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SubjectRe: [PATCH 9/9] clk: davinci: Fix link errors when not all SoCs are enabled
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On Friday 25 May 2018 11:41 PM, David Lechner wrote:
> This fixes linker errors due to undefined symbols when one or more of
> the TI DaVinci SoCs is not enabled in the kernel config.
>
> Signed-off-by: David Lechner <david@lechnology.com>
> ---
> drivers/clk/davinci/pll.c | 16 ++++++++++++++++
> drivers/clk/davinci/pll.h | 11 ++++++++---
> drivers/clk/davinci/psc.c | 14 ++++++++++++++
> drivers/clk/davinci/psc.h | 12 ++++++++++++
> include/linux/clk/davinci.h | 19 +++++++++++++++----
> 5 files changed, 65 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/clk/davinci/pll.c b/drivers/clk/davinci/pll.c
> index 84a343060bc8..65abd371692d 100644
> --- a/drivers/clk/davinci/pll.c
> +++ b/drivers/clk/davinci/pll.c
> @@ -860,25 +860,41 @@ static struct davinci_pll_platform_data *davinci_pll_get_pdata(struct device *de
> }
>
> /* needed in early boot for clocksource/clockevent */
> +#ifdef CONFIG_ARCH_DAVINCI_DA850
> CLK_OF_DECLARE(da850_pll0, "ti,da850-pll0", of_da850_pll0_init);
> +#endif
>
> static const struct of_device_id davinci_pll_of_match[] = {
> +#ifdef CONFIG_ARCH_DAVINCI_DA850
> { .compatible = "ti,da850-pll1", .data = of_da850_pll1_init },
> +#endif
> { }
> };
>
> static const struct platform_device_id davinci_pll_id_table[] = {
> +#ifdef CONFIG_ARCH_DAVINCI_DA830
> { .name = "da830-pll", .driver_data = (kernel_ulong_t)da830_pll_init },
> +#endif
> +#ifdef CONFIG_ARCH_DAVINCI_DA850
> { .name = "da850-pll0", .driver_data = (kernel_ulong_t)da850_pll0_init },
> { .name = "da850-pll1", .driver_data = (kernel_ulong_t)da850_pll1_init },
> +#endif
> +#ifdef CONFIG_ARCH_DAVINCI_DM355
> { .name = "dm355-pll1", .driver_data = (kernel_ulong_t)dm355_pll1_init },
> { .name = "dm355-pll2", .driver_data = (kernel_ulong_t)dm355_pll2_init },
> +#endif
> +#ifdef CONFIG_ARCH_DAVINCI_DM365
> { .name = "dm365-pll1", .driver_data = (kernel_ulong_t)dm365_pll1_init },
> { .name = "dm365-pll2", .driver_data = (kernel_ulong_t)dm365_pll2_init },
> +#endif
> +#ifdef CONFIG_ARCH_DAVINCI_DM644x
> { .name = "dm644x-pll1", .driver_data = (kernel_ulong_t)dm644x_pll1_init },
> { .name = "dm644x-pll2", .driver_data = (kernel_ulong_t)dm644x_pll2_init },
> +#endif
> +#ifdef CONFIG_ARCH_DAVINCI_DM646x
> { .name = "dm646x-pll1", .driver_data = (kernel_ulong_t)dm646x_pll1_init },
> { .name = "dm646x-pll2", .driver_data = (kernel_ulong_t)dm646x_pll2_init },
> +#endif
> { }
> };
>
> diff --git a/drivers/clk/davinci/pll.h b/drivers/clk/davinci/pll.h
> index b2e5c4496645..7cc354dd29e2 100644
> --- a/drivers/clk/davinci/pll.h
> +++ b/drivers/clk/davinci/pll.h
> @@ -122,14 +122,19 @@ int of_davinci_pll_init(struct device *dev, struct device_node *node,
>
> /* Platform-specific callbacks */
>
> +#ifdef CONFIG_ARCH_DAVINCI_DA850
> int da850_pll1_init(struct device *dev, void __iomem *base, struct regmap *cfgchip);
> void of_da850_pll0_init(struct device_node *node);
> int of_da850_pll1_init(struct device *dev, void __iomem *base, struct regmap *cfgchip);
> -
> +#endif
> +#ifdef CONFIG_ARCH_DAVINCI_DM355
> int dm355_pll2_init(struct device *dev, void __iomem *base, struct regmap *cfgchip);
> -
> +#endif
> +#ifdef CONFIG_ARCH_DAVINCI_DM644x
> int dm644x_pll2_init(struct device *dev, void __iomem *base, struct regmap *cfgchip);
> -
> +#endif

The traditional way of dealing with this for functions is to provide a
static inline stub when CONFIG_ARCH_DAVINCI_DM644x is not defined. Can
we use that? That helps in avoiding ifdefs elsewhere.

