linux-kernel - Re: [linux-sunxi] Re: [PATCH 5/6] pwm: sun4i: Add support to output source clock directly

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Date:   Sat, 27 Jul 2019 22:54:32 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Jernej Skrabec <jernej.skrabec@...l.net>
Cc:     Maxime Ripard <mripard@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, linux-pwm@...r.kernel.org,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [linux-sunxi] Re: [PATCH 5/6] pwm: sun4i: Add support to output
 source clock directly

On Sat, Jul 27, 2019 at 10:28 PM Jernej Škrabec <jernej.skrabec@...l.net> wrote:
>
> Dne sobota, 27. julij 2019 ob 12:50:08 CEST je Maxime Ripard napisal(a):
> > On Fri, Jul 26, 2019 at 08:40:44PM +0200, Jernej Skrabec wrote:
> > > PWM core has an option to bypass whole logic and output unchanged source
> > > clock as PWM output. This is achieved by enabling bypass bit.
> > >
> > > Note that when bypass is enabled, no other setting has any meaning, not
> > > even enable bit.
> > >
> > > This mode of operation is needed to achieve high enough frequency to
> > > serve as clock source for AC200 chip, which is integrated into same
> > > package as H6 SoC.
> > >
> > > Signed-off-by: Jernej Skrabec <jernej.skrabec@...l.net>
> >
> > It doesn't seem to be available on the A10 (at least) though. The A13
> > seem to have it, so you should probably check that, and make that
> > conditional to the compatible if not available on all of them.
>
> Ok, can you suggest the name for the quirk? "has_bypass" is suspiciously
> similar to "has_prescaler_bypass".

has_direct_mod_clk_output?

> Also, how to name these sun4i_pwm_data structures? Now that there are (will
> be) three new quirks, name of the structure would be just too long, like
> "sun50i_pwm_dual_prescaler_bypass_clk_rst_bypass".

Just use the SoC model. Any later ones that have the same quirks will likely
use the same compatible string anyway.

ChenYu