Hi Naveen, On Thu, Aug 1, 2013 at 4:06 PM, Naveen Krishna Chatradhi <ch.naveen@xxxxxxxxxxx> wrote: > This patch adds code to handle the misplaced TRIMINFO register > incase of Exynos5420. > > On Exynos5420 we have a TRIMINFO register being misplaced for > TMU channels 2, 3 and 4 > > TRIMINFO at 0x1006c000 contains data for TMU channel 3 > TRIMINFO at 0x100a0000 contains data for TMU channel 4 > TRIMINFO at 0x10068000 contains data for TMU channel 2 > > The misplaced register address is passed through devicetree and > map it seperately during probe. > Also, adds the documentation under devicetree/bindings/thermal/ > > Signed-off-by: Naveen Krishna Chatradhi <ch.naveen@xxxxxxxxxxx> > Reviewed-by: Doug Anderson <dianders@xxxxxxxxxxxx> > --- > Changes since v1: > Rebased on http://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux-soc-thermal.git Is it rebased against next branch? > > .../devicetree/bindings/thermal/exynos-thermal.txt | 48 ++++++++++++++++++++ > drivers/thermal/exynos_thermal.c | 26 ++++++++++- In the new directory structure this file is renamed as drivers/thermal/samsung/exynos_tmu.c. Thanks, Amit Daniel > 2 files changed, 72 insertions(+), 2 deletions(-) > create mode 100644 Documentation/devicetree/bindings/thermal/exynos-thermal.txt > > diff --git a/Documentation/devicetree/bindings/thermal/exynos-thermal.txt b/Documentation/devicetree/bindings/thermal/exynos-thermal.txt > new file mode 100644 > index 0000000..1db279e > --- /dev/null > +++ b/Documentation/devicetree/bindings/thermal/exynos-thermal.txt > @@ -0,0 +1,48 @@ > +* Exynos Thermal > + > +Required properties: > +- compatible: should be one of the following. > + * "samsung,exynos4210-tmu" - for controllers compatible with exynos4210 tmu. > + * "samsung,exynos5250-tmu" - for controllers compatible with exynos5250 tmu. > + * "samsung,exynos5420-tmu" - for controllers compatible with exynos5420 tmu. > + > +- reg: physical base address of the controller and length of > + memory mapped region. > + > + ** NOTE FOR EXYNOS5420 ** > + TRIMINFO register is being misplaced for TMU channels 2, 3 and 4 > + > + TERMINFO for TMU channel 2 is present in address space of TMU channel 3 > + TERMINFO for TMU channel 3 is present in address space of TMU channel 4 > + TERMINFO for TMU channel 4 is present in address space of TMU channel 2 > + > + * In such cases the reg property contains the misplaced register address and > + range as the second parameter. > + > +- interrupts : interrupt number to the cpu. > +- clocks : Clock number as per common clock framework for the cpu. > +- clock-names : clock name to be used in the driver > + > +Example: > + > + /* tmu for CPU0 */ > + tmu@10060000 { > + compatible = "samsung,exynos5420-tmu"; > + reg = <0x10060000 0x100>; > + interrupts = <0 65 0>; > + clocks = <&clock 318>; > + clock-names = "tmu_apbif"; > + }; > + > +Example: In case of Exynos5420 TMU channel 3 > + > + /* tmu for CPU3 */ > + tmu@1006c000 { > + compatible = "samsung,exynos5420-tmu"; > + /* 2nd reg is for the misplaced TRIMINFO register */ > + reg = <0x1006c000 0x100>, <0x100a0000 0x4>; > + interrupts = <0 185 0>; > + clocks = <&clock 318>; > + clock-names = "tmu_apbif"; > + }; > + > diff --git a/drivers/thermal/exynos_thermal.c b/drivers/thermal/exynos_thermal.c > index d20ce9e..1ad9005 100644 > --- a/drivers/thermal/exynos_thermal.c > +++ b/drivers/thermal/exynos_thermal.c > @@ -38,6 +38,7 @@ > #include <linux/cpufreq.h> > #include <linux/cpu_cooling.h> > #include <linux/of.h> > +#include <linux/of_address.h> > > /* Exynos generic registers */ > #define EXYNOS_TMU_REG_TRIMINFO 0x0 > @@ -120,7 +121,7 @@ > struct exynos_tmu_data { > struct exynos_tmu_platform_data *pdata; > struct resource *mem; > - void __iomem *base; > + void __iomem *base, *triminfo_base; > int irq; > enum soc_type soc; > struct work_struct irq_work; > @@ -593,8 +594,14 @@ static int exynos_tmu_initialize(struct platform_device *pdev) > __raw_writel(EXYNOS_TRIMINFO_RELOAD, > data->base + EXYNOS_TMU_TRIMINFO_CON); > } > + > /* Save trimming info in order to perform calibration */ > - trim_info = readl(data->base + EXYNOS_TMU_REG_TRIMINFO); > + if (data->triminfo_base) > + /* On exynos5420 TRIMINFO is misplaced for some channels */ > + trim_info = readl(data->triminfo_base); > + else > + trim_info = readl(data->base + EXYNOS_TMU_REG_TRIMINFO); > + > data->temp_error1 = trim_info & EXYNOS_TMU_TRIM_TEMP_MASK; > data->temp_error2 = ((trim_info >> 8) & EXYNOS_TMU_TRIM_TEMP_MASK); > > @@ -941,6 +948,15 @@ static int exynos_tmu_probe(struct platform_device *pdev) > return ret; > } > > + /* For Exynos5420 The misplaced TERMINFO register address will be > + * passed from device tree node. > + * > + * We cannot use devm_request_and_ioremap, as the base address > + * over laps with the address space of the other TMU channel. > + * Check Documentation for details > + */ > + data->triminfo_base = of_iomap(pdev->dev.of_node, 1); > + > data->clk = devm_clk_get(&pdev->dev, "tmu_apbif"); > if (IS_ERR(data->clk)) { > dev_err(&pdev->dev, "Failed to get clock\n"); > @@ -1001,6 +1017,9 @@ static int exynos_tmu_probe(struct platform_device *pdev) > > return 0; > err_clk: > + if (data->triminfo_base) > + iounmap(data->triminfo_base); > + > platform_set_drvdata(pdev, NULL); > clk_unprepare(data->clk); > return ret; > @@ -1014,6 +1033,9 @@ static int exynos_tmu_remove(struct platform_device *pdev) > > exynos_unregister_thermal(); > > + if (data->triminfo_base) > + iounmap(data->triminfo_base); > + > clk_unprepare(data->clk); > > platform_set_drvdata(pdev, NULL); > -- > 1.7.9.5 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-pm" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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