From patchwork Tue Oct 15 16:20:43 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Lad, Prabhakar" X-Patchwork-Id: 835594 Received: from mail-lf1-f44.google.com (mail-lf1-f44.google.com [209.85.167.44]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E7E8D1714BE; Tue, 15 Oct 2024 16:21:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.44 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729009285; cv=none; b=KTw6okwYVssVWdP0A3ehbxTq5GIwEct0406Q2FGEkhISoTjULbGTrOtxbCbph9IMta5bMnFE9o+gRkZ7QPaR7gmmhQGjYaHO/yI30SaIl9Fs66eD/8Bfllj5cNPlS1qCniZ1mTNlwG0X+omwj3aS0zwYt4cpAs1ktWA3r3Jb0qc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729009285; c=relaxed/simple; bh=6NEO3vbuN+t5fT74F3+Wb2C+YHLJ0N/rpcZ6snYcpbU=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=uGiEaJKVInozAO+639VMmkRbHDG5TqlaNW6eatVW8HWn1CBizRNm7PPHqZRvFbJFPh4Y3vEmlxrp/VR25eiMquTPr3g8sjYd1xpexKBxvmov9n9k1XG0G0l+eDyCtV0K8G/5e1im2QjmJ6PsVkYRbohVVvopMJbCYwe8kSSxs+k= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=hOX+3JVU; arc=none smtp.client-ip=209.85.167.44 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="hOX+3JVU" Received: by mail-lf1-f44.google.com with SMTP id 2adb3069b0e04-539983beb19so5968051e87.3; Tue, 15 Oct 2024 09:21:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1729009282; x=1729614082; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=LAWUM9s5lyGhWTb1ehJ6NHCU3ChMEB/laYBZwYTZb00=; b=hOX+3JVUmocfB5aSVim+WZQnuoYrAYO4qY1eFS0S/kWgRty3NRrRj47z/naehLhCcj 9yG+FzKGyWG8AWwxkWlK21N+aBHs7qg6oepqFXKWNogrGSkj5mRuFekhna4R16gPRAE8 33GuqleRiJZP2a4RJ0Y8kLQ31WMONLCl87jXQBwB1FHJ9X0/x9tEQyKnN8StXAcp7Gsn DnM5kQjENf95XZjuPY0tPvwS3E43LUYlqnOAvL2S0WVuBc15kpsv3DCzIGAtr7S7k0XJ mi7v2vSwdSTmUCsYSRYMfoutE4bXiydIRFbvqRR4azuv9v1UZhTP2t8GN8QamFnmIcMe wcNQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1729009282; x=1729614082; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=LAWUM9s5lyGhWTb1ehJ6NHCU3ChMEB/laYBZwYTZb00=; b=qYQiFgVy1gkiXqOBRhrm36/kJrjcI6V3hnkVGAEY+/+YGNILP1T1vGHBLYuO4dRpHb J26ra2fmV5hqukEjXpOHUoPXCb0aHZND+vP2Dz6QQBST0QAEZjKA3qNJEfG//lmRK0cq VkWtMyTqZDXtf93xhkw8oTNPrtQUczj/VE9omBuRyrvuJjHvC6Q9aVTWtKbwMqxBZOZs kCr6VsT9DdLAa4f+zN8OyvgAjDSNmJ6/FD7viTlVFgLwGOtdA1x9PsF5CobuxNMKYstY 8YUCEaLjpdMXk7Sn0woemI4fZ/k7vumOSZZZgr9jJUcIrUN9pojCj+2X7GahDajjBc7L WjCw== X-Forwarded-Encrypted: i=1; AJvYcCVHkwt1QvMV440MbSnCwvt0wmpeTa9eT1ZdCK4FTEclz8ve9GYjDDx8rN4EEFIZaa3jP99W0Vsnv1OO@vger.kernel.org, AJvYcCXlbxB/dF8NopZ8E0DCZbq50Q9CIa09svZuSqlfPHaZtOrxqaa6nEgRDcyeVDnyQKq+SX8GLUTyQcTuh545ty+iZoY=@vger.kernel.org X-Gm-Message-State: AOJu0YxXOB5WaPS/qGR3miQ5nTrj6U/DKqk9UX+a5XUgi3TIYJsPTy4k zFHvBbwp8hB+dTrMPT/DOl5DPTo1Hyazj++Y3Zrb+r8m4KNHDUrD X-Google-Smtp-Source: AGHT+IFal2H6gY5olqIuu6+pF6H3H9Cp0rg+2bZLSTyU8liwGiN2tKc7WP1k4NKaLVIwTtSUr+VchA== X-Received: by 2002:ac2:4c53:0:b0:539:9720:99d4 with SMTP id 2adb3069b0e04-539da4e2598mr7779312e87.28.1729009281639; Tue, 15 Oct 2024 09:21:21 -0700 (PDT) Received: from prasmi.home ([2a00:23c8:2500:a01:2595:4364:d152:dff3]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4313f56eab2sm22288325e9.26.2024.10.15.09.21.