From patchwork Mon Aug 26 10:46:33 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ivan Mikhaylov X-Patchwork-Id: 11114367 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 9486618B7 for ; Mon, 26 Aug 2019 10:47:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 66C4C23407 for ; Mon, 26 Aug 2019 10:47:22 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=yadro.com header.i=@yadro.com header.b="JdsbpHV5" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729691AbfHZKrJ (ORCPT ); Mon, 26 Aug 2019 06:47:09 -0400 Received: from mta-02.yadro.com ([89.207.88.252]:52242 "EHLO mta-01.yadro.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726616AbfHZKrI (ORCPT ); Mon, 26 Aug 2019 06:47:08 -0400 Received: from localhost (unknown [127.0.0.1]) by mta-01.yadro.com (Postfix) with ESMTP id 2DF3E4120B; Mon, 26 Aug 2019 10:47:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=yadro.com; h= content-type:content-type:content-transfer-encoding:mime-version :references:in-reply-to:x-mailer:message-id:date:date:subject :subject:from:from:received:received:received; s=mta-01; t= 1566816426; x=1568630827; bh=mEhEh6gAJzPJESzZ96RxoI02+oLNMejWhrw LDGL5SN0=; b=JdsbpHV50eW1ozY0YsGrdqXXY/eBmBk8KOSPxq4UK24qqWxfMUj 1h2hhuy4ecIqUaHGxJ3fWIVq/9Ty5Pj9X5XD8Rn3Xowjpi0iMT1BIl+ZppDnmg/y 1cpx5iYGcD0wgS3nChydkAymFX3TBEJ4GlXBLxxweau3Cw0kFKqc/LZY= X-Virus-Scanned: amavisd-new at yadro.com Received: from mta-01.yadro.com ([127.0.0.1]) by localhost (mta-01.yadro.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id a9peDFjoqBtY; Mon, 26 Aug 2019 13:47:06 +0300 (MSK) Received: from T-EXCH-02.corp.yadro.com (t-exch-02.corp.yadro.com [172.17.10.102]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by mta-01.yadro.com (Postfix) with ESMTPS id C2DD941206; Mon, 26 Aug 2019 13:47:05 +0300 (MSK) Received: from localhost.dev.yadro.com (172.17.15.69) by T-EXCH-02.corp.yadro.com (172.17.10.102) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P384) id 15.1.669.32; Mon, 26 Aug 2019 13:47:05 +0300 From: Ivan Mikhaylov To: Guenter Roeck , Wim Van Sebroeck CC: Joel Stanley , Andrew Jeffery , , , , , Alexander Amelkin , , Rob Herring , Mark Rutland , , Ivan Mikhaylov Subject: [PATCH v2 1/4] vesnin: add wdt2 section with alt-boot option Date: Mon, 26 Aug 2019 13:46:33 +0300 Message-ID: <20190826104636.19324-2-i.mikhaylov@yadro.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190826104636.19324-1-i.mikhaylov@yadro.com> References: <20190826104636.19324-1-i.mikhaylov@yadro.com> MIME-Version: 1.0 X-Originating-IP: [172.17.15.69] X-ClientProxiedBy: T-EXCH-01.corp.yadro.com (172.17.10.101) To T-EXCH-02.corp.yadro.com (172.17.10.102) Sender: linux-watchdog-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org Adds wdt2 section with 'alt-boot' option into dts for vesnin. Signed-off-by: Ivan Mikhaylov --- arch/arm/boot/dts/aspeed-bmc-opp-vesnin.dts | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/arm/boot/dts/aspeed-bmc-opp-vesnin.dts b/arch/arm/boot/dts/aspeed-bmc-opp-vesnin.dts index 0b9e29c3212e..2ee26c86a32e 100644 --- a/arch/arm/boot/dts/aspeed-bmc-opp-vesnin.dts +++ b/arch/arm/boot/dts/aspeed-bmc-opp-vesnin.dts @@ -222,3 +222,7 @@ &vuart { status = "okay"; }; + +&wdt2 { + aspeed,alt-boot; +}; From patchwork Mon Aug 26 10:46:34 