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Message-ID: <56301B00.1020301@broadcom.com> Date: Tue, 27 Oct 2015 17:46:56 -0700 From: Ray Jui <rjui@...adcom.com> To: Brian Norris <computersforpeace@...il.com> CC: Anup Patel <anup.patel@...adcom.com>, David Woodhouse <dwmw2@...radead.org>, Linux MTD <linux-mtd@...ts.infradead.org>, Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>, Mark Rutland <mark.rutland@....com>, Catalin Marinas <catalin.marinas@....com>, "Will Deacon" <will.deacon@....com>, Sudeep Holla <sudeep.holla@....com>, "Ian Campbell" <ijc+devicetree@...lion.org.uk>, Kumar Gala <galak@...eaurora.org>, Scott Branden <sbranden@...adcom.com>, Florian Fainelli <f.fainelli@...il.com>, Pramod KUMAR <pramodku@...adcom.com>, Vikram Prakash <vikramp@...adcom.com>, Sandeep Tripathy <tripathy@...adcom.com>, "Linux ARM Kernel" <linux-arm-kernel@...ts.infradead.org>, Device Tree <devicetree@...r.kernel.org>, Linux Kernel <linux-kernel@...r.kernel.org>, BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com> Subject: Re: [PATCH v3 2/2] arm64: dts: Add BRCM IPROC NAND DT node for NS2 On 10/27/2015 5:39 PM, Brian Norris wrote: > On Tue, Oct 27, 2015 at 05:25:32PM -0700, Ray Jui wrote: >> On 10/27/2015 5:19 PM, Brian Norris wrote: >>> On Fri, Oct 23, 2015 at 10:46:13AM +0530, Anup Patel wrote: >>>> diff --git a/arch/arm64/boot/dts/broadcom/ns2.dtsi b/arch/arm64/boot/dts/broadcom/ns2.dtsi >>>> index f603277..9610822 100644 >>>> --- a/arch/arm64/boot/dts/broadcom/ns2.dtsi >>>> +++ b/arch/arm64/boot/dts/broadcom/ns2.dtsi >>>> @@ -212,5 +212,19 @@ >>>> compatible = "brcm,iproc-rng200"; >>>> reg = <0x66220000 0x28>; >>>> }; >>>> + >>>> + nand: nand@...60000 { >>>> + compatible = "brcm,nand-iproc", "brcm,brcmnand-v6.1"; >>> >>> Technically, the binding says you should also have "brcm,brcmnand" as a >>> last resort. Otherwise (for the NAND parts): >>> >> >> I believe Anup was seeing issues when both "brcm,nand-iproc" and >> "brcm,brcmnand" are present. >> >> Note "brcm,nand-iproc" invokes 'iproc_nand_probe', which calls >> 'brcmnand_probe' in the end. >> >> "brcm,brcmnand" invokes 'brcmstb_nand_probe', which also calls >> 'brcmstb_probe', but without all the prep configuration required for >> "brcm,nand-iproc". > > Ah, I forgot about that problem. That seems like an OF infrastructure > issue that could be fixed. We could lump these drivers back together, > and make sure that "brcm,nand-iproc" gets the priority in the > of_device_id list. > > Or we could just relax the DT binding. > > But wait, wouldn't cygnus already have that problem? You're using the > binding I suggested in arch/arm/boot/dts/bcm-cygnus.dtsi. Interestingly, we do not see this problem with Cygnus or NSP, but only on NS2 (arm64 based). There may be a difference between how OF devices are instantiated between arm and arm64? > > Oh, and I see we hacked this one in drivers/mtd/nand/brcmnand/Makefile: > > # link order matters; don't link the more generic brcmstb_nand.o before the > # more specific iproc_nand.o, for instance Yes, I see that too (after sending out my previous email, :)). Maybe Anup can help to elaborate on the problem. I'm now getting a bit confused on how the problem can surface on NS2. But in general, I think it's a good idea to relax the requirement in the DT binding document to not require "brcm,brcmnand", in the case when "brcm,nand-iproc" and "brcm,nand-bcm63138" are present. > > Brian > Thanks, Ray -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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