linux-kernel - Re: [PATCH] thermal: imx: add NVMEM dependency

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Message-ID: <1505818394.29684.13.camel@nxp.com>
Date:   Tue, 19 Sep 2017 13:53:14 +0300
From:   Leonard Crestez <leonard.crestez@....com>
To:     Arnd Bergmann <arnd@...db.de>, Zhang Rui <rui.zhang@...el.com>,
        "Eduardo Valentin" <edubezval@...il.com>
CC:     Shawn Guo <shawnguo@...nel.org>, <linux-pm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] thermal: imx: add NVMEM dependency

On Mon, 2017-09-18 at 22:48 +0200, Arnd Bergmann wrote:
> The driver now fails to link into vmlinux when CONFIG_NVMEM is a loadable
> module:
> 
> drivers/thermal/imx_thermal.o: In function `imx_thermal_probe':
> imx_thermal.c:(.text+0x360): undefined reference to
> `nvmem_cell_read_u32'
> imx_thermal.c:(.text+0x360): relocation truncated to fit:
> R_AARCH64_CALL26 against undefined symbol `nvmem_cell_read_u32'
> imx_thermal.c:(.text+0x388): undefined reference to
> `nvmem_cell_read_u32'
> imx_thermal.c:(.text+0x388): relocation truncated to fit:
> R_AARCH64_CALL26 against undefined symbol `nvmem_cell_read_u32'
> 
> This adds a Kconfig dependency to force it to be a module as well
> when its dependency is loadable.

This must be a very strange config with NVMEM=m and IMX_THERMAL=y on
arm64. Still, it makes sense that it should work at least at the
Kconfig level.

> Fixes: 7fe5ba04fcdc ("thermal: imx: Add support for reading OCOTP through nvmem")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Leonard Crestez <leonard.crestez@....com>

> diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
> index 07002df4f83a..cb14f1ec5953 100644
> --- a/drivers/thermal/Kconfig
> +++ b/drivers/thermal/Kconfig
> @@ -206,6 +206,7 @@ config HISI_THERMAL
>  config IMX_THERMAL
>  	tristate "Temperature sensor driver for Freescale i.MX SoCs"
>  	depends on (ARCH_MXC && CPU_THERMAL) || COMPILE_TEST
> +	depends on NVMEM || !NVMEM

The || !NVMEM part is so that it also works when NVMEM=n, right?