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1 files changed, 182 insertions, 0 deletions
diff --git a/extras/recipes-kernel/linux/linux-omap/dvfs/0008-OMAP-Introduce-API-to-register-a-device-with-a-volta.patch b/extras/recipes-kernel/linux/linux-omap/dvfs/0008-OMAP-Introduce-API-to-register-a-device-with-a-volta.patch
new file mode 100644
index 00000000..d00751d4
--- /dev/null
+++ b/extras/recipes-kernel/linux/linux-omap/dvfs/0008-OMAP-Introduce-API-to-register-a-device-with-a-volta.patch
@@ -0,0 +1,182 @@
1From 3fcad983e7df504ecb1d0db79e3fe2e3abc44850 Mon Sep 17 00:00:00 2001
2From: Thara Gopinath <thara@ti.com>
3Date: Fri, 29 Oct 2010 20:43:24 +0530
4Subject: [PATCH 08/20] OMAP: Introduce API to register a device with a voltagedomain
5
6This patch adds an API in the voltage layer that
7can be used during omap_device_build to register the built
8device with the voltage domain. This API is to be typically called
9only once per device during the device registeration. This approach
10makes it easy during dvfs to scale all the devices associated with
11a voltage domain and then scale the voltage domain.
12
13Signed-off-by: Thara Gopinath <thara@ti.com>
14---
15 arch/arm/mach-omap2/voltage.c | 50 +++++++++++++++++++++++++++++
16 arch/arm/plat-omap/include/plat/voltage.h | 7 +++-
17 arch/arm/plat-omap/omap_device.c | 12 +++++++
18 3 files changed, 68 insertions(+), 1 deletions(-)
19
20diff --git a/arch/arm/mach-omap2/voltage.c b/arch/arm/mach-omap2/voltage.c
21index 76c98c6..7381fa6 100644
22--- a/arch/arm/mach-omap2/voltage.c
23+++ b/arch/arm/mach-omap2/voltage.c
24@@ -134,6 +134,11 @@ struct omap_vdd_user_list {
25 u32 volt;
26 };
27
28+struct omap_vdd_dev_list {
29+ struct device *dev;
30+ struct list_head node;
31+};
32+
33 /**
34 * omap_vdd_info - Per Voltage Domain info
35 *
36@@ -153,6 +158,7 @@ struct omap_vdd_user_list {
37 * @user_list : the list head maintaining the various users.
38 * @scaling_mutex : the dvfs muutex.
39 * of this vdd with the voltage requested by each user.
40+ * @dev_list : list of devices bwlonging to this voltage domain.
41 * @curr_volt : current voltage for this vdd.
42 * @ocp_mod : The prm module for accessing the prm irqstatus reg.
43 * @prm_irqst_reg : prm irqstatus register.
44@@ -170,6 +176,7 @@ struct omap_vdd_info {
45 spinlock_t user_lock;
46 struct plist_head user_list;
47 struct mutex scaling_mutex;
48+ struct list_head dev_list;
49 u32 curr_volt;
50 u16 ocp_mod;
51 u8 prm_irqst_reg;
52@@ -1093,6 +1100,8 @@ static int __init omap4_vdd_data_configure(struct omap_vdd_info *vdd)
53 plist_head_init(&vdd->user_list, &vdd->user_lock);
54 /* Init the DVFS mutex */
55 mutex_init(&vdd->scaling_mutex);
56+ /* Init the device list */
57+ INIT_LIST_HEAD(&vdd->dev_list);
58
59 /* VC parameters */
60 vdd->vc_reg.prm_mod = OMAP4430_PRM_DEVICE_INST;
61@@ -1269,6 +1278,40 @@ int omap_voltage_add_request(struct voltagedomain *voltdm, struct device *dev,
62 return 0;
63 }
64
65+int omap_voltage_add_dev(struct voltagedomain *voltdm, struct device *dev)
66+{
67+ struct omap_vdd_info *vdd;
68+ struct omap_vdd_dev_list *temp_dev;
69+
70+ if (!voltdm || IS_ERR(voltdm)) {
71+ pr_warning("%s: VDD specified does not exist!\n", __func__);
72+ return -EINVAL;
73+ }
74+
75+ vdd = container_of(voltdm, struct omap_vdd_info, voltdm);
76+
77+ list_for_each_entry(temp_dev, &vdd->dev_list, node) {
78+ if (temp_dev->dev == dev) {
79+ dev_warn(dev, "%s: Device already added to vdee_%s\n",
80+ __func__, voltdm->name);
81+ return -EINVAL;
82+ }
83+ }
84+
85+ temp_dev = kzalloc(sizeof(struct omap_vdd_dev_list), GFP_KERNEL);
86+ if (!temp_dev) {
87+ dev_err(dev, "%s: Unable to creat a new device for vdd_%s\n",
88+ __func__, voltdm->name);
89+ return -ENOMEM;
90+ }
91+
92+ temp_dev->dev = dev;
93+
94+ list_add(&temp_dev->node, &vdd->dev_list);
95+
96+ return 0;
97+}
98+
99 /**
100 * omap_vp_enable() - API to enable a particular VP
101 * @voltdm: pointer to the VDD whose VP is to be enabled.
