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Date: Tue, 12 May 2020 13:12:33 -0700
From: Bjorn Andersson <bjorn.andersson@...aro.org>
To: Sivaprakash Murugesan <sivaprak@...eaurora.org>
Cc: agross@...nel.org, mturquette@...libre.com, sboyd@...nel.org,
robh+dt@...nel.org, jassisinghbrar@...il.com,
linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V4 5/8] clk: qcom: Add ipq apss clock controller
On Sun 03 May 23:20 PDT 2020, Sivaprakash Murugesan wrote:
> The CPU on Qualcomm ipq platform is clocked primarily by a aplha PLL
> and xo which are connected to a mux and enable block.
>
> Add support for the mux and enable block which feeds the CPU on ipq
> based devices.
>
As with the A53 binding, I don't believe that this driver will support
all past, present and future IPQ APSSs. Please make it more specific.
Regards,
Bjorn
> Signed-off-by: Sivaprakash Murugesan <sivaprak@...eaurora.org>
> ---
> [V4]
> * Addressed review comments
> drivers/clk/qcom/Kconfig | 11 +++++
> drivers/clk/qcom/Makefile | 1 +
> drivers/clk/qcom/apss-ipq.c | 106 ++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 118 insertions(+)
> create mode 100644 drivers/clk/qcom/apss-ipq.c
>
> diff --git a/drivers/clk/qcom/Kconfig b/drivers/clk/qcom/Kconfig
> index e70aa01..8d8465e 100644
> --- a/drivers/clk/qcom/Kconfig
> +++ b/drivers/clk/qcom/Kconfig
> @@ -97,6 +97,17 @@ config IPQ_APSS_PLL
> Say Y if you want to support CPU frequency scaling on ipq based
> devices.
>
> +config IPQ_APSS
> + tristate "IPQ APSS Clock Controller"
> + select IPQ_APSS_PLL
> + depends on QCOM_APCS_IPC || COMPILE_TEST
> + help
> + Support for APSS clock controller on IPQ platforms. The
> + APSS clock controller manages the Mux and enable block that feeds the
> + CPUs.
> + Say Y if you want to support CPU frequency scaling on
> + ipq based devices.
> +
> config IPQ_GCC_4019
> tristate "IPQ4019 Global Clock Controller"
> help
> diff --git a/drivers/clk/qcom/Makefile b/drivers/clk/qcom/Makefile
> index b4a6ba1..aab7a58 100644
> --- a/drivers/clk/qcom/Makefile
> +++ b/drivers/clk/qcom/Makefile
> @@ -20,6 +20,7 @@ clk-qcom-$(CONFIG_QCOM_GDSC) += gdsc.o
> obj-$(CONFIG_APQ_GCC_8084) += gcc-apq8084.o
> obj-$(CONFIG_APQ_MMCC_8084) += mmcc-apq8084.o
> obj-$(CONFIG_IPQ_APSS_PLL) += apss-ipq-pll.o
> +obj-$(CONFIG_IPQ_APSS) += apss-ipq.o
> obj-$(CONFIG_IPQ_GCC_4019) += gcc-ipq4019.o
> obj-$(CONFIG_IPQ_GCC_6018) += gcc-ipq6018.o
> obj-$(CONFIG_IPQ_GCC_806X) += gcc-ipq806x.o
> diff --git a/drivers/clk/qcom/apss-ipq.c b/drivers/clk/qcom/apss-ipq.c
> new file mode 100644
> index 0000000..59ed8e7
> --- /dev/null
> +++ b/drivers/clk/qcom/apss-ipq.c
> @@ -0,0 +1,106 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2018, The Linux Foundation. All rights reserved.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/err.h>
> +#include <linux/platform_device.h>
> +#include <linux/clk-provider.h>
> +#include <linux/regmap.h>
> +#include <linux/module.h>
> +
> +#include <dt-bindings/clock/qcom,apss-ipq.h>
> +
> +#include "common.h"
> +#include "clk-regmap.h"
> +#include "clk-branch.h"
> +#include "clk-alpha-pll.h"
> +#include "clk-regmap-mux.h"
> +
> +enum {
> + P_XO,
> + P_APSS_PLL_EARLY,
> +};
> +
> +static const struct clk_parent_data parents_apcs_alias0_clk_src[] = {
> + { .fw_name = "xo" },
> + { .fw_name = "pll" },
> +};
> +
> +static const struct parent_map parents_apcs_alias0_clk_src_map[] = {
> + { P_XO, 0 },
> + { P_APSS_PLL_EARLY, 5 },
> +};
> +
> +static struct clk_regmap_mux apcs_alias0_clk_src = {
> + .reg = 0x0050,
> + .width = 3,
> + .shift = 7,
> + .parent_map = parents_apcs_alias0_clk_src_map,
> + .clkr.hw.init = &(struct clk_init_data){
> + .name = "apcs_alias0_clk_src",
> + .parent_data = parents_apcs_alias0_clk_src,
> + .num_parents = 2,
> + .ops = &clk_regmap_mux_closest_ops,
> + .flags = CLK_SET_RATE_PARENT,
> + },
> +};
> +
> +static struct clk_branch apcs_alias0_core_clk = {
> + .halt_reg = 0x0058,
> + .clkr = {
> + .enable_reg = 0x0058,
> + .enable_mask = BIT(0),
> + .hw.init = &(struct clk_init_data){
> + .name = "apcs_alias0_core_clk",
> + .parent_hws = (const struct clk_hw *[]){
> + &apcs_alias0_clk_src.clkr.hw },
> + .num_parents = 1,
> + .flags = CLK_SET_RATE_PARENT,
> + .ops = &clk_branch2_ops,
> + },
> + },
> +};
> +
> +static const struct regmap_config apss_ipq_regmap_config = {
> + .reg_bits = 32,
> + .reg_stride = 4,
> + .val_bits = 32,
> + .max_register = 0x1000,
> + .fast_io = true,
> +};
> +
> +static struct clk_regmap *apss_ipq_clks[] = {
> + [APCS_ALIAS0_CLK_SRC] = &apcs_alias0_clk_src.clkr,
> + [APCS_ALIAS0_CORE_CLK] = &apcs_alias0_core_clk.clkr,
> +};
> +
> +static const struct qcom_cc_desc apss_ipq_desc = {
> + .config = &apss_ipq_regmap_config,
> + .clks = apss_ipq_clks,
> + .num_clks = ARRAY_SIZE(apss_ipq_clks),
> +};
> +
> +static int apss_ipq_probe(struct platform_device *pdev)
> +{
> + struct regmap *regmap;
> +
> + regmap = dev_get_regmap(pdev->dev.parent, NULL);
> + if (IS_ERR(regmap))
> + return PTR_ERR(regmap);
> +
> + return qcom_cc_really_probe(pdev, &apss_ipq_desc, regmap);
> +}
> +
> +static struct platform_driver apss_ipq_driver = {
> + .probe = apss_ipq_probe,
> + .driver = {
> + .name = "qcom,apss-ipq-clk",
> + },
> +};
> +
> +module_platform_driver(apss_ipq_driver);
> +
> +MODULE_DESCRIPTION("QCOM APSS IPQ CLK Driver");
> +MODULE_LICENSE("GPL v2");
> --
> 2.7.4
>
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