linux-kernel - Re: [PATCH v9 01/27] clk: davinci: pll: allow dev == NULL

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Message-ID: <7f968fd3-eb0e-37ba-9f2d-2b948640ef73@ti.com>
Date:   Tue, 1 May 2018 18:57:53 +0530
From:   Sekhar Nori <nsekhar@...com>
To:     David Lechner <david@...hnology.com>, <linux-clk@...r.kernel.org>,
        <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
CC:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Kevin Hilman <khilman@...nel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Adam Ford <aford173@...il.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v9 01/27] clk: davinci: pll: allow dev == NULL

On Friday 27 April 2018 05:47 AM, David Lechner wrote:
> This modifies the TI DaVinci PLL clock driver to allow for the case
> when dev == NULL. On some (most) SoCs that use this driver, the PLL
> clock needs to be registered during early boot because it is used
> for clocksource/clockevent and there will be no platform device available.
> 
> Signed-off-by: David Lechner <david@...hnology.com>

> diff --git a/drivers/clk/davinci/pll.c b/drivers/clk/davinci/pll.c
> index 23a24c944f1d..7c4d808b8fdb 100644
> --- a/drivers/clk/davinci/pll.c
> +++ b/drivers/clk/davinci/pll.c
> @@ -111,6 +111,31 @@ struct davinci_pll_clk {
>  #define to_davinci_pll_clk(_hw) \
>  	container_of((_hw), struct davinci_pll_clk, hw)
>  
> +static inline void *_devm_kzalloc(struct device *dev, size_t size, gfp_t flags)
> +{
> +	if (dev)
> +		return devm_kzalloc(dev, size, flags);
> +
> +	return kzalloc(size, flags);

I would shift to using kzalloc() only. The utility of devm_kzalloc() is
gone if you cannot always rely on it since you have to handle the free
for the other case. Same thing for other devres APIs below.

> +}
> +
> +static inline void *_devm_kmalloc_array(struct device *dev, size_t n,
> +					size_t size, gfp_t flags)
> +{
> +	if (dev)
> +		return devm_kmalloc_array(dev, n, size, flags);
> +
> +	return kmalloc_array(n, size, flags);
> +}
> +
> +static inline struct clk *_devm_clk_register(struct device *dev, struct clk_hw *hw)
> +{
> +	if (dev)
> +		return devm_clk_register(dev, hw);
> +
> +	return clk_register(NULL, hw);
> +}
> +


> diff --git a/drivers/clk/davinci/pll.h b/drivers/clk/davinci/pll.h
> index b1b6fb23f972..92a0978a7d29 100644
> --- a/drivers/clk/davinci/pll.h
> +++ b/drivers/clk/davinci/pll.h
> @@ -11,6 +11,7 @@
>  #include <linux/bitops.h>
>  #include <linux/clk-provider.h>
>  #include <linux/of.h>
> +#include <linux/regmap.h>
>  #include <linux/types.h>
>  
>  #define PLL_HAS_CLKMODE			BIT(0) /* PLL has PLLCTL[CLKMODE] */
> @@ -94,7 +95,8 @@ struct davinci_pll_obsclk_info {
>  struct clk *davinci_pll_clk_register(struct device *dev,
>  				     const struct davinci_pll_clk_info *info,
>  				     const char *parent_name,
> -				     void __iomem *base);
> +				     void __iomem *base,
> +				     struct regmap *cfgchip);
>  struct clk *davinci_pll_auxclk_register(struct device *dev,
>  					const char *name,
>  					void __iomem *base);
> @@ -110,32 +112,33 @@ davinci_pll_sysclk_register(struct device *dev,
>  			    const struct davinci_pll_sysclk_info *info,
>  			    void __iomem *base);
>  
> -int of_davinci_pll_init(struct device *dev,
> +int of_davinci_pll_init(struct device *dev, struct device_node *node,
>  			const struct davinci_pll_clk_info *info,
>  			const struct davinci_pll_obsclk_info *obsclk_info,
>  			const struct davinci_pll_sysclk_info **div_info,
>  			u8 max_sysclk_id,
> -			void __iomem *base);
> +			void __iomem *base,
> +			struct regmap *cfgchip);
>  
>  /* Platform-specific callbacks */
>  
> -int da830_pll_init(struct device *dev, void __iomem *base);
> +int da830_pll_init(struct device *dev, void __iomem *base, struct regmap *cfgchip);
>  
> -int da850_pll0_init(struct device *dev, void __iomem *base);
> -int da850_pll1_init(struct device *dev, void __iomem *base);
> -int of_da850_pll0_init(struct device *dev, void __iomem *base);
> -int of_da850_pll1_init(struct device *dev, void __iomem *base);
> +int da850_pll0_init(struct device *dev, void __iomem *base, struct regmap *cfgchip);

Having this declared both here and in include/linux/clk/davinci.h is
strange. Can we include that file directly where its needed?

> diff --git a/include/linux/clk/davinci.h b/include/linux/clk/davinci.h
> new file mode 100644
> index 000000000000..1298cca509ac
> --- /dev/null
> +++ b/include/linux/clk/davinci.h
> @@ -0,0 +1,24 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Clock driver for TI Davinci PSC controllers

PSC/PLL controllers.

Thanks,
Sekhar