> +#ifdef CONFIG_ARCH_DAVINCI_DM646x
> int dm646x_pll2_init(struct device *dev, void __iomem *base, struct regmap *cfgchip);
> +#endif
>
> #endif /* __CLK_DAVINCI_PLL_H___ */
> diff --git a/drivers/clk/davinci/psc.c b/drivers/clk/davinci/psc.c
> index 6326ba1fe3cc..fffbed5e263b 100644
> --- a/drivers/clk/davinci/psc.c
> +++ b/drivers/clk/davinci/psc.c
> @@ -513,20 +513,34 @@ int of_davinci_psc_clk_init(struct device *dev,
> }
>
> static const struct of_device_id davinci_psc_of_match[] = {
> +#ifdef CONFIG_ARCH_DAVINCI_DA850
> { .compatible = "ti,da850-psc0", .data = &of_da850_psc0_init_data },
> { .compatible = "ti,da850-psc1", .data = &of_da850_psc1_init_data },
> +#endif
> { }
> };
>
> static const struct platform_device_id davinci_psc_id_table[] = {
> +#ifdef CONFIG_ARCH_DAVINCI_DA830
> { .name = "da830-psc0", .driver_data = (kernel_ulong_t)&da830_psc0_init_data },
> { .name = "da830-psc1", .driver_data = (kernel_ulong_t)&da830_psc1_init_data },
> +#endif
> +#ifdef CONFIG_ARCH_DAVINCI_DA850
> { .name = "da850-psc0", .driver_data = (kernel_ulong_t)&da850_psc0_init_data },
> { .name = "da850-psc1", .driver_data = (kernel_ulong_t)&da850_psc1_init_data },
> +#endif
> +#ifdef CONFIG_ARCH_DAVINCI_DM355
> { .name = "dm355-psc", .driver_data = (kernel_ulong_t)&dm355_psc_init_data },
> +#endif
> +#ifdef CONFIG_ARCH_DAVINCI_DM365
> { .name = "dm365-psc", .driver_data = (kernel_ulong_t)&dm365_psc_init_data },
> +#endif
> +#ifdef CONFIG_ARCH_DAVINCI_DM644x
> { .name = "dm644x-psc", .driver_data = (kernel_ulong_t)&dm644x_psc_init_data },
> +#endif
> +#ifdef CONFIG_ARCH_DAVINCI_DM646x
> { .name = "dm646x-psc", .driver_data = (kernel_ulong_t)&dm646x_psc_init_data },
> +#endif
> { }
> };
>
> diff --git a/drivers/clk/davinci/psc.h b/drivers/clk/davinci/psc.h
> index c2a7df6413fe..6a42529d31a9 100644
> --- a/drivers/clk/davinci/psc.h
> +++ b/drivers/clk/davinci/psc.h
> @@ -94,15 +94,27 @@ struct davinci_psc_init_data {
> int (*psc_init)(struct device *dev, void __iomem *base);
> };
>
> +#ifdef CONFIG_ARCH_DAVINCI_DA830
> extern const struct davinci_psc_init_data da830_psc0_init_data;
> extern const struct davinci_psc_init_data da830_psc1_init_data;
> +#endif
> +#ifdef CONFIG_ARCH_DAVINCI_DA850
> extern const struct davinci_psc_init_data da850_psc0_init_data;
> extern const struct davinci_psc_init_data da850_psc1_init_data;
> extern const struct davinci_psc_init_data of_da850_psc0_init_data;
> extern const struct davinci_psc_init_data of_da850_psc1_init_data;
> +#endif
> +#ifdef CONFIG_ARCH_DAVINCI_DM355
> extern const struct davinci_psc_init_data dm355_psc_init_data;
> +#endif
> +#ifdef CONFIG_ARCH_DAVINCI_DM356
> extern const struct davinci_psc_init_data dm365_psc_init_data;
> +#endif
> +#ifdef CONFIG_ARCH_DAVINCI_DM644x
> extern const struct davinci_psc_init_data dm644x_psc_init_data;
> +#endif
> +#ifdef CONFIG_ARCH_DAVINCI_DM646x
> extern const struct davinci_psc_init_data dm646x_psc_init_data;
> +#endif

ifdefs around these extern declarations are not needed.

Thanks,
Sekhar

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