clk: qcom: Add SM6115 LPASSCC

SM6115 (and its derivatives or similar SoCs) has an LPASS clock
controller block which provides audio-related resets.

Add the required code to support them.

[alexey.klimov] fixed compilation errors after rebase,
slightly changed the commit message

Cc: Konrad Dybcio <[email protected]>
Cc: Konrad Dybcio <[email protected]>
Cc: Srinivas Kandagatla <[email protected]>
Signed-off-by: Konrad Dybcio <[email protected]>
Signed-off-by: Alexey Klimov <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Bjorn Andersson <[email protected]>

Author: konradybcio

drivers/clk/qcom/Kconfig

@@ -1278,6 +1278,15 @@ config SM_GPUCC_8650
 	  Say Y if you want to support graphics controller devices and
 	  functionality such as 3D graphics.
 
+config SM_LPASSCC_6115
+	tristate "SM6115 Low Power Audio Subsystem (LPASS) Clock Controller"
+	depends on ARM64 || COMPILE_TEST
+	select SM_GCC_6115
+	help
+	  Support for the LPASS clock controller on SM6115 devices.
+	  Say Y if you want to toggle LPASS-adjacent resets within
+	  this clock controller to reset the LPASS subsystem.
+
 config SM_TCSRCC_8550
 	tristate "SM8550 TCSR Clock Controller"
 	depends on ARM64 || COMPILE_TEST

drivers/clk/qcom/Makefile

@@ -159,6 +159,7 @@ obj-$(CONFIG_SM_GPUCC_8350) += gpucc-sm8350.o
 obj-$(CONFIG_SM_GPUCC_8450) += gpucc-sm8450.o
 obj-$(CONFIG_SM_GPUCC_8550) += gpucc-sm8550.o
 obj-$(CONFIG_SM_GPUCC_8650) += gpucc-sm8650.o
+obj-$(CONFIG_SM_LPASSCC_6115) += lpasscc-sm6115.o
 obj-$(CONFIG_SM_TCSRCC_8550) += tcsrcc-sm8550.o
 obj-$(CONFIG_SM_TCSRCC_8650) += tcsrcc-sm8650.o
 obj-$(CONFIG_SM_TCSRCC_8750) += tcsrcc-sm8750.o

drivers/clk/qcom/lpasscc-sm6115.c

@@ -0,0 +1,85 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2022, 2023 Linaro Limited
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#include <dt-bindings/clock/qcom,sm6115-lpasscc.h>
+
+#include "common.h"
+#include "reset.h"
+
+static const struct qcom_reset_map lpass_audiocc_sm6115_resets[] = {
+	[LPASS_AUDIO_SWR_RX_CGCR] =  { .reg = 0x98, .bit = 1, .udelay = 500 },
+};
+
+static struct regmap_config lpass_audiocc_sm6115_regmap_config = {
+	.reg_bits = 32,
+	.reg_stride = 4,
+	.val_bits = 32,
+	.name = "lpass-audio-csr",
+	.max_register = 0x1000,
+};
+
+static const struct qcom_cc_desc lpass_audiocc_sm6115_reset_desc = {
+	.config = &lpass_audiocc_sm6115_regmap_config,
+	.resets = lpass_audiocc_sm6115_resets,
+	.num_resets = ARRAY_SIZE(lpass_audiocc_sm6115_resets),
+};
+
+static const struct qcom_reset_map lpasscc_sm6115_resets[] = {
+	[LPASS_SWR_TX_CONFIG_CGCR] = { .reg = 0x100, .bit = 1, .udelay = 500 },
+};
+
+static struct regmap_config lpasscc_sm6115_regmap_config = {
+	.reg_bits = 32,
+	.reg_stride = 4,
+	.val_bits = 32,
+	.name = "lpass-tcsr",
+	.max_register = 0x1000,
+};
+
+static const struct qcom_cc_desc lpasscc_sm6115_reset_desc = {
+	.config = &lpasscc_sm6115_regmap_config,
+	.resets = lpasscc_sm6115_resets,
+	.num_resets = ARRAY_SIZE(lpasscc_sm6115_resets),
+};
+
+static const struct of_device_id lpasscc_sm6115_match_table[] = {
+	{
+		.compatible = "qcom,sm6115-lpassaudiocc",
+		.data = &lpass_audiocc_sm6115_reset_desc,
+	}, {
+		.compatible = "qcom,sm6115-lpasscc",
+		.data = &lpasscc_sm6115_reset_desc,
+	},
+	{ },
+};
+MODULE_DEVICE_TABLE(of, lpasscc_sm6115_match_table);
+
+static int lpasscc_sm6115_probe(struct platform_device *pdev)
+{
+	const struct qcom_cc_desc *desc = of_device_get_match_data(&pdev->dev);
+
+	return qcom_cc_probe_by_index(pdev, 0, desc);
+}
+
+static struct platform_driver lpasscc_sm6115_driver = {
+	.probe = lpasscc_sm6115_probe,
+	.driver = {
+		.name = "lpasscc-sm6115",
+		.of_match_table = lpasscc_sm6115_match_table,
+	},
+};
+
+module_platform_driver(lpasscc_sm6115_driver);
+
+MODULE_DESCRIPTION("QTI LPASSCC SM6115 Driver");
+MODULE_LICENSE("GPL");