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dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=axiado.com; Received-SPF: Fail (protection.outlook.com: domain of axiado.com does not designate 4.227.125.105 as permitted sender) receiver=protection.outlook.com; client-ip=4.227.125.105; helo=[127.0.0.1]; Received: from [127.0.0.1] (4.227.125.105) by DS3PEPF0000C380.mail.protection.outlook.com (10.167.23.10) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.20.9520.1 via Frontend Transport; Fri, 9 Jan 2026 09:26:28 +0000 From: Swark Yang Date: Fri, 09 Jan 2026 01:26:06 -0800 Subject: [PATCH v2 1/2] gpio: cadence: Add quirk for Axiado AX3000 platform Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260109-axiado-ax3000-cadence-gpio-support-v2-1-fc1e28edf68a@axiado.com> References: <20260109-axiado-ax3000-cadence-gpio-support-v2-0-fc1e28edf68a@axiado.com> In-Reply-To: <20260109-axiado-ax3000-cadence-gpio-support-v2-0-fc1e28edf68a@axiado.com> To: Linus Walleij , Bartosz Golaszewski Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, openbmc@lists.ozlabs.org, Swark Yang , Tzu-Hao Wei X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; 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X-OriginatorOrg: axiado.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Jan 2026 09:26:28.0829 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e755f167-f783-491f-8be4-08de4f612b11 X-MS-Exchange-CrossTenant-Id: ff2db17c-4338-408e-9036-2dee8e3e17d7 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=ff2db17c-4338-408e-9036-2dee8e3e17d7;Ip=[4.227.125.105];Helo=[[127.0.0.1]] X-MS-Exchange-CrossTenant-AuthSource: DS3PEPF0000C380.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR18MB5305 On the Axiado AX3000 platform, pinmux and pin configuration (such as direction and output enable) are configured by the hardware/firmware at boot time before Linux boots. To prevent conflicts, introduce a platform-specific quirk triggered by the "axiado,ax3000-gpio" compatible string. When this quirk is active, the driver will skip its default initialization of pinmux configuration and direction settings during probe. Co-developed-by: Tzu-Hao Wei Signed-off-by: Tzu-Hao Wei Signed-off-by: Swark Yang Reviewed-by: Linus Walleij --- drivers/gpio/gpio-cadence.c | 56 ++++++++++++++++++++++++++++++++++++-----= ---- 1 file changed, 45 insertions(+), 11 deletions(-) diff --git a/drivers/gpio/gpio-cadence.c b/drivers/gpio/gpio-cadence.c index b75734ca22dd..85aef54d0aec 100644 --- a/drivers/gpio/gpio-cadence.c +++ b/drivers/gpio/gpio-cadence.c @@ -2,6 +2,7 @@ =20 /* * Copyright 2017-2018 Cadence + * Copyright (C) 2025 Axiado Corporation. * * Authors: * Jan Kotas @@ -31,10 +32,23 @@ #define CDNS_GPIO_IRQ_VALUE 0x28 #define CDNS_GPIO_IRQ_ANY_EDGE 0x2c =20 +struct cdns_gpio_quirks { + bool skip_init; +}; + struct cdns_gpio_chip { struct gpio_generic_chip gen_gc; void __iomem *regs; u32 bypass_orig; + const struct cdns_gpio_quirks *quirks; +}; + +static const struct cdns_gpio_quirks cdns_default_quirks =3D { + .skip_init =3D false, +}; + +static const struct cdns_gpio_quirks ax3000_gpio_quirks =3D { + .skip_init =3D true, }; =20 static int cdns_gpio_request(struct gpio_chip *chip, unsigned int offset) @@ -141,6 +155,19 @@ static const struct irq_chip cdns_gpio_irqchip =3D { GPIOCHIP_IRQ_RESOURCE_HELPERS, }; =20 +static const struct of_device_id cdns_of_ids[] =3D { + { + .compatible =3D "axiado,ax3000-gpio", + .data =3D &ax3000_gpio_quirks + }, + { + .compatible =3D "cdns,gpio-r1p02", + .data =3D &cdns_default_quirks + }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, cdns_of_ids); + static int cdns_gpio_probe(struct platform_device *pdev) { struct gpio_generic_chip_config config =3D { }; @@ -165,6 +192,10 @@ static int cdns_gpio_probe(struct platform_device *pde= v) return -EINVAL; } =20 + cgpio->quirks =3D device_get_match_data(&pdev->dev); + if (!cgpio->quirks) + cgpio->quirks =3D &cdns_default_quirks; + /* * Set all pins as inputs by default, otherwise: * gpiochip_lock_as_irq: @@ -173,8 +204,15 @@ static int cdns_gpio_probe(struct platform_device *pde= v) * so it needs to be changed before gpio_generic_chip_init() is called. */ dir_prev =3D ioread32(cgpio->regs + CDNS_GPIO_DIRECTION_MODE); - iowrite32(GENMASK(num_gpios - 1, 0), - cgpio->regs + CDNS_GPIO_DIRECTION_MODE); + + /* + * The AX3000 platform performs the required configuration at boot time + * before Linux boots, so this quirk disables pinmux initialization. + */ + if (!cgpio->quirks->skip_init) { + iowrite32(GENMASK(num_gpios - 1, 0), + cgpio->regs + CDNS_GPIO_DIRECTION_MODE); + } =20 config.dev =3D &pdev->dev; config.sz =3D 4; @@ -240,9 +278,11 @@ static int cdns_gpio_probe(struct platform_device *pde= v) /* * Enable gpio outputs, ignored for input direction */ - iowrite32(GENMASK(num_gpios - 1, 0), - cgpio->regs + CDNS_GPIO_OUTPUT_EN); - iowrite32(0, cgpio->regs + CDNS_GPIO_BYPASS_MODE); + if (!cgpio->quirks->skip_init) { + iowrite32(GENMASK(num_gpios - 1, 0), + cgpio->regs + CDNS_GPIO_OUTPUT_EN); + iowrite32(0, cgpio->regs + CDNS_GPIO_BYPASS_MODE); + } =20 platform_set_drvdata(pdev, cgpio); return 0; @@ -260,12 +300,6 @@ static void cdns_gpio_remove(struct platform_device *p= dev) iowrite32(cgpio->bypass_orig, cgpio->regs + CDNS_GPIO_BYPASS_MODE); } =20 -static const struct of_device_id cdns_of_ids[] =3D { - { .compatible =3D "cdns,gpio-r1p02" }, - { /* sentinel */ }, -}; -MODULE_DEVICE_TABLE(of, cdns_of_ids); - static struct platform_driver cdns_gpio_driver =3D { .driver =3D { .name =3D "cdns-gpio", --=20 2.34.1