL/NjcGWAxearh+L4BnVf2IBb4oHZtlPE1cotJH3TsmgVuH/CSp5sImS wtm0bAYw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wZ6Ss-0000000EBat-2seM; Mon, 15 Jun 2026 12:30:54 +0000 Received: from mail-wm1-x331.google.com ([2a00:1450:4864:20::331]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wZ6Sg-0000000EBMe-2cDK for linux-arm-kernel@lists.infradead.org; Mon, 15 Jun 2026 12:30:45 +0000 Received: by mail-wm1-x331.google.com with SMTP id 5b1f17b1804b1-490b3e03939so24429265e9.1 for ; Mon, 15 Jun 2026 05:30:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1781526641; x=1782131441; darn=lists.infradead.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=VPmpKQP5INxuKqSCk2KpcTRPXdjTeeSY27wYeWvsmvE=; b=L5/pj9yK9mzthQK4otZfMSzu7A3a6j8bt+1MnI+LNtVvaEzbIZ6zGXadRz6N4UaapQ e/bCg5OeXANwLRyC/E3ofTPatKClBizJ6zfzlkMR0b5sawJBgVIWQ/vaBDF7FOxOlplB 5LPVRSR1uJ1kKV7z+OiF8ezeFXq/0tLI8J2VnwNvQDgnG1slUbAaTpn5OGshAHdTlgCE 5dpA7T0q14IJ3WkXomyYa894KMQDbR5hg2U7y1SJWGXF+RZ770Qi6C6xCHWJ0UyeyR22 SVKc2O4Uxq/hwdC9tiO5fUcdDWgd+Oln+kuJEfdgRybkDTjII4QVg/nB1MbimOSb8U2O FFog== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1781526641; x=1782131441; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=VPmpKQP5INxuKqSCk2KpcTRPXdjTeeSY27wYeWvsmvE=; b=RiIQ74x63XH5uKRH+/Mo9weGzF4eKJES0D+aPyITKEI9LxoxGTxXe9dp/w8cLPlYyD daPCSFC8E+Ljh+IfifV4PRRhbIJ9vaxDzg+Rz4u/En2T5VVCbqjIFKOIs6aSj/Eq5B1G 4++UMmskp+0JsljU9sB02AlBvfKnohxGs2PLOIy0LnuCLI2G1cbitAxWMFEdC8wCXzpR 0xF/B9fjudHBt4GPd3Jpy6Rmhl5Q4NFbAT2zjdgHAMCZ3LXdzGgbkF/ATllMkLnbaO/J QHXvTl3nfrO2mL+k1oZesCe8pGMq/aAefmljPnHO0ecNlXgzXhayC5uiL8aSjxKmpnp7 IB1g== X-Forwarded-Encrypted: i=1; AFNElJ/5sGOtfGweFkQPJqex/jCuMXzKi/I/5sB+hq82tLFs0tqr7wKCFXEXCfWND9Yk5BbaQEyKXEDcdTbtw4lW6tYk@lists.infradead.org X-Gm-Message-State: AOJu0YyZldlt1NXU+Px1XtRRurQuroDNMzcbPMUtIg9/PDGMnRZvjHTr a2F3trYGZqQ0J14xlMz9aUFvBuXLq9VPHcMyBBTXyJ+ymiCg8tYWlc9P X-Gm-Gg: Acq92OEfS0rWsnxHNhIQCBW/UNjAiFvpLtHUZ05lX4tWgZdX/BJdsU0+DtHzSdp9dM0 lOfvP5kkKIPJKWwJktFrBu5T4vRmtacgg4Mp3o5Zmc7FczIS0k0snQnw9RP1Y/e7Ud8SXkai1GD o88fCdv7jAlD4n5hbJnLACQyC91NqAzSnjhiM2MtaJR65g9LgljXfzNByMEOxjgWKo+mkxF8hbC 2qkXivJGJrot/73vI47mj4qjcSAG4Pwz72Y8wcyVwm5Mb6ZEpVAreKtQ5zVKYArURA/SQcRE8rL fJC+2DYxlZKxEA5Qo9f1B2YQd0sMcCL0D/g4r0py0X3ZOqZJgIHjgaE3Pc7kJE6r+F+ph9M+1KL 0Psm05lYPjxs4OJsk5o2hWVO8Sy/BUz6egIt0s8jONhu+NZMJS9bP68hFut2UOJOlkhCEkGelLN 0J3dRbvdYq4dttqs57kRkR7VBoHOIF2k9WNZNF4Xi9T86HiwuqUm3PNsX5+TG+ClkadA== X-Received: by 2002:a05:600c:c171:b0:48a:53cb:8604 with SMTP id 5b1f17b1804b1-490ec4dfb03mr140851455e9.14.1781526640428; Mon, 15 Jun 2026 05:30:40 -0700 (PDT) Received: from Ansuel-XPS24 (93-34-88-103.ip49.fastwebnet.it. [93.34.88.103]) by smtp.googlemail.com with ESMTPSA id 5b1f17b1804b1-490ea95c512sm191426435e9.2.2026.06.15.05.30.