linux-kernel - Re: [PATCH v11 7/7] drm/lsdc: add drm driver for loongson display controller

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Date:   Thu, 24 Mar 2022 12:05:55 +0800
From:   Sui Jingfeng <15330273260@....cn>
To:     Rob Herring <robh@...nel.org>
Cc:     Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Roland Scheidegger <sroland@...are.com>,
        Zack Rusin <zackr@...are.com>,
        Christian Gmeiner <christian.gmeiner@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Andrey Zhizhikin <andrey.zhizhikin@...ca-geosystems.com>,
        Sam Ravnborg <sam@...nborg.org>,
        "David S . Miller" <davem@...emloft.net>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Ilia Mirkin <imirkin@...m.mit.edu>,
        Qing Zhang <zhangqing@...ngson.cn>,
        suijingfeng <suijingfeng@...ngson.cn>,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH v11 7/7] drm/lsdc: add drm driver for loongson display
 controller


On 2022/3/23 21:11, Rob Herring wrote:
> On Wed, Mar 23, 2022 at 12:12:43PM +0800, Sui Jingfeng wrote:
>> On 2022/3/23 04:49, Rob Herring wrote:
>>>> +/*
>>>> + * mainly for dc in ls7a1000 which have builtin gpio emulated i2c
>>>> + *
>>>> + * @index : output channel index, 0 for DVO0, 1 for DVO1
>>>> + */
>>>> +struct lsdc_i2c *lsdc_create_i2c_chan(struct device *dev, void *base, unsigned int index)
>>>> +{
>>>> +	char compat[32] = {0};
>>>> +	unsigned int udelay = 5;
>>>> +	unsigned int timeout = 2200;
>>>> +	int nr = -1;
>>>> +	struct i2c_adapter *adapter;
>>>> +	struct lsdc_i2c *li2c;
>>>> +	struct device_node *i2c_np;
>>>> +	int ret;
>>>> +
>>>> +	li2c = devm_kzalloc(dev, sizeof(*li2c), GFP_KERNEL);
>>>> +	if (!li2c)
>>>> +		return ERR_PTR(-ENOMEM);
>>>> +
>>>> +	li2c->index = index;
>>>> +	li2c->dev = dev;
>>>> +
>>>> +	if (index == 0) {
>>>> +		li2c->sda = 0x01;
>>>> +		li2c->scl = 0x02;
>>>> +	} else if (index == 1) {
>>>> +		li2c->sda = 0x04;
>>>> +		li2c->scl = 0x08;
>>> Just require this to be in DT rather than having some default.
>>>
>> By design,  I am try very hard to let the code NOT fully  DT dependent. DT is nice , easy to learn and use.
>> But kernel side developer plan to follow UEFI + ACPI Specification on LS3A5000 + LS7A1000 platform. See [1]
>> There will no DT support then, provide a convention support  make the driver more flexible. I want the
>> driver works with minimal requirement. The driver just works on simple boards by put the following dc device
>> node in arch/mips/dts/loongson/loongson64g_4core_ls7a.dts,
> Pick DT or ACPI for the platform, not both. We don't need to have both
> in the kernel to support.
>
> Rob

Hi Rob,

We can only choose DT currently, we love DT, but it is kernel side developer's choice.
We just avoid deep coupling which tend to lost flexibility.
All I can and should do is make the drivers works, writing code beautiful does not
means it can works like a charm.

 From what i am understanding, DT is not a strict specification, but in return flexible.
Force every driver comply with what already have is tend to prohibit innovation.
It just too late to do so.