linux-kernel - Re: [PATCH v4 04/12] clk: qcom: Add HFPLL driver

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Date:   Tue, 12 Dec 2017 14:35:15 -0600
From:   Rob Herring <robh@...nel.org>
To:     Sricharan R <sricharan@...eaurora.org>
Cc:     mturquette@...libre.com, sboyd@...eaurora.org,
        devicetree@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        viresh.kumar@...aro.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 04/12] clk: qcom: Add HFPLL driver

On Fri, Dec 08, 2017 at 03:12:22PM +0530, Sricharan R wrote:
> From: Stephen Boyd <sboyd@...eaurora.org>
> 
> On some devices (MSM8974 for example), the HFPLLs are
> instantiated within the Krait processor subsystem as separate
> register regions. Add a driver for these PLLs so that we can
> provide HFPLL clocks for use by the system.
> 
> Cc: <devicetree@...r.kernel.org>
> Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
> ---
>  .../devicetree/bindings/clock/qcom,hfpll.txt       |  40 ++++++++
>  drivers/clk/qcom/Kconfig                           |   8 ++
>  drivers/clk/qcom/Makefile                          |   1 +
>  drivers/clk/qcom/hfpll.c                           | 106 +++++++++++++++++++++
>  4 files changed, 155 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/qcom,hfpll.txt
>  create mode 100644 drivers/clk/qcom/hfpll.c
> 
> diff --git a/Documentation/devicetree/bindings/clock/qcom,hfpll.txt b/Documentation/devicetree/bindings/clock/qcom,hfpll.txt
> new file mode 100644
> index 0000000..fee92bb
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/qcom,hfpll.txt
> @@ -0,0 +1,40 @@
> +High-Frequency PLL (HFPLL)
> +
> +PROPERTIES
> +
> +- compatible:
> +	Usage: required
> +	Value type: <string>
> +	Definition: must be "qcom,hfpll"

Fine for a fallback, but please add SoC specific compatibles.

> +
> +- reg:
> +	Usage: required
> +	Value type: <prop-encoded-array>
> +	Definition: address and size of HPLL registers. An optional second
> +		    element specifies the address and size of the alias
> +		    register region.
> +
> +- clock-output-names:
> +	Usage: required
> +	Value type: <string>
> +	Definition: Name of the PLL. Typically hfpllX where X is a CPU number
> +		    starting at 0. Otherwise hfpll_Y where Y is more specific
> +		    such as "l2".
> +
> +Example:
> +
> +1) An HFPLL for the L2 cache.
> +
> +	clock-controller@...16000 {
> +		compatible = "qcom,hfpll";
> +		reg = <0xf9016000 0x30>;
> +		clock-output-names = "hfpll_l2";
> +	};
> +
> +2) An HFPLL for CPU0. This HFPLL has the alias register region.
> +
> +	clock-controller@...8a000 {
> +		compatible = "qcom,hfpll";
> +		reg = <0xf908a000 0x30>, <0xf900a000 0x30>;
> +		clock-output-names = "hfpll0";
> +	};
> diff --git a/drivers/clk/qcom/Kconfig b/drivers/clk/qcom/Kconfig
> index 20b5d6f..6c811bd 100644
> --- a/drivers/clk/qcom/Kconfig
> +++ b/drivers/clk/qcom/Kconfig
> @@ -205,3 +205,11 @@ config SPMI_PMIC_CLKDIV
>  	  Technologies, Inc. SPMI PMIC. It configures the frequency of
>  	  clkdiv outputs of the PMIC. These clocks are typically wired
>  	  through alternate functions on GPIO pins.
> +
> +config QCOM_HFPLL
> +	tristate "High-Frequency PLL (HFPLL) Clock Controller"
> +	depends on COMMON_CLK_QCOM
> +	help
> +	  Support for the high-frequency PLLs present on Qualcomm devices.
> +	  Say Y if you want to support CPU frequency scaling on devices
> +	  such as MSM8974, APQ8084, etc.
> diff --git a/drivers/clk/qcom/Makefile b/drivers/clk/qcom/Makefile
> index 4795e21..4a4bf38 100644
> --- a/drivers/clk/qcom/Makefile
> +++ b/drivers/clk/qcom/Makefile
> @@ -36,3 +36,4 @@ obj-$(CONFIG_MSM_MMCC_8996) += mmcc-msm8996.o
>  obj-$(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_QCOM_HFPLL) += hfpll.o
> diff --git a/drivers/clk/qcom/hfpll.c b/drivers/clk/qcom/hfpll.c
> new file mode 100644
> index 0000000..7405bb6
> --- /dev/null
> +++ b/drivers/clk/qcom/hfpll.c
> @@ -0,0 +1,106 @@
> +/*
> + * Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.

It's 2017.

> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 and
> + * only version 2 as published by the Free Software Foundation.
> + *
> + * 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.

Use SPDX tags.

Rob