linux-kernel - RE: [PATCH] irqchip: xilinx: Add support for multiple instances

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Date:   Tue, 4 Feb 2020 19:08:36 +0000
From:   Mubin Usman Sayyed <MUBINUSM@...inx.com>
To:     Michal Simek <michals@...inx.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "jason@...edaemon.net" <jason@...edaemon.net>,
        "maz@...nel.org" <maz@...nel.org>,
        Michal Simek <michals@...inx.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Siva Durga Prasad Paladugu <sivadur@...inx.com>,
        Anirudha Sarangi <anirudh@...inx.com>
Subject: RE: [PATCH] irqchip: xilinx: Add support for multiple instances

Hi Michal,

> -----Original Message-----
> From: Michal Simek <michal.simek@...inx.com>
> Sent: Friday, January 31, 2020 8:06 PM
> To: Mubin Usman Sayyed <MUBINUSM@...inx.com>; tglx@...utronix.de;
> jason@...edaemon.net; maz@...nel.org; Michal Simek
> <michals@...inx.com>; linux-arm-kernel@...ts.infradead.org
> Cc: linux-kernel@...r.kernel.org; Siva Durga Prasad Paladugu
> <sivadur@...inx.com>; Anirudha Sarangi <anirudh@...inx.com>
> Subject: Re: [PATCH] irqchip: xilinx: Add support for multiple instances
> 
> On 31. 01. 20 15:18, Mubin Usman Sayyed wrote:
> > From: Mubin Sayyed <mubin.usman.sayyed@...inx.com>
> >
> > This patch adds support for multiple instances of xilinx interrupt
> > controller. Below configurations are supported by driver,
> >
> > - peripheral->xilinx-intc->xilinx-intc->gic
> > - peripheral->xilinx-intc->xilinx-intc
> >
> > Signed-off-by: Anirudha Sarangi <anirudha.sarangi@...inx.com>
> > Signed-off-by: Mubin Sayyed <mubin.usman.sayyed@...inx.com>
> > ---
> >  drivers/irqchip/irq-xilinx-intc.c | 143
> > +++++++++++++++++++++++---------------
> >  1 file changed, 87 insertions(+), 56 deletions(-)
> >
> > diff --git a/drivers/irqchip/irq-xilinx-intc.c
> > b/drivers/irqchip/irq-xilinx-intc.c
> > index e3043de..43d6e4e 100644
> > --- a/drivers/irqchip/irq-xilinx-intc.c
> > +++ b/drivers/irqchip/irq-xilinx-intc.c
> > @@ -15,10 +15,11 @@
> >  #include <linux/irqchip/chained_irq.h>  #include <linux/of_address.h>
> > #include <linux/io.h> -#include <linux/jump_label.h>  #include
> > <linux/bug.h>  #include <linux/of_irq.h>
> >
> > +static struct xintc_irq_chip *primary_intc;
> 
> nit: please place it below xintc_irq_chip.
[Mubin]:  I will fix it in v2.
> 
> > +
> >  /* No one else should require these constants, so define them locally
> here. */
> >  #define ISR 0x00			/* Interrupt Status Register */
> >  #define IPR 0x04			/* Interrupt Pending Register */
> > @@ -32,35 +33,40 @@
> >  #define MER_ME (1<<0)
> >  #define MER_HIE (1<<1)
> >
> > -static DEFINE_STATIC_KEY_FALSE(xintc_is_be);
> 
> I am playing with this driver a little bit now and I pretty much dislike remove
> this. I haven't see any configuration which mixes little and big endian
> together. That's why I prefer not to create read_fn/write_fn hooks.
[Mubin]:  Agreed,  I will remove read_fn/write_fn and use xintc_is_be in v2.

Thanks,
Mubin
> 
> Thanks,
> Michal