linux-kernel - RE: [[LINUX PATCH v10] 2/4] memory: pl353: Add driver for arm pl353 static memory controller

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Date:   Thu, 28 Jun 2018 12:11:50 +0000
From:   Naga Sureshkumar Relli <nagasure@...inx.com>
To:     Naga Sureshkumar Relli <nagasure@...inx.com>,
        Linus Walleij <linus.walleij@...aro.org>
CC:     Boris Brezillon <boris.brezillon@...tlin.com>,
        Richard Weinberger <richard@....at>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Mark Vasut <marek.vasut@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Markus Mayer <mmayer@...adcom.com>,
        Roger Quadros <rogerq@...com>,
        Ladislav Michl <ladis@...ux-mips.org>,
        "ada@...rsis.com" <ada@...rsis.com>,
        "honghui.zhang@...iatek.com" <honghui.zhang@...iatek.com>,
        Miquèl Raynal <miquel.raynal@...tlin.com>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "nagasureshkumarrelli@...il.com" <nagasureshkumarrelli@...il.com>,
        Michal Simek <michals@...inx.com>
Subject: RE: [[LINUX PATCH v10] 2/4] memory: pl353: Add driver for arm pl353
 static memory controller

Sorry for the wrong name.

> -----Original Message-----
> From: Naga Sureshkumar Relli [mailto:nagasure@...inx.com]
> Sent: Thursday, June 28, 2018 5:41 PM
> To: Linus Walleij <linus.walleij@...aro.org>
> Cc: Boris Brezillon <boris.brezillon@...tlin.com>; Richard Weinberger <richard@....at>;
> David Woodhouse <dwmw2@...radead.org>; Brian Norris
> <computersforpeace@...il.com>; Mark Vasut <marek.vasut@...il.com>; Florian Fainelli
> <f.fainelli@...il.com>; Markus Mayer <mmayer@...adcom.com>; Roger Quadros
> <rogerq@...com>; Ladislav Michl <ladis@...ux-mips.org>; ada@...rsis.com;
> honghui.zhang@...iatek.com; Miquèl Raynal <miquel.raynal@...tlin.com>; linux-
> mtd@...ts.infradead.org; linux-kernel@...r.kernel.org; nagasureshkumarrelli@...il.com;
> Michal Simek <michals@...inx.com>
> Subject: RE: [[LINUX PATCH v10] 2/4] memory: pl353: Add driver for arm pl353 static
> memory controller
> 
> Hi Linux,
Linus.
> 
> Thanks for the review.
> 
> > -----Original Message-----
> > From: Linus Walleij [mailto:linus.walleij@...aro.org]
> > Sent: Thursday, June 28, 2018 12:19 PM
> > To: Naga Sureshkumar Relli <nagasure@...inx.com>
> > Cc: Boris Brezillon <boris.brezillon@...tlin.com>; Richard Weinberger
> > <richard@....at>; David Woodhouse <dwmw2@...radead.org>; Brian Norris
> > <computersforpeace@...il.com>; Mark Vasut <marek.vasut@...il.com>;
> > Florian Fainelli <f.fainelli@...il.com>; Markus Mayer
> > <mmayer@...adcom.com>; Roger Quadros <rogerq@...com>; Ladislav Michl
> > <ladis@...ux-mips.org>; ada@...rsis.com; honghui.zhang@...iatek.com;
> > Miquèl Raynal <miquel.raynal@...tlin.com>; linux-
> > mtd@...ts.infradead.org; linux-kernel@...r.kernel.org;
> > nagasureshkumarrelli@...il.com; Michal Simek <michals@...inx.com>
> > Subject: Re: [[LINUX PATCH v10] 2/4] memory: pl353: Add driver for arm
> > pl353 static memory controller
> >
> > On Thu, Jun 21, 2018 at 8:43 AM Naga Sureshkumar Relli
> > <naga.sureshkumar.relli@...inx.com> wrote:
> >
> > > Add driver for arm pl353 static memory controller. This controller
> > > is used in Xilinx Zynq SoC for interfacing the NAND and NOR/SRAM memory devices.
> > >
> > > Signed-off-by: Naga Sureshkumar Relli
> > > <naga.sureshkumar.relli@...inx.com>
> >
> > (...)
> >
> > > +config PL353_SMC
> > > +       tristate "ARM PL35X Static Memory Controller(SMC) driver"
> > > +       default y
> > > +       depends on ARM
> > > +       depends on ARCH_ZYNQ
> >
> > depends on ARM_AMBA
> Ok. I will add it next version.
> >
> > > +#include <linux/platform_device.h>
> >
> > This is a PrimeCell with the ARM primecell ID registers specified, so
> > it should not use platform device.
> Thanks for pointing these drivers. Let me go through these.
> 
> >
> > Use <linux/amba/bus.h>
> >
> > It further needs to match on these magic values (found in
> > 0xfe0 etc) and use the name "apb_pclk" for the peripheral
> > (silicon) clock.
> >
> > See examples such as:
> > drivers/mmc/host/mmci.c
> > drivers/tty/serial/amba-pl011.c
> > drivers/video/fbdev/amba-clcd.c
> > drivers/hwtracing/coresight/*
> > etc for examples.
> >
> > Also see and reference the special PrimeCell DT bindings:
> > Documentation/devicetree/bindings/arm/primecell.txt
> Ok. I will go through these bindings once.
> >
> > Yours,
> > Linus Walleij
> 
> Thank for your review.
> 
> Regards,
> Naga Sureshkumar Relli.