Re: [PATCH v1 1/5] ARM: imx28: add basic dt support

[Dong Aisheng <aisheng.dong@freescale.com>]

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@linaro.org>
> > 
> > This patch includes basic dt support which can boot via nfs rootfs.
> > 
> > Signed-off-by: Dong Aisheng <dong.aisheng@linaro.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@80080000 {
> > +		compatible = "simple-bus";
> > +		#address-cells = <1>;
> > +		#size-cells = <1>;
> > +		reg = <0x80080000 0x80000>;
> > +		ranges;
> > +
> > +		fec@800f0000 {
> > +			compatible = "fsl,imx28-fec";
> > +			reg = <0x800f0000 0x4000>;
> 
> This too IIRC.
> 
The size is 16KB/0x4000 in iMX28 spec. :)

> > +			interrupts = <101>;
> > +			status = "disabled";
> > +		};
> > +
> > +		fec@800f4000 {
> > +			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.

> > +	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.

> > + * 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