From: Saravana Kannan <saravanak@google.com>
To: Georgi Djakov <georgi.djakov@linaro.org>,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Viresh Kumar <vireshk@kernel.org>, Nishanth Menon <nm@ti.com>,
Stephen Boyd <sboyd@kernel.org>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Saravana Kannan <saravanak@google.com>,
vincent.guittot@linaro.org, seansw@qti.qualcomm.com,
daidavid1@codeaurora.org, Rajendra Nayak <rnayak@codeaurora.org>,
sibis@codeaurora.org, bjorn.andersson@linaro.org,
evgreen@chromium.org, kernel-team@android.com,
linux-pm@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH v3 2/6] OPP: Add support for bandwidth OPP tables
Date: Tue, 2 Jul 2019 18:10:16 -0700 [thread overview]
Message-ID: <20190703011020.151615-3-saravanak@google.com> (raw)
In-Reply-To: <20190703011020.151615-1-saravanak@google.com>
Not all devices quantify their performance points in terms of frequency.
Devices like interconnects quantify their performance points in terms of
bandwidth. We need a way to represent these bandwidth levels in OPP. So,
add support for parsing bandwidth OPPs from DT.
Signed-off-by: Saravana Kannan <saravanak@google.com>
---
drivers/opp/of.c | 34 ++++++++++++++++++++++++++++++++--
drivers/opp/opp.h | 4 +++-
2 files changed, 35 insertions(+), 3 deletions(-)
diff --git a/drivers/opp/of.c b/drivers/opp/of.c
index c10c782d15aa..54fa70ed2adc 100644
--- a/drivers/opp/of.c
+++ b/drivers/opp/of.c
@@ -552,6 +552,35 @@ void dev_pm_opp_of_remove_table(struct device *dev)
}
EXPORT_SYMBOL_GPL(dev_pm_opp_of_remove_table);
+static int _read_opp_key(struct dev_pm_opp *new_opp, struct device_node *np)
+{
+ int ret;
+ u64 rate;
+ u32 bw;
+
+ ret = of_property_read_u64(np, "opp-hz", &rate);
+ if (!ret) {
+ /*
+ * Rate is defined as an unsigned long in clk API, and so
+ * casting explicitly to its type. Must be fixed once rate is 64
+ * bit guaranteed in clk API.
+ */
+ new_opp->rate = (unsigned long)rate;
+ return 0;
+ }
+
+ ret = of_property_read_u32(np, "opp-peak-KBps", &bw);
+ if (ret)
+ return ret;
+ new_opp->rate = (unsigned long) &bw;
+
+ ret = of_property_read_u32(np, "opp-avg-KBps", &bw);
+ if (!ret)
+ new_opp->avg_bw = (unsigned long) &bw;
+
+ return 0;
+}
+
/**
* _opp_add_static_v2() - Allocate static OPPs (As per 'v2' DT bindings)
* @opp_table: OPP table
@@ -589,11 +618,12 @@ static struct dev_pm_opp *_opp_add_static_v2(struct opp_table *opp_table,
if (!new_opp)
return ERR_PTR(-ENOMEM);
- ret = of_property_read_u64(np, "opp-hz", &rate);
+ ret = _read_opp_key(new_opp, np);
if (ret < 0) {
/* "opp-hz" is optional for devices like power domains. */
if (!opp_table->is_genpd) {
- dev_err(dev, "%s: opp-hz not found\n", __func__);
+ dev_err(dev, "%s: opp-hz or opp-peak-bw not found\n",
+ __func__);
goto free_opp;
}
diff --git a/drivers/opp/opp.h b/drivers/opp/opp.h
index 569b3525aa67..ead2cdafe957 100644
--- a/drivers/opp/opp.h
+++ b/drivers/opp/opp.h
@@ -59,7 +59,8 @@ extern struct list_head opp_tables;
* @turbo: true if turbo (boost) OPP
* @suspend: true if suspend OPP
* @pstate: Device's power domain's performance state.
- * @rate: Frequency in hertz
+ * @rate: Frequency in hertz OR Peak bandwidth in kilobytes per second
+ * @avg_bw: Average bandwidth in kilobytes per second
* @level: Performance level
* @supplies: Power supplies voltage/current values
* @clock_latency_ns: Latency (in nanoseconds) of switching to this OPP's
@@ -81,6 +82,7 @@ struct dev_pm_opp {
bool suspend;
unsigned int pstate;
unsigned long rate;
+ unsigned long avg_bw;
unsigned int level;
struct dev_pm_opp_supply *supplies;
--
2.22.0.410.gd8fdbe21b5-goog
next prev parent reply other threads:[~2019-07-03 1:10 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-03 1:10 [PATCH v3 0/6] Introduce Bandwidth OPPs for interconnect paths Saravana Kannan
2019-07-03 1:10 ` [PATCH v3 1/6] dt-bindings: opp: Introduce opp-peak-KBps and opp-avg-KBps bindings Saravana Kannan
2019-07-16 17:25 ` Sibi Sankar
2019-07-16 18:58 ` Saravana Kannan
2019-07-22 23:35 ` Rob Herring
2019-07-22 23:40 ` Saravana Kannan
2019-07-23 14:26 ` Rob Herring
2019-07-24 0:18 ` Saravana Kannan
2019-07-17 7:54 ` Viresh Kumar
2019-07-17 20:29 ` Saravana Kannan
2019-07-18 4:35 ` Viresh Kumar
2019-07-18 17:26 ` Saravana Kannan
2019-07-26 16:24 ` Georgi Djakov
2019-07-26 19:08 ` Saravana Kannan
2019-07-03 1:10 ` Saravana Kannan [this message]
2019-07-16 17:33 ` [PATCH v3 2/6] OPP: Add support for bandwidth OPP tables Sibi Sankar
2019-07-16 19:10 ` Saravana Kannan
2019-07-30 10:57 ` Amit Kucheria
2019-07-30 23:20 ` Saravana Kannan
2019-07-03 1:10 ` [PATCH v3 3/6] OPP: Add helper function " Saravana Kannan
2019-07-03 1:10 ` [PATCH v3 4/6] OPP: Add API to find an OPP table from its DT node Saravana Kannan
2019-07-03 1:10 ` [PATCH v3 5/6] dt-bindings: interconnect: Add interconnect-opp-table property Saravana Kannan
2019-07-22 23:39 ` Rob Herring
2019-07-22 23:43 ` Saravana Kannan
2019-07-23 2:21 ` Viresh Kumar
2019-07-03 1:10 ` [PATCH v3 6/6] interconnect: Add OPP table support for interconnects Saravana Kannan
2019-07-03 6:45 ` Vincent Guittot
2019-07-03 21:33 ` Saravana Kannan
2019-07-04 7:12 ` Vincent Guittot
2019-07-07 21:48 ` Saravana Kannan
2019-07-09 7:25 ` Vincent Guittot
2019-07-09 19:02 ` Saravana Kannan
2019-07-15 8:16 ` Vincent Guittot
2019-07-16 0:55 ` Saravana Kannan
2019-07-24 7:16 ` Vincent Guittot
2019-07-26 16:25 ` Georgi Djakov
2019-07-26 19:08 ` Saravana Kannan
2019-07-03 6:36 ` [PATCH v3 0/6] Introduce Bandwidth OPPs for interconnect paths Viresh Kumar
2019-07-03 20:35 ` Saravana Kannan
2019-07-17 10:32 ` Viresh Kumar
2019-07-17 20:34 ` Saravana Kannan
2019-07-18 5:37 ` Viresh Kumar
2019-07-19 4:12 ` Saravana Kannan
2019-07-29 9:24 ` Viresh Kumar
2019-07-29 20:12 ` Saravana Kannan
2019-07-30 3:01 ` Viresh Kumar
2019-08-03 7:36 ` Saravana Kannan
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