linux-kernel - Re: [PATCH RFC v3 4/5] phy: hisilicon: hisi-inno-phy: add support for Hi3798MV200 INNO PHY

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Date: Tue, 20 Feb 2024 05:37:43 +0800
From: Yang Xiwen <forbidden405@...look.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
 Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham I <kishon@...nel.org>,
 Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Jiancheng Xue <xuejiancheng@...ilicon.com>, Shawn Guo
 <shawn.guo@...aro.org>, Philipp Zabel <p.zabel@...gutronix.de>
Cc: linux-phy@...ts.infradead.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, Kishon Vijay Abraham I <kishon@...com>,
 David Yang <mmyangfl@...il.com>
Subject: Re: [PATCH RFC v3 4/5] phy: hisilicon: hisi-inno-phy: add support for
 Hi3798MV200 INNO PHY

On 2/20/2024 5:34 AM, Krzysztof Kozlowski wrote:
> On 19/02/2024 22:28, Yang Xiwen via B4 Relay wrote:
>> From: Yang Xiwen <forbidden405@...look.com>
>>
>> Direct MMIO resgiter access is used by Hi3798MV200. For other models,
>> of_iomap() returns 0 due to insufficient length. So they are unaffected.
>>
>> Also Hi3798MV200 INNO PHY has an extra reset required to be deasserted,
>> switch to reset_control_bulk_() APIs to resolve this.
>>
>> Signed-off-by: Yang Xiwen <forbidden405@...look.com>
>> ---
>>   drivers/phy/hisilicon/phy-hisi-inno-usb2.c | 65 ++++++++++++++++++------------
>>   1 file changed, 39 insertions(+), 26 deletions(-)
>>
>> diff --git a/drivers/phy/hisilicon/phy-hisi-inno-usb2.c b/drivers/phy/hisilicon/phy-hisi-inno-usb2.c
>> index b7e740eb4752..5175e5a351ac 100644
>> --- a/drivers/phy/hisilicon/phy-hisi-inno-usb2.c
>> +++ b/drivers/phy/hisilicon/phy-hisi-inno-usb2.c
>> @@ -10,6 +10,7 @@
>>   #include <linux/io.h>
>>   #include <linux/module.h>
>>   #include <linux/of.h>
>> +#include <linux/of_address.h>
>>   #include <linux/phy/phy.h>
>>   #include <linux/platform_device.h>
>>   #include <linux/reset.h>
>> @@ -43,6 +44,7 @@
>>   #define PHY_CLK_ENABLE		BIT(2)
>>   
>>   struct hisi_inno_phy_port {
>> +	void __iomem *base;
>>   	struct reset_control *utmi_rst;
>>   	struct hisi_inno_phy_priv *priv;
>>   };
>> @@ -50,7 +52,7 @@ struct hisi_inno_phy_port {
>>   struct hisi_inno_phy_priv {
>>   	void __iomem *mmio;
>>   	struct clk *ref_clk;
>> -	struct reset_control *por_rst;
>> +	struct reset_control *rsts;
> This does not look related to this patch at all.
I should emphasize this in commit log. Hi3798MV200 have two resets 
rather than one. To make things easier, I simply used 
reset_control_array APIs instead.
>
>>   	unsigned int type;
>>   	struct hisi_inno_phy_port ports[INNO_PHY_PORT_NUM];
>>   };
>
>
> Best regards,
> Krzysztof
>

-- 
Regards,
Yang Xiwen