From: Leonard Crestez <leonard.crestez@nxp.com>
To: Stephen Boyd <sboyd@kernel.org>,
MyungJoo Ham <myungjoo.ham@samsung.com>,
Kyungmin Park <kyungmin.park@samsung.com>,
Rob Herring <robh+dt@kernel.org>
Cc: "Shawn Guo" <shawnguo@kernel.org>,
"Michael Turquette" <mturquette@baylibre.com>,
"Chanwoo Choi" <cw00.choi@samsung.com>,
"Artur Świgoń" <a.swigon@partner.samsung.com>,
"Saravana Kannan" <saravanak@google.com>,
"Krzysztof Kozlowski" <krzk@kernel.org>,
"Alexandre Bailon" <abailon@baylibre.com>,
"Georgi Djakov" <georgi.djakov@linaro.org>,
"Dong Aisheng" <aisheng.dong@nxp.com>,
"Abel Vesa" <abel.vesa@nxp.com>, "Jacky Bai" <ping.bai@nxp.com>,
"Anson Huang" <Anson.Huang@nxp.com>,
"Fabio Estevam" <fabio.estevam@nxp.com>,
"Viresh Kumar" <viresh.kumar@linaro.org>,
"Will Deacon" <will@kernel.org>,
"Mark Rutland" <mark.rutland@arm.com>,
devicetree@vger.kernel.org, linux-pm@vger.kernel.org,
linux-imx@nxp.com, kernel@pengutronix.de,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH 3/7] PM / devfreq: Add generic imx bus driver
Date: Mon, 12 Aug 2019 21:49:47 +0300 [thread overview]
Message-ID: <dbdd1ae60993d5fe73ce5b446b2c7d559c981cf1.1565633880.git.leonard.crestez@nxp.com> (raw)
In-Reply-To: <cover.1565633880.git.leonard.crestez@nxp.com>
In-Reply-To: <cover.1565633880.git.leonard.crestez@nxp.com>
Add initial support for dynamic frequency switching on pieces of the imx
interconnect fabric.
All this driver actually does is set a clk rate based on an opp table.
No attempt is made to map registers or anything clever.
Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
---
drivers/devfreq/Kconfig | 12 +++
drivers/devfreq/Makefile | 1 +
drivers/devfreq/imx-devfreq.c | 148 ++++++++++++++++++++++++++++++++++
3 files changed, 161 insertions(+)
create mode 100644 drivers/devfreq/imx-devfreq.c
diff --git a/drivers/devfreq/Kconfig b/drivers/devfreq/Kconfig
index defe1d438710..9088a151bafe 100644
--- a/drivers/devfreq/Kconfig
+++ b/drivers/devfreq/Kconfig
@@ -90,10 +90,22 @@ config ARM_EXYNOS_BUS_DEVFREQ
Each memory bus group could contain many memoby bus block. It reads
PPMU counters of memory controllers by using DEVFREQ-event device
and adjusts the operating frequencies and voltages with OPP support.
This does not yet operate with optimal voltages.
+config ARM_IMX_DEVFREQ
+ tristate "i.MX DEVFREQ Driver"
+ depends on ARCH_MXC || COMPILE_TEST
+ select DEVFREQ_GOV_PASSIVE
+ select DEVFREQ_GOV_SIMPLE_ONDEMAND
+ select DEVFREQ_GOV_USERSPACE
+ select PM_OPP
+ help
+ This adds the DEVFREQ driver for the i.MX family of SoCs.
