Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux-soc-thermal

Pull more thermal managament updates from Zhang Rui:
 "Specifics:

   - Exynos thermal driver refactoring.  Several cleanups, code
     optimization, unused symbols removal, and unused feature removal in
     Exynos thermal driver.  Thanks Lukasz for this effort.

   - Exynos thermal driver support to OF thermal.  After the code
     refactoring, the driver earned the support to OF thermal.  Chip
     thermal data were moved from driver code to DTS, reducing the code
     footprint.  Thanks Lukasz for this.

   - After receiving the OF thermal support, the exynos thermal driver
     now must allow modular build.  Thanks Arnd for detecting, reporting
     and fixing this.

   - Exynos thermal driver support to Exynos 7 SoC.  Thanks Abhilash for
     this.

   - Accurate temperature reporting on Rockchip thermal driver, thanks
     to Caesar.

   - Fix on how OF thermal enables its zones, thanks Lukasz for fixing.

   - Fixes in OF thermal examples under Documentation/.  Thanks Srinivas
     for fixing"

* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux-soc-thermal:
  thermal: exynos: Add TMU support for Exynos7 SoC
  dts: Documentation: Add documentation for Exynos7 SoC thermal bindings
  cpufreq: exynos: allow modular build
  thermal: Fix examples in DT documentation
  thermal: exynos: Correct sanity check at exynos_report_trigger() function
  thermal: Kconfig: Remove config for not used EXYNOS_THERMAL_CORE
  thermal: exynos: Remove exynos_tmu_data.c file
  thermal: rockchip: make temperature reporting much more accurate
  thermal: exynos: Remove exynos_thermal_common.[c|h] files
  thermal: samsung: core: Exynos TMU rework to use device tree for configuration
  dts: Documentation: Update exynos-thermal.txt example for Exynos5440
  dts: Documentation: Extending documentation entry for exynos-thermal
  cpufreq: exynos: Use device tree to determine if cpufreq cooling should be registered
  thermal: exynos: Modify exynos thermal code to use device tree for cpu cooling configuration
  thermal: exynos: Provide thermal_exynos.h file to be included in device tree files
  thermal: exynos: cosmetic: Correct comment format
  thermal: of: Enable thermal_zoneX when sensor is correctly added

1 files changed, 23 insertions, 13 deletions

diff --git a/drivers/thermal/rockchip_thermal.c b/drivers/thermal/rockchip_thermal.c
index 9c6ce54..3aa46ac 100644
--- a/drivers/thermal/rockchip_thermal.c
+++ b/drivers/thermal/rockchip_thermal.c
@@ -193,19 +193,20 @@ static u32 rk_tsadcv2_temp_to_code(long temp)
 
 static long rk_tsadcv2_code_to_temp(u32 code)
 {
-	int high, low, mid;
-
-	low = 0;
-	high = ARRAY_SIZE(v2_code_table) - 1;
-	mid = (high + low) / 2;
-
-	if (code > v2_code_table[low].code || code < v2_code_table[high].code)
-		return 125000; /* No code available, return max temperature */
+	unsigned int low = 0;
+	unsigned int high = ARRAY_SIZE(v2_code_table) - 1;
+	unsigned int mid = (low + high) / 2;
+	unsigned int num;
+	unsigned long denom;
+
+	/* Invalid code, return -EAGAIN */
+	if (code > TSADCV2_DATA_MASK)
+		return -EAGAIN;
 
-	while (low <= high) {
-		if (code >= v2_code_table[mid].code && code <
-		    v2_code_table[mid - 1].code)
-			return v2_code_table[mid].temp;
+	while (low <= high && mid) {
+		if (code >= v2_code_table[mid].code &&
+		    code < v2_code_table[mid - 1].code)
+			break;
 		else if (code < v2_code_table[mid].code)
 			low = mid + 1;
 		else
@@ -213,7 +214,16 @@ static long rk_tsadcv2_code_to_temp(u32 code)
 		mid = (low + high) / 2;
 	}
 
-	return 125000;
+	/*
+	 * The 5C granularity provided by the table is too much. Let's
+	 * assume that the relationship between sensor readings and
+	 * temperature between 2 table entries is linear and interpolate
+	 * to produce less granular result.
+	 */
+	num = v2_code_table[mid].temp - v2_code_table[mid - 1].temp;
+	num *= v2_code_table[mid - 1].code - code;
+	denom = v2_code_table[mid - 1].code - v2_code_table[mid].code;
+	return v2_code_table[mid - 1].temp + (num / denom);
 }
 
 /**