On Wed, Oct 22, 2014 at 5:28 PM, Ulf Hansson [off-list ref] wrote:

On 22 October 2014 17:09, Geert Uytterhoeven [off-list ref] wrote:

quoted

On Wed, Oct 22, 2014 at 5:01 PM, Ulf Hansson [off-list ref] wrote:

quoted

quoted

quoted

quoted

+void keystone_pm_domain_attach_dev(struct device *dev)
  {
+    struct clk *clk;
      int ret;
+    int i = 0;

      dev_dbg(dev, "%s\n", __func__);

-    ret = pm_generic_runtime_suspend(dev);
-    if (ret)
-        return ret;
-
-    ret = pm_clk_suspend(dev);
+    ret = pm_clk_create(dev);
      if (ret) {
-        pm_generic_runtime_resume(dev);
-        return ret;
+        dev_err(dev, "pm_clk_create failed %d\n", ret);
+        return;
+    };
+
+    while ((clk = of_clk_get(dev->of_node, i++)) && !IS_ERR(clk)) {
+        ret = pm_clk_add_clk(dev, clk);
+        if (ret) {
+            dev_err(dev, "pm_clk_add_clk failed %d\n", ret);
+            goto clk_err;
+        };
      }

-    return 0;
+    if (!IS_ENABLED(CONFIG_PM_RUNTIME)) {

Can we not okkup two seperate callbacks instead of above check ?
I don't like this CONFIG check here. Its slightly better version of
ifdef in middle of the code.

I've found more-less similar comment on patch
"Re: [PATCH v3 1/3] power-domain: add power domain drivers for Rockchip platform"
https://lkml.org/lkml/2014/10/17/257

So, Would you like me to create patch which will enable clocks in pm_clk_add/_clk()
in case !IS_ENABLED(CONFIG_PM_RUNTIME)

I am wondering whether we actually should/could do this, no matter of
CONFIG_PM_RUNTIME.

Typically, for configurations that uses CONFIG_PM_RUNTIME, the PM
clocks through pm_clk_suspend(), will be gated once the device becomes
runtime PM suspended. Right?

Doing it unconditionally means we'll have lots of unneeded clocks running
for a short while.

As long as the pm_clk_add() is being invoked from the ->attach_dev()
callback, we are in the probe path. Certainly we would like to have
clocks enabled while probing, don't you think?

If we wouldn't enable the clocks for CONFIG_PM_RUNTIME, when will
those be enabled?

They will be enabled when the driver does

        pm_runtime_enable(dev);
        pm_runtime_get_sync(dev);

in its .probe() method.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds