[PATCH v4 1/3] clk: qcom: Add A53 PLL support
From: Georgi Djakov
Date: Mon Dec 14 2015 - 08:59:33 EST
Add support for the PLL, which generates the higher range of CPU
frequencies on MSM8916 platforms.
Signed-off-by: Georgi Djakov <georgi.djakov@xxxxxxxxxx>
---
.../devicetree/bindings/clock/qcom,a53-pll.txt | 18 ++++
drivers/clk/qcom/Kconfig | 9 ++
drivers/clk/qcom/Makefile | 1 +
drivers/clk/qcom/a53-pll.c | 100 ++++++++++++++++++++
4 files changed, 128 insertions(+)
create mode 100644 Documentation/devicetree/bindings/clock/qcom,a53-pll.txt
create mode 100644 drivers/clk/qcom/a53-pll.c
diff --git a/Documentation/devicetree/bindings/clock/qcom,a53-pll.txt b/Documentation/devicetree/bindings/clock/qcom,a53-pll.txt
new file mode 100644
index 000000000000..5cf0af1eecf9
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/qcom,a53-pll.txt
@@ -0,0 +1,18 @@
+A53 PLL Binding
+---------------
+The A53 PLL is the main CPU PLL used for frequencies above 1GHz.
+
+Required properties :
+- compatible : Shall contain only one of the following:
+
+ "qcom,a53-pll"
+
+- reg : shall contain base register location and length
+
+Example:
+
+ a53pll: a53pll@0b016000 {
+ compatible = "qcom,a53-pll";
+ reg = <0x0b016000 0x40>;
+ };
+
diff --git a/drivers/clk/qcom/Kconfig b/drivers/clk/qcom/Kconfig
index b552eceec2be..d06cf687be4f 100644
--- a/drivers/clk/qcom/Kconfig
+++ b/drivers/clk/qcom/Kconfig
@@ -123,3 +123,12 @@ config MSM_MMCC_8996
Support for the multimedia clock controller on msm8996 devices.
Say Y if you want to support multimedia devices such as display,
graphics, video encode/decode, camera, etc.
+
+config QCOM_A53PLL
+ bool "A53 PLL"
+ depends on COMMON_CLK_QCOM
+ help
+ Support for the A53 PLL on some Qualcomm devices. It provides
+ support for CPU frequencies above 1GHz.
+ Say Y if you want to support CPU frequency scaling on devices
+ such as MSM8916.
diff --git a/drivers/clk/qcom/Makefile b/drivers/clk/qcom/Makefile
index dc4280b85db1..c7c26eeab67c 100644
--- a/drivers/clk/qcom/Makefile
+++ b/drivers/clk/qcom/Makefile
@@ -25,3 +25,4 @@ obj-$(CONFIG_MSM_GCC_8996) += gcc-msm8996.o
obj-$(CONFIG_MSM_MMCC_8960) += mmcc-msm8960.o
obj-$(CONFIG_MSM_MMCC_8974) += mmcc-msm8974.o
obj-$(CONFIG_MSM_MMCC_8996) += mmcc-msm8996.o
+obj-$(CONFIG_QCOM_A53PLL) += a53-pll.o
diff --git a/drivers/clk/qcom/a53-pll.c b/drivers/clk/qcom/a53-pll.c
new file mode 100644
index 000000000000..01176240f728
--- /dev/null
+++ b/drivers/clk/qcom/a53-pll.c
@@ -0,0 +1,100 @@
+/*
+ * Copyright (c) 2015, Linaro Limited
+ * Copyright (c) 2014, The Linux Foundation. All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#include "clk-pll.h"
+#include "clk-regmap.h"
+
+static struct pll_freq_tbl a53pll_freq[] = {
+ { 998400000, 52, 0x0, 0x1, 0 },
+ { 1094400000, 57, 0x0, 0x1, 0 },
+ { 1152000000, 62, 0x0, 0x1, 0 },
+ { 1209600000, 65, 0x0, 0x1, 0 },
+ { 1401600000, 73, 0x0, 0x1, 0 },
+};
+
+static const struct regmap_config a53pll_regmap_config = {
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .max_register = 0x40,
+ .fast_io = true,
+ .val_format_endian = REGMAP_ENDIAN_LITTLE,
+};
+
+static const struct of_device_id qcom_a53pll_match_table[] = {
+ { .compatible = "qcom,a53-pll" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, qcom_a53pll_match_table);
+
+static int qcom_a53pll_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct clk_pll *pll;
+ struct resource *res;
+ void __iomem *base;
+ struct clk *clk;
+ struct regmap *regmap;
+ struct clk_init_data init;
+
+ pll = devm_kzalloc(dev, sizeof(*pll), GFP_KERNEL);
+ if (!pll)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
+
+ regmap = devm_regmap_init_mmio(dev, base, &a53pll_regmap_config);
+ if (IS_ERR(regmap))
+ return PTR_ERR(regmap);
+
+ pll->l_reg = 0x04,
+ pll->m_reg = 0x08,
+ pll->n_reg = 0x0c,
+ pll->config_reg = 0x14,
+ pll->mode_reg = 0x00,
+ pll->status_reg = 0x1c,
+ pll->status_bit = 16,
+ pll->freq_tbl = a53pll_freq,
+
+ init.name = "a53pll",
+ init.parent_names = (const char *[]){ "xo" },
+ init.num_parents = 1,
+ init.ops = &clk_pll_sr2_ops,
+ pll->clkr.hw.init = &init;
+
+ clk = devm_clk_register_regmap(dev, &pll->clkr);
+
+ return PTR_ERR_OR_ZERO(clk);
+}
+
+static struct platform_driver qcom_a53pll_driver = {
+ .probe = qcom_a53pll_probe,
+ .driver = {
+ .name = "qcom-a53pll",
+ .of_match_table = qcom_a53pll_match_table,
+ },
+};
+
+module_platform_driver(qcom_a53pll_driver);
+MODULE_DESCRIPTION("Qualcomm A53 PLL Driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:qcom-a53pll");
--
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