linux-kernel - Re: [PATCH] pinctrl: meson: fix G12A ao pull registers base address

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Message-ID: <b3ccafc4-0bd2-273b-b0b2-96bbdeb9ee1b@amlogic.com>
Date:   Tue, 4 Dec 2018 10:05:00 +0800
From:   Xingyu Chen <xingyu.chen@...ogic.com>
To:     Neil Armstrong <narmstrong@...libre.com>,
        <linus.walleij@...aro.org>, <linux-gpio@...r.kernel.org>
CC:     <jbrunet@...libre.com>, <khilman@...libre.com>, <carlo@...one.org>,
        <martin.blumenstingl@...glemail.com>, <robh@...nel.org>,
        <jianxin.pan@...ogic.com>, <linux-amlogic@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] pinctrl: meson: fix G12A ao pull registers base address



On 2018/12/3 18:27, Neil Armstrong wrote:
> Hi Xingyu,
> 
> 
> On 03/12/2018 04:05, Xingyu Chen wrote:
>> Since Meson G12A SoC, Introduce new ao registers AO_RTI_PULL_UP_EN_REG
>> and AO_GPIO_O.
>>
>> These bits of controlling output level are remapped to the new register
>> AO_GPIO_O, and the AO_GPIO_O_EN_N support only controlling output enable.
>>
>> These bits of controlling pull enable are remapped to the new register
>> AO_RTI_PULL_UP_EN_REG, and the AO_RTI_PULL_UP_REG support only controlling
>> pull type(up/down).
>>
>> The new layout of ao gpio/pull registers is as follows:
>> - AO_GPIO_O_EN_N        [offset: 0x9 << 2]
>> - AO_GPIO_I             [offset: 0xa << 2]
>> - AO_RTI_PULL_UP_REG    [offset: 0xb << 2]
>> - AO_RTI_PULL_UP_EN_REG [offset: 0xc << 2]
>> - AO_GPIO_O             [offset: 0xd << 2]
>>
>>  From above, we can see ao GPIO registers region has been separated by the
>> ao pull registers. In order to ensure the continuity of the region on
>> software, the ao GPIO and ao pull registers use the same base address, but
>> can be identified by the offset.
>>
>> Fixes: 29ae0952e85f ("pinctrl: meson-g12a: add pinctrl driver support")
>> Signed-off-by: Xingyu Chen <xingyu.chen@...ogic.com>
>> Signed-off-by: Jianxin Pan <jianxin.pan@...ogic.com>
>> ---
>>   drivers/pinctrl/meson/pinctrl-meson.c | 22 ++++++++++++----------
>>   1 file changed, 12 insertions(+), 10 deletions(-)
>>
>> diff --git a/drivers/pinctrl/meson/pinctrl-meson.c b/drivers/pinctrl/meson/pinctrl-meson.c
>> index 53d449076dee..7ff40cd7a0cb 100644
>> --- a/drivers/pinctrl/meson/pinctrl-meson.c
>> +++ b/drivers/pinctrl/meson/pinctrl-meson.c
>> @@ -31,6 +31,9 @@
>>    * In some cases the register ranges for pull enable and pull
>>    * direction are the same and thus there are only 3 register ranges.
>>    *
>> + * Since Meson G12A SoC, the ao register ranges for gpio, pull enable
>> + * and pull direction are the same, so there are only 2 register ranges.
>> + *
>>    * For the pull and GPIO configuration every bank uses a contiguous
>>    * set of bits in the register sets described above; the same register
>>    * can be shared by more banks with different offsets.
>> @@ -487,23 +490,22 @@ static int meson_pinctrl_parse_dt(struct meson_pinctrl *pc,
>>   		return PTR_ERR(pc->reg_mux);
>>   	}
>>   
>> -	pc->reg_pull = meson_map_resource(pc, gpio_np, "pull");
>> -	if (IS_ERR(pc->reg_pull)) {
>> -		dev_err(pc->dev, "pull registers not found\n");
>> -		return PTR_ERR(pc->reg_pull);
>> +	pc->reg_gpio = meson_map_resource(pc, gpio_np, "gpio");
>> +	if (IS_ERR(pc->reg_gpio)) {
>> +		dev_err(pc->dev, "gpio registers not found\n");
>> +		return PTR_ERR(pc->reg_gpio);
>>   	}
>>   
>> +	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_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_gpio = meson_map_resource(pc, gpio_np, "gpio");
>> -	if (IS_ERR(pc->reg_gpio)) {
>> -		dev_err(pc->dev, "gpio registers not found\n");
>> -		return PTR_ERR(pc->reg_gpio);
>> -	}
>> -
>>   	return 0;
>>   }
>>   
>>
> Doesn't it need an update of the bindings ?
> 
> Neil
> 
Thanks, I will update it in next patch
> .
>