102@@ -1649,6 +1692,8 @@ int __init omap_voltage_late_init(void)
103 */
104 static int __init omap_voltage_early_init(void)
105 {
106+ int i;
107+
108 if (cpu_is_omap34xx()) {
109 vdd_info = omap3_vdd_info;
110 nr_scalable_vdd = OMAP3_NR_SCALABLE_VDD;
111@@ -1661,8 +1706,13 @@ static int __init omap_voltage_early_init(void)
112 vdd_data_configure = omap4_vdd_data_configure;
113 } else {
114 pr_warning("%s: voltage driver support not added\n", __func__);
115+ return -EINVAL;
116 }
117
118+ /* Init the device list */
119+ for (i = 0; i < nr_scalable_vdd; i++)
120+ INIT_LIST_HEAD(&(vdd_info[i].dev_list));
121+
122 return 0;
123 }
124 core_initcall(omap_voltage_early_init);
125diff --git a/arch/arm/plat-omap/include/plat/voltage.h b/arch/arm/plat-omap/include/plat/voltage.h
126index bd07eca..adbc6af 100644
127--- a/arch/arm/plat-omap/include/plat/voltage.h
128+++ b/arch/arm/plat-omap/include/plat/voltage.h
129@@ -134,7 +134,7 @@ void omap_change_voltscale_method(struct voltagedomain *voltdm,
130 int omap_voltage_late_init(void);
131 int omap_voltage_add_request(struct voltagedomain *voltdm, struct device *dev,
132 unsigned long *volt);
133-
134+int omap_voltage_add_dev(struct voltagedomain *voltdm, struct device *dev);
135 #else
136 static inline int omap_voltage_register_pmic(struct voltagedomain *voltdm,
137 struct omap_volt_pmic_info *pmic_info) {}
138@@ -149,6 +149,11 @@ static inline int omap_voltage_add_request(struct voltagedomain *voltdm,
139 {
140 return -EINVAL;
141 }
142+static inline int omap_voltage_add_dev(struct voltagedomain *voltdm,
143+ struct device *dev)
144+{
145+ return -EINVAL;
146+}
147 #endif
148
149 #endif
150diff --git a/arch/arm/plat-omap/omap_device.c b/arch/arm/plat-omap/omap_device.c
151index 57adb27..2c95e61 100644
152--- a/arch/arm/plat-omap/omap_device.c
153+++ b/arch/arm/plat-omap/omap_device.c
154@@ -86,6 +86,7 @@
155
156 #include <plat/omap_device.h>
157 #include <plat/omap_hwmod.h>
158+#include <plat/voltage.h>
159
160 /* These parameters are passed to _omap_device_{de,}activate() */
161 #define USE_WAKEUP_LAT 0
162@@ -481,6 +482,17 @@ struct omap_device *omap_device_build_ss(const char *pdev_name, int pdev_id,
163 for (i = 0; i < oh_cnt; i++) {
164 hwmods[i]->od = od;
165 _add_optional_clock_alias(od, hwmods[i]);
166+ if (hwmods[i]->vdd_name) {
167+ struct omap_hwmod *oh = hwmods[i];
168+ struct voltagedomain *voltdm;
169+
170+ if (is_early_device)
171+ continue;
172+
173+ voltdm = omap_voltage_domain_lookup(oh->vdd_name);
174+ if (!omap_voltage_add_dev(voltdm, &od->pdev.dev))
175+ oh->voltdm = voltdm;
176+ }
177 }
178
179 if (ret)
180--
1811.6.6.1
182
generated by cgit v1.2.3-54-g00ecf (git 2.39.0) at 2024-05-29 12:27:57 +0000