From mboxrd@z Thu Jan 1 00:00:00 1970 From: daniel.lezcano@linaro.org (Daniel Lezcano) Date: Wed, 20 Nov 2013 00:33:09 +0100 Subject: [PATCH 1/2] ARM: ux500: decomission the non-DT MTU init sequence In-Reply-To: References: <1384896471-9384-1-git-send-email-linus.walleij@linaro.org> <528BE8F2.3030507@linaro.org> Message-ID: <528BF535.1030504@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 11/19/2013 11:55 PM, Linus Walleij wrote: > On Tue, Nov 19, 2013 at 11:40 PM, Daniel Lezcano > wrote: >> On 11/19/2013 10:27 PM, Linus Walleij wrote: > >>> - if (!of_have_populated_dt()) >>> - nmdk_timer_init(mtu_timer_base, IRQ_MTU0); >> >> If no timer have been defined in the dt [or wrongly defined], is there a >> message to tell the user what is wrong ? > > Isn't that a question to be asked about a whole lot of such > clocksource drivers and ARM platforms? Yes, I did the comment based on your patch but I agree it must be addressed in a global manner. > Most DT-only ARM platforms rely on > arch/arm/kernel/time.c to call clocksource_of_init() if the > machine_desc->init_time() hook is not set and has zero > code to handle any such situation. > > So I guess what you're asking is whether we should patch > clocksource_of_init() to warn if it cannot find any > matching clock sources, like this: > > From e55cf038b238d96b28d9fb01b5b6cdf345990d53 Mon Sep 17 00:00:00 2001 > From: Linus Walleij > Date: Tue, 19 Nov 2013 23:52:56 +0100 > Subject: [PATCH] clksrc-of: warn if no clock sources are found > > Many platforms rely on clocksource_of_init() being implicitly > called for registering clock sources and will get zero warnings > if no working clock source is available. Let's print a critical > error message if no clock source is found. > > Signed-off-by: Linus Walleij Yes, it sounds right to do this. Thanks ! -- Daniel > --- > drivers/clocksource/clksrc-of.c | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/drivers/clocksource/clksrc-of.c b/drivers/clocksource/clksrc-of.c > index 35639cf4e5a2..a30b42c3ac3b 100644 > --- a/drivers/clocksource/clksrc-of.c > +++ b/drivers/clocksource/clksrc-of.c > @@ -28,6 +28,7 @@ void __init clocksource_of_init(void) > struct device_node *np; > const struct of_device_id *match; > clocksource_of_init_fn init_func; > + unsigned clocksources = 0; > > for_each_matching_node_and_match(np, __clksrc_of_table, &match) { > if (!of_device_is_available(np)) > @@ -36,5 +37,8 @@ void __init clocksource_of_init(void) > init_func = match->data; > init_func(np); > of_node_put(np); > + clocksources++; > } > + if (!clocksources) > + pr_crit("%s: no matching clocksources found\n", __func__); > } > -- Linaro.org ? Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog