linux-kernel - Re: [PATCH v3 2/4] pinctrl: mvebu: pinctrl driver for 98DX2530 SoC

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Date:   Wed, 6 Apr 2022 21:51:05 +0000
From:   Chris Packham <Chris.Packham@...iedtelesis.co.nz>
To:     Andrew Lunn <andrew@...n.ch>
CC:     "linus.walleij@...aro.org" <linus.walleij@...aro.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "will@...nel.org" <will@...nel.org>,
        "gregory.clement@...tlin.com" <gregory.clement@...tlin.com>,
        "sebastian.hesselbarth@...il.com" <sebastian.hesselbarth@...il.com>,
        "kostap@...vell.com" <kostap@...vell.com>,
        "robert.marko@...tura.hr" <robert.marko@...tura.hr>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 2/4] pinctrl: mvebu: pinctrl driver for 98DX2530 SoC

Hi Andrew,

On 7/04/22 00:36, Andrew Lunn wrote:
> On Wed, Apr 06, 2022 at 03:21:56PM +1200, Chris Packham wrote:
>> This pinctrl driver supports the 98DX25xx and 98DX35xx family of chips
>> from Marvell. It is based on the Marvell SDK with additions for various
>> (non-gpio) pin configurations based on the datasheet.
>>
>> Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
>> Reviewed-by: Andrew Lunn <andrew@...n.ch>
>> ---
>>
>> Notes:
>>      Changes in v3:
>>      - Use mmio instead of syscon
> Hi Chris
>
> syscon is used when the register space is shared with other
> devices. Is that not the case here? You can share mmio spaces, but you
> have to use the correct call to reserve it, so that the system knows
> it is to be shared. Or are all the pinctl registers contiguous and you
> are only reserve just the registers you need, leaving other drivers
> fee to take what they need?
>
> I'm just trying to ensure you are not going to have trouble later when
> you add other drivers.

The pinctrl registers that are used are all continguous (0x80020100 -- 
0x8002011c) . There is a block called the "CnM RFU" which is near the 
pinctrl registers (but a different section in the datasheet) which has 
some peripheral controls. There is also some odd registers (eMMC PHY and 
RFU interrupts) in the MPP section of the document but outside the range 
that this driver uses. I can't tell if this is similar to the RFU block 
on the discrete Armada 64 SoCs, the integrated SoC/Switch chips tend to 
be a bit of a frankenstiens monster of IP blocks.

I really wish I could just share the datasheet but you know how hardware 
vendors like their NDAs.

>
>      Andrew