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From:   Heiko =?ISO-8859-1?Q?St=FCbner?= <heiko@sntech.de>
To:     linus.walleij@linaro.org, Jianqun Xu <jay.xu@rock-chips.com>
Cc:     linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-rockchip@lists.infradead.org,
        Jianqun Xu <jay.xu@rock-chips.com>
Subject: Re: [PATCH] pinctrl: rockchip: populate platform device for rockchip gpio
Date:   Mon, 21 Sep 2020 00:16:20 +0200
Message-ID: <10672745.BqqIlaXAsm@diego>
In-Reply-To: <20200908021913.21556-1-jay.xu@rock-chips.com>
References: <20200907033808.10211-1-jay.xu@rock-chips.com> <20200908021913.21556-1-jay.xu@rock-chips.com>
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Precedence: bulk

Am Dienstag, 8. September 2020, 04:19:13 CEST schrieb Jianqun Xu:
> Register both gpio driver and device as part of driver model, so that
> the '-gpio'/'-gpios' dependency in dts can be correctly handled by
> of_devlink/of_fwlink.
> 
> Signed-off-by: Jianqun Xu <jay.xu@rock-chips.com>

Reviewed-by: Heiko Stuebner <heiko@sntech.de>

> ---
>  drivers/pinctrl/pinctrl-rockchip.c | 305 +++++++++++++++++------------
>  1 file changed, 175 insertions(+), 130 deletions(-)
> 
> diff --git a/drivers/pinctrl/pinctrl-rockchip.c b/drivers/pinctrl/pinctrl-rockchip.c
> index c98bd352f831..2e4fc711d0d1 100644
> --- a/drivers/pinctrl/pinctrl-rockchip.c
> +++ b/drivers/pinctrl/pinctrl-rockchip.c
> @@ -3370,139 +3370,121 @@ static void rockchip_irq_disable(struct irq_data *d)
>  }
>  
>  static int rockchip_interrupts_register(struct platform_device *pdev,
> -						struct rockchip_pinctrl *info)
> +						struct rockchip_pin_bank *bank)
>  {
> -	struct rockchip_pin_ctrl *ctrl = info->ctrl;
> -	struct rockchip_pin_bank *bank = ctrl->pin_banks;
>  	unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
>  	struct irq_chip_generic *gc;
>  	int ret;
> -	int i;
>  
> -	for (i = 0; i < ctrl->nr_banks; ++i, ++bank) {
> -		if (!bank->valid) {
> -			dev_warn(&pdev->dev, "bank %s is not valid\n",
> -				 bank->name);
> -			continue;
> -		}
> +	if (!bank->valid) {
> +		dev_warn(&pdev->dev, "bank %s is not valid\n",
> +			 bank->name);
> +		return -EINVAL;
> +	}
>  
> -		ret = clk_enable(bank->clk);
> -		if (ret) {
> -			dev_err(&pdev->dev, "failed to enable clock for bank %s\n",
> -				bank->name);
> -			continue;
> -		}
> +	ret = clk_enable(bank->clk);
> +	if (ret) {
> +		dev_err(&pdev->dev, "failed to enable clock for bank %s\n",
> +			bank->name);
> +		return ret;
> +	}
>  
> -		bank->domain = irq_domain_add_linear(bank->of_node, 32,
> -						&irq_generic_chip_ops, NULL);
> -		if (!bank->domain) {
> -			dev_warn(&pdev->dev, "could not initialize irq domain for bank %s\n",
> -				 bank->name);
> -			clk_disable(bank->clk);
> -			continue;
> -		}
> +	bank->domain = irq_domain_add_linear(bank->of_node, 32,
> +					&irq_generic_chip_ops, NULL);
> +	if (!bank->domain) {
> +		dev_warn(&pdev->dev, "could not initialize irq domain for bank %s\n",
> +			 bank->name);
> +		clk_disable(bank->clk);
> +		return -EINVAL;
> +	}
>  
> -		ret = irq_alloc_domain_generic_chips(bank->domain, 32, 1,
> -					 "rockchip_gpio_irq", handle_level_irq,
> -					 clr, 0, 0);
> -		if (ret) {
> -			dev_err(&pdev->dev, "could not alloc generic chips for bank %s\n",
> -				bank->name);
> -			irq_domain_remove(bank->domain);
> -			clk_disable(bank->clk);
> -			continue;
> -		}
