-From 56a655e1c41a86445cf2de656649ad93424b2a63 Mon Sep 17 00:00:00 2001
-From: Christian Marangi <ansuelsmth@gmail.com>
-Date: Wed, 9 Nov 2022 01:56:31 +0100
-Subject: [PATCH 6/6] clk: qcom: krait-cc: convert to parent_data API
-
-Modernize the krait-cc driver to parent-data API and refactor to drop
-any use of parent_names. From Documentation all the required clocks should
-be declared in DTS so fw_name can be correctly used to get the parents
-for all the muxes. .name is also declared to save compatibility with old
-DT.
-
-While at it also drop some hardcoded index and introduce an enum to make
-index values more clear.
-
-Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
-Signed-off-by: Bjorn Andersson <andersson@kernel.org>
-Link: https://lore.kernel.org/r/20221109005631.3189-5-ansuelsmth@gmail.com
----
- drivers/clk/qcom/krait-cc.c | 202 ++++++++++++++++++++----------------
- 1 file changed, 112 insertions(+), 90 deletions(-)
-
---- a/drivers/clk/qcom/krait-cc.c
-+++ b/drivers/clk/qcom/krait-cc.c
-@@ -15,6 +15,16 @@
-
- #include "clk-krait.h"
-
-+enum {
-+ cpu0_mux = 0,
-+ cpu1_mux,
-+ cpu2_mux,
-+ cpu3_mux,
-+ l2_mux,
-+
-+ clks_max,
-+};
-+
- static unsigned int sec_mux_map[] = {
- 2,
- 0,
-@@ -69,21 +79,23 @@ static int krait_notifier_register(struc
- return ret;
- }
-
--static int
-+static struct clk_hw *
- krait_add_div(struct device *dev, int id, const char *s, unsigned int offset)
- {
- struct krait_div2_clk *div;
-+ static struct clk_parent_data p_data[1];
- struct clk_init_data init = {
-- .num_parents = 1,
-+ .num_parents = ARRAY_SIZE(p_data),
- .ops = &krait_div2_clk_ops,
- .flags = CLK_SET_RATE_PARENT,
- };
-- const char *p_names[1];
-+ struct clk_hw *clk;
-+ char *parent_name;
- int cpu, ret;
-
- div = devm_kzalloc(dev, sizeof(*div), GFP_KERNEL);
- if (!div)
-- return -ENOMEM;
-+ return ERR_PTR(-ENOMEM);
-
- div->width = 2;
- div->shift = 6;
-@@ -93,18 +105,25 @@ krait_add_div(struct device *dev, int id
-
- init.name = kasprintf(GFP_KERNEL, "hfpll%s_div", s);
- if (!init.name)
-- return -ENOMEM;
-+ return ERR_PTR(-ENOMEM);
-
-- init.parent_names = p_names;
-- p_names[0] = kasprintf(GFP_KERNEL, "hfpll%s", s);
-- if (!p_names[0]) {
-- kfree(init.name);
-- return -ENOMEM;
-+ init.parent_data = p_data;
-+ parent_name = kasprintf(GFP_KERNEL, "hfpll%s", s);
-+ if (!parent_name) {
-+ clk = ERR_PTR(-ENOMEM);
-+ goto err_parent_name;
- }
-
-+ p_data[0].fw_name = parent_name;
-+ p_data[0].name = parent_name;
-+
- ret = devm_clk_hw_register(dev, &div->hw);
-- if (ret)
-- goto err;
-+ if (ret) {
-+ clk = ERR_PTR(ret);
-+ goto err_clk;
-+ }
-+
-+ clk = &div->hw;
-
- /* clk-krait ignore any rate change if mux is not flagged as enabled */
