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Subject: Re: [PATCH v5 1/3] pinctrl: meson: add a new callback for SoCs fixup
To:     Qianggui Song <qianggui.song@amlogic.com>,
        Linus Walleij <linus.walleij@linaro.org>,
        linux-gpio@vger.kernel.org
Cc:     Jerome Brunet <jbrunet@baylibre.com>,
        Kevin Hilman <khilman@baylibre.com>,
        Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
        Carlo Caione <carlo@caione.org>,
        Rob Herring <robh+dt@kernel.org>,
        Xingyu Chen <xingyu.chen@amlogic.com>,
        Jianxin Pan <jianxin.pan@amlogic.com>,
        Hanjie Lin <hanjie.lin@amlogic.com>,
        Mark Rutland <mark.rutland@arm.com>,
        linux-arm-kernel@lists.infradead.org,
        linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org
References: <1573203636-7436-1-git-send-email-qianggui.song@amlogic.com>
 <1573203636-7436-2-git-send-email-qianggui.song@amlogic.com>
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Organization: Baylibre
Message-ID: <54809378-d4b0-2013-eb22-d6570eff2a8c@baylibre.com>
Date:   Fri, 8 Nov 2019 13:50:28 +0100
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In-Reply-To: <1573203636-7436-2-git-send-email-qianggui.song@amlogic.com>
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Sender: linux-kernel-owner@vger.kernel.org
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Hi,

