From 56a655e1c41a86445cf2de656649ad93424b2a63 Mon Sep 17 00:00:00 2001 From: Christian Marangi 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 Signed-off-by: Bjorn Andersson 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);