Merge tag 'devfreq-next-for-5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/linux

Pull devfreq material for v5.14 from Chanwoo Choi:

 1. Update devfreq core

  - Use DEVICE_ATTR_RW macro for devfreq userspace governor.

  - Add missing error code in devfreq_add_device().

  - Fix get_target_freq() when not using required-opp.

2. Update devfreq drivers

  - Remove unneeded get_dev_status() and polling_ms from imx-bus.c,
    because imx-bus.c doesn't support simple_ondemand.

  - Remove unneeded DEVFREQ_GOV_SIMPLE_ONDEMAND dependecy from
    imx8m-ddrc.c, because it doesn't support the simple_ondemand
    governor.

  - Use tegra30-devfreq.c as thermal cooling device.

  - Convert dt-binding doc style to yaml and add cooling-cells
    property information to dt-binding doc for tegra30-devfreq.c.

* tag 'devfreq-next-for-5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/linux:
  PM / devfreq: passive: Fix get_target_freq when not using required-opp
  dt-bindings: devfreq: tegra30-actmon: Add cooling-cells
  dt-bindings: devfreq: tegra30-actmon: Convert to schema
  PM / devfreq: userspace: Use DEVICE_ATTR_RW macro
  PM / devfreq: imx8m-ddrc: Remove DEVFREQ_GOV_SIMPLE_ONDEMAND dependency
  PM / devfreq: tegra30: Support thermal cooling
  PM / devfreq: imx-bus: Remove imx_bus_get_dev_status
  PM / devfreq: Add missing error code in devfreq_add_device()

Author: rafaeljw

Documentation/devicetree/bindings/arm/tegra/nvidia,tegra30-actmon.txt

@@ -0,0 +1,126 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/devfreq/nvidia,tegra30-actmon.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NVIDIA Tegra30 Activity Monitor
+
+maintainers:
+  - Dmitry Osipenko <digetx@gmail.com>
+  - Jon Hunter <jonathanh@nvidia.com>
+  - Thierry Reding <thierry.reding@gmail.com>
+
+description: |
+  The activity monitor block collects statistics about the behaviour of other
+  components in the system. This information can be used to derive the rate at
+  which the external memory needs to be clocked in order to serve all requests
+  from the monitored clients.
+
+properties:
+  compatible:
+    enum:
+      - nvidia,tegra30-actmon
+      - nvidia,tegra114-actmon
+      - nvidia,tegra124-actmon
+      - nvidia,tegra210-actmon
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 2
+
+  clock-names:
+    items:
+      - const: actmon
+      - const: emc
+
+  resets:
+    maxItems: 1
+
+  reset-names:
+    items:
+      - const: actmon
+
+  interrupts:
+    maxItems: 1
+
+  interconnects:
+    minItems: 1
+    maxItems: 12
+
+  interconnect-names:
+    minItems: 1
+    maxItems: 12
+    description:
+      Should include name of the interconnect path for each interconnect
+      entry. Consult TRM documentation for information about available
+      memory clients, see MEMORY CONTROLLER and ACTIVITY MONITOR sections.
+
+  operating-points-v2:
+    description:
+      Should contain freqs and voltages and opp-supported-hw property, which
+      is a bitfield indicating SoC speedo ID mask.
+
+  "#cooling-cells":
+    const: 2
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - resets
+  - reset-names
+  - interrupts
+  - interconnects
+  - interconnect-names
+  - operating-points-v2
+  - "#cooling-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/memory/tegra30-mc.h>
+
+    mc: memory-controller@7000f000 {
+        compatible = "nvidia,tegra30-mc";
+        reg = <0x7000f000 0x400>;
+        clocks = <&clk 32>;
+        clock-names = "mc";
+
+        interrupts = <0 77 4>;
+
+        #iommu-cells = <1>;
+        #reset-cells = <1>;
+        #interconnect-cells = <1>;
+    };
+
+    emc: external-memory-controller@7000f400 {
+        compatible = "nvidia,tegra30-emc";
+        reg = <0x7000f400 0x400>;
+        interrupts = <0 78 4>;
+        clocks = <&clk 57>;
+
+        nvidia,memory-controller = <&mc>;
+        operating-points-v2 = <&dvfs_opp_table>;
+        power-domains = <&domain>;
+
+        #interconnect-cells = <0>;
+    };
+
+    actmon@6000c800 {
+        compatible = "nvidia,tegra30-actmon";
+        reg = <0x6000c800 0x400>;
+        interrupts = <0 45 4>;
+        clocks = <&clk 119>, <&clk 57>;
+        clock-names = "actmon", "emc";
+        resets = <&rst 119>;
+        reset-names = "actmon";
+        operating-points-v2 = <&dvfs_opp_table>;
+        interconnects = <&mc TEGRA30_MC_MPCORER &emc>;
+        interconnect-names = "cpu-read";
+        #cooling-cells = <2>;
+    };

