clk: bcm: kona: Migrate to clk_hw based registration and OF APIs

Now that we can use clk_hw pointers we don't need to have two
duplicate arrays holding the same mapping of clk index to clk_hw
pointer. Implement a custom clk_hw provider function to map the
OF specifier to the clk_hw instance for it.

Cc: Alex Elder <elder@linaro.org>
Signed-off-by: Stephen Boyd <stephen.boyd@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

diff --git a/drivers/clk/bcm/clk-kona-setup.c b/drivers/clk/bcm/clk-kona-setup.c
index 526b0b0e9a9f9f4f79fea3812177487dfe586c11..f2359b3b73bc07ff5e7a9e436e32289c85e89400 100644 (file)
--- a/drivers/clk/bcm/clk-kona-setup.c
+++ b/drivers/clk/bcm/clk-kona-setup.c
@@ -696,77 +696,69 @@ static void bcm_clk_teardown(struct kona_clk *bcm_clk)
        bcm_clk->type = bcm_clk_none;
 }
 
-static void kona_clk_teardown(struct clk *clk)
+static void kona_clk_teardown(struct clk_hw *hw)
 {
-       struct clk_hw *hw;
        struct kona_clk *bcm_clk;
 
-       if (!clk)
+       if (!hw)
                return;
 
-       hw = __clk_get_hw(clk);
-       if (!hw) {
-               pr_err("%s: clk %p has null hw pointer\n", __func__, clk);
-               return;
-       }
-       clk_unregister(clk);
+       clk_hw_unregister(hw);
 
        bcm_clk = to_kona_clk(hw);
        bcm_clk_teardown(bcm_clk);
 }
 
-struct clk *kona_clk_setup(struct kona_clk *bcm_clk)
+static int kona_clk_setup(struct kona_clk *bcm_clk)
 {
+       int ret;
        struct clk_init_data *init_data = &bcm_clk->init_data;
-       struct clk *clk = NULL;
 
        switch (bcm_clk->type) {
        case bcm_clk_peri:
-               if (peri_clk_setup(bcm_clk->u.data, init_data))
-                       return NULL;
+               ret = peri_clk_setup(bcm_clk->u.data, init_data);
+               if (ret)
+                       return ret;
                break;
        default:
                pr_err("%s: clock type %d invalid for %s\n", __func__,
                        (int)bcm_clk->type, init_data->name);
-               return NULL;
+               return -EINVAL;
        }
 
        /* Make sure everything makes sense before we set it up */
        if (!kona_clk_valid(bcm_clk)) {
                pr_err("%s: clock data invalid for %s\n", __func__,
                        init_data->name);
+               ret = -EINVAL;
                goto out_teardown;
        }
 
        bcm_clk->hw.init = init_data;
-       clk = clk_register(NULL, &bcm_clk->hw);
-       if (IS_ERR(clk)) {
-               pr_err("%s: error registering clock %s (%ld)\n", __func__,
-                       init_data->name, PTR_ERR(clk));
+       ret = clk_hw_register(NULL, &bcm_clk->hw);
+       if (ret) {
+               pr_err("%s: error registering clock %s (%d)\n", __func__,
+                       init_data->name, ret);
                goto out_teardown;
        }
-       BUG_ON(!clk);
 
-       return clk;
+       return 0;
 out_teardown:
        bcm_clk_teardown(bcm_clk);
 
-       return NULL;
+       return ret;
 }
 
 static void ccu_clks_teardown(struct ccu_data *ccu)
 {
        u32 i;
 
-       for (i = 0; i < ccu->clk_data.clk_num; i++)
-               kona_clk_teardown(ccu->clk_data.clks[i]);
-       kfree(ccu->clk_data.clks);
+       for (i = 0; i < ccu->clk_num; i++)
+               kona_clk_teardown(&ccu->kona_clks[i].hw);
 }
 
 static void kona_ccu_teardown(struct ccu_data *ccu)
 {
-       kfree(ccu->clk_data.clks);
-       ccu->clk_data.clks = NULL;
        if (!ccu->base)
                return;
 
@@ -793,6 +785,20 @@ static bool ccu_data_valid(struct ccu_data *ccu)
        return true;
 }
 
+static struct clk_hw *
+of_clk_kona_onecell_get(struct of_phandle_args *clkspec, void *data)
+{
+       struct ccu_data *ccu = data;
+       unsigned int idx = clkspec->args[0];
+
+       if (idx >= ccu->clk_num) {
+               pr_err("%s: invalid index %u\n", __func__, idx);
+               return ERR_PTR(-EINVAL);
+       }
+
+       return &ccu->kona_clks[idx].hw;
+}
+
 /*
  * Set up a CCU.  Call the provided ccu_clks_setup callback to
  * initialize the array of clocks provided by the CCU.
@@ -805,18 +811,6 @@ void __init kona_dt_ccu_setup(struct ccu_data *ccu,
        unsigned int i;
        int ret;
 
