[PATCH 8/9] clk: davinci: psc: allow for dev == NULL

David Lechner
2018-05-25T18:12:18Z

On some davinci SoCs, we need to register the PSC clocks during early
boot because they are needed for clocksource/clockevent. These changes
allow for dev == NULL because in this case, we won't have a platform
device for the clocks.

Signed-off-by: David Lechner <david@lechnology.com>
Reviewed-by: Sekhar Nori <nsekhar@ti.com>
---
drivers/clk/davinci/psc-dm355.c | 3 +-
drivers/clk/davinci/psc-dm365.c | 3 +-
drivers/clk/davinci/psc-dm644x.c | 3 +-
drivers/clk/davinci/psc-dm646x.c | 3 +-
drivers/clk/davinci/psc.c | 58 ++++++++++++++++++++++++--------
include/linux/clk/davinci.h | 5 +++
6 files changed, 57 insertions(+), 18 deletions(-)

diff --git a/drivers/clk/davinci/psc-dm355.c b/drivers/clk/davinci/psc-dm355.c
index 128e7345b20c..ddd250107c4e 100644
--- a/drivers/clk/davinci/psc-dm355.c
+++ b/drivers/clk/davinci/psc-dm355.c
@@ -6,6 +6,7 @@
*/

#include <linux/clk-provider.h>
+#include <linux/clk/davinci.h>
#include <linux/clk.h>
#include <linux/clkdev.h>
#include <linux/init.h>
@@ -68,7 +69,7 @@ static const struct davinci_lpsc_clk_info dm355_psc_info[] = {
{ }
};

-static int dm355_psc_init(struct device *dev, void __iomem *base)
+int dm355_psc_init(struct device *dev, void __iomem *base)
{
return davinci_psc_register_clocks(dev, dm355_psc_info, 42, base);
}
diff --git a/drivers/clk/davinci/psc-dm365.c b/drivers/clk/davinci/psc-dm365.c
index 289af3913fb0..8c73086cc676 100644
--- a/drivers/clk/davinci/psc-dm365.c
+++ b/drivers/clk/davinci/psc-dm365.c
@@ -6,6 +6,7 @@
*/

#include <linux/clk-provider.h>
+#include <linux/clk/davinci.h>
#include <linux/clk.h>
#include <linux/clkdev.h>
#include <linux/init.h>
@@ -86,7 +87,7 @@ static const struct davinci_lpsc_clk_info dm365_psc_info[] = {
{ }
};

-static int dm365_psc_init(struct device *dev, void __iomem *base)
+int dm365_psc_init(struct device *dev, void __iomem *base)
{
return davinci_psc_register_clocks(dev, dm365_psc_info, 52, base);
}
diff --git a/drivers/clk/davinci/psc-dm644x.c b/drivers/clk/davinci/psc-dm644x.c
index c22367baa46f..fc0230e3a3d6 100644
--- a/drivers/clk/davinci/psc-dm644x.c
+++ b/drivers/clk/davinci/psc-dm644x.c
@@ -6,6 +6,7 @@
*/

#include <linux/clk-provider.h>
+#include <linux/clk/davinci.h>
#include <linux/clk.h>
#include <linux/clkdev.h>
#include <linux/init.h>
@@ -63,7 +64,7 @@ static const struct davinci_lpsc_clk_info dm644x_psc_info[] = {
{ }
};

-static int dm644x_psc_init(struct device *dev, void __iomem *base)
+int dm644x_psc_init(struct device *dev, void __iomem *base)
{
return davinci_psc_register_clocks(dev, dm644x_psc_info, 41, base);
}
diff --git a/drivers/clk/davinci/psc-dm646x.c b/drivers/clk/davinci/psc-dm646x.c
index 468ef86ea40b..c3f82ed70a80 100644
--- a/drivers/clk/davinci/psc-dm646x.c
+++ b/drivers/clk/davinci/psc-dm646x.c
@@ -6,6 +6,7 @@
*/

#include <linux/clk-provider.h>
+#include <linux/clk/davinci.h>
#include <linux/clk.h>
#include <linux/clkdev.h>
#include <linux/init.h>
@@ -58,7 +59,7 @@ static const struct davinci_lpsc_clk_info dm646x_psc_info[] = {
{ }
};

-static int dm646x_psc_init(struct device *dev, void __iomem *base)
+int dm646x_psc_init(struct device *dev, void __iomem *base)
{
return davinci_psc_register_clocks(dev, dm646x_psc_info, 46, base);
}
diff --git a/drivers/clk/davinci/psc.c b/drivers/clk/davinci/psc.c
index ce170e600f09..6326ba1fe3cc 100644
--- a/drivers/clk/davinci/psc.c
+++ b/drivers/clk/davinci/psc.c
@@ -15,6 +15,7 @@

#include <linux/clk-provider.h>
#include <linux/clk.h>
+#include <linux/clk/davinci.h>
#include <linux/clkdev.h>
#include <linux/err.h>
#include <linux/of_address.h>
@@ -63,7 +64,7 @@ struct davinci_psc_data {

/**
* struct davinci_lpsc_clk - LPSC clock structure
- * @dev: the device that provides this LPSC
+ * @dev: the device that provides this LPSC or NULL
* @hw: clk_hw for the LPSC
* @pm_domain: power domain for the LPSC
* @genpd_clk: clock reference owned by @pm_domain
@@ -221,6 +222,7 @@ static void davinci_psc_genpd_detach_dev(struct generic_pm_domain *pm_domain,

/**
* davinci_lpsc_clk_register - register LPSC clock
+ * @dev: the clocks's device or NULL
* @name: name of this clock
* @parent_name: name of clock's parent
* @regmap: PSC MMIO region
@@ -238,7 +240,7 @@ davinci_lpsc_clk_register(struct device *dev, const char *name,
int ret;
bool is_on;

- lpsc = devm_kzalloc(dev, sizeof(*lpsc), GFP_KERNEL);
+ lpsc = kzalloc(sizeof(*lpsc), GFP_KERNEL);
if (!lpsc)
return ERR_PTR(-ENOMEM);

@@ -261,9 +263,15 @@ davinci_lpsc_clk_register(struct device *dev, const char *name,
lpsc->pd = pd;
lpsc->flags = flags;

- ret = devm_clk_hw_register(dev, &lpsc->hw);
- if (ret < 0)
+ ret = clk_hw_register(dev, &lpsc->hw);
+ if (ret < 0) {
+ kfree(lpsc);
return ERR_PTR(ret);
+ }
+
+ /* for now, genpd is only registered when using device-tree */
+ if (!dev || !dev->of_node)
+ return lpsc;

/* genpd attach needs a way to look up this clock */
ret = clk_hw_register_clkdev(&lpsc->hw, name, best_dev_name(dev));
@@ -378,13 +386,15 @@ __davinci_psc_register_clocks(struct device *dev,
struct regmap *regmap;
int i, ret;

- psc = devm_kzalloc(dev, sizeof(*psc), GFP_KERNEL);
+ psc = kzalloc(sizeof(*psc), GFP_KERNEL);
if (!psc)
return ERR_PTR(-ENOMEM);

- clks = devm_kmalloc_array(dev, num_clks, sizeof(*clks), GFP_KERNEL);
- if (!clks)
- return ERR_PTR(-ENOMEM);
+ clks = kmalloc_array(num_clks, sizeof(*clks), GFP_KERNEL);
+ if (!clks) {
+ ret = -ENOMEM;
+ goto err_free_psc;
+ }

psc->clk_data.clks = clks;
psc->clk_data.clk_num = num_clks;
@@ -396,16 +406,20 @@ __davinci_psc_register_clocks(struct device *dev,
for (i = 0; i < num_clks; i++)
clks[i] = ERR_PTR(-ENOENT);

- pm_domains = devm_kcalloc(dev, num_clks, sizeof(*pm_domains), GFP_KERNEL);
- if (!pm_domains)
- return ERR_PTR(-ENOMEM);
+ pm_domains = kcalloc(num_clks, sizeof(*pm_domains), GFP_KERNEL);
+ if (!pm_domains) {
+ ret = -ENOMEM;
+ goto err_free_clks;
+ }

psc->pm_data.domains = pm_domains;
psc->pm_data.num_domains = num_clks;

- regmap = devm_regmap_init_mmio(dev, base, &davinci_psc_regmap_config);
- if (IS_ERR(regmap))
- return ERR_CAST(regmap);
+ regmap = regmap_init_mmio(dev, base, &davinci_psc_regmap_config);
+ if (IS_ERR(regmap)) {
+ ret = PTR_ERR(regmap);
+ goto err_free_pm_domains;
+ }

for (; info->name; info++) {
struct davinci_lpsc_clk *lpsc;
@@ -423,6 +437,13 @@ __davinci_psc_register_clocks(struct device *dev,
pm_domains[info->md] = &lpsc->pm_domain;
}

+ /*
+ * for now, a reset controller is only registered when there is a device
+ * to associate it with.
+ */
+ if (!dev)
+ return psc;
+
psc->rcdev.ops = &davinci_psc_reset_ops;
psc->rcdev.owner = THIS_MODULE;
psc->rcdev.dev = dev;
@@ -436,6 +457,15 @@ __davinci_psc_register_clocks(struct device *dev,
dev_warn(dev, "Failed to register reset controller (%d)\n", ret);

return psc;
+
+err_free_pm_domains:
+ kfree(pm_domains);
+err_free_clks:
+ kfree(clks);
+err_free_psc:
+ kfree(psc);
+
+ return ERR_PTR(ret);
}

int davinci_psc_register_clocks(struct device *dev,
diff --git a/include/linux/clk/davinci.h b/include/linux/clk/davinci.h
index ebdd9df1c0ef..62764c5cc86e 100644
--- a/include/linux/clk/davinci.h
+++ b/include/linux/clk/davinci.h
@@ -21,4 +21,9 @@ int dm365_pll2_init(struct device *dev, void __iomem *base, struct regmap *cfgch
int dm644x_pll1_init(struct device *dev, void __iomem *base, struct regmap *cfgchip);
int dm646x_pll1_init(struct device *dev, void __iomem *base, struct regmap *cfgchip);

+int dm355_psc_init(struct device *dev, void __iomem *base);
+int dm365_psc_init(struct device *dev, void __iomem *base);
+int dm644x_psc_init(struct device *dev, void __iomem *base);
+int dm646x_psc_init(struct device *dev, void __iomem *base);
+
#endif /* __LINUX_CLK_DAVINCI_PLL_H___ */
--
2.17.0