linux-kernel - Re: [PATCH v3 5/6] bus: Add Baikal-T1 APB-bus driver

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Message-ID: <20200528131307.phopcjymtqhl2jyr@mobilestation>
Date:   Thu, 28 May 2020 16:13:07 +0300
From:   Serge Semin <Sergey.Semin@...kalelectronics.ru>
To:     Arnd Bergmann <arnd@...db.de>
CC:     Serge Semin <fancer.lancer@...il.com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Paul Burton <paulburton@...nel.org>,
        Olof Johansson <olof@...om.net>,
        Rob Herring <robh+dt@...nel.org>,
        "open list:BROADCOM NVRAM DRIVER" <linux-mips@...r.kernel.org>,
        SoC Team <soc@...nel.org>, DTML <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 5/6] bus: Add Baikal-T1 APB-bus driver

On Thu, May 28, 2020 at 02:17:17PM +0200, Arnd Bergmann wrote:
> On Tue, May 26, 2020 at 2:59 PM Serge Semin
> <Sergey.Semin@...kalelectronics.ru> wrote:
> >
> > Baikal-T1 AXI-APB bridge is used to access the SoC subsystem CSRs.
> > IO requests are routed to this bus by means of the DW AMBA 3 AXI
> > Interconnect. In case if an attempted APB transaction stays with no
> > response for a pre-defined time an interrupt occurs and the bus gets
> > freed for a next operation. This driver provides the interrupt handler
> > to detect the erroneous address, prints an error message about the
> > address fault, updates an errors counter. The counter and the APB-bus
> > operations timeout can be accessed via corresponding sysfs nodes.
> > A dedicated sysfs-node can be also used to artificially cause the
> > bus errors described above.
> >
> > Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> > Cc: Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>
> > Cc: Paul Burton <paulburton@...nel.org>
> > Cc: Olof Johansson <olof@...om.net>
> > Cc: Rob Herring <robh+dt@...nel.org>
> > Cc: linux-mips@...r.kernel.org
> > Cc: soc@...nel.org
> > Cc: devicetree@...r.kernel.org
> >
> > ---
> 
> Applied with this fixup:

I'm afraid linux/io.h is also needed here.(

-Sergey

> 
> --- a/drivers/bus/bt1-apb.c
> +++ b/drivers/bus/bt1-apb.c
> @@ -16,6 +16,7 @@
>  #include <linux/platform_device.h>
>  #include <linux/interrupt.h>
>  #include <linux/nmi.h>
> +#include <linux/of.h>
>  #include <linux/regmap.h>
>  #include <linux/clk.h>
>  #include <linux/reset.h>
> @@ -309,13 +310,13 @@ static ssize_t timeout_store(struct device *dev,
>  }
>  static DEVICE_ATTR_RW(timeout);
> 
> -static int inject_error_show(struct device *dev, struct device_attribute *attr,
> +static ssize_t inject_error_show(struct device *dev, struct
> device_attribute *attr,
>                              char *buf)
>  {
>         return scnprintf(buf, PAGE_SIZE, "Error injection: nodev irq\n");
>  }
> 
> -static int inject_error_store(struct device *dev,
> +static ssize_t inject_error_store(struct device *dev,
>                               struct device_attribute *attr,
>                               const char *data, size_t count)
>  {