- if (id < 0)
-@@ -113,33 +132,36 @@ krait_add_div(struct device *dev, int id
- else
- clk_prepare_enable(div->hw.clk);
-
--err:
-- kfree(p_names[0]);
-+err_clk:
-+ kfree(parent_name);
-+err_parent_name:
- kfree(init.name);
-
-- return ret;
-+ return clk;
- }
-
--static int
-+static struct clk_hw *
- krait_add_sec_mux(struct device *dev, int id, const char *s,
- unsigned int offset, bool unique_aux)
- {
- int cpu, ret;
- struct krait_mux_clk *mux;
-- static const char *sec_mux_list[] = {
-- "qsb",
-- "acpu_aux",
-+ static struct clk_parent_data sec_mux_list[2] = {
-+ { .name = "qsb", .fw_name = "qsb" },
-+ {},
- };
- struct clk_init_data init = {
-- .parent_names = sec_mux_list,
-+ .parent_data = sec_mux_list,
- .num_parents = ARRAY_SIZE(sec_mux_list),
- .ops = &krait_mux_clk_ops,
- .flags = CLK_SET_RATE_PARENT,
- };
-+ struct clk_hw *clk;
-+ char *parent_name;
-
- mux = devm_kzalloc(dev, sizeof(*mux), GFP_KERNEL);
- if (!mux)
-- return -ENOMEM;
-+ return ERR_PTR(-ENOMEM);
-
- mux->offset = offset;
- mux->lpl = id >= 0;
-@@ -159,23 +181,33 @@ krait_add_sec_mux(struct device *dev, in
-
- init.name = kasprintf(GFP_KERNEL, "krait%s_sec_mux", s);
- if (!init.name)
-- return -ENOMEM;
-+ return ERR_PTR(-ENOMEM);
-
- if (unique_aux) {
-- sec_mux_list[0] = kasprintf(GFP_KERNEL, "acpu%s_aux", s);
-- if (!sec_mux_list[0]) {
-- ret = -ENOMEM;
-+ parent_name = kasprintf(GFP_KERNEL, "acpu%s_aux", s);
-+ if (!parent_name) {
-+ clk = ERR_PTR(-ENOMEM);
- goto err_aux;
- }
-+ sec_mux_list[1].fw_name = parent_name;
-+ sec_mux_list[1].name = parent_name;
-+ } else {
-+ sec_mux_list[1].name = "apu_aux";
- }
-
- ret = devm_clk_hw_register(dev, &mux->hw);
-- if (ret)
-- goto unique_aux;
-+ if (ret) {
-+ clk = ERR_PTR(ret);
-+ goto err_clk;
-+ }
-+
-+ clk = &mux->hw;
-
- ret = krait_notifier_register(dev, mux->hw.clk, mux);
-- if (ret)
-- goto unique_aux;
-+ if (ret) {
-+ clk = ERR_PTR(ret);
-+ goto err_clk;
-+ }
-
- /* clk-krait ignore any rate change if mux is not flagged as enabled */
- if (id < 0)
-@@ -184,28 +216,29 @@ krait_add_sec_mux(struct device *dev, in
- else
- clk_prepare_enable(mux->hw.clk);
-
--unique_aux:
-+err_clk:
- if (unique_aux)
-- kfree(sec_mux_list[0]);
-+ kfree(parent_name);
- err_aux:
- kfree(init.name);
-- return ret;
-+ return clk;
- }
-
--static struct clk *
--krait_add_pri_mux(struct device *dev, int id, const char *s,
-- unsigned int offset)
-+static struct clk_hw *
-+krait_add_pri_mux(struct device *dev, struct clk_hw *hfpll_div, struct clk_hw *sec_mux,
-+ int id, const char *s, unsigned int offset)
- {
- int ret;
- struct krait_mux_clk *mux;
-- const char *p_names[3];
-+ static struct clk_parent_data p_data[3];
