[PATCH v6 5/5] rockchip/soc/drivers: Add DTPM description for rk3399

From: Daniel Lezcano
Date: Wed Jan 19 2022 - 03:58:33 EST


The DTPM framework does support now the hierarchy description.

The platform specific code can call the hierarchy creation function
with an array of struct dtpm_node pointing to their parent.

This patch provides a description of the big / Little CPUs and the
GPU and tie them together under a virtual 'package' name. Only rk3399 is
described now.

The description could be extended in the future with the memory
controller with devfreq.

The description is always a module and it describes the soft
dependencies. The userspace has to load the softdeps module in the
right order.

Signed-off-by: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
---
drivers/soc/rockchip/Kconfig | 8 +++++
drivers/soc/rockchip/Makefile | 1 +
drivers/soc/rockchip/dtpm.c | 59 +++++++++++++++++++++++++++++++++++
3 files changed, 68 insertions(+)
create mode 100644 drivers/soc/rockchip/dtpm.c

diff --git a/drivers/soc/rockchip/Kconfig b/drivers/soc/rockchip/Kconfig
index 25eb2c1e31bb..6dc017f02431 100644
--- a/drivers/soc/rockchip/Kconfig
+++ b/drivers/soc/rockchip/Kconfig
@@ -34,4 +34,12 @@ config ROCKCHIP_PM_DOMAINS

If unsure, say N.

+config ROCKCHIP_DTPM
+ tristate "Rockchip DTPM hierarchy"
+ depends on DTPM && DRM_PANFROST && m
+ help
+ Describe the hierarchy for the Dynamic Thermal Power
+ Management tree on this platform. That will create all the
+ power capping capable devices.
+
endif
diff --git a/drivers/soc/rockchip/Makefile b/drivers/soc/rockchip/Makefile
index 875032f7344e..05f31a4e743c 100644
--- a/drivers/soc/rockchip/Makefile
+++ b/drivers/soc/rockchip/Makefile
@@ -5,3 +5,4 @@
obj-$(CONFIG_ROCKCHIP_GRF) += grf.o
obj-$(CONFIG_ROCKCHIP_IODOMAIN) += io-domain.o
obj-$(CONFIG_ROCKCHIP_PM_DOMAINS) += pm_domains.o
+obj-$(CONFIG_ROCKCHIP_DTPM) += dtpm.o
diff --git a/drivers/soc/rockchip/dtpm.c b/drivers/soc/rockchip/dtpm.c
new file mode 100644
index 000000000000..0b73a9cba954
--- /dev/null
+++ b/drivers/soc/rockchip/dtpm.c
@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright 2021 Linaro Limited
+ *
+ * Author: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
+ *
+ * DTPM hierarchy description
+ */
+#include <linux/dtpm.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+
+static struct dtpm_node __initdata rk3399_hierarchy[] = {
+ [0]{ .name = "rk3399",
+ .type = DTPM_NODE_VIRTUAL },
+ [1]{ .name = "package",
+ .type = DTPM_NODE_VIRTUAL,
+ .parent = &rk3399_hierarchy[0] },
+ [2]{ .name = "/cpus/cpu@0",
+ .type = DTPM_NODE_DT,
+ .parent = &rk3399_hierarchy[1] },
+ [3]{ .name = "/cpus/cpu@1",
+ .type = DTPM_NODE_DT,
+ .parent = &rk3399_hierarchy[1] },
+ [4]{ .name = "/cpus/cpu@2",
+ .type = DTPM_NODE_DT,
+ .parent = &rk3399_hierarchy[1] },
+ [5]{ .name = "/cpus/cpu@3",
+ .type = DTPM_NODE_DT,
+ .parent = &rk3399_hierarchy[1] },
+ [6]{ .name = "/cpus/cpu@100",
+ .type = DTPM_NODE_DT,
+ .parent = &rk3399_hierarchy[1] },
+ [7]{ .name = "/cpus/cpu@101",
+ .type = DTPM_NODE_DT,
+ .parent = &rk3399_hierarchy[1] },
+ [8]{ .name = "/gpu@ff9a0000",
+ .type = DTPM_NODE_DT,
+ .parent = &rk3399_hierarchy[1] },
+ [9]{ },
+};
+
+static struct of_device_id __initdata rockchip_dtpm_match_table[] = {
+ { .compatible = "rockchip,rk3399", .data = rk3399_hierarchy },
+ {},
+};
+
+static int __init rockchip_dtpm_init(void)
+{
+ return dtpm_create_hierarchy(rockchip_dtpm_match_table);
+}
+module_init(rockchip_dtpm_init);
+
+MODULE_SOFTDEP("pre: panfrost cpufreq-dt");
+MODULE_DESCRIPTION("Rockchip DTPM driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:dtpm");
+MODULE_AUTHOR("Daniel Lezcano <daniel.lezcano@xxxxxxxxxx");
--
2.25.1