From patchwork Thu Mar 4 15:02:11 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andy Shevchenko X-Patchwork-Id: 1447399 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-gpio-owner@vger.kernel.org; receiver=) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4DrvLX6sXsz9sWW for ; Fri, 5 Mar 2021 02:05:24 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233200AbhCDPEw (ORCPT ); Thu, 4 Mar 2021 10:04:52 -0500 Received: from mga05.intel.com ([192.55.52.43]:45937 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233141AbhCDPET (ORCPT ); Thu, 4 Mar 2021 10:04:19 -0500 IronPort-SDR: rO/34UFRJeFSZwvOXCfTbTIHxqQ968WuvbVUJ6rvRa53uqQZFqt9UPeD3jrKXfxfeu1C9DQxuJ Q5fxgnmFwASg== X-IronPort-AV: E=McAfee;i="6000,8403,9913"; a="272434319" X-IronPort-AV: E=Sophos;i="5.81,222,1610438400"; d="scan'208";a="272434319" Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Mar 2021 07:02:33 -0800 IronPort-SDR: ejtO0G/+NyBvXAUeE8vde46ZcFOhKk+mp0N4WyWzegdTbAMObUkQ4aAwsxj26DFzjxfrrYto3P 1ZI99toT5DQw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.81,222,1610438400"; d="scan'208";a="445758478" Received: from black.fi.intel.com ([10.237.72.28]) by orsmga001.jf.intel.com with ESMTP; 04 Mar 2021 07:02:30 -0800 Received: by black.fi.intel.com (Postfix, from userid 1003) id 8370E29E; Thu, 4 Mar 2021 17:02:30 +0200 (EET) From: Andy Shevchenko To: Andy Shevchenko , Linus Walleij , Mika Westerberg , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, linux-acpi@vger.kernel.org Cc: Marc Zyngier , Jonathan Corbet , Bartosz Golaszewski , Thomas Gleixner , "Rafael J. Wysocki" Subject: [PATCH v2 1/5] irqdomain: Introduce irq_domain_create_simple() API Date: Thu, 4 Mar 2021 17:02:11 +0200 Message-Id: <20210304150215.80652-2-andriy.shevchenko@linux.intel.com> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210304150215.80652-1-andriy.shevchenko@linux.intel.com> References: <20210304150215.80652-1-andriy.shevchenko@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org Linus Walleij pointed out that ird_domain_add_simple() gained additional functionality and can't be anymore replaced with a simple conditional. In preparation to upgrade GPIO library to use fwnode, introduce irq_domain_create_simple() API which is functional equivalent to the existing irq_domain_add_simple(), but takes a pointer to the struct fwnode_handle as a parameter. While at it, amend documentation to mention irq_domain_create_*() functions where it makes sense. Signed-off-by: Andy Shevchenko --- Documentation/core-api/irq/irq-domain.rst | 22 ++++++++++++---------- include/linux/irqdomain.h | 5 +++++ kernel/irq/irqdomain.c | 16 +++++++++++++--- 3 files changed, 30 insertions(+), 13 deletions(-) diff --git a/Documentation/core-api/irq/irq-domain.rst b/Documentation/core-api/irq/irq-domain.rst index a77c24c27f7b..8214e215a8bf 100644 --- a/Documentation/core-api/irq/irq-domain.rst +++ b/Documentation/core-api/irq/irq-domain.rst @@ -42,10 +42,10 @@ irq_domain usage ================ An interrupt controller driver creates and registers an irq_domain by -calling one of the irq_domain_add_*() functions (each mapping method -has a different allocator function, more on that later). The function -will return a pointer to the irq_domain on success. The caller must -provide the allocator function with an irq_domain_ops structure. +calling one of the irq_domain_add_*() or irq_domain_create_*() functions +(each mapping method has a different allocator function, more on that later). +The function will return a pointer to the irq_domain on success. The caller +must provide the allocator function with an irq_domain_ops structure. In most cases, the irq_domain will begin empty without any mappings between hwirq and IRQ numbers. Mappings are added to the irq_domain @@ -147,6 +147,7 @@ Legacy irq_domain_add_simple() irq_domain_add_legacy() irq_domain_add_legacy_isa() + irq_domain_create_simple() irq_domain_create_legacy() The