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: Shawn Guo <shawn.guo@xxxxxxxxxx>
---
drivers/clk/qcom/a53-pll.c | 59 +++++++++++++++++++++++++++++++++++++-
1 file changed, 58 insertions(+), 1 deletion(-)
diff --git a/drivers/clk/qcom/a53-pll.c b/drivers/clk/qcom/a53-pll.c
index 96a118be912d..9e6decb9c26f 100644
--- a/drivers/clk/qcom/a53-pll.c
+++ b/drivers/clk/qcom/a53-pll.c
@@ -6,9 +6,11 @@
* Author: Georgi Djakov <georgi.djakov@xxxxxxxxxx>
*/
+#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 = a53pll_freq;
+
+ 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);
--
2.17.1
