linux-kernel - [PATCH V2 1/5] clk: qcom: apss-ipq-pll: refactor the driver to accommodate different PLL types

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Date:   Wed, 8 Feb 2023 09:58:46 +0530
From:   Kathiravan T <quic_kathirav@...cinc.com>
To:     <agross@...nel.org>, <andersson@...nel.org>,
        <konrad.dybcio@...aro.org>, <mturquette@...libre.com>,
        <sboyd@...nel.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <jassisinghbrar@...il.com>,
        <linux-arm-msm@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <quic_varada@...cinc.com>, <quic_srichara@...cinc.com>,
        Kathiravan T <quic_kathirav@...cinc.com>
Subject: [PATCH V2 1/5] clk: qcom: apss-ipq-pll: refactor the driver to accommodate different PLL types

APSS PLL found on the IPQ8074 and IPQ6018 are of type Huayra PLL. But,
IPQ5332 APSS PLL is of type Stromer Plus. To accommodate both these PLLs,
refactor the driver to take the clk_alpha_pll, alpha_pll_config via driver
data.

Signed-off-by: Kathiravan T <quic_kathirav@...cinc.com>
---
Changes in V2:
	- Added a comment to describe why different offsets are required
	  for PLL

 drivers/clk/qcom/apss-ipq-pll.c | 60 ++++++++++++++++++++++-----------
 1 file changed, 41 insertions(+), 19 deletions(-)

diff --git a/drivers/clk/qcom/apss-ipq-pll.c b/drivers/clk/qcom/apss-ipq-pll.c
index a5aea27eb867..4f2a147e9fb2 100644
--- a/drivers/clk/qcom/apss-ipq-pll.c
+++ b/drivers/clk/qcom/apss-ipq-pll.c
@@ -8,20 +8,27 @@
 
 #include "clk-alpha-pll.h"
 
-static const u8 ipq_pll_offsets[] = {
-	[PLL_OFF_L_VAL] = 0x08,
-	[PLL_OFF_ALPHA_VAL] = 0x10,
-	[PLL_OFF_USER_CTL] = 0x18,
-	[PLL_OFF_CONFIG_CTL] = 0x20,
-	[PLL_OFF_CONFIG_CTL_U] = 0x24,
-	[PLL_OFF_STATUS] = 0x28,
-	[PLL_OFF_TEST_CTL] = 0x30,
-	[PLL_OFF_TEST_CTL_U] = 0x34,
+/*
+ * Even though APSS PLL type is of existing one (like Huayra), its offsets
+ * are different from the one mentioned in the clk-alpha-pll.c, since the
+ * PLL is specific to APSS, so lets the define the same.
+ */
+static const u8 ipq_pll_offsets[][PLL_OFF_MAX_REGS] = {
+	[CLK_ALPHA_PLL_TYPE_HUAYRA] =  {
+		[PLL_OFF_L_VAL] = 0x08,
+		[PLL_OFF_ALPHA_VAL] = 0x10,
+		[PLL_OFF_USER_CTL] = 0x18,
+		[PLL_OFF_CONFIG_CTL] = 0x20,
+		[PLL_OFF_CONFIG_CTL_U] = 0x24,
+		[PLL_OFF_STATUS] = 0x28,
+		[PLL_OFF_TEST_CTL] = 0x30,
+		[PLL_OFF_TEST_CTL_U] = 0x34,
+	},
 };
 
-static struct clk_alpha_pll ipq_pll = {
+static struct clk_alpha_pll ipq_pll_huayra = {
 	.offset = 0x0,
-	.regs = ipq_pll_offsets,
+	.regs = ipq_pll_offsets[CLK_ALPHA_PLL_TYPE_HUAYRA],
 	.flags = SUPPORTS_DYNAMIC_UPDATE,
 	.clkr = {
 		.enable_reg = 0x0,
@@ -61,6 +68,21 @@ static const struct alpha_pll_config ipq8074_pll_config = {
 	.test_ctl_hi_val = 0x4000,
 };
 
+struct apss_pll_data {
+	struct clk_alpha_pll *pll;
+	const struct alpha_pll_config *pll_config;
+};
+
+static struct apss_pll_data ipq8074_pll_data = {
+	.pll = &ipq_pll_huayra,
+	.pll_config = &ipq8074_pll_config,
+};
+
+static struct apss_pll_data ipq6018_pll_data = {
+	.pll = &ipq_pll_huayra,
+	.pll_config = &ipq6018_pll_config,
+};
+
 static const struct regmap_config ipq_pll_regmap_config = {
 	.reg_bits		= 32,
 	.reg_stride		= 4,
@@ -71,7 +93,7 @@ static const struct regmap_config ipq_pll_regmap_config = {
 
 static int apss_ipq_pll_probe(struct platform_device *pdev)
 {
-	const struct alpha_pll_config *ipq_pll_config;
+	const struct apss_pll_data *data;
 	struct device *dev = &pdev->dev;
 	struct regmap *regmap;
 	void __iomem *base;
@@ -85,23 +107,23 @@ static int apss_ipq_pll_probe(struct platform_device *pdev)
 	if (IS_ERR(regmap))
 		return PTR_ERR(regmap);
 
-	ipq_pll_config = of_device_get_match_data(&pdev->dev);
-	if (!ipq_pll_config)
+	data = of_device_get_match_data(&pdev->dev);
+	if (!data)
 		return -ENODEV;
 
-	clk_alpha_pll_configure(&ipq_pll, regmap, ipq_pll_config);
+	clk_alpha_pll_configure(data->pll, regmap, data->pll_config);
 
-	ret = devm_clk_register_regmap(dev, &ipq_pll.clkr);
+	ret = devm_clk_register_regmap(dev, &data->pll->clkr);
 	if (ret)
 		return ret;
 
 	return devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get,
-					   &ipq_pll.clkr.hw);
+					   &data->pll->clkr.hw);
 }
 
 static const struct of_device_id apss_ipq_pll_match_table[] = {
-	{ .compatible = "qcom,ipq6018-a53pll", .data = &ipq6018_pll_config },
-	{ .compatible = "qcom,ipq8074-a53pll", .data = &ipq8074_pll_config },
+	{ .compatible = "qcom,ipq6018-a53pll", .data = &ipq6018_pll_data },
+	{ .compatible = "qcom,ipq8074-a53pll", .data = &ipq8074_pll_data },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, apss_ipq_pll_match_table);
-- 
2.17.1