Legacy mapping is a special case for drivers that already have a @@ -169,13 +170,13 @@ supported. For example, ISA controllers would use the legacy map for mapping Linux IRQs 0-15 so that existing ISA drivers get the correct IRQ numbers. -Most users of legacy mappings should use irq_domain_add_simple() which -will use a legacy domain only if an IRQ range is supplied by the -system and will otherwise use a linear domain mapping. The semantics -of this call are such that if an IRQ range is specified then +Most users of legacy mappings should use irq_domain_add_simple() or +irq_domain_create_simple() which will use a legacy domain only if an IRQ range +is supplied by the system and will otherwise use a linear domain mapping. +The semantics of this call are such that if an IRQ range is specified then descriptors will be allocated on-the-fly for it, and if no range is -specified it will fall through to irq_domain_add_linear() which means -*no* irq descriptors will be allocated. +specified it will fall through to irq_domain_add_linear() or +irq_domain_create_linear() which means *no* irq descriptors will be allocated. A typical use case for simple domains is where an irqchip provider is supporting both dynamic and static IRQ assignments. @@ -186,6 +187,7 @@ that the driver using the simple domain call irq_create_mapping() before any irq_find_mapping() since the latter will actually work for the static IRQ assignment case. +irq_domain_add_simple() and irq_domain_create_simple() as well as irq_domain_add_legacy() and irq_domain_create_legacy() are functionally equivalent, except for the first argument is different - the former accepts an Open Firmware specific 'struct device_node', while the latter diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h index 42d196805f58..1d4a8e7c5d5f 100644 --- a/include/linux/irqdomain.h +++ b/include/linux/irqdomain.h @@ -265,6 +265,11 @@ struct irq_domain *irq_domain_add_simple(struct device_node *of_node, unsigned int first_irq, const struct irq_domain_ops *ops, void *host_data); +struct irq_domain *irq_domain_create_simple(struct fwnode_handle *fwnode, + unsigned int size, + unsigned int first_irq, + const struct irq_domain_ops *ops, + void *host_data); struct irq_domain *irq_domain_add_legacy(struct device_node *of_node, unsigned int size, unsigned int first_irq, diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c index 288151393a06..418548ea13cf 100644 --- a/kernel/irq/irqdomain.c +++ b/kernel/irq/irqdomain.c @@ -317,10 +317,20 @@ struct irq_domain *irq_domain_add_simple(struct device_node *of_node, unsigned int first_irq, const struct irq_domain_ops *ops, void *host_data) +{ + return irq_domain_create_simple(of_node_to_fwnode(of_node), size, first_irq, ops, host_data); +} +EXPORT_SYMBOL_GPL(irq_domain_add_simple); + +struct irq_domain *irq_domain_create_simple(struct fwnode_handle *fwnode, + unsigned int size, + unsigned int first_irq, + const struct irq_domain_ops *ops, + void *host_data) { struct irq_domain *domain; - domain = __irq_domain_add(of_node_to_fwnode(of_node), size, size, 0, ops, host_data); + domain = __irq_domain_add(fwnode, size, size, 0, ops, host_data); if (!domain) return NULL; @@ -328,7 +338,7 @@ struct irq_domain *irq_domain_add_simple(struct device_node *of_node, if (IS_ENABLED(CONFIG_SPARSE_IRQ)) { /* attempt to allocated irq_descs */ int rc = irq_alloc_descs(first_irq, first_irq, size, - of_node_to_nid(of_node)); + of_node_to_nid(to_of_node(fwnode))); if (rc < 0) pr_info("Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n", first_irq); @@ -338,7 +348,7 @@ struct irq_domain *irq_domain_add_simple(struct device_node *of_node, return domain; } -EXPORT_SYMBOL_GPL(irq_domain_add_simple); +EXPORT_SYMBOL_GPL(irq_domain_create_simple); /** * irq_domain_add_legacy() - Allocate and register a legacy revmap irq_domain.