> +	ret = irq_alloc_domain_generic_chips(bank->domain, 32, 1,
> +				 "rockchip_gpio_irq", handle_level_irq,
> +				 clr, 0, 0);
> +	if (ret) {
> +		dev_err(&pdev->dev, "could not alloc generic chips for bank %s\n",
> +			bank->name);
> +		irq_domain_remove(bank->domain);
> +		clk_disable(bank->clk);
> +		return ret;
> +	}
>  
> -		gc = irq_get_domain_generic_chip(bank->domain, 0);
> -		gc->reg_base = bank->reg_base;
> -		gc->private = bank;
> -		gc->chip_types[0].regs.mask = GPIO_INTMASK;
> -		gc->chip_types[0].regs.ack = GPIO_PORTS_EOI;
> -		gc->chip_types[0].chip.irq_ack = irq_gc_ack_set_bit;
> -		gc->chip_types[0].chip.irq_mask = irq_gc_mask_set_bit;
> -		gc->chip_types[0].chip.irq_unmask = irq_gc_mask_clr_bit;
> -		gc->chip_types[0].chip.irq_enable = rockchip_irq_enable;
> -		gc->chip_types[0].chip.irq_disable = rockchip_irq_disable;
> -		gc->chip_types[0].chip.irq_set_wake = irq_gc_set_wake;
> -		gc->chip_types[0].chip.irq_suspend = rockchip_irq_suspend;
> -		gc->chip_types[0].chip.irq_resume = rockchip_irq_resume;
> -		gc->chip_types[0].chip.irq_set_type = rockchip_irq_set_type;
> -		gc->wake_enabled = IRQ_MSK(bank->nr_pins);
> +	gc = irq_get_domain_generic_chip(bank->domain, 0);
> +	gc->reg_base = bank->reg_base;
> +	gc->private = bank;
> +	gc->chip_types[0].regs.mask = GPIO_INTMASK;
> +	gc->chip_types[0].regs.ack = GPIO_PORTS_EOI;
> +	gc->chip_types[0].chip.irq_ack = irq_gc_ack_set_bit;
> +	gc->chip_types[0].chip.irq_mask = irq_gc_mask_set_bit;
> +	gc->chip_types[0].chip.irq_unmask = irq_gc_mask_clr_bit;
> +	gc->chip_types[0].chip.irq_enable = rockchip_irq_enable;
> +	gc->chip_types[0].chip.irq_disable = rockchip_irq_disable;
> +	gc->chip_types[0].chip.irq_set_wake = irq_gc_set_wake;
> +	gc->chip_types[0].chip.irq_suspend = rockchip_irq_suspend;
> +	gc->chip_types[0].chip.irq_resume = rockchip_irq_resume;
> +	gc->chip_types[0].chip.irq_set_type = rockchip_irq_set_type;
> +	gc->wake_enabled = IRQ_MSK(bank->nr_pins);
>  
> -		/*
> -		 * Linux assumes that all interrupts start out disabled/masked.
> -		 * Our driver only uses the concept of masked and always keeps
> -		 * things enabled, so for us that's all masked and all enabled.
> -		 */
> -		writel_relaxed(0xffffffff, bank->reg_base + GPIO_INTMASK);
> -		writel_relaxed(0xffffffff, bank->reg_base + GPIO_INTEN);
> -		gc->mask_cache = 0xffffffff;
> +	/*
> +	 * Linux assumes that all interrupts start out disabled/masked.
> +	 * Our driver only uses the concept of masked and always keeps
> +	 * things enabled, so for us that's all masked and all enabled.
> +	 */
> +	writel_relaxed(0xffffffff, bank->reg_base + GPIO_INTMASK);
> +	writel_relaxed(0xffffffff, bank->reg_base + GPIO_INTEN);
> +	gc->mask_cache = 0xffffffff;
>  
> -		irq_set_chained_handler_and_data(bank->irq,
> -						 rockchip_irq_demux, bank);
> -		clk_disable(bank->clk);
> -	}
> +	irq_set_chained_handler_and_data(bank->irq,
> +					 rockchip_irq_demux, bank);
> +	clk_disable(bank->clk);
>  
>  	return 0;
>  }
>  
>  static int rockchip_gpiolib_register(struct platform_device *pdev,
> -						struct rockchip_pinctrl *info)
> +						struct rockchip_pin_bank *bank)
>  {
> -	struct rockchip_pin_ctrl *ctrl = info->ctrl;
> -	struct rockchip_pin_bank *bank = ctrl->pin_banks;
>  	struct gpio_chip *gc;
>  	int ret;
> -	int i;
>  
> -	for (i = 0; i < ctrl->nr_banks; ++i, ++bank) {
> -		if (!bank->valid) {
> -			dev_warn(&pdev->dev, "bank %s is not valid\n",
> -				 bank->name);
