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Commit 525b8956 authored by Taniya Das's avatar Taniya Das Committed by Kyle Yan
Browse files

clk: qcom: Add support for dummy reset controller 



The consumers of the dummy clock provider would require support
for dummy resets, which would make a dummy assert/deassert of
the reset signals. The dummy reset controller supports registering
0-100 separate reset signals.

The consumers node would have the reset phandle and reset specific
pairs along with the reset signal names.

test_node {
	....
	resets = <&clock_gcc GCC_PHY_BCR>;
	reset-names = "phy_reset";
};

CRs-Fixed: 1050517
Change-Id: I242d2f36a6b4af53c658dbaa7a0f32e46cd3af33
Signed-off-by: default avatarTaniya Das <tdas@codeaurora.org>
Signed-off-by: default avatarDeepak Katragadda <dkatraga@codeaurora.org>
parent cc90ead2

Documentation/devicetree/bindings/clock/qcom,dummycc.txt

+5 −1
Original line number Diff line number Diff line
@@ -6,16 +6,20 @@ return a dummy clock that has no effect on hardware. 


Required properties:

- compatible:		Must be "qcom,dummycc"

- #clock_cells:		Must be <1>. This will allow the common clock device

- #clock-cells:		Must be <1>. This will allow the common clock device

			tree framework to recognize _this_ device node as a

			clock provider.



Optional properties:

- clock-output-names:	Name of the clock or the clock type.

- #reset-cells:		Must be <1>. This will allow the common reset device

			tree framework to recognize _this_ device node as a

			reset controller provider.



Example:

	clock_gcc: qcom,gcc {

		compatible = "qcom,dummycc";

		clock-output-names = "gcc_clocks";

		#clock-cells = <1>;

		#reset-cells = <1>;

	};

drivers/clk/qcom/clk-dummy.c

+48 −6
Original line number Diff line number Diff line
@@ -15,14 +15,18 @@ 
#include <linux/of.h>

#include <linux/platform_device.h>

#include <linux/slab.h>

#include <linux/reset-controller.h>



struct clk_dummy {

	struct clk_hw hw;

	struct reset_controller_dev reset;

	unsigned long rrate;

};



#define to_clk_dummy(_hw)	container_of(_hw, struct clk_dummy, hw)



#define RESET_MAX	100



static int dummy_clk_set_rate(struct clk_hw *hw, unsigned long rate,

					unsigned long parent_rate)

{
@@ -58,15 +62,35 @@ struct clk_ops clk_dummy_ops = { 
};

EXPORT_SYMBOL_GPL(clk_dummy_ops);



static int dummy_reset_assert(struct reset_controller_dev *rcdev,

				unsigned long id)

{

	pr_debug("%s\n", __func__);

	return 0;

}



static int dummy_reset_deassert(struct reset_controller_dev *rcdev,

				unsigned long id)

{

	pr_debug("%s\n", __func__);

	return 0;

}



static struct reset_control_ops dummy_reset_ops = {

	.assert         = dummy_reset_assert,

	.deassert       = dummy_reset_deassert,

};



/**

 * clk_register_dummy - register dummy clock with the

 *				   clock framework

 * @dev: device that is registering this clock

 * @name: name of this clock

 * @flags: framework-specific flags

 * @node: device node

 */

static struct clk *clk_register_dummy(struct device *dev, const char *name,

		unsigned long flags)

		unsigned long flags, struct device_node *node)

{

	struct clk_dummy *dummy;

	struct clk *clk;
@@ -85,8 +109,20 @@ static struct clk *clk_register_dummy(struct device *dev, const char *name, 


	/* register the clock */

	clk = clk_register(dev, &dummy->hw);

	if (IS_ERR(clk))

	if (IS_ERR(clk)) {

		kfree(dummy);

		return clk;

	}



	dummy->reset.of_node = node;

	dummy->reset.ops = &dummy_reset_ops;

	dummy->reset.nr_resets = RESET_MAX;



	if (reset_controller_register(&dummy->reset))

		pr_err("Failed to register reset controller for %s\n", name);

	else

		pr_info("Successfully registered dummy reset controller for %s\n",

								name);



	return clk;

}
@@ -101,10 +137,16 @@ static void of_dummy_clk_setup(struct device_node *node) 


	of_property_read_string(node, "clock-output-names", &clk_name);



	clk = clk_register_dummy(NULL, clk_name, 0);

	if (!IS_ERR(clk))

	clk = clk_register_dummy(NULL, clk_name, 0, node);

	if (!IS_ERR(clk)) {

		of_clk_add_provider(node, of_clk_src_simple_get, clk);

	} else {

		pr_err("Failed to register dummy clock controller for %s\n",

								clk_name);

		return;

	}



	pr_info("%s: Dummy clock registered\n", clk_name);

	pr_info("Successfully registered dummy clock controller for %s\n",

								clk_name);

}

CLK_OF_DECLARE(dummy_clk, "qcom,dummycc", of_dummy_clk_setup);