Return-Path: Return-path: Received: from bh-25.webhostbox.net ([208.91.199.152]:40547 "EHLO bh-25.webhostbox.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754667AbdFXWRu (ORCPT ); Sat, 24 Jun 2017 18:17:50 -0400 Date: Sat, 24 Jun 2017 15:17:47 -0700 From: Guenter Roeck To: Christopher Bostic Cc: wim@iguana.be, joel@jms.id.au, linux-kernel@vger.kernel.org, linux-watchdog@vger.kernel.org, andrew@aj.id.au Subject: Re: [2/2] drivers/watchdog: ASPEED reference dev tree properties for config Message-ID: <20170624221747.GA10038@roeck-us.net> References: <20170613203818.17399-3-cbostic@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20170613203818.17399-3-cbostic@linux.vnet.ibm.com> Sender: linux-watchdog-owner@vger.kernel.org List-Id: linux-watchdog@vger.kernel.org On Tue, Jun 13, 2017 at 03:38:18PM -0500, Christopher Bostic wrote: > Reference the system device tree when configuring the watchdog. > Configure for external signal generation if optional attribute > 'external-signal' is present in device tree. Configure for > reset system after timeout if the optional attribute > 'no-system-reset' is not present. Disabling system reset may be > required in situations where one of the other watchdogs in the > systems is responsible for this. > > Signed-off-by: Christopher Bostic > --- > drivers/watchdog/aspeed_wdt.c | 13 +++++++++++-- > 1 file changed, 11 insertions(+), 2 deletions(-) > > diff --git a/drivers/watchdog/aspeed_wdt.c b/drivers/watchdog/aspeed_wdt.c > index 1c65258..9deb4be 100644 > --- a/drivers/watchdog/aspeed_wdt.c > +++ b/drivers/watchdog/aspeed_wdt.c > @@ -140,6 +140,7 @@ static int aspeed_wdt_probe(struct platform_device *pdev) > { > struct aspeed_wdt *wdt; > struct resource *res; > + struct device_node *np; > int ret; > > wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL); > @@ -170,8 +171,16 @@ static int aspeed_wdt_probe(struct platform_device *pdev) > * the SOC and not the full chip > */ > wdt->ctrl = WDT_CTRL_RESET_MODE_SOC | > - WDT_CTRL_1MHZ_CLK | > - WDT_CTRL_RESET_SYSTEM; > + WDT_CTRL_1MHZ_CLK; > + > + np = pdev->dev.of_node; > + if (np && !of_get_property(np, "no-system-reset", NULL)) > + wdt->ctrl |= WDT_CTRL_RESET_SYSTEM; > + Please use of_property_read_bool(). Also, checking np for NULL is unnecessary since the called function does that. Note that the above code as written is wrong - if np is NULL, WDT_CTRL_RESET_SYSTEM will no longer be set. The new properties should probably start with "aspeed," but I'll leave that up to DT maintainers to decide. > + if (np && of_get_property(np, "external-signal", NULL)) > + wdt->ctrl |= WDT_CTRL_WDT_EXT; > + > + writel(wdt->ctrl, wdt->base + WDT_CTRL); > > if (readl(wdt->base + WDT_CTRL) & WDT_CTRL_ENABLE) { > aspeed_wdt_start(&wdt->wdd);