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SubjectRe: [PATCH v3 4/5] clk: basic gateable and fixed-rate clks
On Mon, Nov 21, 2011 at 05:40:46PM -0800, Mike Turquette wrote:
> Many platforms support simple gateable clks and fixed-rate clks that
> should not be re-implemented by every platform.
>
> This patch introduces a gateable clk with a common programming model of
> gate control via a write of 1 bit to a register. Both set-to-enable and
> clear-to-enable are supported.
>
> Also introduced is a fixed-rate clk which has no reprogrammable aspects.
>
> The purpose of both types of clks is documented in drivers/clk/basic.c.
>
What I have seen is drivers/clk/clk-basic.c.

> TODO: add support for a simple divider, simple mux and a dummy clk for
> stubbing out platform support.
>
> Based on original patch by Jeremy Kerr contribution by Jamie Iles.
>
> Signed-off-by: Mike Turquette <mturquette@linaro.org>
> ---
> drivers/clk/Kconfig | 7 ++
> drivers/clk/Makefile | 5 +-
> drivers/clk/clk-basic.c | 208 +++++++++++++++++++++++++++++++++++++++++++++++
> include/linux/clk.h | 35 ++++++++
> 4 files changed, 253 insertions(+), 2 deletions(-)
> create mode 100644 drivers/clk/clk-basic.c

[...]

> +int clk_register_gate(struct device *dev, const char *name, unsigned long flags,
> + struct clk *fixed_parent, void __iomem *reg, u8 bit_idx,
> + int set_to_enable)
> +{
> + struct clk_hw_gate *gclk;
> + struct clk *clk;
> +
> + gclk = kmalloc(sizeof(struct clk_hw_gate), GFP_KERNEL);
> +
> + if (!gclk) {
> + pr_err("%s: could not allocate gated clk\n", __func__);
> + return -ENOMEM;
> + }
> +
> + clk = &gclk->clk;
> +
> + /* struct clk_hw_gate assignments */
> + gclk->fixed_parent = fixed_parent;
> + gclk->reg = reg;
> + gclk->bit_idx = bit_idx;
> +
> + /* struct clk assignments */
> + clk->name = name;
> + clk->flags = flags;
> +
> + if (set_to_enable)
> + clk->ops = &clk_hw_gate_set_enable_ops;
> + else
> + clk->ops = &clk_hw_gate_set_disable_ops;
> +
> + clk_init(NULL, clk);
> +
> + return 0;

The device tree support needs to get this 'struct clk *', so we may
want to have all these registering functions return the 'clk'.

> +}

--
Regards,
Shawn



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