linux-kernel - Re: [PATCH v14 13/19] leds: lp55xx: Add multicolor framework support to lp55xx

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Message-ID: <bfcae4c2-aa4d-8460-528f-6029d7a87b4d@gmail.com>
Date:   Fri, 25 Oct 2019 20:13:05 +0200
From:   Jacek Anaszewski <jacek.anaszewski@...il.com>
To:     Dan Murphy <dmurphy@...com>, pavel@....cz
Cc:     linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v14 13/19] leds: lp55xx: Add multicolor framework support
 to lp55xx

Dan,

On 10/25/19 7:57 PM, Dan Murphy wrote:
> Jacek
> 
> On 10/22/19 12:41 PM, Jacek Anaszewski wrote:
>> Dan,
>>
>> On 10/22/19 6:37 PM, Dan Murphy wrote:
>>> Jacek
>>>
>>> On 10/18/19 4:56 PM, Jacek Anaszewski wrote:
>>>> On 10/18/19 11:48 PM, Jacek Anaszewski wrote:
>>>>> Dan,
>>>> +        ret = lp5xx_parse_channel_child(child, cfg, i);
>>>>> I went into details of this parsing and finally came up with
>>>>> the code which is a bit greater in size, but IMHO cleaner.
>>>>> Note changes in variable naming. It is not even compile-tested.
>>>>>
>>>>> static int lp55xx_parse_common_child(struct device_node *np,
>>>>>                                       struct lp55xx_led_config *cfg,
>>>>>                                       int led_number, int *chan_nr)
>>>>> {
>>>>>           int ret;
>>>>>
>>>>>           of_property_read_string(np, "chan-name",
>>>>>                                   &cfg[led_number].name);
>>>>>           of_property_read_u8(np, "led-cur",
>>>>>                               &cfg[led_number].led_current);
>>>>>           of_property_read_u8(np, "max-cur",
>>>>>                               &cfg[led_number].max_current);
>>>>>
>>>>>           ret = of_property_read_u32(np, "reg", chan_nr);
>>>>>           if (ret)
>>>>>                   return ret;
>>>>>
>>>>>           if (chan_nr < 0 || chan_nr > cfg->max_chan_nr) /* side note:
>>>>> new
>>>>> max_chan_nr property needed in cfg */
>>>>>                   return -EINVAL;
>>>>>
>>>>>           return 0;
>>>>> }
>>>>>
>>>>> static int lp55xx_parse_mutli_led_child(struct device_node *np,
>>>>>                                           struct lp55xx_led_config
>>>>> *cfg,
>>>>>                                           int child_number,
>>>>>                                           int color_number)
>>>>> {
>>>>>           int chan_nr, color_id;
>>>>>
>>>>>           ret = lp55xx_parse_common_child(child, cfg, child_number,
>>>>> color_number,
>>>>>                                           &chan_nr);
>>>>>           if (ret)
>>>>>                   return ret;
>>>>>
>>>>>           ret = of_property_read_u32(child, "color", &color_id);
>>>>>           if (ret)
>>>>>                  return ret;
>>>>>
>>>>>           cfg[child_number].color_components[color_number].color_id =
>>>>> color_id;
>>>>>          
>>>>> cfg[child_number].color_components[color_number].output_num =
>>>>> chan_nr;
>>>>>           set_bit(color_id, &cfg[child_number].available_colors);
>>>>>
>>>>>           return 0;
>>>>> }
>>>>>
>>>>> staitc int lp55xx_parse_mutli_led(struct device_node *np,
>>>>>                                     struct lp55xx_led_config *cfg,
>>>>>                                     int child_number)
>>>>> {
>>>>>           struct device_node *child;
>>>>>           int num_colors = 0, i = 0;
>>>> s/, i = 0//
>>>>
>>>>>           for_each_child_of_node(np, child) {
>>>>>                   ret = lp55xx_parse_mutli_led_child(child, cfg,
>>>>> num_colors,
>>>>>                                                      child_number, i))
>>>> Replace above call with below:
>>>>
>>>> ret = lp55xx_parse_mutli_led_child(child, cfg, child_number,
>>>> num_colors);
>>>>
>>> I applied your DT parser patch from the v13 series.  Which eliminates
>>> this comment correct?
>> Yes, it contains this fix.
>>
> OK I added your patch and it broke a lot of the DT parsing for the LP55xx.
> 
> I would prefer to stick with the original code without having to
> re-write this again.

Let me test that with Qemu first.

-- 
Best regards,
Jacek Anaszewski