Re: [PATCHv2 3/8] devfreq: exynos4: Add ppmu's clock control and code clean about regulator control
From: Tomasz Figa
Date: Tue Mar 18 2014 - 07:14:50 EST
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.
+ 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.
+ 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?
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.
+ 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.
Best regards,
Tomasz
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