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ivan Mikhaylov X-Patchwork-Id: 11114369 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id A8DDC184E for ; Mon, 26 Aug 2019 10:47:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 86D732186A for ; Mon, 26 Aug 2019 10:47:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=yadro.com header.i=@yadro.com header.b="EKztMJeU" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730749AbfHZKrW (ORCPT ); Mon, 26 Aug 2019 06:47:22 -0400 Received: from mta-02.yadro.com ([89.207.88.252]:52268 "EHLO mta-01.yadro.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728178AbfHZKrJ (ORCPT ); Mon, 26 Aug 2019 06:47:09 -0400 Received: from localhost (unknown [127.0.0.1]) by mta-01.yadro.com (Postfix) with ESMTP id 46453412D3; Mon, 26 Aug 2019 10:47:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=yadro.com; h= content-type:content-type:content-transfer-encoding:mime-version :references:in-reply-to:x-mailer:message-id:date:date:subject :subject:from:from:received:received:received; s=mta-01; t= 1566816427; x=1568630828; bh=GCxrgga2ACU49JHMFa9Qm+9SSWX1i4ngDP9 HAa9kUNA=; b=EKztMJeUFKRNF8HdpiccZefVoEvr6LQkhu6f1t5mFEl7Po/e8lK N/uIJiU2xCDRdg0V0ZLvKfIF0FA4QHK+2kos09rwohF4G+wzXZ870kd1DCNzyNmb C3Ydu5+Y7UuXJgOsHX923bXTvnXmPYCEOrdYHJqkxymw1mVmlPMbCW8A= X-Virus-Scanned: amavisd-new at yadro.com Received: from mta-01.yadro.com ([127.0.0.1]) by localhost (mta-01.yadro.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id d2sFx0aam8hD; Mon, 26 Aug 2019 13:47:07 +0300 (MSK) Received: from T-EXCH-02.corp.yadro.com (t-exch-02.corp.yadro.com [172.17.10.102]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by mta-01.yadro.com (Postfix) with ESMTPS id 4951641206; Mon, 26 Aug 2019 13:47:07 +0300 (MSK) Received: from localhost.dev.yadro.com (172.17.15.69) by T-EXCH-02.corp.yadro.com (172.17.10.102) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P384) id 15.1.669.32; Mon, 26 Aug 2019 13:47:06 +0300 From: Ivan Mikhaylov To: Guenter Roeck , Wim Van Sebroeck CC: Joel Stanley , Andrew Jeffery , , , , , Alexander Amelkin , , Rob Herring , Mark Rutland , , Ivan Mikhaylov Subject: [PATCH v2 2/4] vesnin: add secondary SPI flash chip Date: Mon, 26 Aug 2019 13:46:34 +0300 Message-ID: <20190826104636.19324-3-i.mikhaylov@yadro.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190826104636.19324-1-i.mikhaylov@yadro.com> References: <20190826104636.19324-1-i.mikhaylov@yadro.com> MIME-Version: 1.0 X-Originating-IP: [172.17.15.69] X-ClientProxiedBy: T-EXCH-01.corp.yadro.com (172.17.10.101) To T-EXCH-02.corp.yadro.com (172.17.10.102) Sender: linux-watchdog-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org Adds secondary SPI flash chip into dts for vesnin. Signed-off-by: Ivan Mikhaylov --- arch/arm/boot/dts/aspeed-bmc-opp-vesnin.dts | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/arm/boot/dts/aspeed-bmc-opp-vesnin.dts b/arch/arm/boot/dts/aspeed-bmc-opp-vesnin.dts index 2ee26c86a32e..db4cc3df61ce 100644 --- a/arch/arm/boot/dts/aspeed-bmc-opp-vesnin.dts +++ b/arch/arm/boot/dts/aspeed-bmc-opp-vesnin.dts @@ -81,6 +81,14 @@ label = "bmc"; #include "openbmc-flash-layout.dtsi" }; + + flash@1 { + status = "okay"; + reg = < 1 >; + compatible = "jedec,spi-nor"; + m25p,fast-read; + label = "alt"; + }; }; &spi { From