> -			continue;
> -		}
> +	if (!bank->valid) {
> +		dev_err(&pdev->dev, "bank %s is not valid\n", bank->name);
> +		return -EINVAL;
> +	}
>  
> -		bank->gpio_chip = rockchip_gpiolib_chip;
> +	bank->gpio_chip = rockchip_gpiolib_chip;
>  
> -		gc = &bank->gpio_chip;
> -		gc->base = bank->pin_base;
> -		gc->ngpio = bank->nr_pins;
> -		gc->parent = &pdev->dev;
> -		gc->of_node = bank->of_node;
> -		gc->label = bank->name;
> +	gc = &bank->gpio_chip;
> +	gc->base = bank->pin_base;
> +	gc->ngpio = bank->nr_pins;
> +	gc->parent = &pdev->dev;
> +	gc->of_node = bank->of_node;
> +	gc->label = bank->name;
>  
> -		ret = gpiochip_add_data(gc, bank);
> -		if (ret) {
> -			dev_err(&pdev->dev, "failed to register gpio_chip %s, error code: %d\n",
> -							gc->label, ret);
> -			goto fail;
> -		}
> +	ret = gpiochip_add_data(gc, bank);
> +	if (ret) {
> +		dev_err(&pdev->dev, "failed to register %s (%d)\n", gc->label, ret);
> +		return ret;
>  	}
>  
> -	rockchip_interrupts_register(pdev, info);
> +	if (!of_property_read_bool(bank->of_node, "gpio-ranges")) {
> +		struct device *parent = pdev->dev.parent;
> +		struct rockchip_pinctrl *info = dev_get_drvdata(parent);
> +		struct pinctrl_dev *pctldev;
>  
> -	return 0;
> +		if (!info)
> +			return -ENODATA;
>  
> -fail:
> -	for (--i, --bank; i >= 0; --i, --bank) {
> -		if (!bank->valid)
> -			continue;
> -		gpiochip_remove(&bank->gpio_chip);
> -	}
> -	return ret;
> -}
> -
> -static int rockchip_gpiolib_unregister(struct platform_device *pdev,
> -						struct rockchip_pinctrl *info)
> -{
> -	struct rockchip_pin_ctrl *ctrl = info->ctrl;
> -	struct rockchip_pin_bank *bank = ctrl->pin_banks;
> -	int i;
> +		pctldev = info->pctl_dev;
> +		if (!pctldev)
> +			return -ENODEV;
>  
> -	for (i = 0; i < ctrl->nr_banks; ++i, ++bank) {
> -		if (!bank->valid)
> -			continue;
> -		gpiochip_remove(&bank->gpio_chip);
> +		ret = gpiochip_add_pin_range(gc, dev_name(pctldev->dev), 0, gc->base, gc->ngpio);
> +		if (ret) {
> +			dev_err(&pdev->dev, "Failed to add pin range\n");
> +			gpiochip_remove(&bank->gpio_chip);
> +			return ret;
> +		}
>  	}
>  
>  	return 0;
> @@ -3571,7 +3553,6 @@ static struct rockchip_pin_ctrl *rockchip_pinctrl_get_soc_data(
>  {
>  	const struct of_device_id *match;
>  	struct device_node *node = pdev->dev.of_node;
> -	struct device_node *np;
>  	struct rockchip_pin_ctrl *ctrl;
>  	struct rockchip_pin_bank *bank;
>  	int grf_offs, pmu_offs, drv_grf_offs, drv_pmu_offs, i, j;
> @@ -3579,23 +3560,6 @@ static struct rockchip_pin_ctrl *rockchip_pinctrl_get_soc_data(
>  	match = of_match_node(rockchip_pinctrl_dt_match, node);
>  	ctrl = (struct rockchip_pin_ctrl *)match->data;
>  
> -	for_each_child_of_node(node, np) {
> -		if (!of_find_property(np, "gpio-controller", NULL))
> -			continue;
> -
> -		bank = ctrl->pin_banks;
> -		for (i = 0; i < ctrl->nr_banks; ++i, ++bank) {
> -			if (!strcmp(bank->name, np->name)) {
> -				bank->of_node = np;
> -
> -				if (!rockchip_get_bank_data(bank, d))
> -					bank->valid = true;
> -
> -				break;
> -			}
> -		}
> -	}
> -
>  	grf_offs = ctrl->grf_mux_offset;
>  	pmu_offs = ctrl->pmu_mux_offset;
>  	drv_pmu_offs = ctrl->pmu_drv_offset;
> @@ -3742,6 +3706,68 @@ static int __maybe_unused rockchip_pinctrl_resume(struct device *dev)
>  static SIMPLE_DEV_PM_OPS(rockchip_pinctrl_dev_pm_ops, rockchip_pinctrl_suspend,
>  			 rockchip_pinctrl_resume);
>  
