Re: [PATCH v2 06/26] interconnect: icc-clk: add support for scaling using OPP

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On 26/06/2023 14:28, Konrad Dybcio wrote:
On 25.06.2023 22:25, Dmitry Baryshkov wrote:
Sometimes it might be required to scale the clock using the OPP
framework (e.g. to scale regulators following the required clock rate).
Extend the interconnec
't'

-clk framework to handle OPP case in addition to
scaling the clock.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
---
I think we should check for OPP at the icc-clk registration time,
instead of passing it as a parameter, e.g.:

qn.opp = IS_ERR(dev_pm_opp_get_opp_count)

Not sure if there's a more idiomatic way.

No. icc-clk is not limited to a single clock->icc conversion. So it is possible to create several interconnect links, only one of which should be the OPP-based one.


Konrad
  drivers/interconnect/icc-clk.c   | 13 +++++++++++--
  include/linux/interconnect-clk.h |  1 +
  2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/interconnect/icc-clk.c b/drivers/interconnect/icc-clk.c
index 4d43ebff4257..c7962acdcee7 100644
--- a/drivers/interconnect/icc-clk.c
+++ b/drivers/interconnect/icc-clk.c
@@ -7,10 +7,13 @@
  #include <linux/device.h>
  #include <linux/interconnect-clk.h>
  #include <linux/interconnect-provider.h>
+#include <linux/pm_opp.h>
struct icc_clk_node {
+	struct device *dev;
  	struct clk *clk;
  	bool enabled;
+	bool opp;
  };
struct icc_clk_provider {
@@ -25,12 +28,16 @@ struct icc_clk_provider {
  static int icc_clk_set(struct icc_node *src, struct icc_node *dst)
  {
  	struct icc_clk_node *qn = src->data;
+	unsigned long rate = icc_units_to_bps(src->peak_bw);
  	int ret;
if (!qn || !qn->clk)
  		return 0;
- if (!src->peak_bw) {
+	if (qn->opp)
+		return dev_pm_opp_set_rate(qn->dev, rate);
+
+	if (!rate) {
  		if (qn->enabled)
  			clk_disable_unprepare(qn->clk);
  		qn->enabled = false;
@@ -45,7 +52,7 @@ static int icc_clk_set(struct icc_node *src, struct icc_node *dst)
  		qn->enabled = true;
  	}
- return clk_set_rate(qn->clk, icc_units_to_bps(src->peak_bw));
+	return clk_set_rate(qn->clk, rate);
  }
static int icc_clk_get_bw(struct icc_node *node, u32 *avg, u32 *peak)
@@ -106,7 +113,9 @@ struct icc_provider *icc_clk_register(struct device *dev,
  	icc_provider_init(provider);
for (i = 0, j = 0; i < num_clocks; i++) {
+		qp->clocks[i].dev = dev;
  		qp->clocks[i].clk = data[i].clk;
+		qp->clocks[i].opp = data[i].opp;
node = icc_node_create(first_id + j);
  		if (IS_ERR(node)) {
diff --git a/include/linux/interconnect-clk.h b/include/linux/interconnect-clk.h
index 0cd80112bea5..c695e5099901 100644
--- a/include/linux/interconnect-clk.h
+++ b/include/linux/interconnect-clk.h
@@ -11,6 +11,7 @@ struct device;
  struct icc_clk_data {
  	struct clk *clk;
  	const char *name;
+	bool opp;
  };
struct icc_provider *icc_clk_register(struct device *dev,

--
With best wishes
Dmitry




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