From: Leonard Crestez <leonard.crestez@nxp.com>
To: Georgi Djakov <georgi.djakov@linaro.org>,
Rob Herring <robh+dt@kernel.org>,
Chanwoo Choi <cw00.choi@samsung.com>
Cc: "Artur Świgoń" <a.swigon@partner.samsung.com>,
"Alexandre Bailon" <abailon@baylibre.com>,
"Rafael J. Wysocki" <rafael@kernel.org>,
"Jacky Bai" <ping.bai@nxp.com>,
"Anson Huang" <Anson.Huang@nxp.com>,
"Abel Vesa" <abel.vesa@nxp.com>,
"Krzysztof Kozlowski" <krzk@kernel.org>,
"MyungJoo Ham" <myungjoo.ham@samsung.com>,
"Kyungmin Park" <kyungmin.park@samsung.com>,
"Saravana Kannan" <saravanak@google.com>,
"Mark Rutland" <mark.rutland@arm.com>,
"Viresh Kumar" <viresh.kumar@linaro.org>,
"Shawn Guo" <shawnguo@kernel.org>,
"Dong Aisheng" <aisheng.dong@nxp.com>,
"Fabio Estevam" <fabio.estevam@nxp.com>,
"Stephen Boyd" <sboyd@kernel.org>,
"Michael Turquette" <mturquette@baylibre.com>,
"Matthias Kaehlcke" <mka@chromium.org>,
"Angus Ainslie" <angus@akkea.ca>,
"Martin Kepplinger" <martink@posteo.de>,
"Silvano di Ninno" <silvano.dininno@nxp.com>,
linux-pm@vger.kernel.org, kernel@pengutronix.de,
linux-imx@nxp.com, devicetree@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH RFC v6 2/9] PM / devfreq: Add generic imx bus scaling driver
Date: Thu, 14 Nov 2019 22:09:49 +0200 [thread overview]
Message-ID: <f329e715898a6b9fd0cee707a93fb1e144e31bd4.1573761527.git.leonard.crestez@nxp.com> (raw)
In-Reply-To: <cover.1573761527.git.leonard.crestez@nxp.com>
In-Reply-To: <cover.1573761527.git.leonard.crestez@nxp.com>
Add initial support for dynamic frequency switching on pieces of the imx
interconnect fabric.
All this driver does is set a clk rate based on an opp table, it does
not map register areas.
Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
---
drivers/devfreq/Kconfig | 9 ++
drivers/devfreq/Makefile | 1 +
drivers/devfreq/imx-devfreq.c | 150 ++++++++++++++++++++++++++++++++++
3 files changed, 160 insertions(+)
create mode 100644 drivers/devfreq/imx-devfreq.c
diff --git a/drivers/devfreq/Kconfig b/drivers/devfreq/Kconfig
index 923a6132e741..fef5ce831e90 100644
--- a/drivers/devfreq/Kconfig
+++ b/drivers/devfreq/Kconfig
@@ -98,10 +98,19 @@ config ARM_IMX8M_DDRC_DEVFREQ
select DEVFREQ_GOV_USERSPACE
help
This adds the DEVFREQ driver for the i.MX8M DDR Controller. It allows
adjusting DRAM frequency.
+config ARM_IMX_DEVFREQ
+ tristate "i.MX Generic DEVFREQ Driver"
+ depends on ARCH_MXC || COMPILE_TEST
+ select DEVFREQ_GOV_PASSIVE
+ select DEVFREQ_GOV_USERSPACE
+ help
+ This adds the generic DEVFREQ driver for i.MX interconnects. It
+ allows adjusting NIC/NOC frequency.
