linux-kernel - Re: [PATCH] irqchip/renesas-intc-irqpin: Improve clock error handling and reporting

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Date:	Tue, 24 Nov 2015 16:30:49 +0000
From:	Jason Cooper <jason@...edaemon.net>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Geert Uytterhoeven <geert+renesas@...der.be>,
	Thomas Gleixner <tglx@...utronix.de>,
	Marc Zyngier <marc.zyngier@....com>,
	Magnus Damm <magnus.damm@...il.com>,
	Linux-sh list <linux-sh@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] irqchip/renesas-intc-irqpin: Improve clock error
 handling and reporting

Hi Geert,

On Tue, Nov 24, 2015 at 04:39:26PM +0100, Geert Uytterhoeven wrote:
> On Tue, Nov 24, 2015 at 4:19 PM, Jason Cooper <jason@...edaemon.net> wrote:
> > On Tue, Nov 24, 2015 at 04:08:13PM +0100, Geert Uytterhoeven wrote:
> >> If the Renesas External IRQ Pin driver cannot find a functional clock,
> >> it prints a warning, .e.g.
> >>
> >>     renesas_intc_irqpin fe78001c.interrupt-controller: unable to get clock
> >>
> >> and continues, as the clock is optional, depending on the SoC type.
> >> This warning may confuse users.
> >>
> >> To fix this, add a flag to indicate that the clock is mandatory or
> >> optional, and add a few more compatible entries:
> >>   - If the clock is mandatory (on R-Mobile A1 or SH-Mobile AG5), a
> >>     missing clock is now treated as a fatal error,
> >>   - If the clock is optional (on R-Car Gen1, or using the generic
> >>     "renesas,intc-irqpin" compatible value), the warning is no longer
> >>     printed.
> >>
> >> This requires making struct intc_irqpin_irlm_config more generic by
> >> renaming it to intc_irqpin_config, and adding a flag to indicate if IRLM
> >> is needed.
> >> The new clock flag is merged with the existing shared_irqs boolean into
> >> a bitfield to save space.
> >>
> >> Suggested-by: Magnus Damm <magnus.damm@...il.com>
> >> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> >> ---
> >> Tested on
> >>   - r8a7779/marzen (no functional clock),
> >>   - r8a7740/armadillo (with and without mandatory functional clock),
> >>   - sh73a0/kzm9g (with and without mandatory functional clock).
> >>
> >>  drivers/irqchip/irq-renesas-intc-irqpin.c | 45 ++++++++++++++++++++++---------
> >>  1 file changed, 33 insertions(+), 12 deletions(-)
> >
> > I'll pick up this a the previous series you just sent (fyi: tglx).
> 
> Thanks!
> 
> >> diff --git a/drivers/irqchip/irq-renesas-intc-irqpin.c b/drivers/irqchip/irq-renesas-intc-irqpin.c
> >> index 7f6cf19aa6ac00d7..713177d97c7aa0b6 100644
> >> --- a/drivers/irqchip/irq-renesas-intc-irqpin.c
> >> +++ b/drivers/irqchip/irq-renesas-intc-irqpin.c
> >> @@ -79,12 +79,15 @@ struct intc_irqpin_priv {
> >>       struct irq_chip irq_chip;
> >>       struct irq_domain *irq_domain;
> >>       struct clk *clk;
> >> -     bool shared_irqs;
> >> +     unsigned shared_irqs:1;
> >> +     unsigned needs_clk:1;
> >>       u8 shared_irq_mask;
> >>  };
> >>
> >> -struct intc_irqpin_irlm_config {
> >> +struct intc_irqpin_config {
> >>       unsigned int irlm_bit;
> >> +     unsigned needs_irlm:1;
> >> +     unsigned needs_clk:1;
> >>  };
> >
> > Why not just stick with bool?  Changing shared_irqs -> has_shared_irqs?
> 
> That's another option. It depends on how many flags we will add in the
> future...

Nope, you're right.

> >>  static unsigned long intc_irqpin_read32(void __iomem *iomem)
> >> @@ -359,8 +362,15 @@ static const struct irq_domain_ops intc_irqpin_irq_domain_ops = {
> >>       .xlate  = irq_domain_xlate_twocell,
> >>  };
> >>
> >> -static const struct intc_irqpin_irlm_config intc_irqpin_irlm_r8a777x = {
> >> +static const struct intc_irqpin_config intc_irqpin_irlm_r8a777x = {
> >>       .irlm_bit = 23, /* ICR0.IRLM0 */
> >> +     .needs_irlm = 1,
> >> +     .needs_clk = 0,
> >> +};
> >> +
> >> +static const struct intc_irqpin_config intc_irqpin_rmobile = {
> >> +     .needs_irlm = 0,
> >> +     .needs_clk = 1,
> >>  };
> >>
> >>  static const struct of_device_id intc_irqpin_dt_ids[] = {
> >> @@ -369,12 +379,17 @@ static const struct of_device_id intc_irqpin_dt_ids[] = {
> >>         .data = &intc_irqpin_irlm_r8a777x },
> >>       { .compatible = "renesas,intc-irqpin-r8a7779",
> >>         .data = &intc_irqpin_irlm_r8a777x },
> >> +     { .compatible = "renesas,intc-irqpin-r8a7740",
> >> +       .data = &intc_irqpin_rmobile },
> >> +     { .compatible = "renesas,intc-irqpin-sh73a0",
> >> +       .data = &intc_irqpin_rmobile },
> >>       {},
> >>  };
> >>  MODULE_DEVICE_TABLE(of, intc_irqpin_dt_ids);
> >
> > Add these compatibles and the clock requirement info to the devicetree
> > binding?
> 
> Already there, cfr.
> Documentation/devicetree/bindings/interrupt-controller/renesas,intc-irqpin.txt
> The clock being mandatory just wasn't enforced.

Perfect.

thx,

Jason.
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