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 15 Jun 2026 05:30:39 -0700 (PDT) From: Christian Marangi To: Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Simon Horman , Jonathan Corbet , Shuah Khan , Christian Marangi , Lorenzo Bianconi , Heiner Kallweit , Russell King , Saravana Kannan , Philipp Zabel , Nathan Chancellor , Nick Desaulniers , Bill Wendling , Justin Stitt , netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, llvm@lists.linux.dev Cc: Daniel Golle Subject: [PATCH net-next v7 04/12] net: pcs: implement Firmware node support for PCS driver Date: Mon, 15 Jun 2026 14:29:40 +0200 Message-ID: <20260615122950.22281-5-ansuelsmth@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260615122950.22281-1-ansuelsmth@gmail.com> References: <20260615122950.22281-1-ansuelsmth@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260615_053044_374172_D3172DD8 X-CRM114-Status: GOOD ( 36.75 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Implement the foundation of Firmware node support for PCS driver. To support this, implement a simple Provider API where a PCS driver can expose multiple PCS with an xlate .get function. PCS driver will have to call fwnode_pcs_add_provider() and pass the firmware node pointer and a xlate function to return the correct PCS for the passed #pcs-cells. This will register the PCS in a global list of providers so that consumer can access it. The consumer will then use fwnode_pcs_get() to get the actual PCS by passing the firmware node pointer and the index for #pcs-cells. For a simple implementation where #pcs-cells is 0 and the PCS driver expose a single PCS, the xlate function fwnode_pcs_simple_get() is provided. For an advanced implementation a custom xlate function is required. On removal the PCS driver should first delete itself from the provider list using fwnode_pcs_del_provider() and then call phylink_release_pcs() on every PCS the driver provides. Generic functions fwnode_phylink_pcs_count() and fwnode_phylink_pcs_parse() are provided for MAC driver that will declare PCS in DT (or ACPI). Function fwnode_phylink_pcs_count() will parse "pcs-handle" property and will return the number of PCS entries described in the passed firmware node. Function fwnode_phylink_pcs_parse() will parse "pcs-handle" property and fill the passed available_pcs array with the available PCS found up to passed num_pcs value. It's worth to mention that this function will ignore PCS that still needs to be probed (returning -ENODEV) and such PCS won't be added to the available_pcs array. Co-developed-by: Daniel Golle Signed-off-by: Daniel Golle Signed-off-by: Christian Marangi --- drivers/net/pcs/Kconfig | 6 + drivers/net/pcs/Makefile | 1 + drivers/net/pcs/pcs.c | 208 +++++++++++++++++++++++++++++++ include/linux/pcs/pcs-provider.h | 41 ++++++ include/linux/pcs/pcs.h | 75 +++++++++++ 5 files changed, 331 insertions(+) create mode 100644 drivers/net/pcs/pcs.c create mode 100644 include/linux/pcs/pcs-provider.h create mode 100644 include/linux/pcs/pcs.h diff --git a/drivers/net/pcs/Kconfig b/drivers/net/pcs/Kconfig index e417fd66f660..2ce89d4bff6b 100644 --- a/drivers/net/pcs/Kconfig +++ b/drivers/net/pcs/Kconfig @@ -5,6 +5,12 @@ menu "PCS device drivers" +config FWNODE_PCS + bool "PCS Firmware Node" + depends on (ACPI || OF) + help + Firmware node PCS accessors + config PCS_XPCS tristate "Synopsys