Patchwork [U-Boot,3/9,v9] EXYNOS5: FDT: Add TMU device node values

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Submitter Akshay Saraswat
Date Feb. 6, 2013, 1:18 p.m.
Message ID <1360156726-13315-4-git-send-email-akshay.s@samsung.com>
Download mbox | patch
Permalink /patch/218591/
State Superseded
Delegated to: Minkyu Kang
Headers show

Comments

Akshay Saraswat - Feb. 6, 2013, 1:18 p.m.
Fdt entry for Exynos TMU driver specific pre-defined values used for
calibration of current temperature and defining threshold values.

Signed-off-by: Akshay Saraswat <akshay.s@samsung.com>
Acked-by: Simon Glass <sjg@chromium.org>
---
Changes since v8:
	- None.

 arch/arm/dts/exynos5250.dtsi              |    5 ++++
 board/samsung/dts/exynos5250-smdk5250.dts |   12 ++++++++
 doc/device-tree-bindings/exynos/tmu.txt   |   46 +++++++++++++++++++++++++++++
 include/fdtdec.h                          |    1 +
 lib/fdtdec.c                              |    1 +
 5 files changed, 65 insertions(+)
 create mode 100644 doc/device-tree-bindings/exynos/tmu.txt

Patch

diff --git a/arch/arm/dts/exynos5250.dtsi b/arch/arm/dts/exynos5250.dtsi
index ed8c8dd..61d35a8 100644
--- a/arch/arm/dts/exynos5250.dtsi
+++ b/arch/arm/dts/exynos5250.dtsi
@@ -151,4 +151,9 @@ 
 		};
 	};
 
+	tmu@10060000 {
+		compatible = "samsung,exynos-tmu";
+		reg = <0x10060000 0x10000>;
+	};
+
 };
diff --git a/board/samsung/dts/exynos5250-smdk5250.dts b/board/samsung/dts/exynos5250-smdk5250.dts
index cbfab6f..00dac40 100644
--- a/board/samsung/dts/exynos5250-smdk5250.dts
+++ b/board/samsung/dts/exynos5250-smdk5250.dts
@@ -66,4 +66,16 @@ 
 			compatible = "maxim,max77686_pmic";
 		};
 	};
+
+	tmu@10060000 {
+		samsung,min-temp	= <25>;
+		samsung,max-temp	= <125>;
+		samsung,start-warning	= <95>;
+		samsung,start-tripping	= <105>;
+		samsung,efuse-min-value	= <40>;
+		samsung,efuse-value	= <55>;
+		samsung,efuse-max-value	= <100>;
+		samsung,slope		= <274761730>;
+		samsung,dc-value	= <25>;
+	};
 };
diff --git a/doc/device-tree-bindings/exynos/tmu.txt b/doc/device-tree-bindings/exynos/tmu.txt
new file mode 100644
index 0000000..b911a52
--- /dev/null
+++ b/doc/device-tree-bindings/exynos/tmu.txt
@@ -0,0 +1,46 @@ 
+Exynos Thermal management Unit
+
+The device node for TMU that is a part of Exynos5250
+SOC is as described in the document "Open Firmware Recommended
+Practice : Universal Serial Bus" with the following modifications
+and additions:
+
+Required properties:
+
+ - compatible : Should be "samsung,exynos-tmu" for TMU
+ - samsung,min-temp : Minimum temperature value (25 degree celsius)
+	- Current temperature of SoC should be more than this value.
+ - samsung,max-temp : Maximum temperature value (125 degree celsius)
+	- Current temperature of SoC should be less than this value.
+ - samsung,start-warning : Temperature at which TMU starts giving warning (degree celsius)
+ - samsung,start-tripping : Temperature at which system will trip and shutdown (degree celsius)
+ - samsung,efuse-min-value : SOC efuse min value (Constant 40)
+	- efuse-value should be more than this value.
+ - samsung,efuse-value : SOC actual efuse value (Literal value)
+	- This is the data trimming info.
+	- This value is used to calculate measuring error.
+ - samsung,efuse-max-value : SoC max efuse value (Constant 100)
+	- efuse-value should be less than this value.
+ - samsung,slope : Default value 274761730 (Constant 0x1060_8802).
+	- This is the default value for TMU_CONTROL register.
+	- It sets the gain of amplifier to the positive-tc generator block.
+	- It selects thermal tripping mode and enables thermal tripping.
+ - samsung,dc-value : Measured data calibration value (Constant 25)
+	- Used for tempearture calculation.
+	- This is 25 because temperature measured is always above 25 degrees.
+
+
+Example:
+
+tmu@10060000 {
+	compatible = "samsung,exynos-tmu"
+	samsung,min-temp = <25>;
+	samsung,max-temp = <125>;
+	samsung,start-warning = <95>;
+	samsung,start-tripping = <105>;
+	samsung,efuse-min-value = <40>;
+	samsung,efuse-value = <55>;
+	samsung,efuse-max-value = <100>;
+	samsung,slope = <274761730>;
+	samsung,dc-value = <25>;
+};
diff --git a/include/fdtdec.h b/include/fdtdec.h
index f77d195..058fb51 100644
--- a/include/fdtdec.h
+++ b/include/fdtdec.h
@@ -79,6 +79,7 @@  enum fdt_compat_id {
 	COMPAT_SAMSUNG_EXYNOS_EHCI,	/* Exynos EHCI controller */
 	COMPAT_SAMSUNG_EXYNOS_USB_PHY,	/* Exynos phy controller for usb2.0 */
 	COMPAT_MAXIM_MAX77686_PMIC,	/* MAX77686 PMIC */
+	COMPAT_SAMSUNG_EXYNOS_TMU,	/* Exynos TMU */
 
 	COMPAT_COUNT,
 };
diff --git a/lib/fdtdec.c b/lib/fdtdec.c
index 16921e1..4613fcd 100644
--- a/lib/fdtdec.c
+++ b/lib/fdtdec.c
@@ -54,6 +54,7 @@  static const char * const compat_names[COMPAT_COUNT] = {
 	COMPAT(SAMSUNG_EXYNOS_EHCI, "samsung,exynos-ehci"),
 	COMPAT(SAMSUNG_EXYNOS_USB_PHY, "samsung,exynos-usb-phy"),
 	COMPAT(MAXIM_MAX77686_PMIC, "maxim,max77686_pmic"),
+	COMPAT(SAMSUNG_EXYNOS_TMU, "samsung,exynos-tmu"),
 };
 
 const char *fdtdec_get_compatible(enum fdt_compat_id id)