linux-kernel - Re: [linux-sunxi] [PATCH v4 2/6] clk: sunxi: Add H3 clocks support

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 4 Nov 2015 08:23:04 -0800
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Julian Calaby <julian.calaby@...il.com>
Cc:	Jens Kuske <jenskuske@...il.com>, Chen-Yu Tsai <wens@...e.org>,
	Michael Turquette <mturquette@...libre.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Emilio López <emilio@...pez.com.ar>,
	Vishnu Patekar <vishnupatekar0510@...il.com>,
	Hans de Goede <hdegoede@...hat.com>,
	devicetree <devicetree@...r.kernel.org>,
	"Mailing List, Arm" <linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [linux-sunxi] [PATCH v4 2/6] clk: sunxi: Add H3 clocks support

Hi Julian,

On Wed, Oct 28, 2015 at 10:12:09AM +1100, Julian Calaby wrote:
> > +       of_property_for_each_u32(node, "clock-indices", prop, p, index) {
> > +               of_property_read_string_index(node, "clock-output-names",
> > +                                             i, &clk_name);
> > +
> > +               if (index == 17 || (index >= 29 && index <= 31))
> > +                       clk_parent = AHB2;
> > +               else if (index <= 63 || index >= 128)
> > +                       clk_parent = AHB1;
> > +               else if (index >= 64 && index <= 95)
> > +                       clk_parent = APB1;
> > +               else if (index >= 96 && index <= 127)
> > +                       clk_parent = APB2;
> 
> A way to make this reusable in the future might be to encode it in a
> structure like:
> 
> static const struct bus_clock_paths sun8i_h3_bus_clock_paths __initdata = {
>         {.parent = 2, .min = 17, .max = 17}, /* index 17 is from AHB2 */
>         {.parent = 2, .min = 29, .max = 31}, /* AHB2 bank */
>         {.parent = 1, .min = 63, .max = 128}, /* AHB1 bank */
> ...
>         {}
> };
> 
> Then the code here can be reused for other clocks like this in the
> future without too much bloat. (And this would potentially could be
> generic enough for other platforms.)

We don't really need that at the moment. There's not point in writing
more complicated code to support a use case we don't have yet.

(However, something along these lines will definitely be needed if we
ever have another SoC having the same bus gates madness)

Maxime

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

Download attachment "signature.asc" of type "application/pgp-signature" (820 bytes)