Documentation/devicetree/bindings/devfreq/nvidia,tegra30-actmon.yaml

@@ -103,7 +103,6 @@ config ARM_IMX8M_DDRC_DEVFREQ
 	tristate "i.MX8M DDRC DEVFREQ Driver"
 	depends on (ARCH_MXC && HAVE_ARM_SMCCC) || \
 		(COMPILE_TEST && HAVE_ARM_SMCCC)
-	select DEVFREQ_GOV_SIMPLE_ONDEMAND
 	select DEVFREQ_GOV_USERSPACE
 	help
 	  This adds the DEVFREQ driver for the i.MX8M DDR Controller. It allows

drivers/devfreq/Kconfig

@@ -823,6 +823,7 @@ struct devfreq *devfreq_add_device(struct device *dev,
 	if (devfreq->profile->timer < 0
 		|| devfreq->profile->timer >= DEVFREQ_TIMER_NUM) {
 		mutex_unlock(&devfreq->lock);
+		err = -EINVAL;
 		goto err_dev;
 	}
 

drivers/devfreq/devfreq.c

@@ -65,14 +65,15 @@ static int devfreq_passive_get_target_freq(struct devfreq *devfreq,
 		dev_pm_opp_put(p_opp);
 
 		if (IS_ERR(opp))
-			return PTR_ERR(opp);
+			goto no_required_opp;
 
 		*freq = dev_pm_opp_get_freq(opp);
 		dev_pm_opp_put(opp);
 
 		return 0;
 	}
 
+no_required_opp:
 	/*
 	 * Get the OPP table's index of decided frequency by governor
 	 * of parent device.

drivers/devfreq/governor_passive.c

@@ -31,8 +31,8 @@ static int devfreq_userspace_func(struct devfreq *df, unsigned long *freq)
 	return 0;
 }
 
-static ssize_t store_freq(struct device *dev, struct device_attribute *attr,
-			  const char *buf, size_t count)
+static ssize_t set_freq_store(struct device *dev, struct device_attribute *attr,
+			      const char *buf, size_t count)
 {
 	struct devfreq *devfreq = to_devfreq(dev);
 	struct userspace_data *data;
@@ -52,8 +52,8 @@ static ssize_t store_freq(struct device *dev, struct device_attribute *attr,
 	return err;
 }
 
-static ssize_t show_freq(struct device *dev, struct device_attribute *attr,
-			 char *buf)
+static ssize_t set_freq_show(struct device *dev,
+			     struct device_attribute *attr, char *buf)
 {
 	struct devfreq *devfreq = to_devfreq(dev);
 	struct userspace_data *data;
@@ -70,7 +70,7 @@ static ssize_t show_freq(struct device *dev, struct device_attribute *attr,
 	return err;
 }
 
-static DEVICE_ATTR(set_freq, 0644, show_freq, store_freq);
+static DEVICE_ATTR_RW(set_freq);
 static struct attribute *dev_entries[] = {
 	&dev_attr_set_freq.attr,
 	NULL,

drivers/devfreq/governor_userspace.c

@@ -45,18 +45,6 @@ static int imx_bus_get_cur_freq(struct device *dev, unsigned long *freq)
 	return 0;
 }
 
-static int imx_bus_get_dev_status(struct device *dev,
-		struct devfreq_dev_status *stat)
-{
-	struct imx_bus *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_bus_exit(struct device *dev)
 {
 	struct imx_bus *priv = dev_get_drvdata(dev);
@@ -129,9 +117,7 @@ static int imx_bus_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	priv->profile.polling_ms = 1000;
 	priv->profile.target = imx_bus_target;
-	priv->profile.get_dev_status = imx_bus_get_dev_status;
 	priv->profile.exit = imx_bus_exit;
 	priv->profile.get_cur_freq = imx_bus_get_cur_freq;
 	priv->profile.initial_freq = clk_get_rate(priv->clk);

drivers/devfreq/imx-bus.c

@@ -688,6 +688,7 @@ static struct devfreq_dev_profile tegra_devfreq_profile = {
 	.polling_ms	= ACTMON_SAMPLING_PERIOD,
 	.target		= tegra_devfreq_target,
 	.get_dev_status	= tegra_devfreq_get_dev_status,
+	.is_cooling_device = true,
 };
 
 static int tegra_governor_get_target(struct devfreq *devfreq,