linux-kernel - Re: [PATCH 1/2] phy: phy-rockchip-samsung-hdptx: annotate regmap register-callback

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Message-ID: <7081d3ec-1a7f-48d9-a20d-7518445ed5bd@collabora.com>
Date: Fri, 6 Dec 2024 19:54:50 +0200
From: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
To: Heiko Stübner <heiko@...ech.de>, vkoul@...nel.org,
 kishon@...nel.org
Cc: linux-phy@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org,
 linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
 quentin.schulz@...rry.de, Heiko Stuebner <heiko.stuebner@...rry.de>
Subject: Re: [PATCH 1/2] phy: phy-rockchip-samsung-hdptx: annotate regmap
 register-callback

On 12/6/24 7:36 PM, Heiko Stübner wrote:
> Am Freitag, 6. Dezember 2024, 12:18:56 CET schrieb Cristian Ciocaltea:
>> On 12/6/24 12:34 PM, Heiko Stuebner wrote:
>>> From: Heiko Stuebner <heiko.stuebner@...rry.de>
>>>
>>> The variant of the driver in the vendor-tree contained those handy
>>> comments in the regmap register callback. Having the different ranges
>>> describe what they are looks helpful.
>>>
>>> Signed-off-by: Heiko Stuebner <heiko.stuebner@...rry.de>
>>> ---
>>>  drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c | 14 +++++++-------
>>>  1 file changed, 7 insertions(+), 7 deletions(-)
>>>
>>> diff --git a/drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c b/drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c
>>> index 4ced1479e2dc..c5c64c209e96 100644
>>> --- a/drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c
>>> +++ b/drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c
>>> @@ -766,13 +766,13 @@ static struct tx_drv_ctrl tx_drv_ctrl_hbr2[4][4] = {
>>>  static bool rk_hdptx_phy_is_rw_reg(struct device *dev, unsigned int reg)
>>>  {
>>>  	switch (reg) {
>>> -	case 0x0000 ... 0x029c:
>>> -	case 0x0400 ... 0x04a4:
>>> -	case 0x0800 ... 0x08a4:
>>> -	case 0x0c00 ... 0x0cb4:
>>> -	case 0x1000 ... 0x10b4:
>>> -	case 0x1400 ... 0x14b4:
>>> -	case 0x1800 ... 0x18b4:
>>> +	case 0x0000 ... 0x029c: /* CMN Register */
>>> +	case 0x0400 ... 0x04a4: /* Sideband Register */
>>> +	case 0x0800 ... 0x08a4: /* Lane Top Register */
>>> +	case 0x0c00 ... 0x0cb4: /* Lane 0 Register */
>>> +	case 0x1000 ... 0x10b4: /* Lane 1 Register */
>>> +	case 0x1400 ... 0x14b4: /* Lane 2 Register */
>>> +	case 0x1800 ... 0x18b4: /* Lane 3 Register */
>>>  		return true;
>>>  	}
>>>  
>>
>> Nice finding!  The HDMI variant of the driver which I used as an
>> implementation reference (i.e. phy-rockchip-samsung-hdptx-hdmi.c)
>> doesn't provide these comments.
> 
> yep, those comments were in the displayport variant of the phy-driver ;-) .
> I don't really understand why the vendor tree contains 2 separate drivers

Yeah, I asked myself the same question a while ago - I'd assume the
(initial) development happened in parallel, but the final sync/merge was
never done.

> written by two different people, but at least it looks like we're getting
> one driver in mainline, thanks to Damon's work :-)

Indeed, we're eventually getting there.. :-)