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 15 Oct 2024 09:21:20 -0700 (PDT) From: Prabhakar X-Google-Original-From: Prabhakar To: Linus Walleij , Bartosz Golaszewski , Geert Uytterhoeven Cc: linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, linux-renesas-soc@vger.kernel.org, Prabhakar , Biju Das , Fabrizio Castro , Lad Prabhakar Subject: [RFC PATCH] pinctrl: pinmux: Introduce API to check if a pin is requested Date: Tue, 15 Oct 2024 17:20:43 +0100 Message-ID: <20241015162043.254517-1-prabhakar.mahadev-lad.rj@bp.renesas.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Lad Prabhakar Introduce `pin_requestesd` API to check if a pin is currently requested. This API allows pinctrl drivers to verify whether a pin is requested or not by checking if the pin is owned by either `gpio_owner` or `mux_owner`. GPIO pins used as interrupts through the `interrupts` DT property do not follow the usual `gpio_request`/`pin_request` path, unlike GPIO pins used as interrupts via the `gpios` property. As a result, such pins were reported as `UNCLAIMED` in the `pinmux-pins` sysfs file, even though they were in use as interrupts. With the newly introduced API, pinctrl drivers can check if a pin is already requested by the pinctrl core and ensure that pin is requested during when using as irq. This helps to ensure that the `pinmux-pins` sysfs file reflects the correct status of the pin. Signed-off-by: Lad Prabhakar --- drivers/pinctrl/pinmux.c | 14 ++++++++++++++ drivers/pinctrl/pinmux.h | 5 +++++ 2 files changed, 19 insertions(+) diff --git a/drivers/pinctrl/pinmux.c b/drivers/pinctrl/pinmux.c index 02033ea1c643..19c68e174c36 100644 --- a/drivers/pinctrl/pinmux.c +++ b/drivers/pinctrl/pinmux.c @@ -99,6 +99,20 @@ bool pinmux_can_be_used_for_gpio(struct pinctrl_dev *pctldev, unsigned int pin) return !(ops->strict && !!desc->gpio_owner); } +bool pin_requestesd(struct pinctrl_dev *pctldev, int pin) +{ + struct pin_desc *desc; + + desc = pin_desc_get(pctldev, pin); + if (!desc) + return false; + + if (!desc->gpio_owner && !desc->mux_owner) + return false; + + return true; +} + /** * pin_request() - request a single pin to be muxed in, typically for GPIO * @pctldev: the associated pin controller device diff --git a/drivers/pinctrl/pinmux.h b/drivers/pinctrl/pinmux.h index 2965ec20b77f..550cb3b4c068 100644 --- a/drivers/pinctrl/pinmux.h +++ b/drivers/pinctrl/pinmux.h @@ -42,6 +42,7 @@ int pinmux_map_to_setting(const struct pinctrl_map *map, void pinmux_free_setting(const struct pinctrl_setting *setting); int pinmux_enable_setting(const struct pinctrl_setting *setting); void pinmux_disable_setting(const struct pinctrl_setting *setting); +bool pin_requestesd(struct pinctrl_dev *pctldev, int pin); #else @@ -100,6 +101,10 @@ static inline void pinmux_disable_setting(const struct pinctrl_setting *setting) { } +bool pin_requestesd(struct pinctrl_dev *pctldev, int pin) +{ + return false; +} #endif #if defined(CONFIG_PINMUX) && defined(CONFIG_DEBUG_FS)