DesignWare Ethernet XPCS" select PHYLINK diff --git a/drivers/net/pcs/Makefile b/drivers/net/pcs/Makefile index 4f7920618b90..3005cdd89ab7 100644 --- a/drivers/net/pcs/Makefile +++ b/drivers/net/pcs/Makefile @@ -1,6 +1,7 @@ # SPDX-License-Identifier: GPL-2.0 # Makefile for Linux PCS drivers +obj-$(CONFIG_FWNODE_PCS) += pcs.o pcs_xpcs-$(CONFIG_PCS_XPCS) := pcs-xpcs.o pcs-xpcs-plat.o \ pcs-xpcs-nxp.o pcs-xpcs-wx.o diff --git a/drivers/net/pcs/pcs.c b/drivers/net/pcs/pcs.c new file mode 100644 index 000000000000..67f9716f48fd --- /dev/null +++ b/drivers/net/pcs/pcs.c @@ -0,0 +1,208 @@ +// SPDX-License-Identifier: GPL-2.0-or-later + +#include +#include +#include +#include +#include + +MODULE_DESCRIPTION("PCS library"); +MODULE_AUTHOR("Christian Marangi "); +MODULE_LICENSE("GPL"); + +struct fwnode_pcs_provider { + struct list_head link; + + struct fwnode_handle *fwnode; + struct phylink_pcs *(*get)(struct fwnode_reference_args *pcsspec, + void *data); + + void *data; +}; + +static LIST_HEAD(fwnode_pcs_providers); +static DEFINE_MUTEX(fwnode_pcs_mutex); + +struct phylink_pcs *fwnode_pcs_simple_get(struct fwnode_reference_args *pcsspec, + void *data) +{ + return data; +} +EXPORT_SYMBOL_GPL(fwnode_pcs_simple_get); + +int fwnode_pcs_add_provider(struct fwnode_handle *fwnode, + struct phylink_pcs *(*get)(struct fwnode_reference_args *pcsspec, + void *data), + void *data) +{ + struct fwnode_pcs_provider *pp; + + if (!fwnode) + return 0; + + pp = kzalloc_obj(*pp); + if (!pp) + return -ENOMEM; + + pp->fwnode = fwnode_handle_get(fwnode); + pp->data = data; + pp->get = get; + + mutex_lock(&fwnode_pcs_mutex); + list_add(&pp->link, &fwnode_pcs_providers); + mutex_unlock(&fwnode_pcs_mutex); + pr_debug("Added pcs provider from %pfwf\n", fwnode); + + fwnode_dev_initialized(fwnode, true); + + return 0; +} +EXPORT_SYMBOL_GPL(fwnode_pcs_add_provider); + +void fwnode_pcs_del_provider(struct fwnode_handle *fwnode) +{ + struct fwnode_pcs_provider *pp; + + if (!fwnode) + return; + + mutex_lock(&fwnode_pcs_mutex); + list_for_each_entry(pp, &fwnode_pcs_providers, link) { + if (pp->fwnode == fwnode) { + list_del(&pp->link); + fwnode_dev_initialized(pp->fwnode, false); + fwnode_handle_put(pp->fwnode); + kfree(pp); + break; + } + } + mutex_unlock(&fwnode_pcs_mutex); +} +EXPORT_SYMBOL_GPL(fwnode_pcs_del_provider); + +static int fwnode_parse_pcsspec(const struct fwnode_handle *fwnode, + unsigned int index, const char *name, + struct fwnode_reference_args *out_args) +{ + int ret; + + if (!fwnode) + return -EINVAL; + + if (name) { + index = fwnode_property_match_string(fwnode, "pcs-names", + name); + if (index < 0) + return index; + } + + ret = fwnode_property_get_reference_args(fwnode, "pcs-handle", + "#pcs-cells", + -1, index, out_args); + if (ret || (name && index < 0)) + return ret; + + return 0; +} + +static struct phylink_pcs * +fwnode_pcs_get_from_pcsspec(struct fwnode_reference_args *pcsspec) +{ + struct fwnode_pcs_provider *provider; + struct phylink_pcs *pcs = ERR_PTR(-ENODEV); + + if (!pcsspec) + return ERR_PTR(-EINVAL); + + mutex_lock(&fwnode_pcs_mutex); + list_for_each_entry(provider, &fwnode_pcs_providers, link) { + if (provider->fwnode == pcsspec->fwnode) { + pcs = provider->get(pcsspec, provider->data); + if (!IS_ERR(pcs)) + break; + } + } + mutex_unlock(&fwnode_pcs_mutex); + + return pcs; +} + +static struct phylink_pcs *__fwnode_pcs_get(struct fwnode_handle *fwnode, + unsigned int index, const char *con_id) +{ + struct fwnode_reference_args pcsspec; + struct phylink_pcs *pcs; + int ret; + + ret = fwnode_parse_pcsspec(fwnode, index, con_id, &pcsspec); + if (ret) + return ERR_PTR(ret); + + pcs = fwnode_pcs_get_from_pcsspec(&pcsspec); + fwnode_handle_put(pcsspec.fwnode); + + return pcs; +} + +struct phylink_pcs *fwnode_pcs_get(struct fwnode_handle *fwnode, unsigned int index) +{ + return __fwnode_pcs_get(fwnode, index, NULL); +} +EXPORT_SYMBOL_GPL(fwnode_pcs_get); + +unsigned int fwnode_phylink_pcs_count(struct fwnode_handle *fwnode) +{ + struct fwnode_reference_args out_args; + int index = 0; + int ret; + + while (true) { + ret = fwnode_property_get_reference_args(fwnode, "pcs-handle", + "#pcs-cells", + -1, index, &out_args); + /* We expect to reach an -ENOENT error while counting */ + if (ret) + break; + + fwnode_handle_put(out_args.fwnode); + index++; + } + + return index; +} +EXPORT_SYMBOL_GPL(fwnode_phylink_pcs_count); + +int fwnode_phylink_pcs_parse(struct fwnode_handle *fwnode, + struct phylink_pcs **available_pcs, + unsigned int num_pcs) +{ + unsigned int i, found = 0; + + if (!available_pcs) + return -EINVAL; + + if (!fwnode_property_present(fwnode, "pcs-handle")) + return -ENODEV; + + for (i = 0; i < num_pcs; i++) { + struct phylink_pcs *pcs; + + pcs = fwnode_pcs_get(fwnode, i); + if (IS_ERR(pcs)) { + /* + * Ignore -ENODEV error for PCS that still + * needs to probe. + */ + if (PTR_ERR(pcs) == -ENODEV) + continue; + + return PTR_ERR(pcs); + } + + available_pcs[found] = pcs; + found++; + } + + return found; +} +EXPORT_SYMBOL_GPL(fwnode_phylink_pcs_parse); diff --git a/include/linux/pcs/pcs-provider.h b/include/linux/pcs/pcs-provider.h new file mode 100644 index 000000000000..ae51c108147e --- /dev/null +++ b/include/linux/pcs/pcs-provider.h @@ -0,0 +1,41 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +#ifndef __LINUX_PCS_PROVIDER_H +#define __LINUX_PCS_PROVIDER_H + +/** + * fwnode_pcs_simple_get - Simple xlate function to retrieve PCS + * @pcsspec: reference arguments + * @data: Context data (assumed assigned to the single PCS) + * + * Returns: the PCS pointed by data. + */ +struct phylink_pcs *fwnode_pcs_simple_get(struct fwnode_reference_args *pcsspec, + void *data); + +/** + * fwnode_pcs_add_provider - Registers a new PCS provider + * @fwnode: Firmware node + * @get: xlate function to retrieve the PCS + * @data: Context data + * + * Register and add a new PCS to the global providers list + * for the firmware node. A function to get the PCS from + * firmware node with the use fwnode reference arguments. + * To the get function is also passed the interface type + * requested for the PHY. PCS driver will