linux-kernel - Re: [PATCH] clk: lan966x: Depend on CONFIG

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Date:   Thu, 24 Feb 2022 16:53:02 -0800
From:   Stephen Boyd <sboyd@...nel.org>
To:     David Gow <davidgow@...gle.com>,
        Michael Turquette <mturquette@...libre.com>
Cc:     David Gow <davidgow@...gle.com>, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-um@...ts.infradead.org
Subject: Re: [PATCH] clk: lan966x: Depend on CONFIG_IOMEM

Quoting David Gow (2022-02-23 19:59:02)
> The lan966x clk driver depends on IOMEM functions, in particular
> devm_platform_ioremap_resource(), but doesn't state a formal dependency
> on it in Kconfig.
> 
> Add such a dependency, which prevents this driver from being enabled
> on UML configurations without IOMEM.
> 
> This fixes the following build failure:
> 
> /usr/bin/ld: drivers/clk/clk-lan966x.o: in function `lan966x_clk_probe':
> clk-lan966x.c:(.text+0x294): undefined reference to `devm_platform_ioremap_resource'
> /usr/bin/ld: clk-lan966x.c:(.text+0x3aa): undefined reference to `devm_ioremap_resource'
> collect2: error: ld returned 1 exit status
> 
> Signed-off-by: David Gow <davidgow@...gle.com>
> ---
>  drivers/clk/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
> index 3cdf33470a75..7b5db8a9eb4f 100644
> --- a/drivers/clk/Kconfig
> +++ b/drivers/clk/Kconfig
> @@ -231,6 +231,7 @@ config COMMON_CLK_GEMINI
>  
>  config COMMON_CLK_LAN966X
>         bool "Generic Clock Controller driver for LAN966X SoC"
> +       depends on IOMEM

What is CONFIG_IOMEM? This is superseded by
https://lore.kernel.org/r/20220219141536.460812-1-horatiu.vultur@microchip.com

>         help
>           This driver provides support for Generic Clock Controller(GCK) on
>           LAN966X SoC. GCK generates and supplies clock to various peripherals