linux-kernel - Re: [RFC/RFT v3 04/14] clk: meson: eeclk: add setup callback

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Date:   Wed, 03 Jul 2019 16:17:10 +0200
From:   Jerome Brunet <jbrunet@...libre.com>
To:     Neil Armstrong <narmstrong@...libre.com>, khilman@...libre.com
Cc:     linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, martin.blumenstingl@...glemail.com,
        linux-gpio@...r.kernel.org,
        Neil Armstrong <narmstrong@...libre.com>
Subject: Re: [RFC/RFT v3 04/14] clk: meson: eeclk: add setup callback

On Mon 01 Jul 2019 at 11:12, Neil Armstrong <narmstrong@...libre.com> wrote:

> Add a setup() callback in the eeclk structure, to call an optional
> call() function at end of eeclk probe to setup clocks.
>
> It's used for the G12A clock controller to setup the CPU clock
> notifiers.

I'd prefer if you implement the probe function in the related controller
have this probe function call meson_eeclkc_probe() for the common part

In your case, I suppose it means implementing the g12a controller probe
to deal with the notifiers

>
> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
> ---
>  drivers/clk/meson/meson-eeclk.c | 6 ++++++
>  drivers/clk/meson/meson-eeclk.h | 1 +
>  2 files changed, 7 insertions(+)
>
> diff --git a/drivers/clk/meson/meson-eeclk.c b/drivers/clk/meson/meson-eeclk.c
> index 6ba2094be257..81fd2abcd173 100644
> --- a/drivers/clk/meson/meson-eeclk.c
> +++ b/drivers/clk/meson/meson-eeclk.c
> @@ -61,6 +61,12 @@ int meson_eeclkc_probe(struct platform_device *pdev)
>  		}
>  	}
>  
> +	if (data->setup) {
> +		ret = data->setup(pdev);
> +		if (ret)
> +			return ret;
> +	}
> +
>  	return devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get,
>  					   data->hw_onecell_data);
>  }
> diff --git a/drivers/clk/meson/meson-eeclk.h b/drivers/clk/meson/meson-eeclk.h
> index 9ab5d6fa7ccb..7fdf424f71a6 100644
> --- a/drivers/clk/meson/meson-eeclk.h
> +++ b/drivers/clk/meson/meson-eeclk.h
> @@ -20,6 +20,7 @@ struct meson_eeclkc_data {
>  	const struct reg_sequence	*init_regs;
>  	unsigned int			init_count;
>  	struct clk_hw_onecell_data	*hw_onecell_data;
> +	int				(*setup)(struct platform_device *pdev);
>  };
>  
>  int meson_eeclkc_probe(struct platform_device *pdev);
> -- 
> 2.21.0