linux-kernel - Re: [PATCH v2 06/11] ARM:stixxxx: Add STiH415 SOC support

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Date:	Mon, 10 Jun 2013 12:46:59 +0100
From:	Srinivas KANDAGATLA <srinivas.kandagatla@...com>
To:	Michal Simek <monstr@...str.eu>
Cc:	linux-arm <linux-arm-kernel@...ts.infradead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arnd Bergmann <arnd@...db.de>,
	"David S. Miller" <davem@...emloft.net>,
	devicetree-discuss <devicetree-discuss@...ts.ozlabs.org>,
	Grant Likely <grant.likely@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	John Stultz <john.stultz@...aro.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Russell King <linux@....linux.org.uk>,
	linux-doc@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	linux-serial@...r.kernel.org, Mark Brown <broonie@...nel.org>,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	Olof Johansson <olof@...om.net>,
	Rob Herring <rob.herring@...xeda.com>,
	Rob Landley <rob@...dley.net>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Stephen Gallimore <stephen.gallimore@...com>,
	Stuart Menefy <stuart.menefy@...com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tony Prisk <linux@...sktech.co.nz>
Subject: Re: [PATCH v2 06/11] ARM:stixxxx: Add STiH415 SOC support

On 10/06/13 12:15, Michal Simek wrote:

Thankyou for your comments,
> Hi,
> 
> hmm - that's a nice bug that thunderbird is not able to send this email. :-(
> Let's comment it again via gmail.
>     diff --git a/arch/arm/boot/dts/stih415.dtsi
>     b/arch/arm/boot/dts/stih415.dtsi
>     new file mode 100644
>     index 0000000..6dcf5b4
>     --- /dev/null
>     +++ b/arch/arm/boot/dts/stih415.dtsi
...
>     +
>     +       soc {
>     +               #address-cells = <1>;
>     +               #size-cells = <1>;
>     +               interrupt-parent = <&intc>;
>     +               ranges;
>     +               compatible      = "simple-bus";
> 
> 
> 
> Rob and Grant: what's the purpose of SoC node.
> It seems to me odd that SoC is compatible with simple-bus.

All the drivers on this SOC are based on platform bus, so we use
simple-bus, here.

>     diff --git a/arch/arm/boot/dts/stih41x.dtsi
>     b/arch/arm/boot/dts/stih41x.dtsi
>     new file mode 100644
>     index 0000000..7321403
>     --- /dev/null
>     +++ b/arch/arm/boot/dts/stih41x.dtsi
>     @@ -0,0 +1,38 @@
>     +/ {
>     +       #address-cells = <1>;
>     +       #size-cells = <1>;
>     +
>     +       cpus {
>     +               #address-cells = <1>;
>     +               #size-cells = <0>;
>     +               cpu@0 {
>     +                       compatible = "arm,cortex-a9";
>     +                       reg = <0>;
>     +               };
>     +               cpu@1 {
>     +                       compatible = "arm,cortex-a9";
>     +                       reg = <1>;
>     +               };
>     +       };
>     +
> 
> 
> I believe your SoC also has a bus here.

It does but there is no active driver to manage it.

>     --- /dev/null
>     +++ b/arch/arm/mach-stixxxx/board-dt.c
>     @@ -0,0 +1,47 @@

>     +
>     +void __init stih41x_l2x0_init(void)
>     +{
>     +       u32 way_size = 0x4;
>     +       u32 aux_ctrl;
>     +
>     +       aux_ctrl = (0x1 << L2X0_AUX_CTRL_SHARE_OVERRIDE_SHIFT) |
>     +               (0x1 << L2X0_AUX_CTRL_DATA_PREFETCH_SHIFT) |
>     +               (0x1 << L2X0_AUX_CTRL_INSTR_PREFETCH_SHIFT) |
>     +               (way_size << L2X0_AUX_CTRL_WAY_SIZE_SHIFT);
> 
> 
> 
> #include <linux/bitops.h>
> Linus Walleij would write use  BIT() here

I will use BIT() macro.

>     diff --git a/arch/arm/mach-stixxxx/headsmp.S
>     b/arch/arm/mach-stixxxx/headsmp.S
>     new file mode 100644
>     index 0000000..3dd5c04
>     --- /dev/null
>     +++ b/arch/arm/mach-stixxxx/headsmp.S
>     @@ -0,0 +1,44 @@
>     +/*
>     + *  arch/arm/plat-stixxxx/headsmp.S
> 

>     +       .long   pen_release
> 
> 
> check that your SoC has no option to start/reset cpus separately.
> If yes, then you shouldn't use pen_release.
> We discussed this with Russel some days ago.
No, stih41x series can't reset the cores separately.
>  
> 
>     diff --git a/arch/arm/mach-stixxxx/platsmp.c
>     b/arch/arm/mach-stixxxx/platsmp.c
>     new file mode 100644
>     index 0000000..ffc40c0
>     --- /dev/null
>     +++ b/arch/arm/mach-stixxxx/platsmp.c
>     @@ -0,0 +1,117 @@
>     +/*
>     + *  arch/arm/plat-stixxxx/platsmp.c
> 
> 
> wrong.

Left over, will clean it up in next version.

>     + *  arch/arm/plat-stixxxx/platsmp.c
> 
> 
> incorrect.
Left over, will clean it up in next version.
>  
>     +extern struct smp_operations   stixxxx_smp_ops;
>     +extern void __iomem *stixxxx_scu_base_addr;
> 
> 
> Unused variable in this patch.
yes, I will remove stixxxx_scu_base_addr.

thanks,
srini


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