[PATCH v6 4/6] soc: qcom: Extend RPMh power controller driver to register warming devices.

[Thara Gopinath]

RPMh power control hosts power domains that can be used as
thermal warming devices. Register these power domains
with the generic power domain warming device thermal framework.

Signed-off-by: Thara Gopinath <thara.gopin...@linaro.org>
---

v3->v4:
        - Introduce a boolean value is_warming_dev in rpmhpd structure to
          indicate if a generic power domain can be used as a warming
          device or not.With this change, device tree no longer has to
          specify which power domain inside the rpmh power domain provider
          is a warming device.
        - Move registering of warming devices into a late initcall to
          ensure that warming devices are registered after thermal
          framework is initialized.

v5->v6:
        - Moved back registering of warming devices into probe since
          Bjorn pointed out that now the driver can be initialized as
          as a module, late_initcall will not work. Thermal framework
          takes care of binding a cooling device to a thermal zone even
          if the cooling device is registered before the thermal framework
          is initialized.

 drivers/soc/qcom/rpmhpd.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/soc/qcom/rpmhpd.c b/drivers/soc/qcom/rpmhpd.c
index a9c597143525..29e1eb4d11af 100644
--- a/drivers/soc/qcom/rpmhpd.c
+++ b/drivers/soc/qcom/rpmhpd.c
@@ -12,6 +12,7 @@
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/pm_opp.h>
+#include <linux/pd_warming.h>
 #include <soc/qcom/cmd-db.h>
 #include <soc/qcom/rpmh.h>
 #include <dt-bindings/power/qcom-rpmpd.h>
@@ -49,6 +50,7 @@ struct rpmhpd {
        bool            enabled;
        const char      *res_name;
        u32             addr;
+       bool            is_warming_dev;
 };
 
 struct rpmhpd_desc {
@@ -90,6 +92,7 @@ static struct rpmhpd sdm845_mx = {
        .pd = { .name = "mx", },
        .peer = &sdm845_mx_ao,
        .res_name = "mx.lvl",
+       .is_warming_dev = true,
 };
 
 static struct rpmhpd sdm845_mx_ao = {
@@ -472,7 +475,19 @@ static int rpmhpd_probe(struct platform_device *pdev)
                                               &rpmhpds[i]->pd);
        }
 
-       return of_genpd_add_provider_onecell(pdev->dev.of_node, data);
+       ret = of_genpd_add_provider_onecell(pdev->dev.of_node, data);
+
+       if (ret)
+               return ret;
+
+       if (!of_find_property(dev->of_node, "#cooling-cells", NULL))
+               return 0;
+
+       for (i = 0; i < num_pds; i++)
+               if (rpmhpds[i]->is_warming_dev)
+                       of_pd_warming_register(rpmhpds[i]->dev, i);
+
+       return 0;
 }
 
 static struct platform_driver rpmhpd_driver = {
-- 
2.20.1