clk: max77686: Register OF clock provider

If max77686 chip is instantiated from device tree, it is desirable to
have an OF clock provider to allow device tree based look-up of clocks.
This patch adds OF clock provider registration to the clk-max77686
driver.

Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
This commit is contained in:
Tomasz Figa 2013-12-12 17:07:20 +01:00 committed by Mike Turquette
parent 3966c947f4
commit b06c698716
3 changed files with 65 additions and 0 deletions

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@ -0,0 +1,38 @@
Binding for Maxim MAX77686 32k clock generator block
This is a part of device tree bindings of MAX77686 multi-function device.
More information can be found in bindings/mfd/max77686.txt file.
The MAX77686 contains three 32.768khz clock outputs that can be controlled
(gated/ungated) over I2C.
Following properties should be presend in main device node of the MFD chip.
Required properties:
- #clock-cells: simple one-cell clock specifier format is used, where the
only cell is used as an index of the clock inside the provider. Following
indices are allowed:
- 0: 32khz_ap clock,
- 1: 32khz_cp clock,
- 2: 32khz_pmic clock.
Example: Node of the MFD chip
max77686: max77686@09 {
compatible = "maxim,max77686";
interrupt-parent = <&wakeup_eint>;
interrupts = <26 0>;
reg = <0x09>;
#clock-cells = <1>;
/* ... */
};
Example: Clock consumer node
foo@0 {
compatible = "bar,foo";
/* ... */
clock-names = "my-clock";
clocks = <&max77686 2>;
};

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@ -7,6 +7,9 @@ different i2c slave address,presently for which we are statically creating i2c
client while probing.This document describes the binding for mfd device and
PMIC submodule.
Binding for the built-in 32k clock generator block is defined separately
in bindings/clk/maxim,max77686.txt file.
Required properties:
- compatible : Must be "maxim,max77686";
- reg : Specifies the i2c slave address of PMIC block.

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@ -169,6 +169,26 @@ static int max77686_clk_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, clocks);
if (iodev->dev->of_node) {
struct clk_onecell_data *of_data;
of_data = devm_kzalloc(&pdev->dev,
sizeof(*of_data), GFP_KERNEL);
if (!of_data) {
ret = -ENOMEM;
goto err_clocks;
}
of_data->clks = clocks;
of_data->clk_num = MAX77686_CLKS_NUM;
ret = of_clk_add_provider(iodev->dev->of_node,
of_clk_src_onecell_get, of_data);
if (ret) {
dev_err(&pdev->dev, "failed to register OF clock provider\n");
goto err_clocks;
}
}
return 0;
err_clocks:
@ -182,9 +202,13 @@ err_clocks:
static int max77686_clk_remove(struct platform_device *pdev)
{
struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
struct clk **clocks = platform_get_drvdata(pdev);
int i;
if (iodev->dev->of_node)
of_clk_del_provider(iodev->dev->of_node);
for (i = 0; i < MAX77686_CLKS_NUM; i++) {
struct clk_hw *hw = __clk_get_hw(clocks[i]);
struct max77686_clk *max77686 = to_max77686_clk(hw);