- struct clk_init_data init = {
-- .parent_names = p_names,
-- .num_parents = ARRAY_SIZE(p_names),
-+ .parent_data = p_data,
-+ .num_parents = ARRAY_SIZE(p_data),
- .ops = &krait_mux_clk_ops,
- .flags = CLK_SET_RATE_PARENT,
- };
-- struct clk *clk;
-+ struct clk_hw *clk;
-+ char *hfpll_name;
-
- mux = devm_kzalloc(dev, sizeof(*mux), GFP_KERNEL);
- if (!mux)
-@@ -223,55 +256,44 @@ krait_add_pri_mux(struct device *dev, in
- if (!init.name)
- return ERR_PTR(-ENOMEM);
-
-- p_names[0] = kasprintf(GFP_KERNEL, "hfpll%s", s);
-- if (!p_names[0]) {
-+ hfpll_name = kasprintf(GFP_KERNEL, "hfpll%s", s);
-+ if (!hfpll_name) {
- clk = ERR_PTR(-ENOMEM);
-- goto err_p0;
-+ goto err_hfpll;
- }
-
-- p_names[1] = kasprintf(GFP_KERNEL, "hfpll%s_div", s);
-- if (!p_names[1]) {
-- clk = ERR_PTR(-ENOMEM);
-- goto err_p1;
-- }
-+ p_data[0].fw_name = hfpll_name;
-+ p_data[0].name = hfpll_name;
-
-- p_names[2] = kasprintf(GFP_KERNEL, "krait%s_sec_mux", s);
-- if (!p_names[2]) {
-- clk = ERR_PTR(-ENOMEM);
-- goto err_p2;
-- }
-+ p_data[1].hw = hfpll_div;
-+ p_data[2].hw = sec_mux;
-
- ret = devm_clk_hw_register(dev, &mux->hw);
- if (ret) {
- clk = ERR_PTR(ret);
-- goto err_p3;
-+ goto err_clk;
- }
-
-- clk = mux->hw.clk;
-+ clk = &mux->hw;
-
-- ret = krait_notifier_register(dev, clk, mux);
-+ ret = krait_notifier_register(dev, mux->hw.clk, mux);
- if (ret)
- clk = ERR_PTR(ret);
-
--err_p3:
-- kfree(p_names[2]);
--err_p2:
-- kfree(p_names[1]);
--err_p1:
-- kfree(p_names[0]);
--err_p0:
-+err_clk:
-+ kfree(hfpll_name);
-+err_hfpll:
- kfree(init.name);
- return clk;
- }
-
- /* id < 0 for L2, otherwise id == physical CPU number */
--static struct clk *krait_add_clks(struct device *dev, int id, bool unique_aux)
-+static struct clk_hw *krait_add_clks(struct device *dev, int id, bool unique_aux)
- {
-- int ret;
-+ struct clk_hw *hfpll_div, *sec_mux, *pri_mux;
- unsigned int offset;
- void *p = NULL;
- const char *s;
-- struct clk *clk;
-
- if (id >= 0) {
- offset = 0x4501 + (0x1000 * id);
-@@ -283,22 +305,23 @@ static struct clk *krait_add_clks(struct
- s = "_l2";
- }
-
-- ret = krait_add_div(dev, id, s, offset);
-- if (ret) {
-- clk = ERR_PTR(ret);
-+ hfpll_div = krait_add_div(dev, id, s, offset);
-+ if (IS_ERR(hfpll_div)) {
-+ pri_mux = hfpll_div;
- goto err;
- }
-
-- ret = krait_add_sec_mux(dev, id, s, offset, unique_aux);
-- if (ret) {
-- clk = ERR_PTR(ret);
-+ sec_mux = krait_add_sec_mux(dev, id, s, offset, unique_aux);
-+ if (IS_ERR(sec_mux)) {
-+ pri_mux = sec_mux;
- goto err;
- }
-
-- clk = krait_add_pri_mux(dev, id, s, offset);
-+ pri_mux = krait_add_pri_mux(dev, hfpll_div, sec_mux, id, s, offset);
-+
- err:
- kfree(p);
-- return clk;
