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Message-Id: <201203140751.30747.marek.vasut@gmail.com>
Date: Wed, 14 Mar 2012 07:51:30 +0100
From: Marek Vasut <marek.vasut@...il.com>
To: linux-arm-kernel@...ts.infradead.org
Cc: Dong Aisheng <aisheng.dong@...escale.com>,
Rob Herring <robherring2@...il.com>,
vinod.koul@...ux.intel.com, devicetree-discuss@...ts.ozlabs.org,
linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
rob.herring@...xeda.com, grant.likely@...retlab.ca,
rdunlap@...otime.net, shawn.guo@...escale.com,
kernel@...gutronix.de, cjb@...top.org,
Dong Aisheng <b29396@...escale.com>, s.hauer@...gutronix.de
Subject: Re: [PATCH v1 1/5] ARM: imx28: add basic dt support
Dear Dong Aisheng,
> On Tue, Mar 13, 2012 at 09:35:43AM -0500, Rob Herring wrote:
> > On 03/13/2012 03:47 AM, Dong Aisheng wrote:
> > > From: Dong Aisheng <dong.aisheng@...aro.org>
> > >
> > > This patch includes basic dt support which can boot via nfs rootfs.
> > >
> > > Signed-off-by: Dong Aisheng <dong.aisheng@...aro.org>
> > > ---
> > >
> > > Documentation/devicetree/bindings/arm/fsl.txt | 4 +
> > > arch/arm/boot/dts/imx28-evk.dts | 31 +++++++++
> > > arch/arm/boot/dts/imx28.dtsi | 88
> > > +++++++++++++++++++++++++ arch/arm/mach-mxs/Kconfig
> > > | 9 +++
> > > arch/arm/mach-mxs/Makefile | 1 +
> > > arch/arm/mach-mxs/imx28-dt.c | 67
> > > +++++++++++++++++++ 6 files changed, 200 insertions(+), 0
> > > deletions(-)
>
> ....
>
> > > + interrupts = <47>;
> > > + };
> > > + };
> > > + };
> > > +
> > > + ahb@...80000 {
> > > + compatible = "simple-bus";
> > > + #address-cells = <1>;
> > > + #size-cells = <1>;
> > > + reg = <0x80080000 0x80000>;
> > > + ranges;
> > > +
> > > + fec@...f0000 {
> > > + compatible = "fsl,imx28-fec";
> > > + reg = <0x800f0000 0x4000>;
> >
> > This too IIRC.
>
> The size is 16KB/0x4000 in iMX28 spec. :)
Agreed, the memory map is slightly non-standard.
>
> > > + interrupts = <101>;
> > > + status = "disabled";
> > > + };
> > > +
> > > + fec@...f4000 {
> > > + compatible = "fsl,imx28-fec";
> > > + reg = <0x800f4000 0x4000>;
> > > + interrupts = <102>;
> > > + status = "disabled";
> > > + };
> > > +
> > > + };
> > > +};
> > > diff --git a/arch/arm/mach-mxs/Kconfig b/arch/arm/mach-mxs/Kconfig
> > > index c57f996..6ab66af 100644
> > > --- a/arch/arm/mach-mxs/Kconfig
> > > +++ b/arch/arm/mach-mxs/Kconfig
> > > @@ -17,6 +17,15 @@ config SOC_IMX28
> > >
> > > comment "MXS platforms:"
> > >
> > > +config MACH_IMX28_DT
> >
> > Perhaps this should be more generic like MACH_MXS_DT to eventually
> > support MX23 as well?
>
> I just did like the imx ways.
> But yes if we see the need when do imx23 dt support.
Let's do it all in one swipe, there's not so much difference between these two
chips.
>
> > > + bool "Support i.MX28 platforms from device tree"
> > > + select SOC_IMX28
> > > + select USE_OF
> > > + select MACH_MX28EVK
> >
> > This should not be selected here.
>
> Like other imx soc dt board files, the imx28-dt.c may need to use some bits
> like pinmux in mx28evk.c board file.
>
> Yes, currently i can remove it since it is using uboot pinmux setting.
> But when add other devices support which is not covered in u-boot like
> flexcan, i may need to use non-dt board's pinmux setting.
> So maybe we can keep it first and remove it when totally not dependent
> on non-dt files.
I'd be all in for the "decremental approach" -- keep in whatever is needed and
remove is as it becomes redundant.
>
> > > + * The code contained herein is licensed under the GNU General Public
> > > + * License. You may obtain a copy of the GNU General Public License
> > > + * Version 2 or later at the following locations:
> > > + *
> > > + * http://www.opensource.org/licenses/gpl-license.html
> > > + * http://www.gnu.org/copyleft/gpl.html
> > > + */
> > > +
> > > +#include <linux/init.h>
> > > +#include <linux/irqdomain.h>
> > > +#include <linux/of_irq.h>
> > > +#include <linux/of_platform.h>
> > > +#include <asm/mach/arch.h>
> > > +#include <asm/mach/time.h>
> > > +#include <mach/common.h>
> > > +#include <mach/mx28.h>
> > > +
> > > +static const struct of_dev_auxdata imx28_auxdata_lookup[] __initconst
> > > = { + OF_DEV_AUXDATA("arm,pl011", MX28_DUART_BASE_ADDR, "duart",
> > > NULL), + OF_DEV_AUXDATA("fsl,imx28-fec", MX28_ENET_MAC0_BASE_ADDR,
> > > "imx28-fec.0", NULL), + OF_DEV_AUXDATA("fsl,imx28-fec",
> > > MX28_ENET_MAC1_BASE_ADDR, "imx28-fec.1", NULL),
> >
> > Why do you need the old names?
>
> To keep align with the old clocks.
> See arch/arm/mach-mxs/clock-mx28.c:
> _REGISTER_CLOCK("imx28-fec.0", NULL, fec_clk)
> _REGISTER_CLOCK("imx28-fec.1", NULL, fec_clk)
> Is there any better way to avoid this?
>
> > > + { /* sentinel */ }
> > > +};
> > > +
> > > +static void __init imx28_init(void)
> > > +{
> > > + of_platform_populate(NULL, of_default_bus_match_table,
> > > + imx28_auxdata_lookup, NULL);
> > > +}
> > > +
> > > +static const struct of_device_id icoll_of_match[] __initconst = {
> > > + { .compatible = "fsl,imx28-icoll", },
> > > + {},
> > > +};
> > > +
> > > +static void __init imx28_dt_init_irq(void)
> > > +{
> > > + irq_domain_generate_simple(icoll_of_match, MX28_ICOLL_BASE_ADDR, 0);
> >
> > Please do "proper" domain support for the interrupt controller and use
> > of_irq_init.
>
> Ok, i will see it.
>
> For others, will fix them all.
> Thanks for the review.
>
> Regards
> Dong Aisheng
Best regards,
Marek Vasut
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