On 08/11/2019 10:00, Qianggui Song wrote:
> In meson_pinctrl_parse_dt, it contains two parts: reg parsing and
> SoC relative fixup for AO. Several fixups in the same code make it hard
> to maintain, so move all fixups to each SoC's callback and make
> meson_pinctrl_parse_dt just do the reg parsing, separate these two
> parts.Overview of all current Meson SoCs fixup is as below:
> 
> +------+--------------------------------------+--------------------------+
> |      |                                      |                          |
> | SoC  |                EE domain             |        AO domain         |
> +------+--------------------------------------+--------------------------+
> |m8    | parse regs:                          | parse regs:              |
> |m8b   |   gpio,mux,pull,pull-enable(skip ds) |    gpio,mux,pull(skip ds)|
> |gxl   | fixup:                               | fixup:                   |
> |gxbb  |   no                                 |     pull-enable = pull;  |
> |axg   |                                      |                          |
> +------+--------------------------------------+--------------------------+
> |g12a  | parse regs:                          | parse regs:              |
> |sm1   |   gpio,mux,pull,pull-enable,ds       |   gpio,mux,ds            |
> |      | fixup:                               | fixup:                   |
> |      |   no                                 |   pull = gpio;           |
> |      |                                      |   pull-enable = gpio;    |
> +------+--------------------------------------+--------------------------+
> |a1 or | parse regs:                                                     |
> |later |  gpio/mux (without ao domain)                                   |
> |SoCs  | fixup:                                                          |
> |      |  pull = gpio; pull-enable = gpio; ds = gpio;                    |
> +------+-----------------------------------------------------------------+
> Since m8-axg share the same ao fixup, make a common function
> meson8_aobus_parse_dt_extra to do the job.
> 
> Signed-off-by: Qianggui Song <qianggui.song@amlogic.com>
> ---
>  drivers/pinctrl/meson/pinctrl-meson-axg.c  |  1 +
>  drivers/pinctrl/meson/pinctrl-meson-g12a.c |  9 +++++++++
>  drivers/pinctrl/meson/pinctrl-meson-gxbb.c |  1 +
>  drivers/pinctrl/meson/pinctrl-meson-gxl.c  |  1 +
>  drivers/pinctrl/meson/pinctrl-meson.c      | 25 ++++++++++++++++++-------
>  drivers/pinctrl/meson/pinctrl-meson.h      |  5 +++++
>  drivers/pinctrl/meson/pinctrl-meson8.c     |  1 +
>  drivers/pinctrl/meson/pinctrl-meson8b.c    |  1 +
>  8 files changed, 37 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/pinctrl/meson/pinctrl-meson-axg.c b/drivers/pinctrl/meson/pinctrl-meson-axg.c
> index ad502eda4afa..072765db93d7 100644
> --- a/drivers/pinctrl/meson/pinctrl-meson-axg.c
> +++ b/drivers/pinctrl/meson/pinctrl-meson-axg.c
> @@ -1066,6 +1066,7 @@
>  	.num_banks	= ARRAY_SIZE(meson_axg_aobus_banks),
>  	.pmx_ops	= &meson_axg_pmx_ops,
>  	.pmx_data	= &meson_axg_aobus_pmx_banks_data,
> +	.parse_dt	= meson8_aobus_parse_dt_extra,
>  };
>  
>  static const struct of_device_id meson_axg_pinctrl_dt_match[] = {
> diff --git a/drivers/pinctrl/meson/pinctrl-meson-g12a.c b/drivers/pinctrl/meson/pinctrl-meson-g12a.c
> index 582665fd362a..41850e3c0091 100644
> --- a/drivers/pinctrl/meson/pinctrl-meson-g12a.c
> +++ b/drivers/pinctrl/meson/pinctrl-meson-g12a.c
> @@ -1362,6 +1362,14 @@
>  	.num_pmx_banks	= ARRAY_SIZE(meson_g12a_aobus_pmx_banks),
>  };
>  
> +static int meson_g12a_aobus_parse_dt_extra(struct meson_pinctrl *pc)
> +{
> +	pc->reg_pull = pc->reg_gpio;
> +	pc->reg_pullen = pc->reg_gpio;
> +
> +	return 0;
> +}
> +
>  static struct meson_pinctrl_data meson_g12a_periphs_pinctrl_data = {
>  	.name		= "periphs-banks",
>  	.pins		= meson_g12a_periphs_pins,
> @@ -1388,6 +1396,7 @@
>  	.num_banks	= ARRAY_SIZE(meson_g12a_aobus_banks),
>  	.pmx_ops	= &meson_axg_pmx_ops,
>  	.pmx_data	= &meson_g12a_aobus_pmx_banks_data,
> +	.parse_dt	= meson_g12a_aobus_parse_dt_extra,
>  };
>  
>  static const struct of_device_id meson_g12a_pinctrl_dt_match[] = {
> diff --git a/drivers/pinctrl/meson/pinctrl-meson-gxbb.c b/drivers/pinctrl/meson/pinctrl-meson-gxbb.c
> index 5bfa56f3847e..926b9997159a 100644
> --- a/drivers/pinctrl/meson/pinctrl-meson-gxbb.c
> +++ b/drivers/pinctrl/meson/pinctrl-meson-gxbb.c
> @@ -851,6 +851,7 @@
>  	.num_funcs	= ARRAY_SIZE(meson_gxbb_aobus_functions),
>  	.num_banks	= ARRAY_SIZE(meson_gxbb_aobus_banks),
>  	.pmx_ops	= &meson8_pmx_ops,
> +	.parse_dt	= meson8_aobus_parse_dt_extra,
>  };
>  
>  static const struct of_device_id meson_gxbb_pinctrl_dt_match[] = {
> diff --git a/drivers/pinctrl/meson/pinctrl-meson-gxl.c b/drivers/pinctrl/meson/pinctrl-meson-gxl.c
> index 72c5373c8dc1..8b1a49f5da43 100644
> --- a/drivers/pinctrl/meson/pinctrl-meson-gxl.c
> +++ b/drivers/pinctrl/meson/pinctrl-meson-gxl.c
> @@ -820,6 +820,7 @@
>  	.num_funcs	= ARRAY_SIZE(meson_gxl_aobus_functions),
>  	.num_banks	= ARRAY_SIZE(meson_gxl_aobus_banks),
>  	.pmx_ops	= &meson8_pmx_ops,
> +	.parse_dt 	= meson8_aobus_parse_dt_extra,
>  };
>  
>  static const struct of_device_id meson_gxl_pinctrl_dt_match[] = {
> diff --git a/drivers/pinctrl/meson/pinctrl-meson.c b/drivers/pinctrl/meson/pinctrl-meson.c
> index 8bba9d053d9f..a812c6d986d9 100644
> --- a/drivers/pinctrl/meson/pinctrl-meson.c
> +++ b/drivers/pinctrl/meson/pinctrl-meson.c
> @@ -625,7 +625,7 @@ static struct regmap *meson_map_resource(struct meson_pinctrl *pc,
>  
>  	i = of_property_match_string(node, "reg-names", name);
>  	if (of_address_to_resource(node, i, &res))
> -		return ERR_PTR(-ENOENT);
> +		return NULL;
>  
>  	base = devm_ioremap_resource(pc->dev, &res);
>  	if (IS_ERR(base))
> @@ -665,26 +665,24 @@ static int meson_pinctrl_parse_dt(struct meson_pinctrl *pc,
>  	pc->of_node = gpio_np;
>  
>  	pc->reg_mux = meson_map_resource(pc, gpio_np, "mux");
> -	if (IS_ERR(pc->reg_mux)) {
> +	if (IS_ERR_OR_NULL(pc->reg_mux)) {
>  		dev_err(pc->dev, "mux registers not found\n");
>  		return PTR_ERR(pc->reg_mux);

If pc->reg_mux is NULL, it will return "0" here, which is wrong.

