Hi Tomasz, On 03/18/2014 08:13 PM, Tomasz Figa wrote: > Hi Chanwoo, > > On 17.03.2014 06:59, Chanwoo Choi wrote: >> Hi Tomasz, >> >> On 03/17/2014 11:51 AM, Chanwoo Choi wrote: >>> Hi Tomasz, >>> >>> On 03/15/2014 02:42 AM, Tomasz Figa wrote: >>>> Hi Chanwoo, >>>> >>>> On 13.03.2014 09:17, Chanwoo Choi wrote: >>>>> There are not the clock controller of ppmudmc0/1. This patch control the clock >>>>> of ppmudmc0/1 which is used for monitoring memory bus utilization. >>>>> >>>>> Also, this patch code clean about regulator control and free resource >>>>> when calling exit/remove function. >>>>> >>>>> For example, >>>>> busfreq@106A0000 { >>>>> compatible = "samsung,exynos4x12-busfreq"; >>>>> >>>>> /* Clock for PPMUDMC0/1 */ >>>>> clocks = <&clock CLK_PPMUDMC0>, <&clock CLK_PPMUDMC1>; >>>>> clock-names = "ppmudmc0", "ppmudmc1"; >>>>> >>>>> /* Regulator for MIF/INT block */ >>>>> vdd_mif-supply = <&buck1_reg>; >>>>> vdd_int-supply = <&buck3_reg>; >>>>> }; >>>>> >>>>> Signed-off-by: Chanwoo Choi <cw00.choi@xxxxxxxxxxx> >> >> I modify this patch according your comment as following: >> >> Best Regards, >> Chanwoo Choi >> >>> From c8f2fbc4c1166ec02fb2ad46164bc7ed9118721b Mon Sep 17 00:00:00 2001 >> From: Chanwoo Choi <cw00.choi@xxxxxxxxxxx> >> Date: Fri, 14 Mar 2014 12:05:54 +0900 >> Subject: [PATCH] devfreq: exynos4: Add ppmu's clock control and code clean >> about regulator control >> >> There are not the clock controller of ppmudmc0/1. This patch control the clock >> of ppmudmc0/1 which is used for monitoring memory bus utilization. >> >> Also, this patch code clean about regulator control and free resource >> when calling exit/remove function. >> >> For example, >> busfreq@106A0000 { >> compatible = "samsung,exynos4x12-busfreq"; >> >> /* Clock for PPMUDMC0/1 */ >> clocks = <&clock CLK_PPMUDMC0>, <&clock CLK_PPMUDMC1>; >> clock-names = "ppmudmc0", "ppmudmc1"; >> >> /* Regulator for MIF/INT block */ >> vdd_mif-supply = <&buck1_reg>; >> vdd_int-supply = <&buck3_reg>; >> }; >> >> Signed-off-by: Chanwoo Choi <cw00.choi@xxxxxxxxxxx> >> --- >> drivers/devfreq/exynos/exynos4_bus.c | 97 +++++++++++++++++++++++++++++++----- >> 1 file changed, 84 insertions(+), 13 deletions(-) >> >> diff --git a/drivers/devfreq/exynos/exynos4_bus.c b/drivers/devfreq/exynos/exynos4_bus.c >> index 4c630fb..3956bcc 100644 >> --- a/drivers/devfreq/exynos/exynos4_bus.c >> +++ b/drivers/devfreq/exynos/exynos4_bus.c >> @@ -62,6 +62,11 @@ enum exynos_ppmu_idx { >> PPMU_END, >> }; >> >> +static const char *exynos_ppmu_clk_name[] = { >> + [PPMU_DMC0] = "ppmudmc0", >> + [PPMU_DMC1] = "ppmudmc1", >> +}; >> + >> #define EX4210_LV_MAX LV_2 >> #define EX4x12_LV_MAX LV_4 >> #define EX4210_LV_NUM (LV_2 + 1) >> @@ -86,6 +91,7 @@ struct busfreq_data { >> struct regulator *vdd_mif; /* Exynos4412/4212 only */ >> struct busfreq_opp_info curr_oppinfo; >> struct exynos_ppmu ppmu[PPMU_END]; >> + struct clk *clk_ppmu[PPMU_END]; >> >> struct notifier_block pm_notifier; >> struct mutex lock; >> @@ -724,6 +730,17 @@ static void exynos4_bus_exit(struct device *dev) >> struct busfreq_data *data = dev_get_drvdata(dev); >> int i; >> >> + /* >> + * Un-map memory map and disable regulator/clocks >> + * to prevent power leakage. >> + */ >> + regulator_disable(data->vdd_int); >> + if (data->type == TYPE_BUSF_EXYNOS4x12) >> + regulator_disable(data->vdd_mif); >> + >> + for (i = 0; i < PPMU_END; i++) >> + clk_disable_unprepare(data->clk_ppmu[i]); >> + >> for (i = 0; i < PPMU_END; i++) >> iounmap(data->ppmu[i].hw_base); >> } >> @@ -989,6 +1006,7 @@ static int exynos4_busfreq_parse_dt(struct busfreq_data *data) >> { >> struct device *dev = data->dev; >> struct device_node *np = dev->of_node; >> + const char **clk_name = exynos_ppmu_clk_name; >> int i, ret = 0; >> >> if (!np) { >> @@ -1006,8 +1024,67 @@ static int exynos4_busfreq_parse_dt(struct busfreq_data *data) >> } >> } >> >> + for (i = 0; i < PPMU_END; i++) { >> + data->clk_ppmu[i] = devm_clk_get(dev, clk_name[i]); >> + if (IS_ERR(data->clk_ppmu[i])) { >> + dev_warn(dev, "Failed to get %s clock\n", clk_name[i]); > > dev_err() since this is an error. OK, I'll fix it. > >> + goto err_clocks; >> + } >> + >> + ret = clk_prepare_enable(data->clk_ppmu[i]); >> + if (ret < 0) { >> + dev_warn(dev, "Failed to enable %s clock\n", clk_name[i]); > > Ditto. OK, I'll fix it. > >> + data->clk_ppmu[i] = NULL; >> + goto err_clocks; >> + } >> + } >> + >> + /* Get regulator to control voltage of int block */ >> + data->vdd_int = devm_regulator_get(dev, "vdd_int"); >> + if (IS_ERR(data->vdd_int)) { >> + dev_err(dev, "Failed to get the regulator of vdd_int\n"); >> + ret = PTR_ERR(data->vdd_int); >> + goto err_clocks; >> + } >> + ret = regulator_enable(data->vdd_int); >> + if (ret < 0) { >> + dev_err(dev, "Failed to enable regulator of vdd_int\n"); >> + goto err_clocks; >> + } >> + >> + switch (data->type) { >> + case TYPE_BUSF_EXYNOS4210: >> + break; > > Do you need to use switch here? Wouldn't a simple if (data->type == TYPE_BUSF_EXYNOS4x12) work as well, resulting with simpler code? OK, I'll fix it. > > However I would expect this code to be completely removed, after defining DT bindings in a way allowing you to completely drop such SoC type enums. Please see my other reply for explanation of Exynos power plane DT bindings concept. OK, I agree your suggestion about Exynos power plane DT bindings concept. I'll apply "Exynos power plane" to exynos4 busfreq driver on next step after defining Exynos power plane DT bindings. > >> + case TYPE_BUSF_EXYNOS4x12: >> + /* Get regulator to control voltage of mif blk if Exynos4x12 */ >> + data->vdd_mif = devm_regulator_get(dev, "vdd_mif"); >> + if (IS_ERR(data->vdd_mif)) { >> + dev_err(dev, "Failed to get the regulator vdd_mif\n"); >> + ret = PTR_ERR(data->vdd_mif); >> + goto err_regulator; >> + } >> + ret = regulator_enable(data->vdd_mif); >> + if (ret < 0) { >> + dev_err(dev, "Failed to enable regulator of vdd_mif\n"); >> + goto err_regulator; >> + } >> + break; >> + default: >> + dev_err(dev, "Unknown device type : %d\n", data->type); >> + return -EINVAL; >> + }; >> + >> return 0; >> >> +err_regulator: >> + regulator_disable(data->vdd_int); >> +err_clocks: >> + for (i = 0; i < PPMU_END; i++) { >> + if (IS_ERR(data->clk_ppmu[i])) >> + continue; >> + else > > if (!IS_ERR(...)) > >> + clk_disable_unprepare(data->clk_ppmu[i]); >> + } > > Otherwise looks good. Thanks for your review. Best Regards, Chanwoo Choi -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html