linux-kernel - Re: [PATCH 2/4] clk: clk: Add clk_dflt

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Date:   Tue, 19 Jun 2018 09:06:16 +0300
From:   Tero Kristo <t-kristo@...com>
To:     Keerthy <j-keerthy@...com>, <sboyd@...nel.org>, <tony@...mide.com>
CC:     <linux-omap@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <mturquette@...libre.com>,
        <d-gerlach@...com>
Subject: Re: [PATCH 2/4] clk: clk: Add clk_dflt_restore

On 19/06/18 07:28, Keerthy wrote:
> The default restore context function enables or disables
> the clock based on the enable_count. This is done in cases
> where the clock context is lost and based on the enable_count
> the clock either needs to be enabled/disabled. This particularly
> helps restore the state of gate clocks.
> 
> Signed-off-by: Keerthy <j-keerthy@...com>
> ---
>   drivers/clk/clk.c            | 19 +++++++++++++++++++
>   include/linux/clk-provider.h |  2 ++
>   2 files changed, 21 insertions(+)
> 
> diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
> index 7347e06..c201b8b 100644
> --- a/drivers/clk/clk.c
> +++ b/drivers/clk/clk.c
> @@ -910,6 +910,25 @@ static int clk_core_enable_lock(struct clk_core *core)
>   	return ret;
>   }
>   
> +/**
> + * clk_dflt_restore_context - restore context for poweroff
> + * @hw: the clk_hw pointer of clock whose state is to be restored
> + *
> + * The default restore context function enables or disables
> + * the clock based on the enable_count. This is done in cases
> + * where the clock context is lost and based on the enable_count
> + * the clock either needs to be enabled/disabled. This particularly
> + * helps restore the state of gate clocks.
> + */
> +void clk_dflt_restore_context(struct clk_hw *hw)

I think the name of this function is wrong, it should be 
clk_gate_restore_context, as only gate clocks are ever going to be using 
this afaics.

-Tero

> +{
> +	if (hw->clk->core->enable_count)
> +		hw->clk->core->ops->enable(hw);
> +	else
> +		hw->clk->core->ops->disable(hw);
> +}
> +EXPORT_SYMBOL_GPL(clk_dflt_restore_context);
> +
>   static int _clk_save_context(struct clk_core *clk)
>   {
>   	struct clk_core *child;
> diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
> index 7f30d62..3e0c61a 100644
> --- a/include/linux/clk-provider.h
> +++ b/include/linux/clk-provider.h
> @@ -992,5 +992,7 @@ static inline void clk_writel(u32 val, u32 __iomem *reg)
>   
>   #endif	/* platform dependent I/O accessors */
>   
> +void clk_dflt_restore_context(struct clk_hw *hw);
> +
>   #endif /* CONFIG_COMMON_CLK */
>   #endif /* CLK_PROVIDER_H */
> 

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