patchwork Mon Aug 26 10:46:35 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ivan Mikhaylov X-Patchwork-Id: 11114363 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 1B56D14E5 for ; Mon, 26 Aug 2019 10:47:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E399F20828 for ; Mon, 26 Aug 2019 10:47:21 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=yadro.com header.i=@yadro.com header.b="g5fgxiQz" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730911AbfHZKrO (ORCPT ); Mon, 26 Aug 2019 06:47:14 -0400 Received: from mta-02.yadro.com ([89.207.88.252]:52294 "EHLO mta-01.yadro.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1730404AbfHZKrM (ORCPT ); Mon, 26 Aug 2019 06:47:12 -0400 Received: from localhost (unknown [127.0.0.1]) by mta-01.yadro.com (Postfix) with ESMTP id C293142EE4; Mon, 26 Aug 2019 10:47:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=yadro.com; h= content-type:content-type:content-transfer-encoding:mime-version :references:in-reply-to:x-mailer:message-id:date:date:subject :subject:from:from:received:received:received; s=mta-01; t= 1566816428; x=1568630829; bh=T3v61MWhcL+tajW673iRBJZJZpa3U3kWhy5 fA7Bo03s=; b=g5fgxiQzifxENbfepegX0ovCytuj++QE1X0IPIzM2Ed1NzuzaFL S7tqDKTg/EKYkksrsyDRQbJQs1iJ4bQJm+P1moEgZYqIT4zeEoklxAoSC5ua/pF1 B/deJA5HdF0Rhu7rEdhTUho0kcCAkEwUgsoOXPwZOu4CJQ4wqu3uUxw4= X-Virus-Scanned: amavisd-new at yadro.com Received: from mta-01.yadro.com ([127.0.0.1]) by localhost (mta-01.yadro.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6L6-vTXlq5uX; Mon, 26 Aug 2019 13:47:08 +0300 (MSK) Received: from T-EXCH-02.corp.yadro.com (t-exch-02.corp.yadro.com [172.17.10.102]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by mta-01.yadro.com (Postfix) with ESMTPS id 858C141206; Mon, 26 Aug 2019 13:47:08 +0300 (MSK) Received: from localhost.dev.yadro.com (172.17.15.69) by T-EXCH-02.corp.yadro.com (172.17.10.102) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P384) id 15.1.669.32; Mon, 26 Aug 2019 13:47:07 +0300 From: Ivan Mikhaylov To: Guenter Roeck , Wim Van Sebroeck CC: Joel Stanley , Andrew Jeffery , , , , , Alexander Amelkin , , Rob Herring , Mark Rutland , , Ivan Mikhaylov Subject: [PATCH v2 3/4] watchdog/aspeed: add support for dual boot Date: Mon, 26 Aug 2019 13:46:35 +0300 Message-ID: <20190826104636.19324-4-i.mikhaylov@yadro.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190826104636.19324-1-i.mikhaylov@yadro.com> References: <20190826104636.19324-1-i.mikhaylov@yadro.com> MIME-Version: 1.0 X-Originating-IP: [172.17.15.69] X-ClientProxiedBy: T-EXCH-01.corp.yadro.com (172.17.10.101) To T-EXCH-02.corp.yadro.com (172.17.10.102) Sender: linux-watchdog-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org Set WDT_CLEAR_TIMEOUT_AND_BOOT_CODE_SELECTION into WDT_CLEAR_TIMEOUT_STATUS to clear out boot code source and re-enable access to the primary SPI flash chip while booted via wdt2 from the alternate chip. AST2400 datasheet says: "In the 2nd flash booting mode, all the address mapping to CS0# would be re-directed to CS1#. And CS0# is not accessable under this mode. To access CS0#, firmware should clear the 2nd boot mode register in the WDT2 status register WDT30.bit[1]." Signed-off-by: Ivan Mikhaylov --- drivers/watchdog/aspeed_wdt.c | 62 ++++++++++++++++++++++++++++++++++- 