linux-kernel - Re: [PATCH v6 2/6] clk: sunxi-ng: Add sun4i/sun7i CCU driver

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Date:   Wed, 2 Aug 2017 17:05:04 +1000
From:   Jonathan Liu <net147@...il.com>
To:     Priit Laes <plaes@...es.org>
Cc:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Russell King <linux@...linux.org.uk>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        linux-clk@...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>,
        Olliver Schinagl <oliver@...inagl.nl>
Subject: Re: [PATCH v6 2/6] clk: sunxi-ng: Add sun4i/sun7i CCU driver

Hi Priit,

On 15 July 2017 at 00:49, Priit Laes <plaes@...es.org> wrote:
> Introduce a clock controller driver for sun4i A10 and sun7i A20
> series SoCs.
>
> Signed-off-by: Priit Laes <plaes@...es.org>
> ---
>  drivers/clk/sunxi-ng/Kconfig              |   13 +-
>  drivers/clk/sunxi-ng/Makefile             |    1 +-
>  drivers/clk/sunxi-ng/ccu-sun4i-a10.c      | 1454 ++++++++++++++++++++++-
>  drivers/clk/sunxi-ng/ccu-sun4i-a10.h      |   61 +-
>  include/dt-bindings/clock/sun4i-a10-ccu.h |  200 +++-
>  include/dt-bindings/clock/sun7i-a20-ccu.h |   53 +-
>  include/dt-bindings/reset/sun4i-a10-ccu.h |   69 +-
>  7 files changed, 1851 insertions(+)
>  create mode 100644 drivers/clk/sunxi-ng/ccu-sun4i-a10.c
>  create mode 100644 drivers/clk/sunxi-ng/ccu-sun4i-a10.h
>  create mode 100644 include/dt-bindings/clock/sun4i-a10-ccu.h
>  create mode 100644 include/dt-bindings/clock/sun7i-a20-ccu.h
>  create mode 100644 include/dt-bindings/reset/sun4i-a10-ccu.h

<snip>

> diff --git a/drivers/clk/sunxi-ng/ccu-sun4i-a10.c b/drivers/clk/sunxi-ng/ccu-sun4i-a10.c
> new file mode 100644
> index 0000000..09e97d7
> --- /dev/null
> +++ b/drivers/clk/sunxi-ng/ccu-sun4i-a10.c

<snip>

> +static void __init sun4i_ccu_init(struct device_node *node,
> +                                 const struct sunxi_ccu_desc *desc)
> +{
> +       void __iomem *reg;
> +       u32 val;
> +
> +       reg = of_io_request_and_map(node, 0, of_node_full_name(node));
> +       if (IS_ERR(reg)) {
> +               pr_err("%s: Could not map the clock registers\n",
> +                      of_node_full_name(node));
> +               return;
> +       }
> +
> +       /* Force the PLL-Audio-1x divider to 4 */
> +       val = readl(reg + SUN4I_PLL_AUDIO_REG);

> +       val &= ~GENMASK(19, 16);
> +       writel(val | (3 << 16), reg + SUN4I_PLL_AUDIO_REG);

This doesn't work for me on A20 (440 Hz tone outputs at 880 Hz tone)
and I need to use the following instead:
       val &= ~GENMASK(29, 26);
       writel(val | (4 << 26), reg + SUN4I_PLL_AUDIO_REG);

Toggling bits 16-19 doesn't seem to have any effect on the audio for me.

Thanks.

Regards,
Jonathan