+ It allows adjusting frequencies for DDRC (DDR Controller) and various
+ NICs and NOCs which form the SOC interconnect fabric
+
config ARM_TEGRA_DEVFREQ
tristate "NVIDIA Tegra30/114/124/210 DEVFREQ Driver"
depends on ARCH_TEGRA_3x_SOC || ARCH_TEGRA_114_SOC || \
ARCH_TEGRA_132_SOC || ARCH_TEGRA_124_SOC || \
ARCH_TEGRA_210_SOC || \
diff --git a/drivers/devfreq/Makefile b/drivers/devfreq/Makefile
index 338ae8440db6..c2463ed4c934 100644
--- a/drivers/devfreq/Makefile
+++ b/drivers/devfreq/Makefile
@@ -7,10 +7,11 @@ obj-$(CONFIG_DEVFREQ_GOV_POWERSAVE) += governor_powersave.o
obj-$(CONFIG_DEVFREQ_GOV_USERSPACE) += governor_userspace.o
obj-$(CONFIG_DEVFREQ_GOV_PASSIVE) += governor_passive.o
# DEVFREQ Drivers
obj-$(CONFIG_ARM_EXYNOS_BUS_DEVFREQ) += exynos-bus.o
+obj-$(CONFIG_ARM_IMX_DEVFREQ) += imx-devfreq.o
obj-$(CONFIG_ARM_RK3399_DMC_DEVFREQ) += rk3399_dmc.o
obj-$(CONFIG_ARM_TEGRA_DEVFREQ) += tegra30-devfreq.o
obj-$(CONFIG_ARM_TEGRA20_DEVFREQ) += tegra20-devfreq.o
# DEVFREQ Event Drivers
diff --git a/drivers/devfreq/imx-devfreq.c b/drivers/devfreq/imx-devfreq.c
new file mode 100644
index 000000000000..702a4368af7d
--- /dev/null
+++ b/drivers/devfreq/imx-devfreq.c
@@ -0,0 +1,148 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2019 NXP
+ */
+
+#include <linux/clk.h>
+#include <linux/devfreq.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/pm_opp.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+struct imx_devfreq {
+ struct devfreq_dev_profile profile;
+ struct devfreq *devfreq;
+ struct clk *clk;
+ struct devfreq_passive_data passive_data;
+};
+
+static int imx_devfreq_target(struct device *dev, unsigned long *freq, u32 flags)
+{
+ struct imx_devfreq *priv = dev_get_drvdata(dev);
+ struct dev_pm_opp *new_opp;
+ unsigned long new_freq;
+ int ret;
+
+ new_opp = devfreq_recommended_opp(dev, freq, flags);
+ if (IS_ERR(new_opp)) {
+ ret = PTR_ERR(new_opp);
+ dev_err(dev, "failed to get recommended opp: %d\n", ret);
+ return ret;
+ }
+ new_freq = dev_pm_opp_get_freq(new_opp);
+ dev_pm_opp_put(new_opp);
+
+ return clk_set_rate(priv->clk, new_freq);
+}
+
+static int imx_devfreq_get_cur_freq(struct device *dev, unsigned long *freq)
+{
+ struct imx_devfreq *priv = dev_get_drvdata(dev);
+
+ *freq = clk_get_rate(priv->clk);
+
+ return 0;
+}
+
+static int imx_devfreq_get_dev_status(struct device *dev,
+ struct devfreq_dev_status *stat)
+{
+ struct imx_devfreq *priv = dev_get_drvdata(dev);
+
+ stat->busy_time = 0;
+ stat->total_time = 0;
+ stat->current_frequency = clk_get_rate(priv->clk);
+
+ return 0;
+}
+
+static void imx_devfreq_exit(struct device *dev)
+{
+ return dev_pm_opp_of_remove_table(dev);
+}
+
+static int imx_devfreq_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct imx_devfreq *priv;
+ const char *gov = DEVFREQ_GOV_USERSPACE;
+ void *govdata = NULL;
+ int ret;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->clk = devm_clk_get(dev, NULL);
+ if (IS_ERR(priv->clk)) {
+ ret = PTR_ERR(priv->clk);
+ dev_err(dev, "failed to fetch clk: %d\n", ret);
+ return ret;
+ }
+ platform_set_drvdata(pdev, priv);
+
+ ret = dev_pm_opp_of_add_table(dev);
+ if (ret < 0) {
+ dev_err(dev, "failed to get OPP table\n");
+ return ret;
+ }
+
+ priv->profile.polling_ms = 1000;
+ priv->profile.target = imx_devfreq_target;
+ priv->profile.get_dev_status = imx_devfreq_get_dev_status;
+ priv->profile.exit = imx_devfreq_exit;
+ priv->profile.get_cur_freq = imx_devfreq_get_cur_freq;
+ priv->profile.initial_freq = clk_get_rate(priv->clk);
+
+ /* Handle passive devfreq parent link */
+ priv->passive_data.parent = devfreq_get_devfreq_by_phandle(dev, 0);
+ if (!IS_ERR(priv->passive_data.parent)) {
+ dev_info(dev, "passive link to %s\n",
+ dev_name(priv->passive_data.parent->dev.parent));
+ gov = DEVFREQ_GOV_PASSIVE;
+ govdata = &priv->passive_data;
+ } else if (priv->passive_data.parent != ERR_PTR(-ENODEV)) {
+ // -ENODEV means no parent: not an error.
