linux-kernel - Re: [PATCH v5 2/2] clk: intel: Add CGU clock driver for a new SoC

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Date:   Tue, 18 Feb 2020 23:59:14 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Rahul Tanwar <rahul.tanwar@...ux.intel.com>,
        mturquette@...libre.com, sboyd@...nel.org, robh@...nel.org,
        mark.rutland@....com, linux-clk@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        andriy.shevchenko@...el.com, qi-ming.wu@...el.com,
        yixin.zhu@...ux.intel.com, cheol.yong.kim@...el.com,
        rtanwar <rahul.tanwar@...el.com>
Subject: Re: [PATCH v5 2/2] clk: intel: Add CGU clock driver for a new SoC

On 2/18/20 11:40 PM, Rahul Tanwar wrote:
> From: rtanwar <rahul.tanwar@...el.com>
> 
> Clock Generation Unit(CGU) is a new clock controller IP of a forthcoming
> Intel network processor SoC named Lightning Mountain(LGM). It provides
> programming interfaces to control & configure all CPU & peripheral clocks.
> Add common clock framework based clock controller driver for CGU.
> 
> Signed-off-by: Rahul Tanwar <rahul.tanwar@...ux.intel.com>
> ---
>  drivers/clk/Kconfig           |   1 +
>  drivers/clk/x86/Kconfig       |   8 +
>  drivers/clk/x86/Makefile      |   1 +
>  drivers/clk/x86/clk-cgu-pll.c | 156 +++++++++++
>  drivers/clk/x86/clk-cgu.c     | 636 ++++++++++++++++++++++++++++++++++++++++++
>  drivers/clk/x86/clk-cgu.h     | 335 ++++++++++++++++++++++
>  drivers/clk/x86/clk-lgm.c     | 492 ++++++++++++++++++++++++++++++++
>  7 files changed, 1629 insertions(+)
>  create mode 100644 drivers/clk/x86/Kconfig
>  create mode 100644 drivers/clk/x86/clk-cgu-pll.c
>  create mode 100644 drivers/clk/x86/clk-cgu.c
>  create mode 100644 drivers/clk/x86/clk-cgu.h
>  create mode 100644 drivers/clk/x86/clk-lgm.c
> 
> diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
> index bcb257baed06..43dab257e7aa 100644
> --- a/drivers/clk/Kconfig
> +++ b/drivers/clk/Kconfig
> @@ -360,6 +360,7 @@ source "drivers/clk/sunxi-ng/Kconfig"
>  source "drivers/clk/tegra/Kconfig"
>  source "drivers/clk/ti/Kconfig"
>  source "drivers/clk/uniphier/Kconfig"
> +source "drivers/clk/x86/Kconfig"
>  source "drivers/clk/zynqmp/Kconfig"
>  
>  endmenu

Hi,

> diff --git a/drivers/clk/x86/Kconfig b/drivers/clk/x86/Kconfig
> new file mode 100644
> index 000000000000..2e2b9730541f
> --- /dev/null
> +++ b/drivers/clk/x86/Kconfig
> @@ -0,0 +1,8 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +config CLK_LGM_CGU
> +	depends on (OF && HAS_IOMEM) || COMPILE_TEST

This "depends on" looks problematic to me. I guess we shall see when
all the build bots get to it.

> +	select OF_EARLY_FLATTREE

If OF is not set and HAS_IOMEM is not set, but COMPILE_TEST is set,
I expect that this should not be attempting to select OF_EARLY_FLATTREE.

Have you tried such a config combination?

> +	bool "Clock driver for Lightning Mountain(LGM) platform"
> +	help
> +	  Clock Generation Unit(CGU) driver for Intel Lightning Mountain(LGM)
> +	  network processor SoC.
thanks.
-- 
~Randy