use the passed + * interface to understand if the PCS can support it or not. + * + * Returns: 0 on success or -ENOMEM on allocation failure. + */ +int fwnode_pcs_add_provider(struct fwnode_handle *fwnode, + struct phylink_pcs *(*get)(struct fwnode_reference_args *pcsspec, + void *data), + void *data); + +/** + * fwnode_pcs_del_provider - Removes a PCS provider + * @fwnode: Firmware node + */ +void fwnode_pcs_del_provider(struct fwnode_handle *fwnode); + +#endif /* __LINUX_PCS_PROVIDER_H */ diff --git a/include/linux/pcs/pcs.h b/include/linux/pcs/pcs.h new file mode 100644 index 000000000000..df1e6f32cfad --- /dev/null +++ b/include/linux/pcs/pcs.h @@ -0,0 +1,75 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +#ifndef __LINUX_PCS_H +#define __LINUX_PCS_H + +#include + +#if IS_ENABLED(CONFIG_FWNODE_PCS) +/** + * fwnode_pcs_get - Retrieves a PCS from a firmware node + * @fwnode: firmware node + * @index: index fwnode PCS handle in firmware node + * + * Get a PCS from the firmware node at index. + * + * Returns: a pointer to the phylink_pcs or a negative + * error pointer. Can return -ENODEV if the PCS is not + * present in global providers list (either due to driver + * still needs to be probed or it failed to probe/removed). + */ +struct phylink_pcs *fwnode_pcs_get(struct fwnode_handle *fwnode, + unsigned int index); + +/** + * fwnode_phylink_pcs_count - count PCS entries described in firmware node + * @fwnode: firmware node + * + * Helper function to count the number of PCS entries referenced by the + * "pcs-handle" property in a firmware node. + * + * Note that this function counts all PCS references in the firmware node, + * regardless of whether the corresponding PCS devices are already probed. + * + * Returns: number of PCS entries described in the firmware node. + */ +unsigned int fwnode_phylink_pcs_count(struct fwnode_handle *fwnode); + +/** + * fwnode_phylink_pcs_parse - parse available PCS from firmware node + * @fwnode: firmware node + * @available_pcs: pointer to preallocated array of PCS + * @num_pcs: maximum number of PCS entries to scan + * + * Helper function that parses PCS references from the "pcs-handle" + * property of a firmware node and fills @available_pcs with PCS that are + * currently available up to @num_pcs. + * + * Only PCS that are currently available are stored in @available_pcs. + * PCS that returns -ENODEV are skipped. + * + * Returns: number of PCS stored in @available_pcs, or negative error code. + */ +int fwnode_phylink_pcs_parse(struct fwnode_handle *fwnode, + struct phylink_pcs **available_pcs, + unsigned int num_pcs); +#else +static inline struct phylink_pcs *fwnode_pcs_get(struct fwnode_handle *fwnode, + int index) +{ + return ERR_PTR(-ENOENT); +} + +static inline unsigned int fwnode_phylink_pcs_count(struct fwnode_handle *fwnode) +{ + return 0; +} + +static inline int fwnode_phylink_pcs_parse(struct fwnode_handle *fwnode, + struct phylink_pcs **available_pcs, + unsigned int num_pcs) +{ + return -EOPNOTSUPP; +} +#endif + +#endif /* __LINUX_PCS_H */ -- 2.53.0