-       if (ccu->clk_data.clk_num) {
-               size_t size;
-
-               size = ccu->clk_data.clk_num * sizeof(*ccu->clk_data.clks);
-               ccu->clk_data.clks = kzalloc(size, GFP_KERNEL);
-               if (!ccu->clk_data.clks) {
-                       pr_err("%s: unable to allocate %u clocks for %s\n",
-                               __func__, ccu->clk_data.clk_num, node->name);
-                       return;
-               }
-       }
-
        ret = of_address_to_resource(node, 0, &res);
        if (ret) {
                pr_err("%s: no valid CCU registers found for %s\n", __func__,
@@ -851,13 +845,13 @@ void __init kona_dt_ccu_setup(struct ccu_data *ccu,
         * the clock framework clock array (in ccu->data).  Then
         * register as a provider for these clocks.
         */
-       for (i = 0; i < ccu->clk_data.clk_num; i++) {
+       for (i = 0; i < ccu->clk_num; i++) {
                if (!ccu->kona_clks[i].ccu)
                        continue;
-               ccu->clk_data.clks[i] = kona_clk_setup(&ccu->kona_clks[i]);
+               kona_clk_setup(&ccu->kona_clks[i]);
        }
 
-       ret = of_clk_add_provider(node, of_clk_src_onecell_get, &ccu->clk_data);
+       ret = of_clk_add_hw_provider(node, of_clk_kona_onecell_get, ccu);
        if (ret) {
                pr_err("%s: error adding ccu %s as provider (%d)\n", __func__,
                                node->name, ret);

diff --git a/drivers/clk/bcm/clk-kona.c b/drivers/clk/bcm/clk-kona.c
index 3a15347b423348b83a70613ad5e6b880d05f8875..eee64b9e5d10b497d8362acbb92ad8312c9ce4f5 100644 (file)
--- a/drivers/clk/bcm/clk-kona.c
+++ b/drivers/clk/bcm/clk-kona.c
@@ -1256,19 +1256,18 @@ bool __init kona_ccu_init(struct ccu_data *ccu)
 {
        unsigned long flags;
        unsigned int which;
-       struct clk **clks = ccu->clk_data.clks;
        struct kona_clk *kona_clks = ccu->kona_clks;
        bool success = true;
 
        flags = ccu_lock(ccu);
        __ccu_write_enable(ccu);
 
-       for (which = 0; which < ccu->clk_data.clk_num; which++) {
-               struct kona_clk *bcm_clk;
+       for (which = 0; which < ccu->clk_num; which++) {
+               struct kona_clk *bcm_clk = &kona_clks[which];
 
-               if (!clks[which])
+               if (!bcm_clk->ccu)
                        continue;
-               bcm_clk = &kona_clks[which];
+
                success &= __kona_clk_init(bcm_clk);
        }
 

diff --git a/drivers/clk/bcm/clk-kona.h b/drivers/clk/bcm/clk-kona.h
index 906576ec97b6f9176fa6e0cfe6390e2856dcfc06..f4b39bb5558a7483ecc341a1628503f7ab0b0c51 100644 (file)
--- a/drivers/clk/bcm/clk-kona.h
+++ b/drivers/clk/bcm/clk-kona.h
@@ -481,7 +481,7 @@ struct ccu_data {
        bool write_enabled;     /* write access is currently enabled */
        struct ccu_policy policy;
        struct device_node *node;
-       struct clk_onecell_data clk_data;
+       size_t clk_num;
        const char *name;
        u32 range;              /* byte range of address space */
        struct kona_clk kona_clks[];    /* must be last */
@@ -491,9 +491,7 @@ struct ccu_data {
 #define KONA_CCU_COMMON(_prefix, _name, _ccuname)                          \
        .name           = #_name "_ccu",                                    \
        .lock           = __SPIN_LOCK_UNLOCKED(_name ## _ccu_data.lock),    \
-       .clk_data       = {                                                 \
-               .clk_num = _prefix ## _ ## _ccuname ## _CCU_CLOCK_COUNT,    \
-       }
+       .clk_num        = _prefix ## _ ## _ccuname ## _CCU_CLOCK_COUNT
 
 /* Exported globals */
 
@@ -505,7 +503,6 @@ extern u64 scaled_div_max(struct bcm_clk_div *div);
 extern u64 scaled_div_build(struct bcm_clk_div *div, u32 div_value,
                                u32 billionths);
 
-extern struct clk *kona_clk_setup(struct kona_clk *bcm_clk);
 extern void __init kona_dt_ccu_setup(struct ccu_data *ccu,
                                struct device_node *node);
 extern bool __init kona_ccu_init(struct ccu_data *ccu);