Either keep the return ERR_PTR(-ENOENT); in meson_map_resource, or
	return pc->reg_mux ? -ENOENT : PTR_ERR(pc->reg_mux);

>  	}
>  
>  	pc->reg_gpio = meson_map_resource(pc, gpio_np, "gpio");
> -	if (IS_ERR(pc->reg_gpio)) {
> +	if (IS_ERR_OR_NULL(pc->reg_gpio)) {
>  		dev_err(pc->dev, "gpio registers not found\n");
>  		return PTR_ERR(pc->reg_gpio);

Ditto

>  	}
>  
>  	pc->reg_pull = meson_map_resource(pc, gpio_np, "pull");
> -	/* Use gpio region if pull one is not present */
>  	if (IS_ERR(pc->reg_pull))
> -		pc->reg_pull = pc->reg_gpio;
> +		pc->reg_pull = NULL;
>  
>  	pc->reg_pullen = meson_map_resource(pc, gpio_np, "pull-enable");
> -	/* Use pull region if pull-enable one is not present */
>  	if (IS_ERR(pc->reg_pullen))
> -		pc->reg_pullen = pc->reg_pull;
> +		pc->reg_pullen = NULL;
>  
>  	pc->reg_ds = meson_map_resource(pc, gpio_np, "ds");
>  	if (IS_ERR(pc->reg_ds)) {
> @@ -692,6 +690,19 @@ static int meson_pinctrl_parse_dt(struct meson_pinctrl *pc,
>  		pc->reg_ds = NULL;
>  	}
>  
> +	if (pc->data->parse_dt)
> +		return pc->data->parse_dt(pc);
> +
> +	return 0;
> +}
> +
> +int meson8_aobus_parse_dt_extra(struct meson_pinctrl *pc)
> +{
> +	if (!pc->reg_pull)
> +		return -EINVAL;
> +
> +	pc->reg_pullen = pc->reg_pull;
> +
>  	return 0;
>  }
>  
> diff --git a/drivers/pinctrl/meson/pinctrl-meson.h b/drivers/pinctrl/meson/pinctrl-meson.h
> index c696f3241a36..bfa1d3599333 100644
> --- a/drivers/pinctrl/meson/pinctrl-meson.h
> +++ b/drivers/pinctrl/meson/pinctrl-meson.h
> @@ -11,6 +11,8 @@
>  #include <linux/regmap.h>
>  #include <linux/types.h>
>  
> +struct meson_pinctrl;
> +
>  /**
>   * struct meson_pmx_group - a pinmux group
>   *
> @@ -114,6 +116,7 @@ struct meson_pinctrl_data {
>  	unsigned int num_banks;
>  	const struct pinmux_ops *pmx_ops;
>  	void *pmx_data;
> +	int (*parse_dt)(struct meson_pinctrl *pc);
>  };
>  
>  struct meson_pinctrl {
> @@ -171,3 +174,5 @@ int meson_pmx_get_groups(struct pinctrl_dev *pcdev,
>  
>  /* Common probe function */
>  int meson_pinctrl_probe(struct platform_device *pdev);
> +/* Common ao groups extra dt parse function for SoCs before g12a  */
> +int meson8_aobus_parse_dt_extra(struct meson_pinctrl *pc);
> diff --git a/drivers/pinctrl/meson/pinctrl-meson8.c b/drivers/pinctrl/meson/pinctrl-meson8.c
> index 0b97befa6335..dd17100efdcf 100644
> --- a/drivers/pinctrl/meson/pinctrl-meson8.c
> +++ b/drivers/pinctrl/meson/pinctrl-meson8.c
> @@ -1103,6 +1103,7 @@
>  	.num_funcs	= ARRAY_SIZE(meson8_aobus_functions),
>  	.num_banks	= ARRAY_SIZE(meson8_aobus_banks),
>  	.pmx_ops	= &meson8_pmx_ops,
> +	.parse_dt	= &meson8_aobus_parse_dt_extra,
>  };
>  
>  static const struct of_device_id meson8_pinctrl_dt_match[] = {
> diff --git a/drivers/pinctrl/meson/pinctrl-meson8b.c b/drivers/pinctrl/meson/pinctrl-meson8b.c
> index a7de388388e6..2d5339edd0b7 100644
> --- a/drivers/pinctrl/meson/pinctrl-meson8b.c
> +++ b/drivers/pinctrl/meson/pinctrl-meson8b.c
> @@ -962,6 +962,7 @@
>  	.num_funcs	= ARRAY_SIZE(meson8b_aobus_functions),
>  	.num_banks	= ARRAY_SIZE(meson8b_aobus_banks),
>  	.pmx_ops	= &meson8_pmx_ops,
> +	.parse_dt	= &meson8_aobus_parse_dt_extra,
>  };
>  
>  static const struct of_device_id meson8b_pinctrl_dt_match[] = {
>