Re: [PATCH 02/10] pwm: Add SI-EN SN3112 PWM support

Neil Armstrong
2024-04-25T07:57:44Z

On 25/04/2024 02:57, Junhao Xie wrote:
> On 2024/4/25 03:37, Konrad Dybcio wrote:
>> On 4/24/24 17:29, Xilin Wu via B4 Relay wrote:
>>> From: Junhao Xie <bigfoot@classfun.cn>
>>>
>>> Add a new driver for the SI-EN SN3112 12-channel 8-bit PWM LED controller.
>>>
>>> Signed-off-by: Junhao Xie <bigfoot@classfun.cn>
>>> ---
>> [...]
>>> +    return sn3112_write_reg(priv, SN3112_REG_PWM_EN + reg,
>>> +                priv->pwm_en_reg[reg]);
>>
>> This looks like a weird reimplementation of regmap_update_bits
>>
>
> We cannot use regmap_update_bits because this chip does not support read command.
> It will discard all read command.

You could use regmap cache with all registers marked as cacheable, but not sure it's worth
doing this.

Neil

>
>>> +}
>>> +
> [...]
>>
>> devm_pwmchip_add?
>>
>> Konrad
>
> Thank you for your reply, I will fix them.
>