linux-kernel - Re: [linux-sunxi] [PATCH 1/7] pinctrl: sunxi: add support for pin controllers without bus gate

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Message-ID: <20180112085134.dcsikciujsxuuwhx@flea.lan>
Date:   Fri, 12 Jan 2018 09:51:34 +0100
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Icenowy Zheng <icenowy@...c.io>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Andre Przywara <andre.przywara@....com>,
        Rob Herring <robh+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-gpio@...r.kernel.org, linux-sunxi@...glegroups.com,
        linux-clk@...r.kernel.org
Subject: Re: [linux-sunxi] [PATCH 1/7] pinctrl: sunxi: add support for pin
 controllers without bus gate

1;5002;0c
On Thu, Jan 11, 2018 at 09:21:06PM +0800, Icenowy Zheng wrote:
> 
> 
> 于 2018年1月11日 GMT+08:00 下午7:48:40, Andre Przywara <andre.przywara@....com> 写到:
> >Hi,
> >
> >another take to avoid this patch at all, I just remembered this from an
> >IRC discussion before:
> >
> >On 06/01/18 04:23, Icenowy Zheng wrote:
> >> The Allwinner H6 pin controllers (both the main one and the CPUs one)
> >> have no bus gate clocks.
> >
> >I don't think this is true. The pin controller *needs* an APB clock,
> >it's just not gate-able or not exposed or documented.
> >The "system bus tree" on page 90 in the manual shows that the "GPIO"
> >block is located on the APB1 bus.
> >So can't we just reference this apb clock directly? That would be much
> >cleaner, "more" correct and require less changes: "The best patch is no
> >patch":
> 
> I can accept this. (In fact I have considered this, but
> I don't dare to directly use bus clock in a device, as it's not
> exported before.
> 
> Maxime, Chen-Yu, can you agree the following code?

Yes, that works for me.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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