clk: qcom: Add TCSR clock driver for SM8750

The TCSR clock controller found on SM8750 provides refclks
for PCIE, USB and UFS. Add clock driver for it.

Signed-off-by: Melody Olvera <[e-mail]>
Reviewed-by: Dmitry Baryshkov <[e-mail]>
Signed-off-by: Taniya Das <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Bjorn Andersson <[e-mail]>

drivers/clk/qcom/Kconfig

···
 	  Support for the TCSR clock controller on SM8650 devices.
 	  Say Y if you want to use peripheral devices such as SD/UFS.
 
+config SM_TCSRCC_8750
+	tristate "SM8750 TCSR Clock Controller"
+	depends on ARM64 || COMPILE_TEST
+	select QCOM_GDSC
+	help
+	  Support for the TCSR clock controller on SM8750 devices.
+	  Say Y if you want to use peripheral devices such as UFS/USB/PCIe.
+
 config SA_VIDEOCC_8775P
 	tristate "SA8775P Video Clock Controller"
 	depends on ARM64 || COMPILE_TEST

drivers/clk/qcom/Makefile

···
 obj-$(CONFIG_SM_GPUCC_8650) += gpucc-sm8650.o
 obj-$(CONFIG_SM_TCSRCC_8550) += tcsrcc-sm8550.o
 obj-$(CONFIG_SM_TCSRCC_8650) += tcsrcc-sm8650.o
+obj-$(CONFIG_SM_TCSRCC_8750) += tcsrcc-sm8750.o
 obj-$(CONFIG_SM_VIDEOCC_7150) += videocc-sm7150.o
 obj-$(CONFIG_SM_VIDEOCC_8150) += videocc-sm8150.o
 obj-$(CONFIG_SM_VIDEOCC_8250) += videocc-sm8250.o

drivers/clk/qcom/tcsrcc-sm8750.c

···
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+/*
+ * Copyright (c) 2024, Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#include <dt-bindings/clock/qcom,sm8750-tcsr.h>
+
+#include "clk-branch.h"
+#include "clk-regmap.h"
+#include "clk-regmap-divider.h"
+#include "clk-regmap-mux.h"
+#include "common.h"
+
+enum {
+	DT_BI_TCXO_PAD,
+};
+
+static struct clk_branch tcsr_pcie_0_clkref_en = {
+	.halt_reg = 0x0,
+	.halt_check = BRANCH_HALT_DELAY,
+	.clkr = {
+		.enable_reg = 0x0,
+		.enable_mask = BIT(0),
+		.hw.init = &(const struct clk_init_data) {
+			.name = "tcsr_pcie_0_clkref_en",
+			.ops = &clk_branch2_ops,
+		},
+	},
+};
+
+static struct clk_branch tcsr_ufs_clkref_en = {
+	.halt_reg = 0x1000,
+	.halt_check = BRANCH_HALT_DELAY,
+	.clkr = {
+		.enable_reg = 0x1000,
+		.enable_mask = BIT(0),
+		.hw.init = &(const struct clk_init_data) {
+			.name = "tcsr_ufs_clkref_en",
+			.parent_data = &(const struct clk_parent_data){
+				.index = DT_BI_TCXO_PAD,
+			},
+			.num_parents = 1,
+			.ops = &clk_branch2_ops,
+		},
+	},
+};
+
+static struct clk_branch tcsr_usb2_clkref_en = {
+	.halt_reg = 0x2000,
+	.halt_check = BRANCH_HALT_DELAY,
+	.clkr = {
+		.enable_reg = 0x2000,
+		.enable_mask = BIT(0),
+		.hw.init = &(const struct clk_init_data) {
+			.name = "tcsr_usb2_clkref_en",
+			.parent_data = &(const struct clk_parent_data){
+				.index = DT_BI_TCXO_PAD,
+			},
+			.num_parents = 1,
+			.ops = &clk_branch2_ops,
+		},
+	},
+};
+
+static struct clk_branch tcsr_usb3_clkref_en = {
+	.halt_reg = 0x3000,
+	.halt_check = BRANCH_HALT_DELAY,
+	.clkr = {
+		.enable_reg = 0x3000,
+		.enable_mask = BIT(0),
+		.hw.init = &(const struct clk_init_data) {
+			.name = "tcsr_usb3_clkref_en",
+			.parent_data = &(const struct clk_parent_data){
+				.index = DT_BI_TCXO_PAD,
+			},
+			.num_parents = 1,
+			.ops = &clk_branch2_ops,
+		},
+	},
+};
+
+static struct clk_regmap *tcsr_cc_sm8750_clocks[] = {
+	[TCSR_PCIE_0_CLKREF_EN] = &tcsr_pcie_0_clkref_en.clkr,
+	[TCSR_UFS_CLKREF_EN] = &tcsr_ufs_clkref_en.clkr,
+	[TCSR_USB2_CLKREF_EN] = &tcsr_usb2_clkref_en.clkr,
+	[TCSR_USB3_CLKREF_EN] = &tcsr_usb3_clkref_en.clkr,
+};
+
+static const struct regmap_config tcsr_cc_sm8750_regmap_config = {
+	.reg_bits = 32,
+	.reg_stride = 4,
+	.val_bits = 32,
+	.max_register = 0x3000,
+	.fast_io = true,
+};
+
+static const struct qcom_cc_desc tcsr_cc_sm8750_desc = {
+	.config = &tcsr_cc_sm8750_regmap_config,
+	.clks = tcsr_cc_sm8750_clocks,
+	.num_clks = ARRAY_SIZE(tcsr_cc_sm8750_clocks),
+};
+
+static const struct of_device_id tcsr_cc_sm8750_match_table[] = {
+	{ .compatible = "qcom,sm8750-tcsr" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, tcsr_cc_sm8750_match_table);
+
+static int tcsr_cc_sm8750_probe(struct platform_device *pdev)
+{
+	return qcom_cc_probe(pdev, &tcsr_cc_sm8750_desc);
+}
+
+static struct platform_driver tcsr_cc_sm8750_driver = {
+	.probe = tcsr_cc_sm8750_probe,
+	.driver = {
+		.name = "tcsr_cc-sm8750",
+		.of_match_table = tcsr_cc_sm8750_match_table,
+	},
+};
+
+static int __init tcsr_cc_sm8750_init(void)
+{
+	return platform_driver_register(&tcsr_cc_sm8750_driver);
+}
+subsys_initcall(tcsr_cc_sm8750_init);
+
+static void __exit tcsr_cc_sm8750_exit(void)
+{
+	platform_driver_unregister(&tcsr_cc_sm8750_driver);
+}
+module_exit(tcsr_cc_sm8750_exit);
+
+MODULE_DESCRIPTION("QTI TCSR_CC SM8750 Driver");
+MODULE_LICENSE("GPL");