clk: shmobile: Add CPG/MSTP Clock Domain support

Add Clock Domain support to the Clock Pulse Generator (CPG) Module Stop
(MSTP) Clocks driver using the generic PM Domain.  This allows to
power-manage the module clocks of SoC devices that are part of the
CPG/MSTP Clock Domain using Runtime PM, or for system suspend/resume.

SoC devices that are part of the CPG/MSTP Clock Domain and can be
power-managed through an MSTP clock should be tagged in DT with a
proper "power-domains" property.

The CPG/MSTP Clock Domain code will scan such devices for clocks that
are suitable for power-managing the device, by looking for a clock that
is compatible with "renesas,cpg-mstp-clocks".

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Stephen Boyd <sboyd@codeaurora.org>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Kevin Hilman <khilman@linaro.org>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

diff --git a/drivers/clk/shmobile/clk-mstp.c b/drivers/clk/shmobile/clk-mstp.c
index 2d2fe773ac8168f9f458f0c681b33937738943b4..b1df7b2f1e970adbc0214bd6e8af68cbfca7897c 100644 (file)
--- a/drivers/clk/shmobile/clk-mstp.c
+++ b/drivers/clk/shmobile/clk-mstp.c
@@ -2,6 +2,7 @@
  * R-Car MSTP clocks
  *
  * Copyright (C) 2013 Ideas On Board SPRL
+ * Copyright (C) 2015 Glider bvba
  *
  * Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
  *
@@ -10,11 +11,16 @@
  * the Free Software Foundation; version 2 of the License.
  */
 
+#include <linux/clk.h>
 #include <linux/clk-provider.h>
 #include <linux/clkdev.h>
+#include <linux/clk/shmobile.h>
+#include <linux/device.h>
 #include <linux/io.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
+#include <linux/pm_clock.h>
+#include <linux/pm_domain.h>
 #include <linux/spinlock.h>
 
 /*
@@ -236,3 +242,84 @@ static void __init cpg_mstp_clocks_init(struct device_node *np)
        of_clk_add_provider(np, of_clk_src_onecell_get, &group->data);
 }
 CLK_OF_DECLARE(cpg_mstp_clks, "renesas,cpg-mstp-clocks", cpg_mstp_clocks_init);
+
+
+#ifdef CONFIG_PM_GENERIC_DOMAINS_OF
+int cpg_mstp_attach_dev(struct generic_pm_domain *domain, struct device *dev)
+{
+       struct device_node *np = dev->of_node;
+       struct of_phandle_args clkspec;
+       struct clk *clk;
+       int i = 0;
+       int error;
+
+       while (!of_parse_phandle_with_args(np, "clocks", "#clock-cells", i,
+                                          &clkspec)) {
+               if (of_device_is_compatible(clkspec.np,
+                                           "renesas,cpg-mstp-clocks"))
+                       goto found;
+
+               of_node_put(clkspec.np);
+               i++;
+       }
+
+       return 0;
+
+found:
+       clk = of_clk_get_from_provider(&clkspec);
+       of_node_put(clkspec.np);
+
+       if (IS_ERR(clk))
+               return PTR_ERR(clk);
+
+       error = pm_clk_create(dev);
+       if (error) {
+               dev_err(dev, "pm_clk_create failed %d\n", error);
+               goto fail_put;
+       }
+
+       error = pm_clk_add_clk(dev, clk);
+       if (error) {
+               dev_err(dev, "pm_clk_add_clk %pC failed %d\n", clk, error);
+               goto fail_destroy;
+       }
+
+       return 0;
+
+fail_destroy:
+       pm_clk_destroy(dev);
+fail_put:
+       clk_put(clk);
+       return error;
+}
+
+void cpg_mstp_detach_dev(struct generic_pm_domain *domain, struct device *dev)
+{
+       if (!list_empty(&dev->power.subsys_data->clock_list))
+               pm_clk_destroy(dev);
+}
+
+void __init cpg_mstp_add_clk_domain(struct device_node *np)
+{
+       struct generic_pm_domain *pd;
+       u32 ncells;
+
+       if (of_property_read_u32(np, "#power-domain-cells", &ncells)) {
+               pr_warn("%s lacks #power-domain-cells\n", np->full_name);
+               return;
+       }
+
+       pd = kzalloc(sizeof(*pd), GFP_KERNEL);
+       if (!pd)
+               return;
+
+       pd->name = np->name;
+
+       pd->flags = GENPD_FLAG_PM_CLK;
+       pm_genpd_init(pd, &simple_qos_governor, false);
+       pd->attach_dev = cpg_mstp_attach_dev;
+       pd->detach_dev = cpg_mstp_detach_dev;
+
+       of_genpd_add_provider_simple(np, pd);
+}
+#endif /* !CONFIG_PM_GENERIC_DOMAINS_OF */

diff --git a/include/linux/clk/shmobile.h b/include/linux/clk/shmobile.h
index 63a8159c4e64153da9ab10e742dbac2e4ed232ab..cb19cc1865ca5cfb9b329725f9bbb3935fd084cc 100644 (file)
--- a/include/linux/clk/shmobile.h
+++ b/include/linux/clk/shmobile.h
@@ -16,8 +16,20 @@
 
 #include <linux/types.h>
 
+struct device;
+struct device_node;
+struct generic_pm_domain;
+
 void r8a7778_clocks_init(u32 mode);
 void r8a7779_clocks_init(u32 mode);
 void rcar_gen2_clocks_init(u32 mode);
 
+#ifdef CONFIG_PM_GENERIC_DOMAINS_OF
+void cpg_mstp_add_clk_domain(struct device_node *np);
+int cpg_mstp_attach_dev(struct generic_pm_domain *domain, struct device *dev);
+void cpg_mstp_detach_dev(struct generic_pm_domain *domain, struct device *dev);
+#else
+static inline void cpg_mstp_add_clk_domain(struct device_node *np) {}
+#endif
+
 #endif