From: Georgi Djakov <georgi.djakov@linaro.org>
To: vireshk@kernel.org, nm@ti.com, sboyd@kernel.org,
rjw@rjwysocki.net, saravanak@google.com, sibis@codeaurora.org,
mka@chromium.org
Cc: robh+dt@kernel.org, rnayak@codeaurora.org,
bjorn.andersson@linaro.org, vincent.guittot@linaro.org,
jcrouse@codeaurora.org, evgreen@chromium.org,
linux-pm@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, georgi.djakov@linaro.org
Subject: [PATCH v8 07/10] cpufreq: dt: Add support for interconnect bandwidth scaling
Date: Tue, 12 May 2020 15:53:24 +0300 [thread overview]
Message-ID: <20200512125327.1868-8-georgi.djakov@linaro.org> (raw)
In-Reply-To: <20200512125327.1868-1-georgi.djakov@linaro.org>
In addition to clocks and regulators, some devices can scale the bandwidth
of their on-chip interconnect - for example between CPU and DDR memory. Add
support for that, so that platforms which support it can make use of it.
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
---
v8:
* Picked reviewed-by tag.
* Added a separate patch to check the number of paths in DT and validate
each one of them.
drivers/cpufreq/Kconfig | 1 +
drivers/cpufreq/cpufreq-dt.c | 15 +++++++++++++++
2 files changed, 16 insertions(+)
diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig
index c3e6bd59e920..db2ad54ee67f 100644
--- a/drivers/cpufreq/Kconfig
+++ b/drivers/cpufreq/Kconfig
@@ -217,6 +217,7 @@ config CPUFREQ_DT
config CPUFREQ_DT_PLATDEV
bool
+ depends on INTERCONNECT || !INTERCONNECT
help
This adds a generic DT based cpufreq platdev driver for frequency
management. This creates a 'cpufreq-dt' platform device, on the
diff --git a/drivers/cpufreq/cpufreq-dt.c b/drivers/cpufreq/cpufreq-dt.c
index 26fe8dfb9ce6..4ecef3257532 100644
--- a/drivers/cpufreq/cpufreq-dt.c
+++ b/drivers/cpufreq/cpufreq-dt.c
@@ -13,6 +13,7 @@
#include <linux/cpufreq.h>
#include <linux/cpumask.h>
#include <linux/err.h>
+#include <linux/interconnect.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/pm_opp.h>
@@ -95,6 +96,7 @@ static int resources_available(void)
struct device *cpu_dev;
struct regulator *cpu_reg;
struct clk *cpu_clk;
+ struct icc_path *cpu_path;
int ret = 0;
const char *name;
@@ -121,6 +123,19 @@ static int resources_available(void)
clk_put(cpu_clk);
+ cpu_path = of_icc_get(cpu_dev, NULL);
+ ret = PTR_ERR_OR_ZERO(cpu_path);
+ if (ret) {
+ if (ret == -EPROBE_DEFER)
+ dev_dbg(cpu_dev, "defer icc path: %d\n", ret);
+ else
+ dev_err(cpu_dev, "failed to get icc path: %d\n", ret);
+
+ return ret;
+ }
+
+ icc_put(cpu_path);
+
name = find_supply_name(cpu_dev);
/* Platform doesn't require regulator */
if (!name)
next prev parent reply other threads:[~2020-05-12 12:54 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-12 12:53 [PATCH v8 00/10] Introduce OPP bandwidth bindings Georgi Djakov
2020-05-12 12:53 ` [PATCH v8 01/10] dt-bindings: opp: Introduce opp-peak-kBps and opp-avg-kBps bindings Georgi Djakov
2020-05-12 12:53 ` [PATCH v8 02/10] OPP: Add helpers for reading the binding properties Georgi Djakov
2020-05-13 6:40 ` Viresh Kumar
2020-05-12 12:53 ` [PATCH v8 03/10] interconnect: Add of_icc_get_by_index() helper function Georgi Djakov
2020-05-12 12:53 ` [PATCH v8 04/10] OPP: Add support for parsing interconnect bandwidth Georgi Djakov
2020-05-12 21:35 ` Matthias Kaehlcke
2020-05-13 6:41 ` Viresh Kumar
2020-05-13 7:01 ` Viresh Kumar
2020-05-29 4:44 ` Viresh Kumar
2020-05-29 11:39 ` Sibi Sankar
2020-05-12 12:53 ` [PATCH v8 05/10] OPP: Add sanity checks in _read_opp_key() Georgi Djakov
2020-05-12 12:53 ` [PATCH v8 06/10] OPP: Update the bandwidth on OPP frequency changes Georgi Djakov
2020-05-12 12:53 ` Georgi Djakov [this message]
2020-05-12 12:53 ` [PATCH v8 08/10] cpufreq: dt: Validate all interconnect paths Georgi Djakov
2020-05-12 21:47 ` Matthias Kaehlcke
2020-05-13 6:42 ` Viresh Kumar
2020-05-12 12:53 ` [PATCH v8 09/10] dt-bindings: interconnect: Add interconnect-tags bindings Georgi Djakov
2020-05-13 10:19 ` Viresh Kumar
2020-05-19 18:58 ` Rob Herring
2020-05-19 19:57 ` Saravana Kannan
2020-05-20 18:51 ` Sibi Sankar
2020-05-20 19:13 ` Saravana Kannan
2020-05-26 17:08 ` Sibi Sankar
2020-05-12 12:53 ` [PATCH v8 10/10] OPP: Add support for setting interconnect-tags Georgi Djakov
2020-05-13 6:43 ` Viresh Kumar
2020-05-13 6:55 ` [PATCH v8 00/10] Introduce OPP bandwidth bindings Viresh Kumar
2020-05-13 10:10 ` Georgi Djakov
2020-05-13 10:18 ` Viresh Kumar
2020-05-18 11:41 ` [PATCH] opp: Expose bandwidth information via debugfs Viresh Kumar
2020-05-27 4:07 ` [PATCH] opp: Remove bandwidth votes when target_freq is zero Viresh Kumar
2020-05-27 4:13 ` [PATCH V2] " Viresh Kumar
2020-05-27 8:11 ` Georgi Djakov
2020-05-27 18:31 ` Sibi Sankar
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