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    Subject[PATCH v9 09/15] clk: qcom: Add KPSS ACC/GCC driver
    Date
    From: Stephen Boyd <sboyd@codeaurora.org>

    The ACC and GCC regions present in KPSSv1 contain registers to
    control clocks and power to each Krait CPU and L2. For CPUfreq
    purposes probe these devices and expose a mux clock that chooses
    between PXO and PLL8.

    Cc: <devicetree@vger.kernel.org>
    Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
    ---
    drivers/clk/qcom/Kconfig | 8 +++++
    drivers/clk/qcom/Makefile | 1 +
    drivers/clk/qcom/kpss-xcc.c | 87 +++++++++++++++++++++++++++++++++++++++++++++
    3 files changed, 96 insertions(+)
    create mode 100644 drivers/clk/qcom/kpss-xcc.c

    diff --git a/drivers/clk/qcom/Kconfig b/drivers/clk/qcom/Kconfig
    index bf14f56..8fca65d 100644
    --- a/drivers/clk/qcom/Kconfig
    +++ b/drivers/clk/qcom/Kconfig
    @@ -235,6 +235,14 @@ config QCOM_HFPLL
    Say Y if you want to support CPU frequency scaling on devices
    such as MSM8974, APQ8084, etc.

    +config KPSS_XCC
    + tristate "KPSS Clock Controller"
    + depends on COMMON_CLK_QCOM
    + help
    + Support for the Krait ACC and GCC clock controllers. Say Y
    + if you want to support CPU frequency scaling on devices such
    + as MSM8960, APQ8064, etc.
    +
    config KRAIT_CLOCKS
    bool
    select KRAIT_L2_ACCESSORS
    diff --git a/drivers/clk/qcom/Makefile b/drivers/clk/qcom/Makefile
    index e1e96f6..24e598a 100644
    --- a/drivers/clk/qcom/Makefile
    +++ b/drivers/clk/qcom/Makefile
    @@ -40,4 +40,5 @@ obj-$(CONFIG_QCOM_CLK_APCS_MSM8916) += apcs-msm8916.o
    obj-$(CONFIG_QCOM_CLK_RPM) += clk-rpm.o
    obj-$(CONFIG_QCOM_CLK_SMD_RPM) += clk-smd-rpm.o
    obj-$(CONFIG_SPMI_PMIC_CLKDIV) += clk-spmi-pmic-div.o
    +obj-$(CONFIG_KPSS_XCC) += kpss-xcc.o
    obj-$(CONFIG_QCOM_HFPLL) += hfpll.o
    diff --git a/drivers/clk/qcom/kpss-xcc.c b/drivers/clk/qcom/kpss-xcc.c
    new file mode 100644
    index 0000000..8590b5e
    --- /dev/null
    +++ b/drivers/clk/qcom/kpss-xcc.c
    @@ -0,0 +1,87 @@
    +// SPDX-License-Identifier: GPL-2.0
    +// Copyright (c) 2018, The Linux Foundation. All rights reserved.
    +
    +#include <linux/kernel.h>
    +#include <linux/init.h>
    +#include <linux/module.h>
    +#include <linux/platform_device.h>
    +#include <linux/err.h>
    +#include <linux/io.h>
    +#include <linux/of.h>
    +#include <linux/of_device.h>
    +#include <linux/clk.h>
    +#include <linux/clk-provider.h>
    +
    +static const char *aux_parents[] = {
    + "pll8_vote",
    + "pxo",
    +};
    +
    +static unsigned int aux_parent_map[] = {
    + 3,
    + 0,
    +};
    +
    +static const struct of_device_id kpss_xcc_match_table[] = {
    + { .compatible = "qcom,kpss-acc-v1", .data = (void *)1UL },
    + { .compatible = "qcom,kpss-gcc" },
    + {}
    +};
    +MODULE_DEVICE_TABLE(of, kpss_xcc_match_table);
    +
    +static int kpss_xcc_driver_probe(struct platform_device *pdev)
    +{
    + const struct of_device_id *id;
    + struct clk *clk;
    + struct resource *res;
    + void __iomem *base;
    + const char *name;
    +
    + id = of_match_device(kpss_xcc_match_table, &pdev->dev);
    + if (!id)
    + return -ENODEV;
    +
    + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    + base = devm_ioremap_resource(&pdev->dev, res);
    + if (IS_ERR(base))
    + return PTR_ERR(base);
    +
    + if (id->data) {
    + if (of_property_read_string_index(pdev->dev.of_node,
    + "clock-output-names",
    + 0, &name))
    + return -ENODEV;
    + base += 0x14;
    + } else {
    + name = "acpu_l2_aux";
    + base += 0x28;
    + }
    +
    + clk = clk_register_mux_table(&pdev->dev, name, aux_parents,
    + ARRAY_SIZE(aux_parents), 0, base, 0, 0x3,
    + 0, aux_parent_map, NULL);
    +
    + platform_set_drvdata(pdev, clk);
    +
    + return PTR_ERR_OR_ZERO(clk);
    +}
    +
    +static int kpss_xcc_driver_remove(struct platform_device *pdev)
    +{
    + clk_unregister_mux(platform_get_drvdata(pdev));
    + return 0;
    +}
    +
    +static struct platform_driver kpss_xcc_driver = {
    + .probe = kpss_xcc_driver_probe,
    + .remove = kpss_xcc_driver_remove,
    + .driver = {
    + .name = "kpss-xcc",
    + .of_match_table = kpss_xcc_match_table,
    + },
    +};
    +module_platform_driver(kpss_xcc_driver);
    +
    +MODULE_DESCRIPTION("Krait Processor Sub System (KPSS) Clock Driver");
    +MODULE_LICENSE("GPL v2");
    +MODULE_ALIAS("platform:kpss-xcc");
    --
    QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation
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