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From:   Ansuel Smith <ansuelsmth@gmail.com>
To:     Rob Herring <robh+dt@kernel.org>,
        Bjorn Andersson <bjorn.andersson@linaro.org>,
        Andy Gross <agross@kernel.org>,
        Michael Turquette <mturquette@baylibre.com>,
        Stephen Boyd <sboyd@kernel.org>,
        Peter De Schrijver <pdeschrijver@nvidia.com>,
        Prashant Gaikwad <pgaikwad@nvidia.com>,
        Thierry Reding <thierry.reding@gmail.com>,
        Jonathan Hunter <jonathanh@nvidia.com>,
        Ansuel Smith <ansuelsmth@gmail.com>,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-arm-msm@vger.kernel.org, linux-clk@vger.kernel.org,
        linux-tegra@vger.kernel.org
Subject: [PATCH 08/16] clk: qcom: krait-cc: convert to parent_data API
Date:   Sun, 13 Mar 2022 20:04:11 +0100
Message-Id: <20220313190419.2207-9-ansuelsmth@gmail.com>
In-Reply-To: <20220313190419.2207-1-ansuelsmth@gmail.com>
References: <20220313190419.2207-1-ansuelsmth@gmail.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Modernize the krait-cc driver to parent-data API and refactor to drop
any use of clk_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
implementation. Also fix the parent order of the sec_mux that was wrong
and incorrectly report the wrong safe parent if it's not hardcoded.

Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
---
 drivers/clk/qcom/krait-cc.c | 126 +++++++++++++++++++-----------------
 1 file changed, 66 insertions(+), 60 deletions(-)

diff --git a/drivers/clk/qcom/krait-cc.c b/drivers/clk/qcom/krait-cc.c
index 4d4b657d33c3..645ad9e8dd73 100644
--- a/drivers/clk/qcom/krait-cc.c
+++ b/drivers/clk/qcom/krait-cc.c
@@ -69,21 +69,22 @@ static int krait_notifier_register(struct device *dev, struct clk *clk,
 	return ret;
 }
 
-static int
+static struct clk *
 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 *clk;
+	char *parent_name;
 
 	div = devm_kzalloc(dev, sizeof(*div), GFP_KERNEL);
 	if (!div)
-		return -ENOMEM;
+		return ERR_PTR(-ENOMEM);
 
 	div->width = 2;
 	div->shift = 6;
@@ -93,43 +94,49 @@ krait_add_div(struct device *dev, int id, const char *s, unsigned int offset)
 
 	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;
+
 	clk = devm_clk_register(dev, &div->hw);
-	kfree(p_names[0]);
+
+	kfree(parent_name);
+err_parent_name:
 	kfree(init.name);
 
-	return PTR_ERR_OR_ZERO(clk);
+	return clk;
 }
 
-static int
+static struct clk *
 krait_add_sec_mux(struct device *dev, int id, const char *s,
 		  unsigned int offset, bool unique_aux)
 {
 	int ret;
 	struct krait_mux_clk *mux;
-	static const char *sec_mux_list[] = {
-		"acpu_aux",
-		"qsb",
+	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 *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;
@@ -141,44 +148,51 @@ krait_add_sec_mux(struct device *dev, int id, const char *s,
 
 	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]) {
+		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";
 	}
 
 	clk = devm_clk_register(dev, &mux->hw);
+	if (IS_ERR(clk))
+		goto err_clk;
 
 	ret = krait_notifier_register(dev, clk, mux);
 	if (ret)
-		goto unique_aux;
+		clk = ERR_PTR(ret);
 
-unique_aux:
+err_clk:
 	if (unique_aux)
-		kfree(sec_mux_list[0]);
+		kfree(parent_name);
 err_aux:
 	kfree(init.name);
-	return PTR_ERR_OR_ZERO(clk);
+	return clk;
 }
 
 static struct clk *
-krait_add_pri_mux(struct device *dev, int id, const char *s,
-		  unsigned int offset)
+krait_add_pri_mux(struct device *dev, struct clk *hfpll_div, struct clk *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;
+	char *hfpll_name;
 
 	mux = devm_kzalloc(dev, sizeof(*mux), GFP_KERNEL);
 	if (!mux)
@@ -196,36 +210,29 @@ krait_add_pri_mux(struct device *dev, int id, const char *s,
 	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 = __clk_get_hw(hfpll_div);
+	p_data[2].hw = __clk_get_hw(sec_mux);
 
 	clk = devm_clk_register(dev, &mux->hw);
+	if (IS_ERR(clk))
+		goto err_clk;
 
 	ret = krait_notifier_register(dev, clk, mux);
 	if (ret)
-		goto err_p3;
-err_p3:
-	kfree(p_names[2]);
-err_p2:
-	kfree(p_names[1]);
-err_p1:
-	kfree(p_names[0]);
-err_p0:
+		clk = ERR_PTR(ret);
+
+err_clk:
+	kfree(hfpll_name);
+err_hfpll:
 	kfree(init.name);
 	return clk;
 }
@@ -233,11 +240,10 @@ krait_add_pri_mux(struct device *dev, int id, const char *s,
 /* id < 0 for L2, otherwise id == physical CPU number */
 static struct clk *krait_add_clks(struct device *dev, int id, bool unique_aux)
 {
-	int ret;
 	unsigned int offset;
 	void *p = NULL;
 	const char *s;
-	struct clk *clk;
+	struct clk *hfpll_div, *sec_mux, *clk;
 
 	if (id >= 0) {
 		offset = 0x4501 + (0x1000 * id);
@@ -249,19 +255,19 @@ static struct clk *krait_add_clks(struct device *dev, int id, bool unique_aux)
 		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)) {
+		clk = 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)) {
+		clk = sec_mux;
 		goto err;
 	}
 
-	clk = krait_add_pri_mux(dev, id, s, offset);
+	clk = krait_add_pri_mux(dev, hfpll_div, sec_mux, id, s, offset);
 err:
 	kfree(p);
 	return clk;
-- 
2.34.1