linux-kernel - Re: [RFC 1/2] clk: Allow overriding generic ops for clocks

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Date:	Mon, 24 Nov 2014 17:34:50 -0800
From:	Mike Turquette <mturquette@...aro.org>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	"Sylwester Nawrocki" <s.nawrocki@...sung.com>,
	"Tomasz Figa" <tomasz.figa@...il.com>,
	"Kukjin Kim" <kgene@...nel.org>, linux-kernel@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	"Javier Martinez Canillas" <javier.martinez@...labora.co.uk>,
	"Vivek Gautam" <gautam.vivek@...sung.com>,
	"Kevin Hilman" <khilman@...nel.org>
Cc:	"Krzysztof Kozlowski" <k.kozlowski@...sung.com>
Subject: Re: [RFC 1/2] clk: Allow overriding generic ops for clocks

Quoting Krzysztof Kozlowski (2014-11-24 07:18:31)
> For clocks depending on some other clock domain one may want to perform
> specific ops before actual enable/disable of gate clock. Allow such case
> by accepting supplied ops in new exported function:
> clk_register_gate_ops().

If you are not going to use the gate_ops, why use the gate clock at all?
You can create a platform-specific clock type which uses the ops you
specify.

Regards,
Mike

> 
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
> ---
>  drivers/clk/clk-gate.c       | 16 +++++++++++++---
>  include/linux/clk-provider.h |  5 +++++
>  2 files changed, 18 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/clk/clk-gate.c b/drivers/clk/clk-gate.c
> index 51fd87fb7ba6..51802af2d9e7 100644
> --- a/drivers/clk/clk-gate.c
> +++ b/drivers/clk/clk-gate.c
> @@ -117,11 +117,12 @@ EXPORT_SYMBOL_GPL(clk_gate_ops);
>   * @bit_idx: which bit in the register controls gating of this clock
>   * @clk_gate_flags: gate-specific flags for this clock
>   * @lock: shared register lock for this clock
> + * @ops: clk_ops to use for this clock
>   */
> -struct clk *clk_register_gate(struct device *dev, const char *name,
> +struct clk *clk_register_gate_ops(struct device *dev, const char *name,
>                 const char *parent_name, unsigned long flags,
>                 void __iomem *reg, u8 bit_idx,
> -               u8 clk_gate_flags, spinlock_t *lock)
> +               u8 clk_gate_flags, spinlock_t *lock, const struct clk_ops *ops)
>  {
>         struct clk_gate *gate;
>         struct clk *clk;
> @@ -142,7 +143,7 @@ struct clk *clk_register_gate(struct device *dev, const char *name,
>         }
>  
>         init.name = name;
> -       init.ops = &clk_gate_ops;
> +       init.ops = ops;
>         init.flags = flags | CLK_IS_BASIC;
>         init.parent_names = (parent_name ? &parent_name: NULL);
>         init.num_parents = (parent_name ? 1 : 0);
> @@ -161,4 +162,13 @@ struct clk *clk_register_gate(struct device *dev, const char *name,
>  
>         return clk;
>  }
> +EXPORT_SYMBOL_GPL(clk_register_gate_ops);
> +
> +struct clk *clk_register_gate(struct device *dev, const char *name,
> +               const char *parent_name, unsigned long flags,
> +               void __iomem *reg, u8 bit_idx,
> +               u8 clk_gate_flags, spinlock_t *lock)
> +{
> +       return clk_register_gate_ops(dev, name, parent_name, flags, reg, bit_idx, clk_gate_flags, lock, &clk_gate_ops);
> +}
>  EXPORT_SYMBOL_GPL(clk_register_gate);
> diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
> index be21af149f11..6cfc77a9f339 100644
> --- a/include/linux/clk-provider.h
> +++ b/include/linux/clk-provider.h
> @@ -290,11 +290,16 @@ struct clk_gate {
>  #define CLK_GATE_HIWORD_MASK           BIT(1)
>  
>  extern const struct clk_ops clk_gate_ops;
> +struct clk *clk_register_gate_ops(struct device *dev, const char *name,
> +               const char *parent_name, unsigned long flags,
> +               void __iomem *reg, u8 bit_idx,
> +               u8 clk_gate_flags, spinlock_t *lock, const struct clk_ops *ops);
>  struct clk *clk_register_gate(struct device *dev, const char *name,
>                 const char *parent_name, unsigned long flags,
>                 void __iomem *reg, u8 bit_idx,
>                 u8 clk_gate_flags, spinlock_t *lock);
>  
> +
>  struct clk_div_table {
>         unsigned int    val;
>         unsigned int    div;
> -- 
> 1.9.1
> 
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