linux-kernel - Re: [PATCH v2 00/10] clk: sunxi-ng: Add support for A80 CCUs

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Date:   Mon, 30 Jan 2017 08:42:10 +0100
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com
Subject: Re: [PATCH v2 00/10] clk: sunxi-ng: Add support for A80 CCUs

Hi,

On Sat, Jan 28, 2017 at 08:22:29PM +0800, Chen-Yu Tsai wrote:
> Hi everyone,
> 
> This is v2 of my A80 CCU clk patches. Changes since v1:
> 
>   - Use pre-divider adjusted parent rate for rounding.
> 
>   - Use else statement for the case where the PLL lock status bit is
>     in same register.
> 
>   - Add a more detailed description of the main CCU and DE CCU to the
>     commit messages.
> 
>   - Fix DE CCU compatible string in DT binding example.
> 
>   - Fix incorrectly squashed patch hunk.
> 
>   - Drop leading zeros from device tree node name in DT examples.
> 
>   - Expanded commit message for "ARM: dts: sun8i-a23-q8-tablet: Drop
>     pinmux setting for codec PA gpio".
> 
> This series adds new "sunxi-ng" style drivers for the CCUs found in the
> Allwinner A80 SoC. The A80 contains 1 main clock control unit, and some
> subsystem specific clock control units at separate addresses. These
> include the USB, display engine, and MMC.
> 
>   - The MMC clocks can be supported by the old clock drivers,
>     hence here we do not add a new driver for it.
> 
>   - The old USB clock driver is intertwined with other SoCs,
>     requires old style bindings with clock-output-names and
>     CLK_OF_DECLARE for its parents. It is easier to switch
>     to a new binding and driver.
> 
>   - The display engine (DE) CCU was not supported in the past.
> 
> The A80 CCU also has some quirks about its design. It has
> 
>   - Separate registers for PLL lock status
> 
>   - P1, P2 dividers, which are power-of-2 and only 1 bit wide
> 
> The first 3 patches fix and extend the behavior of sunxi-ng's
> mux clock type, based on the behavior of the clk subsystem's
> basic mux clock.
> 
> The fourth patch adds support for checking PLL lock status
> bits in separate registers, as opposed to within the PLL's
> config register.
> 
> Patches 5 through 7 add drivers for the CCU blocks.
>
> Patch 8 and 9 do some cleanup of the sunxi/allwinner dts files
> prior to switching sun9i dts to the new sunxi-ng clock bindings.
> These are independent of the clk stuff, but touch the same lines
> for sun9i. Including them should make it easier to apply and test
> patches.
> 
> Patch 10 has sun9i switch over to the new clock bindings.
> 
> Please take a look and let me know what you think.


This is a bit late, but I took it in anyway.

Note that I only applied the patches about the CCU. The pinctrl header
stuff is quite conflict heavy, and not really a big deal anyway.

(and I really would have liked to have it as a separate series. This
has nothing to do with the A80 CCU).

Thanks,
Maxime

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

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