-+ return pri_mux;
- }
-
- static struct clk *krait_of_get(struct of_phandle_args *clkspec, void *data)
-@@ -306,7 +329,7 @@ static struct clk *krait_of_get(struct o
- unsigned int idx = clkspec->args[0];
- struct clk **clks = data;
-
-- if (idx >= 5) {
-+ if (idx >= clks_max) {
- pr_err("%s: invalid clock index %d\n", __func__, idx);
- return ERR_PTR(-EINVAL);
- }
-@@ -327,9 +350,8 @@ static int krait_cc_probe(struct platfor
- const struct of_device_id *id;
- unsigned long cur_rate, aux_rate;
- int cpu;
-- struct clk *clk;
-- struct clk **clks;
-- struct clk *l2_pri_mux_clk;
-+ struct clk_hw *mux, *l2_pri_mux;
-+ struct clk *clk, **clks;
-
- id = of_match_device(krait_cc_match_table, dev);
- if (!id)
-@@ -348,21 +370,21 @@ static int krait_cc_probe(struct platfor
- }
-
- /* Krait configurations have at most 4 CPUs and one L2 */
-- clks = devm_kcalloc(dev, 5, sizeof(*clks), GFP_KERNEL);
-+ clks = devm_kcalloc(dev, clks_max, sizeof(*clks), GFP_KERNEL);
- if (!clks)
- return -ENOMEM;
-
- for_each_possible_cpu(cpu) {
-- clk = krait_add_clks(dev, cpu, id->data);
-+ mux = krait_add_clks(dev, cpu, id->data);
- if (IS_ERR(clk))
- return PTR_ERR(clk);
-- clks[cpu] = clk;
-+ clks[cpu] = mux->clk;
- }
-
-- l2_pri_mux_clk = krait_add_clks(dev, -1, id->data);
-- if (IS_ERR(l2_pri_mux_clk))
-- return PTR_ERR(l2_pri_mux_clk);
-- clks[4] = l2_pri_mux_clk;
-+ l2_pri_mux = krait_add_clks(dev, -1, id->data);
-+ if (IS_ERR(l2_pri_mux))
-+ return PTR_ERR(l2_pri_mux);
-+ clks[l2_mux] = l2_pri_mux->clk;
-
- /*
- * We don't want the CPU or L2 clocks to be turned off at late init
-@@ -372,7 +394,7 @@ static int krait_cc_probe(struct platfor
- * they take over.
- */
- for_each_online_cpu(cpu) {
-- clk_prepare_enable(l2_pri_mux_clk);
-+ clk_prepare_enable(clks[l2_mux]);
- WARN(clk_prepare_enable(clks[cpu]),
- "Unable to turn on CPU%d clock", cpu);
- }
-@@ -388,16 +410,16 @@ static int krait_cc_probe(struct platfor
- * two different rates to force a HFPLL reinit under all
- * circumstances.
- */
-- cur_rate = clk_get_rate(l2_pri_mux_clk);
-+ cur_rate = clk_get_rate(clks[l2_mux]);
- aux_rate = 384000000;
- if (cur_rate < aux_rate) {
- pr_info("L2 @ Undefined rate. Forcing new rate.\n");
- cur_rate = aux_rate;
- }
-- clk_set_rate(l2_pri_mux_clk, aux_rate);
-- clk_set_rate(l2_pri_mux_clk, 2);
-- clk_set_rate(l2_pri_mux_clk, cur_rate);
-- pr_info("L2 @ %lu KHz\n", clk_get_rate(l2_pri_mux_clk) / 1000);
-+ clk_set_rate(clks[l2_mux], aux_rate);
-+ clk_set_rate(clks[l2_mux], 2);
-+ clk_set_rate(clks[l2_mux], cur_rate);
-+ pr_info("L2 @ %lu KHz\n", clk_get_rate(clks[l2_mux]) / 1000);
- for_each_possible_cpu(cpu) {
- clk = clks[cpu];
- cur_rate = clk_get_rate(clk);