linux-kernel - Re: Re: [PATCH v5 5/7] gpio/rockchip: support next version gpio controller

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Message-ID: <202106181436485250639@rock-chips.com>
Date:   Fri, 18 Jun 2021 14:36:48 +0800
From:   "jay.xu@...k-chips.com" <jay.xu@...k-chips.com>
To:     Heiko Stübner <heiko@...ech.de>,
        "Linus Walleij" <linus.walleij@...aro.org>,
        robh+dt <robh+dt@...nel.org>
Cc:     "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: Re: [PATCH v5 5/7] gpio/rockchip: support next version gpio controller

Hi Heiko

--------------
jay.xu@...k-chips.com
>Am Donnerstag, 27. Mai 2021, 09:13:45 CEST schrieb Jianqun Xu:
>> The next version gpio controller on SoCs like rk3568 have more write
>> mask bits for registers.
>>
>> Signed-off-by: Jianqun Xu <jay.xu@...k-chips.com>
>
>> @@ -549,15 +677,33 @@ static int rockchip_get_bank_data(struct rockchip_pin_bank *bank)
>>  return PTR_ERR(bank->reg_base);
>> 
>>  bank->irq = irq_of_parse_and_map(bank->of_node, 0);
>> -
>> -	bank->gpio_regs = &gpio_regs_v1;
>> -	bank->gpio_type = GPIO_TYPE_V1;
>> +	if (!bank->irq)
>> +	return -EINVAL;
>> 
>>  bank->clk = of_clk_get(bank->of_node, 0);
>> -	if (!IS_ERR(bank->clk))
>> -	return clk_prepare(bank->clk);
>> +	if (IS_ERR(bank->clk))
>> +	return PTR_ERR(bank->clk);
>> +
>> +	clk_prepare_enable(bank->clk);
>> +	id = readl(bank->reg_base + gpio_regs_v2.version_id);
>> +
>> +	/* If not gpio v2, that is default to v1. */
>> +	if (id == GPIO_TYPE_V2) {
>> +	bank->gpio_regs = &gpio_regs_v2;
>> +	bank->gpio_type = GPIO_TYPE_V2;
>> +	bank->db_clk = of_clk_get(bank->of_node, 1);
>> +	if (IS_ERR(bank->db_clk)) {
>> +	dev_err(bank->dev, "cannot find debounce clk\n");
>> +	bank->db_clk = NULL;
>> +	clk_disable(bank->clk);
>> +	return -EINVAL;
>> +	}
>> +	} else {
>> +	bank->gpio_regs = &gpio_regs_v1;
>> +	bank->gpio_type = GPIO_TYPE_V1;
>> +	}
>> 
>> -	bank->clk = NULL;
>> +	clk_disable(bank->clk);
>
>NIT: you could move the "always enable clock for gpio controller" patch
>before adding the v2 support. That way you save on not needing to add
>the clock handling here.
> 
V6 has reoder the patches, I havn't add acked-by or reviewed-by yet, please take a look again, thanks

>Otherwise looks nice to me.
>
>Acked-by: Heiko Stuebner <heiko@...ech.de>
>
>
>Heiko
>
>
>>  return 0;
>>  }
>> 
>> diff --git a/drivers/pinctrl/pinctrl-rockchip.h b/drivers/pinctrl/pinctrl-rockchip.h
>> index 1b774b6bbc3e..589d4d2a98c9 100644
>> --- a/drivers/pinctrl/pinctrl-rockchip.h
>> +++ b/drivers/pinctrl/pinctrl-rockchip.h
>> @@ -121,6 +121,7 @@ struct rockchip_drv {
>>   * @reg_base: register base of the gpio bank
>>   * @regmap_pull: optional separate register for additional pull settings
>>   * @clk: clock of the gpio bank
>> + * @db_clk: clock of the gpio debounce
>>   * @irq: interrupt of the gpio bank
>>   * @saved_masks: Saved content of GPIO_INTEN at suspend time.
>>   * @pin_base: first pin number
>> @@ -146,6 +147,7 @@ struct rockchip_pin_bank {
>>  void __iomem	*reg_base;
>>  struct regmap	*regmap_pull;
>>  struct clk	*clk;
>> +	struct clk	*db_clk;
>>  int	irq;
>>  u32	saved_masks;
>>  u32	pin_base;
>>
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