1 file changed, 61 insertions(+), 1 deletion(-) diff --git a/drivers/watchdog/aspeed_wdt.c b/drivers/watchdog/aspeed_wdt.c index cc71861e033a..bbc42847c0e3 100644 --- a/drivers/watchdog/aspeed_wdt.c +++ b/drivers/watchdog/aspeed_wdt.c @@ -53,6 +53,8 @@ MODULE_DEVICE_TABLE(of, aspeed_wdt_of_table); #define WDT_CTRL_ENABLE BIT(0) #define WDT_TIMEOUT_STATUS 0x10 #define WDT_TIMEOUT_STATUS_BOOT_SECONDARY BIT(1) +#define WDT_CLEAR_TIMEOUT_STATUS 0x14 +#define WDT_CLEAR_TIMEOUT_AND_BOOT_CODE_SELECTION BIT(0) /* * WDT_RESET_WIDTH controls the characteristics of the external pulse (if @@ -165,6 +167,57 @@ static int aspeed_wdt_restart(struct watchdog_device *wdd, return 0; } +/* access_cs0 shows if cs0 is accessible, hence the reverted bit */ +static ssize_t access_cs0_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct aspeed_wdt *wdt = dev_get_drvdata(dev); + uint32_t status = readl(wdt->base + WDT_TIMEOUT_STATUS); + + return sprintf(buf, "%u\n", + !(status & WDT_TIMEOUT_STATUS_BOOT_SECONDARY)); +} + +static ssize_t access_cs0_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t size) +{ + struct aspeed_wdt *wdt = dev_get_drvdata(dev); + unsigned long val; + + if (kstrtoul(buf, 10, &val)) + return -EINVAL; + + if (val) + writel(WDT_CLEAR_TIMEOUT_AND_BOOT_CODE_SELECTION, + wdt->base + WDT_CLEAR_TIMEOUT_STATUS); + + return size; +} + +/* + * At alternate side the 'access_cs0' sysfs node provides: + * ast2400: a way to get access to the primary SPI flash chip at CS0 + * after booting from the alternate chip at CS1. + * ast2500: a way to restore the normal address mapping from + * (CS0->CS1, CS1->CS0) to (CS0->CS0, CS1->CS1). + * + * Clearing the boot code selection and timeout counter also resets to the + * initial state the chip select line mapping. When the SoC is in normal + * mapping state (i.e. booted from CS0), clearing those bits does nothing for + * both versions of the SoC. For alternate boot mode (booted from CS1 due to + * wdt2 expiration) the behavior differs as described above. + * + * This option can be used with wdt2 (watchdog1) only. + */ +static DEVICE_ATTR_RW(access_cs0); + +static struct attribute *bswitch_attrs[] = { + &dev_attr_access_cs0.attr, + NULL +}; +ATTRIBUTE_GROUPS(bswitch); + static const struct watchdog_ops aspeed_wdt_ops = { .start = aspeed_wdt_start, .stop = aspeed_wdt_stop, @@ -306,9 +359,16 @@ static int aspeed_wdt_probe(struct platform_device *pdev) } status = readl(wdt->base + WDT_TIMEOUT_STATUS); - if (status & WDT_TIMEOUT_STATUS_BOOT_SECONDARY) + if (status & WDT_TIMEOUT_STATUS_BOOT_SECONDARY) { wdt->wdd.bootstatus = WDIOF_CARDRESET; + if (of_device_is_compatible(np, "aspeed,ast2400-wdt") || + of_device_is_compatible(np, "aspeed,ast2500-wdt")) + wdt->wdd.groups = bswitch_groups; + } + + dev_set_drvdata(dev, wdt); + return devm_watchdog_register_device(dev, &wdt->wdd); } From patchwork Mon Aug 26 10:46:36 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ivan Mikhaylov X-Patchwork-Id: 11114359 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id BD02B184E for ; Mon, 26 Aug 2019 10:47:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 99CC9217F5 for ; Mon, 26 Aug 2019 10:47:14 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=yadro.com header.i=@yadro.com header.b="tV1cLjpX" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730815AbfHZKrN (ORCPT ); Mon, 26 Aug 2019 06:47:13 -0400 Received: from mta-02.yadro.com ([89.207.88.252]:52268 "EHLO mta-01.yadro.