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Commit 0f1bd39f authored by Patrick Daly's avatar Patrick Daly Committed by Deepak Katragadda
Browse files

clk: clock-local2: Support parsing gate-clocks from dt 



Similar to the cbc clock, the gate-clock also allows
enabling/disabling clock signals. However, no hw
feedback signal is available.

Change-Id: Ia2e4484ab817c603a810cf33b6f27ef73cf6b9c6
Signed-off-by: default avatarPatrick Daly <pdaly@codeaurora.org>
parent df4e399c

Documentation/devicetree/bindings/arm/msm/clock-controller-v2.txt

+26 −0
Original line number Diff line number Diff line
@@ -284,3 +284,29 @@ gcc_bam_dma_ahb_clk: gcc_bam_dma_ahb_clk { 
	qcom,en-bit = <12>;

	qcom,parent = <&pnoc_clk>;

};



*****************************************************************************



"qcom,gate-clk"



A simple clock which can only turn on or off.



Required Properties:

- compatible:		"qcom,gate-clk"

- qcom,en-offset:	Register offset from the region described in parent

			clock controller.

- qcom,en-bit:		Bit used to enable the clock



Recommended Properties:

- qcom,parent:		See "General Optional Properties"



Optional Properties:

- qcom,delay:		Delay(us) to use before/after turning on/off the clock.



mmss_gpll0_clk_src: mmss_gpll0_clk_src {

	compatible = "qcom,gate-clk";

	qcom,en-offset = <GCC_APCS_CLOCK_BRANCH_ENA_VOTE>;

	qcom,en-bit = <26>;

	qcom,parent = <&gpll0>;

	qcom,delay = <1>;

};

drivers/clk/qcom/clock-local2.c

+40 −0
Original line number Diff line number Diff line
@@ -1591,3 +1591,43 @@ static void *local_vote_clk_dt_parser(struct device *dev, 
	return msmclk_generic_clk_init(dev, np, &vote_clk->c);

}

MSMCLK_PARSER(local_vote_clk_dt_parser, "qcom,local-vote-clk", 0);



static void *gate_clk_dt_parser(struct device *dev, struct device_node *np)

{

	struct gate_clk *gate_clk;

	struct msmclk_data *drv;

	u32 en_bit, rc;



	gate_clk = devm_kzalloc(dev, sizeof(*gate_clk), GFP_KERNEL);

	if (!gate_clk) {

		dt_err(np, "memory alloc failure\n");

		return ERR_PTR(-ENOMEM);

	}



	drv = msmclk_parse_phandle(dev, np->parent->phandle);

	if (IS_ERR_OR_NULL(drv))

		return ERR_CAST(drv);

	gate_clk->base = &drv->base;



	rc = of_property_read_u32(np, "qcom,en-offset", &gate_clk->en_reg);

	if (rc) {

		dt_err(np, "missing qcom,en-offset dt property\n");

		return ERR_PTR(-EINVAL);

	}



	rc = of_property_read_u32(np, "qcom,en-bit", &en_bit);

	if (rc) {

		dt_err(np, "missing qcom,en-bit dt property\n");

		return ERR_PTR(-EINVAL);

	}

	gate_clk->en_mask = BIT(en_bit);



	/* Optional Property */

	rc = of_property_read_u32(np, "qcom,delay", &gate_clk->delay_us);

	if (rc)

		gate_clk->delay_us = 0;



	gate_clk->c.ops = &clk_ops_gate;

	return msmclk_generic_clk_init(dev, np, &gate_clk->c);

}

MSMCLK_PARSER(gate_clk_dt_parser, "qcom,gate-clk", 0);

include/soc/qcom/clock-local2.h

+3 −3
Original line number Diff line number Diff line
@@ -184,9 +184,9 @@ static inline struct measure_clk *to_measure_clk(struct clk *clk) 
 */

struct gate_clk {

	struct clk c;

	const u32 en_mask;

	const u32 en_reg;

	const unsigned int delay_us;

	u32 en_mask;

	u32 en_reg;

	unsigned int delay_us;

	void *const __iomem *base;

};