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 X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id ABEFEC433E1 for ; Fri, 29 May 2020 13:31:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 91CB921527 for ; Fri, 29 May 2020 13:31:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727063AbgE2NbA (ORCPT ); Fri, 29 May 2020 09:31:00 -0400 Received: from mga06.intel.com ([134.134.136.31]:34291 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726936AbgE2Na7 (ORCPT ); Fri, 29 May 2020 09:30:59 -0400 IronPort-SDR: G+T4Ikq2qOSu6o/loLHCEOn9gbt9H6lZ5IFvqhWIeYQoF79kgGiheHdlqmQcmFcZ8jrSbyoCbb cVEOY+3yBdfw== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 May 2020 06:30:58 -0700 IronPort-SDR: 0D01yCu/SIf1gW2VMoKoiDmkVsaSyrNTg27kcgM1hS4UZx7RuASiD+9NQF+BxSaDsCpeJGQSGE QmOcV0ycjp8g== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.73,448,1583222400"; d="scan'208";a="469507476" Received: from black.fi.intel.com ([10.237.72.28]) by fmsmga005.fm.intel.com with ESMTP; 29 May 2020 06:30:55 -0700 Received: by black.fi.intel.com (Postfix, from userid 1003) id E8FEBFC; Fri, 29 May 2020 16:30:54 +0300 (EEST) From: Andy Shevchenko To: linux-gpio@vger.kernel.org, Linus Walleij , Bartosz Golaszewski Cc: Andy Shevchenko , Mika Westerberg Subject: [PATCH v4 2/2] gpio: pca953x: Override IRQ for one of the expanders on Galileo Gen 2 Date: Fri, 29 May 2020 16:30:54 +0300 Message-Id: <20200529133054.20136-2-andriy.shevchenko@linux.intel.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200529133054.20136-1-andriy.shevchenko@linux.intel.com> References: <20200529133054.20136-1-andriy.shevchenko@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-gpio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org ACPI table on Intel Galileo Gen 2 has wrong pin number for IRQ resource of one of the I²C GPIO expanders. Since we know what that number is and luckily have GPIO bases fixed for SoC's controllers, we may use a simple DMI quirk to match the platform and retrieve GpioInt() pin on it for the expander in question. Suggested-by: Mika Westerberg Signed-off-by: Andy Shevchenko --- v4: addressed some concerns, made code compact (Mika) drivers/gpio/gpio-pca953x.c | 79 +++++++++++++++++++++++++++++++++++++ 1 file changed, 79 insertions(+) diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c index 1fca8dd7824f..e2f637dbc61a 100644 --- a/drivers/gpio/gpio-pca953x.c +++ b/drivers/gpio/gpio-pca953x.c @@ -107,6 +107,79 @@ static const struct i2c_device_id pca953x_id[] = { }; MODULE_DEVICE_TABLE(i2c, pca953x_id); +#ifdef CONFIG_GPIO_PCA953X_IRQ + +#include +#include +#include + +static const struct dmi_system_id pca953x_dmi_acpi_irq_info[] = { + { + /* + * On Intel Galileo Gen 2 board the IRQ pin of one of + * the I²C GPIO expanders, which has GpioInt() resource, + * is provided as an absolute number instead of being + * relative. Since first controller (gpio-sch.c) and + * second (gpio-dwapb.c) are at the fixed bases, we may + * safely refer to the number in the global space to get + * an IRQ out of it. + */ + .matches = { + DMI_EXACT_MATCH(DMI_BOARD_NAME, "GalileoGen2"), + }, + }, + {} +}; + +#ifdef CONFIG_ACPI +static int pca953x_acpi_get_pin(struct acpi_resource *ares, void *data) +{ + struct acpi_resource_gpio *agpio; + int *pin = data; + + if (acpi_gpio_get_irq_resource(ares, &agpio)) + *pin = agpio->pin_table[0]; + return 1; +} + +static int pca953x_acpi_find_pin(struct device *dev) +{ + struct acpi_device *adev = ACPI_COMPANION(dev); + int pin = -ENOENT, ret; + LIST_HEAD(r); + + ret = acpi_dev_get_resources(adev, &r, pca953x_acpi_get_pin, &pin); + acpi_dev_free_resource_list(&r); + if (ret < 0) + return ret; + + return pin; +} +#else +static inline int pca953x_acpi_find_pin(struct device *dev) { return -ENXIO; } +#endif + +static int pca953x_acpi_get_irq(struct device *dev) +{ + int pin, ret; + + pin = pca953x_acpi_find_pin(dev); + if (pin < 0) + return pin; + + dev_info(dev, "Applying ACPI interrupt quirk (GPIO %d)\n", pin); + + if (!gpio_is_valid(pin)) + return -EINVAL; + + ret = gpio_request(pin, "pca953x interrupt"); + if (ret) + return ret; + + return gpio_to_irq(pin); +} +#endif + static const struct acpi_device_id pca953x_acpi_ids[] = { { "INT3491", 16 | PCA953X_TYPE | PCA_LATCH_INT, }, { } @@ -752,6 +825,12 @@ static int pca953x_irq_setup(struct pca953x_chip *chip, int irq_base) DECLARE_BITMAP(irq_stat, MAX_LINE); int ret; + if (dmi_first_match(pca953x_dmi_acpi_irq_info)) { + ret = pca953x_acpi_get_irq(&client->dev); + if (ret > 0) + client->irq = ret; + } + if (!client->irq) return 0; -- 2.26.2