Re: [PATCH v2 1/4] ARM: dts: dra7: Add dt node for the sycon pcie

From: Tony Lindgren <tony@atomide.com>
To: Kishon Vijay Abraham I <kishon@ti.com>
Cc: linux-kernel@vger.kernel.org, bcousson@baylibre.com,
	linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	devicetree@vger.kernel.org, robh+dt@kernel.org,
	pawel.moll@arm.com, mark.rutland@arm.com,
	ijc+devicetree@hellion.org.uk, galak@codeaurora.org,
	nsekhar@ti.com, linux@arm.linux.org.uk
Subject: Re: [PATCH v2 1/4] ARM: dts: dra7: Add dt node for the sycon pcie
Date: Mon, 12 Oct 2015 15:23:01 -0700	[thread overview]
Message-ID: <20151012222301.GI23801@atomide.com> (raw)
In-Reply-To: <561C31B7.3060604@ti.com>

* Kishon Vijay Abraham I <kishon@ti.com> [151012 15:23]:
> Hi,
> 
> On Tuesday 13 October 2015 03:42 AM, Tony Lindgren wrote:
> > * Kishon Vijay Abraham I <kishon@ti.com> [151012 15:09]:
> >> Hi,
> >>
> >> On Tuesday 13 October 2015 03:33 AM, Tony Lindgren wrote:
> >>> * Kishon Vijay Abraham I <kishon@ti.com> [151012 14:50]:
> >>>> Hi Tony,
> >>>>
> >>>> On Tuesday 13 October 2015 02:51 AM, Tony Lindgren wrote:
> >>>>> * Kishon Vijay Abraham I <kishon@ti.com> [150915 06:37]:
> >>>>>> Add new device tree node for the control module register space where
> >>>>>> PCIe registers are present.
> >>>>>>
> >>>>>> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
> >>>>>> ---
> >>>>>>  arch/arm/boot/dts/dra7.dtsi |    5 +++++
> >>>>>>  1 file changed, 5 insertions(+)
> >>>>>>
> >>>>>> diff --git a/arch/arm/boot/dts/dra7.dtsi b/arch/arm/boot/dts/dra7.dtsi
> >>>>>> index 5d65db9..0769b5d 100644
> >>>>>> --- a/arch/arm/boot/dts/dra7.dtsi
> >>>>>> +++ b/arch/arm/boot/dts/dra7.dtsi
> >>>>>> @@ -154,6 +154,11 @@
> >>>>>>  					compatible = "syscon";
> >>>>>>  					reg = <0x1c04 0x0020>;
> >>>>>>  				};
> >>>>>> +
> >>>>>> +				scm_conf_pcie: tisyscon@1c24 {
> >>>>>> +					compatible = "syscon";
> >>>>>> +					reg = <0x1c24 0x0024>;
> >>>>>> +				};
> >>>>>>  			};
> >>>>>>  
> >>>>>>  			cm_core_aon: cm_core_aon@5000 {
> >>>>>
> >>>>>
> >>>>> Why don't you just extend the existing scm_conf1 area? This is not all pcie
> >>>>> specific for scm_conf_pcie, at least for PLLEN_CONTROL, RMII_CLK_SETTING
> >>>>> and MUXSEL_32K_CLKIN.
> >>>>
> >>>> scm_conf_pcie has only PCIe registers (it starts at 0x4A003C24).
> >>>> PLLEN_CONTROL and others are at 0x4A003C14 as per
> >>>> DRA75x_DRA74x_SR1.1_NDA_TRM_vW.
> >>>
> >>> Oh sorry I guess I was looking at a wrong address then.
> >>>
> >>>> Since PCIe itself has a bunch of registers for itself, thought of
> >>>> creating a separate dt node. But I can extend scm_conf1 area.
> >>>
> >>> Why not just ioremap them then? Do these need to be shared with
> >>> some other driver?
> >>
> >> yeah, some are used by PCIe controller driver and some are used by PCIe
> >> PHY driver.
> > 
> > OK makes sense to me then.
> 
> Cool.
> 
> Btw the driver modifications has not yet been merged, so don't merge
> these yet. I'll repost these once the driver is merged.

OK thanks.

Tony