From patchwork Thu Nov 9 10:05:58 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chen-Yu Tsai X-Patchwork-Id: 742954 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0887113FE3 for ; Thu, 9 Nov 2023 10:06:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="RxQLjM2b" Received: from mail-pl1-x631.google.com (mail-pl1-x631.google.com [IPv6:2607:f8b0:4864:20::631]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5EA662D51 for ; Thu, 9 Nov 2023 02:06:45 -0800 (PST) Received: by mail-pl1-x631.google.com with SMTP id d9443c01a7336-1cc53d0030fso6522205ad.0 for ; Thu, 09 Nov 2023 02:06:45 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1699524405; x=1700129205; darn=vger.kernel.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=DGm2vHynu/hBFToljMIoyOJ5nVIf243JSwQjqrxxy/0=; b=RxQLjM2bpQKhpTuVZYebaJEIhWTLLYFe2dDFIchDI28Yf0eDype1TS7wThG0GTEenH qlbre4oclTVVYs6pRFJZ2NZVUOLMadbJhxKxUTln0w8sak6nNsXVQZ1gKipnx0fun9E7 3+T8Fnpl1WI07B0G3Cylkf8Qs3GBiwsmN7Wz4= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1699524405; x=1700129205; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=DGm2vHynu/hBFToljMIoyOJ5nVIf243JSwQjqrxxy/0=; b=QvAp15znK07uSNF1xgABNNosDy2Pe4SoBqXS25xE1mEGquD9ysNduoGv0Xzk/pE/c9 Td5KsITwIY/OmmCOEBE+1jN+DXur22f++1fKmSuTfkB3XR6twGYp3lvnRKNojI/Sazhu Ye4mMv4ao/3rxSSEf7mBeqr39sLaGLYak1lxhUGHz7X8iNv+5+AehZnrv+sVyPHgKhya hLJ8qviVNwjXlT6nCiXEl57q9E1V2J5OsLV2voeYNITEMbyUOOQTGCixePhR4vVG/N0o dYFy+WCib+pQHkIv4PNCI7NljqLjBQGcJMEgALT3uHMef2mSOBbvjWr1c6ZqxiofPyho qdXA== X-Gm-Message-State: AOJu0Yxgvy+n8t/8LrdfNXE9jFaWHyBoXpjr1O6WSo6o8ILiNyODsusv c7r783WNl75dWiFTVt6NIQqIvA== X-Google-Smtp-Source: AGHT+IFiKBNutMsj7ANOubArOU/tBBm0unUxGA8equMZgzL/JO0wpYcbiQ5Wq/R+556TKcVcpFKnlQ== X-Received: by 2002:a17:902:ec89:b0:1cc:436f:70c2 with SMTP id x9-20020a170902ec8900b001cc436f70c2mr7534166plg.9.1699524404876; Thu, 09 Nov 2023 02:06:44 -0800 (PST) Received: from wenstp920.tpe.corp.google.com ([2401:fa00:1:10:6f57:d4c:468c:5daf]) by smtp.gmail.com with ESMTPSA id c13-20020a170902d48d00b001c60ba709b7sm3127511plg.125.2023.11.09.02.06.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 09 Nov 2023 02:06:44 -0800 (PST) From: Chen-Yu Tsai To: Rob Herring , Frank Rowand , Krzysztof Kozlowski , Conor Dooley , Matthias Brugger , AngeloGioacchino Del Regno Cc: Hsin-Yi Wang , Dmitry Torokhov , andriy.shevchenko@linux.intel.com, Jiri Kosina , linus.walleij@linaro.org, broonie@kernel.org, gregkh@linuxfoundation.org, hdegoede@redhat.com, james.clark@arm.com, james@equiv.tech, keescook@chromium.org, petr.tesarik.ext@huawei.com, rafael@kernel.org, tglx@linutronix.de, Jeff LaBundy , linux-input@vger.kernel.org, Chen-Yu Tsai , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org, Douglas Anderson , Johan Hovold Subject: [RFC PATCH v2 1/7] of: base: Add of_device_is_fail Date: Thu, 9 Nov 2023 18:05:58 +0800 Message-ID: <20231109100606.1245545-2-wenst@chromium.org> X-Mailer: git-send-email 2.42.0.869.gea05f2083d-goog In-Reply-To: <20231109100606.1245545-1-wenst@chromium.org> References: <20231109100606.1245545-1-wenst@chromium.org> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 In some cases we want to check that a device is not only unavailable, but specifically marked as "fail". This will be used in a following change in the hardware prober driver. Signed-off-by: Chen-Yu Tsai --- drivers/of/base.c | 20 ++++++++++++++++++++ include/linux/of.h | 6 ++++++ 2 files changed, 26 insertions(+) diff --git a/drivers/of/base.c b/drivers/of/base.c index 8d93cb6ea9cd..2726e5dce1bf 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -486,6 +486,26 @@ static bool __of_device_is_fail(const struct device_node *device) return !strcmp(status, "fail") || !strncmp(status, "fail-", 5); } +/** + * of_device_is_fail - check if a device has status "fail" or "fail-..." + * + * @device: Node to check status for + * + * Return: True if the status property is set to "fail" or "fail-..." (for any + * error code suffix), false otherwise + */ +bool of_device_is_fail(const struct device_node *device) +{ + unsigned long flags; + bool res; + + raw_spin_lock_irqsave(&devtree_lock, flags); + res = __of_device_is_fail(device); + raw_spin_unlock_irqrestore(&devtree_lock, flags); + return res; +} +EXPORT_SYMBOL(of_device_is_fail); + /** * of_device_is_big_endian - check if a device has BE registers * diff --git a/include/linux/of.h b/include/linux/of.h index 6a9ddf20e79a..463fbf0072bd 100644 --- a/include/linux/of.h +++ b/include/linux/of.h @@ -350,6 +350,7 @@ extern int of_device_is_compatible(const struct device_node *device, extern int of_device_compatible_match(const struct device_node *device, const char *const *compat); extern bool of_device_is_available(const struct device_node *device); +extern bool of_device_is_fail(const struct device_node *device); extern bool of_device_is_big_endian(const struct device_node *device); extern const void *of_get_property(const struct device_node *node, const char *name, @@ -584,6 +585,11 @@ static inline bool of_device_is_available(const struct device_node *device) return false; } +static inline bool of_device_is_fail(const struct device_node *device) +{ + return false; +} + static inline bool of_device_is_big_endian(const struct device_node *device) { return false;