Commit 5d9bc010 authored by Shawn Guo's avatar Shawn Guo Committed by Stephen Boyd
Browse files

clk: qcom: a53-pll: Add MSM8939 a53pll support 



MSM8939 has 3 a53pll clocks with different frequency table for Cluster0,
Cluster1 and CCI.  It adds function qcom_a53pll_get_freq_tbl() to create
pll_freq_tbl from OPP, so that those a53pll frequencies can be defined
in DT with operating-points-v2 bindings rather than being coded in the
driver.  In this case, one compatible rather than three would be needed
for these 3 a53pll clocks.

Signed-off-by: default avatarShawn Guo <shawn.guo@linaro.org>
Link: https://lore.kernel.org/r/20210704024032.11559-5-shawn.guo@linaro.org


Signed-off-by: default avatarStephen Boyd <sboyd@kernel.org>
parent f9a6a326

drivers/clk/qcom/a53-pll.c

+58 −1
Original line number Diff line number Diff line
@@ -6,9 +6,11 @@ 
 * Author: Georgi Djakov <georgi.djakov@linaro.org>

 */



#include <linux/clk.h>

#include <linux/clk-provider.h>

#include <linux/kernel.h>

#include <linux/platform_device.h>

#include <linux/pm_opp.h>

#include <linux/regmap.h>

#include <linux/module.h>
@@ -34,6 +36,55 @@ static const struct regmap_config a53pll_regmap_config = { 
	.fast_io		= true,

};



static struct pll_freq_tbl *qcom_a53pll_get_freq_tbl(struct device *dev)

{

	struct pll_freq_tbl *freq_tbl;

	unsigned long xo_freq;

	unsigned long freq;

	struct clk *xo_clk;

	int count;

	int ret;

	int i;



	xo_clk = devm_clk_get(dev, "xo");

	if (IS_ERR(xo_clk))

		return NULL;



	xo_freq = clk_get_rate(xo_clk);



	ret = devm_pm_opp_of_add_table(dev);

	if (ret)

		return NULL;



	count = dev_pm_opp_get_opp_count(dev);

	if (count <= 0)

		return NULL;



	freq_tbl = devm_kcalloc(dev, count + 1, sizeof(*freq_tbl), GFP_KERNEL);

	if (!freq_tbl)

		return NULL;



	for (i = 0, freq = 0; i < count; i++, freq++) {

		struct dev_pm_opp *opp;



		opp = dev_pm_opp_find_freq_ceil(dev, &freq);

		if (IS_ERR(opp))

			return NULL;



		/* Skip the freq that is not divisible */

		if (freq % xo_freq)

			continue;



		freq_tbl[i].freq = freq;

		freq_tbl[i].l = freq / xo_freq;

		freq_tbl[i].n = 1;



		dev_pm_opp_put(opp);

	}



	return freq_tbl;

}



static int qcom_a53pll_probe(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;
@@ -65,7 +116,12 @@ static int qcom_a53pll_probe(struct platform_device *pdev) 
	pll->mode_reg = 0x00;

	pll->status_reg = 0x1c;

	pll->status_bit = 16;



	pll->freq_tbl = qcom_a53pll_get_freq_tbl(dev);

	if (!pll->freq_tbl) {

		/* Fall on a53pll_freq if no freq_tbl is found from OPP */

		pll->freq_tbl = a53pll_freq;

	}



	/* Use an unique name by appending @unit-address */

	init.name = devm_kasprintf(dev, GFP_KERNEL, "a53pll%s",
@@ -96,6 +152,7 @@ static int qcom_a53pll_probe(struct platform_device *pdev) 


static const struct of_device_id qcom_a53pll_match_table[] = {

	{ .compatible = "qcom,msm8916-a53pll" },

	{ .compatible = "qcom,msm8939-a53pll" },

	{ }

};

MODULE_DEVICE_TABLE(of, qcom_a53pll_match_table);