> +static int rockchip_gpio_probe(struct platform_device *pdev)
> +{
> +	struct device_node *np = pdev->dev.of_node;
> +	struct device *parent = pdev->dev.parent;
> +	struct rockchip_pinctrl *info = dev_get_drvdata(parent);
> +	struct rockchip_pin_ctrl *ctrl = info ? (info->ctrl) : NULL;
> +	struct rockchip_pin_bank *bank;
> +	int ret, i;
> +
> +	if (!info || !ctrl)
> +		return -EINVAL;
> +
> +	if (!of_find_property(np, "gpio-controller", NULL))
> +		return -ENODEV;
> +
> +	bank = ctrl->pin_banks;
> +	for (i = 0; i < ctrl->nr_banks; ++i, ++bank) {
> +		if (!strcmp(bank->name, np->name)) {
> +			bank->of_node = np;
> +
> +			if (!rockchip_get_bank_data(bank, info))
> +				bank->valid = true;
> +
> +			break;
> +		}
> +	}
> +
> +	if (!bank->valid) {
> +		dev_info(parent, "gpio%d probed\n", bank->bank_num);
> +		return -EINVAL;
> +	}
> +
> +	bank->of_node = pdev->dev.of_node;
> +
> +	ret = rockchip_gpiolib_register(pdev, bank);
> +	if (ret)
> +		return ret;
> +
> +	ret = rockchip_interrupts_register(pdev, bank);
> +	if (ret) {
> +		gpiochip_remove(&bank->gpio_chip);
> +		return ret;
> +	}
> +
> +	platform_set_drvdata(pdev, bank);
> +	dev_info(parent, "gpio%d probed\n", bank->bank_num);
> +
> +	return 0;
> +}
> +
> +static int rockchip_gpio_remove(struct platform_device *pdev)
> +{
> +	struct rockchip_pin_bank *bank = platform_get_drvdata(pdev);
> +
> +	if (!bank)
> +		return -EINVAL;
> +
> +	gpiochip_remove(&bank->gpio_chip);
> +
> +	return 0;
> +}
> +
>  static int rockchip_pinctrl_probe(struct platform_device *pdev)
>  {
>  	struct rockchip_pinctrl *info;
> @@ -3813,17 +3839,20 @@ static int rockchip_pinctrl_probe(struct platform_device *pdev)
>  			return PTR_ERR(info->regmap_pmu);
>  	}
>  
> -	ret = rockchip_gpiolib_register(pdev, info);
> -	if (ret)
> -		return ret;
> -
>  	ret = rockchip_pinctrl_register(pdev, info);
>  	if (ret) {
> -		rockchip_gpiolib_unregister(pdev, info);
> +		dev_err(&pdev->dev, "failed to register pinctrl device\n");
>  		return ret;
>  	}
>  
>  	platform_set_drvdata(pdev, info);
> +	dev_info(&pdev->dev, "pinctrl probed\n");
> +
> +	ret = of_platform_populate(np, rockchip_bank_match, NULL, dev);
> +	if (ret) {
> +		dev_err(&pdev->dev, "failed to register gpio device\n");
> +		return ret;
> +	}
>  
>  	return 0;
>  }
> @@ -4244,8 +4273,17 @@ static const struct of_device_id rockchip_pinctrl_dt_match[] = {
>  	{},
>  };
>  
> +static struct platform_driver rockchip_gpio_driver = {
> +	.probe	= rockchip_gpio_probe,
> +	.remove = rockchip_gpio_remove,
> +	.driver = {
> +		.name	= "rockchip-gpio",
> +		.of_match_table = rockchip_bank_match,
> +	},
> +};
> +
>  static struct platform_driver rockchip_pinctrl_driver = {
> -	.probe		= rockchip_pinctrl_probe,
> +	.probe	= rockchip_pinctrl_probe,
>  	.driver = {
>  		.name	= "rockchip-pinctrl",
>  		.pm = &rockchip_pinctrl_dev_pm_ops,
> @@ -4255,11 +4293,18 @@ static struct platform_driver rockchip_pinctrl_driver = {
>  
>  static int __init rockchip_pinctrl_drv_register(void)
>  {
> -	return platform_driver_register(&rockchip_pinctrl_driver);
> +	int ret;
> +
> +	ret = platform_driver_register(&rockchip_pinctrl_driver);
> +	if (ret)
> +		return ret;
> +
> +	return platform_driver_register(&rockchip_gpio_driver);
>  }
>  
>  static void __exit rockchip_pinctrl_drv_unregister(void)
>  {
> +	platform_driver_unregister(&rockchip_gpio_driver);
>  	platform_driver_unregister(&rockchip_pinctrl_driver);
>  }
>  
>