linux-kernel - Re: [PATCH v5 00/10] ASPEED sgpio driver enhancement.

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Date:   Thu, 10 Jun 2021 10:24:19 +0800
From:   Steven Lee <steven_lee@...eedtech.com>
To:     Linus Walleij <linus.walleij@...aro.org>
CC:     Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:ARM/ASPEED MACHINE SUPPORT" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/ASPEED MACHINE SUPPORT" 
        <linux-aspeed@...ts.ozlabs.org>,
        open list <linux-kernel@...r.kernel.org>,
        Hongwei Zhang <Hongweiz@....com>,
        Ryan Chen <ryan_chen@...eedtech.com>,
        Billy Tsai <billy_tsai@...eedtech.com>
Subject: Re: [PATCH v5 00/10] ASPEED sgpio driver enhancement.

The 06/09/2021 18:54, Linus Walleij wrote:
> On Tue, Jun 8, 2021 at 12:26 PM Steven Lee <steven_lee@...eedtech.com> wrote:
> 
> > AST2600 SoC has 2 SGPIO master interfaces one with 128 pins another one
> > with 80 pins, AST2500/AST2400 SoC has 1 SGPIO master interface that
> > supports up to 80 pins.
> > In the current driver design, the max number of sgpio pins is hardcoded
> > in macro MAX_NR_HW_SGPIO and the value is 80.
> >
> > For supporting sgpio master interfaces of AST2600 SoC, the patch series
> > contains the following enhancement:
> > - Convert txt dt-bindings to yaml.
> > - Update aspeed-g6 dtsi to support the enhanced sgpio.
> > - Define max number of gpio pins in ast2600 platform data. Old chip
> >   uses the original hardcoded value.
> > - Support muiltiple SGPIO master interfaces.
> > - Support up to 128 pins.
> > - Support wdt reset tolerance.
> > - Fix irq_chip issues which causes multiple sgpio devices use the same
> >   irq_chip data.
> > - Replace all of_*() APIs with device_*().
> >
> > Changes from v4:
> 
> v5 looks good to me!
> 
> I just need Rob's or another DT persons nod on the bindings (or timeout)
> before I merge it. Poke me if nothing happens.
> 
> >   ARM: dts: aspeed-g6: Add SGPIO node.
> >   ARM: dts: aspeed-g5: Remove ngpios from sgpio node.
> 
> These two need to be merged through the SoC tree, the rest I will handle.
> 
Hi Linus, Andrew,

Per the comment in the following mail
https://lkml.org/lkml/2021/6/9/317

I was wondering if I should prepare v6 for the currnet solution or
I should drop this patch series then prepare another patch for the
new solution(piar GPIO input/output) which breaks userspace but is
better than the current solution.

Thanks,
Steven

> Yours,
> Linus Walleij