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'.
+}