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726616AbfHZKrM (ORCPT ); Mon, 26 Aug 2019 06:47:12 -0400 Received: from localhost (unknown [127.0.0.1]) by mta-01.yadro.com (Postfix) with ESMTP id 633BB42EE5; Mon, 26 Aug 2019 10:47:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=yadro.com; h= content-type:content-type:content-transfer-encoding:mime-version :references:in-reply-to:x-mailer:message-id:date:date:subject :subject:from:from:received:received:received; s=mta-01; t= 1566816430; x=1568630831; bh=sDEjAIt5xHIASzEmtC/Trtueg2g59LDArRf QVSN+7T4=; b=tV1cLjpXjz8aSWpEAlBwXBqbEGUYEz64wHjdQ8NMfZBsIVR9O58 3bibA7Kw+Qle+KB9G+5OEy+F9J9BWaPjBmwnbdaZLK/dkfSHxNYNWNG4Fh7dQ9XY eQ5Gv7+CqXhXPG4OKlD4ZL19gDa24cUVA30hGvh7Vb7yES+t7bpuvqCw= X-Virus-Scanned: amavisd-new at yadro.com Received: from mta-01.yadro.com ([127.0.0.1]) by localhost (mta-01.yadro.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id gltpLMrPWcoY; Mon, 26 Aug 2019 13:47:10 +0300 (MSK) Received: from T-EXCH-02.corp.yadro.com (t-exch-02.corp.yadro.com [172.17.10.102]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by mta-01.yadro.com (Postfix) with ESMTPS id 64A0E42EEA; Mon, 26 Aug 2019 13:47:10 +0300 (MSK) Received: from localhost.dev.yadro.com (172.17.15.69) by T-EXCH-02.corp.yadro.com (172.17.10.102) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P384) id 15.1.669.32; Mon, 26 Aug 2019 13:47:09 +0300 From: Ivan Mikhaylov To: Guenter Roeck , Wim Van Sebroeck CC: Joel Stanley , Andrew Jeffery , , , , , Alexander Amelkin , , Rob Herring , Mark Rutland , , Ivan Mikhaylov Subject: [PATCH v2 4/4] dt-bindings/watchdog: Add access_cs0 option for alt-boot Date: Mon, 26 Aug 2019 13:46:36 +0300 Message-ID: <20190826104636.19324-5-i.mikhaylov@yadro.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190826104636.19324-1-i.mikhaylov@yadro.com> References: <20190826104636.19324-1-i.mikhaylov@yadro.com> MIME-Version: 1.0 X-Originating-IP: [172.17.15.69] X-ClientProxiedBy: T-EXCH-01.corp.yadro.com (172.17.10.101) To T-EXCH-02.corp.yadro.com (172.17.10.102) Sender: linux-watchdog-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org The option for the ast2400/2500 to get access to CS0 at runtime. Signed-off-by: Ivan Mikhaylov --- Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt b/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt index c5077a1f5cb3..023a9b578df6 100644 --- a/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt +++ b/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt @@ -34,6 +34,13 @@ Optional properties: engine is responsible for this. - aspeed,alt-boot: If property is present then boot from alternate block. + At alternate side 'access_cs0' sysfs file provides: + ast2400: a way to get access to the primary SPI flash + chip at CS0 after booting from the alternate + chip at CS1. + ast2500: a way to restore the normal address mapping from + (CS0->CS1, CS1->CS0) to (CS0->CS0, CS1->CS1). + - aspeed,external-signal: If property is present then signal is sent to external reset counter (only WDT1 and WDT2). If not specified no external signal is sent.