+
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 3eb4d5e6635c..61d0edee16f7 100644
--- a/drivers/devfreq/Makefile
+++ b/drivers/devfreq/Makefile
@@ -8,10 +8,11 @@ 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_IMX8M_DDRC_DEVFREQ) += imx8m-ddrc.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..620b344e87aa
--- /dev/null
+++ b/drivers/devfreq/imx-devfreq.c
@@ -0,0 +1,150 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 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)
+{
+ 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, "setup 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 initialize 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:[~2019-11-14 20:10 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-14 20:09 [PATCH RFC v6 0/9] interconnect: Add imx support via devfreq Leonard Crestez
2019-11-14 20:09 ` [PATCH RFC v6 1/9] dt-bindings: interconnect: Add bindings for imx8m noc Leonard Crestez
2019-12-16 1:12 ` Chanwoo Choi
2019-12-16 3:25 ` Chanwoo Choi
2019-12-16 15:09 ` Leonard Crestez
2019-12-17 0:15 ` Chanwoo Choi
2019-12-19 14:31 ` Leonard Crestez
2019-12-19 15:55 ` Chanwoo Choi
2019-12-19 19:11 ` Leonard Crestez
2019-11-14 20:09 ` Leonard Crestez [this message]
2019-11-20 14:08 ` [PATCH RFC v6 2/9] PM / devfreq: Add generic imx bus scaling driver Angus Ainslie
2019-11-20 15:04 ` Leonard Crestez
2019-11-20 15:29 ` Marco Felsch
2019-11-20 15:41 ` Angus Ainslie
2019-11-20 16:30 ` Leonard Crestez
2019-11-20 16:38 ` Angus Ainslie
2019-11-20 18:02 ` Leonard Crestez
2020-02-04 9:45 ` Martin Kepplinger
2020-02-13 10:53 ` Martin Kepplinger
2019-12-13 1:30 ` Chanwoo Choi
2019-12-13 1:51 ` Chanwoo Choi
2019-12-16 1:06 ` Chanwoo Choi
2019-12-16 14:57 ` Leonard Crestez
2019-12-17 0:41 ` Chanwoo Choi
2019-12-17 21:05 ` Leonard Crestez
2019-12-18 3:15 ` Chanwoo Choi
2019-12-18 10:10 ` Leonard Crestez
2019-12-18 10:46 ` Chanwoo Choi
2019-12-18 17:06 ` Chanwoo Choi
2019-11-14 20:09 ` [PATCH RFC v6 3/9] PM / devfreq: imx: Register interconnect device Leonard Crestez
2019-12-13 4:28 ` Chanwoo Choi
2019-12-16 15:00 ` Leonard Crestez
2019-12-17 1:02 ` Chanwoo Choi
2019-12-18 10:13 ` Leonard Crestez
2019-12-18 11:05 ` Chanwoo Choi
2019-12-18 17:13 ` Leonard Crestez
2019-12-19 7:07 ` Chanwoo Choi
2019-11-14 20:09 ` [PATCH RFC v6 4/9] interconnect: Add imx core driver Leonard Crestez
2019-12-12 7:29 ` Georgi Djakov
2019-12-19 0:18 ` Leonard Crestez
2019-11-14 20:09 ` [PATCH RFC v6 5/9] interconnect: imx: Add platform driver for imx8mm Leonard Crestez
2019-12-12 7:35 ` Georgi Djakov
2019-12-16 14:35 ` Leonard Crestez
2019-11-14 20:09 ` [PATCH RFC v6 6/9] interconnect: imx: Add platform driver for imx8mq Leonard Crestez
2019-11-14 20:09 ` [PATCH RFC v6 7/9] interconnect: imx: Add platform driver for imx8mn Leonard Crestez
2019-11-14 20:09 ` [PATCH RFC v6 8/9] arm64: dts: imx8m: Add NOC nodes Leonard Crestez
2019-11-14 20:09 ` [PATCH RFC v6 9/9] arm64: dts: imx8m: Add interconnect provider properties Leonard Crestez
2019-12-11 9:53 ` [PATCH RFC v6 0/9] interconnect: Add imx support via devfreq Leonard Crestez
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