+ ret = PTR_ERR(priv->passive_data.parent);
+ if (ret != -EPROBE_DEFER)
+ dev_warn(dev, "failed to get passive parent: %d\n", ret);
+ goto err;
+ }
+
+ priv->devfreq = devm_devfreq_add_device(dev, &priv->profile,
+ gov, govdata);
+ if (IS_ERR(priv->devfreq)) {
+ ret = PTR_ERR(priv->devfreq);
+ dev_err(dev, "failed to add devfreq device: %d\n", ret);
+ goto err;
+ }
+
+ return 0;
+
+err:
+ dev_pm_opp_of_remove_table(dev);
+ return ret;
+}
+
+static const struct of_device_id imx_devfreq_of_match[] = {
+ { .compatible = "fsl,imx8m-noc", },
+ { .compatible = "fsl,imx8m-nic", },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, imx_devfreq_of_match);
+
+static struct platform_driver imx_devfreq_platdrv = {
+ .probe = imx_devfreq_probe,
+ .driver = {
+ .name = "imx-devfreq",
+ .of_match_table = of_match_ptr(imx_devfreq_of_match),
+ },
+};
+module_platform_driver(imx_devfreq_platdrv);
+
+MODULE_DESCRIPTION("Generic i.MX bus frequency driver");
+MODULE_AUTHOR("Leonard Crestez <leonard.crestez@nxp.com>");
+MODULE_LICENSE("GPL v2");
--
2.17.1
next prev parent reply other threads:[~2019-08-12 18:50 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-12 18:49 [PATCH 0/7] PM / devfreq: Add initial imx support Leonard Crestez
2019-08-12 18:49 ` [PATCH 1/7] clk: imx8m: Set CLK_GET_RATE_NOCACHE on dram_alt/apb Leonard Crestez
2019-08-12 18:49 ` [PATCH 2/7] dt-bindings: devfreq: Add bindings for generic imx buses Leonard Crestez
2019-08-12 19:46 ` Rob Herring
2019-08-13 1:32 ` Leonard Crestez
2019-08-13 14:06 ` Rob Herring
2019-08-13 14:59 ` Leonard Crestez
2019-08-12 18:49 ` Leonard Crestez [this message]
2019-08-12 18:49 ` [PATCH 4/7] dt-bindings: devfreq: Add bindings for imx ddr controller Leonard Crestez
2019-08-12 19:51 ` Rob Herring
2019-08-12 18:49 ` [PATCH 5/7] PM / devfreq: Add dynamic scaling " Leonard Crestez
2019-08-12 18:49 ` [PATCH 6/7] PM / devfreq: imx-ddrc: Measure bandwidth with perf Leonard Crestez
2019-08-12 18:49 ` [PATCH 7/7] arm64: dts: imx8mm: Add devfreq nodes Leonard Crestez
[not found] ` <CGME20190812185002epcas1p1c528b12d20771cf4887907fdfd716e22@epcms1p2>
2019-08-13 2:25 ` [PATCH 2/7] dt-bindings: devfreq: Add bindings for generic imx buses MyungJoo Ham
[not found] ` <CGME20190812185005epcas3p10a9a3dbb90489534222e093c63f27900@epcms1p3>
2019-08-13 2:33 ` [PATCH 3/7] PM / devfreq: Add generic imx bus driver MyungJoo Ham
2019-08-13 3:02 ` Leonard Crestez
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=dbdd1ae60993d5fe73ce5b446b2c7d559c981cf1.1565633880.git.leonard.crestez@nxp.com \
--to=leonard.crestez@nxp.com \
--cc=Anson.Huang@nxp.com \
--cc=a.swigon@partner.samsung.com \
--cc=abailon@baylibre.com \
--cc=abel.vesa@nxp.com \
--cc=aisheng.dong@nxp.com \
--cc=cw00.choi@samsung.com \
--cc=devicetree@vger.kernel.org \
--cc=fabio.estevam@nxp.com \
--cc=georgi.djakov@linaro.org \
--cc=kernel@pengutronix.de \
--cc=krzk@kernel.org \
--cc=kyungmin.park@samsung.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-imx@nxp.com \
--cc=linux-pm@vger.kernel.org \
--cc=mark.rutland@arm.com \
--cc=mturquette@baylibre.com \
--cc=myungjoo.ham@samsung.com \
--cc=ping.bai@nxp.com \
--cc=robh+dt@kernel.org \
--cc=saravanak@google.com \
--cc=sboyd@kernel.org \
--cc=shawnguo@kernel.org \
--cc=viresh.kumar@linaro.org \
--cc=will@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).