linux-kernel - Re: [PATCH 1/3] clk: mux: Add regmap support for simple mux

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Date:	Fri, 29 May 2015 08:57:55 +0200
From:	Joachim Eastwood <manabian@...il.com>
To:	Matthias Brugger <matthias.bgg@...il.com>
Cc:	Mike Turquette <mturquette@...aro.org>,
	Stephen Boyd <sboyd@...eaurora.org>, henryc.chen@...iatek.com,
	s.hauer@...gutronix.de, jamesjj.liao@...iatek.com,
	Philipp Zabel <p.zabel@...gutronix.de>,
	linux-clk@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 1/3] clk: mux: Add regmap support for simple mux

Hi Matthias,

On 28 May 2015 at 20:41, Matthias Brugger <matthias.bgg@...il.com> wrote:
> Some devices like SoCs from Mediatek need to use the clock muxes
> through a regmap interface.
> This patch adds regmap support for simple the simple multiplexer
> clock code.

Nice to see regmap support. This something I would also like to see
added to the clk framework.
And if the approach is agreed upon I would like to see support on
gates and dividers also.

> +static void clk_mux_writel(struct clk_mux *mux, u32 val)
> +{
> +       if (mux->flags && CLK_MUX_USE_REGMAP)

Assume you mean &.

> +               regmap_write(mux->regmap, mux->offset, val);
> +       else
> +               clk_writel(val, mux->reg);
> +}
> +
> +static u32 clk_mux_readl(struct clk_mux *mux)
> +{
> +       u32 val;
> +
> +       if (mux->flags && CLK_MUX_USE_REGMAP)

And here.

> +               regmap_read(mux->regmap, mux->offset, &val);
> +       else
> +               val = clk_readl(mux->reg);
> +
> +       return val;
> +}
> +
[...]
> @@ -409,7 +410,9 @@ void clk_unregister_divider(struct clk *clk);
>  struct clk_mux {
>         struct clk_hw   hw;

>         void __iomem    *reg;
> +       struct regmap   *regmap;

Since it not possible to have both iomem and regmap at the same time.
Could this be put in a union or does that make registration more
difficult?

>         u32             *table;
> +       u32             offset;
>         u32             mask;
>         u8              shift;
>         u8              flags;


regards,
Joachim Eastwood
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