linux-kernel - Re: [PATCH] clk: meson: remove obsolete register access

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Date:   Wed, 20 Jun 2018 10:31:56 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Jerome Brunet <jbrunet@...libre.com>,
        Kevin Hilman <khilman@...libre.com>,
        Carlo Caione <carlo@...one.org>
Cc:     linux-amlogic@...ts.infradead.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: meson: remove obsolete register access

On 19/06/2018 18:00, Jerome Brunet wrote:
> The legacy method to access the hhi register space is not longer used.
> We can safely drop it now.
> 
> Signed-off-by: Jerome Brunet <jbrunet@...libre.com>
> ---
>  drivers/clk/meson/axg.c  | 37 ++-----------------------------------
>  drivers/clk/meson/gxbb.c | 36 ++----------------------------------
>  2 files changed, 4 insertions(+), 69 deletions(-)
> 
> diff --git a/drivers/clk/meson/axg.c b/drivers/clk/meson/axg.c
> index bd4dbc696b88..3fb884db1b10 100644
> --- a/drivers/clk/meson/axg.c
> +++ b/drivers/clk/meson/axg.c
> @@ -12,7 +12,6 @@
>  #include <linux/clk.h>
>  #include <linux/clk-provider.h>
>  #include <linux/init.h>
> -#include <linux/of_address.h>
>  #include <linux/of_device.h>
>  #include <linux/mfd/syscon.h>
>  #include <linux/platform_device.h>
> @@ -995,49 +994,17 @@ static const struct of_device_id clkc_match_table[] = {
>  	{}
>  };
>  
> -static const struct regmap_config clkc_regmap_config = {
> -	.reg_bits       = 32,
> -	.val_bits       = 32,
> -	.reg_stride     = 4,
> -};
> -
>  static int axg_clkc_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
> -	struct resource *res;
> -	void __iomem *clk_base = NULL;
>  	struct regmap *map;
>  	int ret, i;
>  
>  	/* Get the hhi system controller node if available */
>  	map = syscon_node_to_regmap(of_get_parent(dev->of_node));
>  	if (IS_ERR(map)) {
> -		dev_err(dev,
> -			"failed to get HHI regmap - Trying obsolete regs\n");
> -
> -		/*
> -		 * FIXME: HHI registers should be accessed through
> -		 * the appropriate system controller. This is required because
> -		 * there is more than just clocks in this register space
> -		 *
> -		 * This fallback method is only provided temporarily until
> -		 * all the platform DTs are properly using the syscon node
> -		 */
> -		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -		if (!res)
> -			return -EINVAL;
> -
> -
> -		clk_base = devm_ioremap(dev, res->start, resource_size(res));
> -		if (!clk_base) {
> -			dev_err(dev, "Unable to map clk base\n");
> -			return -ENXIO;
> -		}
> -
> -		map = devm_regmap_init_mmio(dev, clk_base,
> -					    &clkc_regmap_config);
> -		if (IS_ERR(map))
> -			return PTR_ERR(map);
> +		dev_err(dev, "failed to get HHI regmap\n");
> +		return PTR_ERR(map);
>  	}
>  
>  	/* Populate regmap for the regmap backed clocks */
> diff --git a/drivers/clk/meson/gxbb.c b/drivers/clk/meson/gxbb.c
> index 177fffb9ebef..297ebc391475 100644
> --- a/drivers/clk/meson/gxbb.c
> +++ b/drivers/clk/meson/gxbb.c
> @@ -7,7 +7,6 @@
>  #include <linux/clk.h>
>  #include <linux/clk-provider.h>
>  #include <linux/init.h>
> -#include <linux/of_address.h>
>  #include <linux/of_device.h>
>  #include <linux/mfd/syscon.h>
>  #include <linux/platform_device.h>
> @@ -2228,17 +2227,9 @@ static const struct of_device_id clkc_match_table[] = {
>  	{},
>  };
>  
> -static const struct regmap_config clkc_regmap_config = {
> -	.reg_bits       = 32,
> -	.val_bits       = 32,
> -	.reg_stride     = 4,
> -};
> -
>  static int gxbb_clkc_probe(struct platform_device *pdev)
>  {
>  	const struct clkc_data *clkc_data;
> -	struct resource *res;
> -	void __iomem *clk_base;
>  	struct regmap *map;
>  	int ret, i;
>  	struct device *dev = &pdev->dev;
> @@ -2250,31 +2241,8 @@ static int gxbb_clkc_probe(struct platform_device *pdev)
>  	/* Get the hhi system controller node if available */
>  	map = syscon_node_to_regmap(of_get_parent(dev->of_node));
>  	if (IS_ERR(map)) {
> -		dev_err(dev,
> -			"failed to get HHI regmap - Trying obsolete regs\n");
> -
> -		/*
> -		 * FIXME: HHI registers should be accessed through
> -		 * the appropriate system controller. This is required because
> -		 * there is more than just clocks in this register space
> -		 *
> -		 * This fallback method is only provided temporarily until
> -		 * all the platform DTs are properly using the syscon node
> -		 */
> -		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -		if (!res)
> -			return -EINVAL;
> -
> -		clk_base = devm_ioremap(dev, res->start, resource_size(res));
> -		if (!clk_base) {
> -			dev_err(dev, "Unable to map clk base\n");
> -			return -ENXIO;
> -		}
> -
> -		map = devm_regmap_init_mmio(dev, clk_base,
> -					    &clkc_regmap_config);
> -		if (IS_ERR(map))
> -			return PTR_ERR(map);
> +		dev_err(dev, "failed to get HHI regmap\n");
> +		return PTR_ERR(map);
>  	}
>  
>  	/* Populate regmap for the common regmap backed clocks */
> 

Acked-by: Neil Armstrong <narmstrong@...libre.com>