linux-kernel - Re: [PATCH v2 2/2] phy: mediatek: tphy: add debugfs files

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Message-ID: <6dbfaee8-8c72-85b5-495d-dcb62f18c154@collabora.com>
Date:   Thu, 6 Oct 2022 16:54:42 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Vinod Koul <vkoul@...nel.org>
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-phy@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Eddie Hung <eddie.hung@...iatek.com>,
        Tianping Fang <tianping.fang@...iatek.com>
Subject: Re: [PATCH v2 2/2] phy: mediatek: tphy: add debugfs files

Il 06/10/22 16:42, Chunfeng Yun ha scritto:
> On Thu, 2022-09-29 at 11:02 +0200, AngeloGioacchino Del Regno wrote:
>> Il 29/09/22 10:09, Chunfeng Yun ha scritto:
>>> These debugfs files are mainly used to make eye diagram test
>>> easier,
>>> especially helpful to do HQA test for a new IC without efuse
>>> enabled.
>>>
>>> Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
>>> ---
>>> v2: add CONFIG_PHY_MTK_TPHY_DEBUGFS suggested by AngeloGioacchino
>>> ---
>>>    drivers/phy/mediatek/Kconfig        |   5 +
>>>    drivers/phy/mediatek/phy-mtk-tphy.c | 403
>>> +++++++++++++++++++++++++++-
>>>    2 files changed, 407 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/phy/mediatek/Kconfig
>>> b/drivers/phy/mediatek/Kconfig
>>> index 3125ecb5d119..e9fdfe9f519f 100644
>>> --- a/drivers/phy/mediatek/Kconfig
>>> +++ b/drivers/phy/mediatek/Kconfig
>>> @@ -27,6 +27,11 @@ config PHY_MTK_TPHY
>>>    	  multi-ports is first version, otherwise is second version,
>>>    	  so you can easily distinguish them by banks layout.
>>>    
>>> +config PHY_MTK_TPHY_DEBUGFS
>>> +	bool "Add T-PHY Debugfs Files"
>>> +	help
>>> +	  Say Y here to add debugfs files mainly for T-PHY HQA test.
>>> +
>>>    config PHY_MTK_UFS
>>>    	tristate "MediaTek UFS M-PHY driver"
>>>    	depends on ARCH_MEDIATEK || COMPILE_TEST
>>> diff --git a/drivers/phy/mediatek/phy-mtk-tphy.c
>>> b/drivers/phy/mediatek/phy-mtk-tphy.c
>>> index e906a82791bd..d9509e1314a4 100644
>>> --- a/drivers/phy/mediatek/phy-mtk-tphy.c
>>> +++ b/drivers/phy/mediatek/phy-mtk-tphy.c
>>> @@ -7,6 +7,7 @@
>>>    
>>>    #include <dt-bindings/phy/phy.h>
>>>    #include <linux/clk.h>
>>> +#include <linux/debugfs.h>
>>>    #include <linux/delay.h>
>>>    #include <linux/iopoll.h>
>>>    #include <linux/mfd/syscon.h>
>>> @@ -264,6 +265,8 @@
>>>    
>>>    #define TPHY_CLKS_CNT	2
>>>    
>>> +#define USER_BUF_LEN(count) min_t(size_t, 8, (count))
>>> +
>>>    enum mtk_phy_version {
>>>    	MTK_PHY_V1 = 1,
>>>    	MTK_PHY_V2,
>>> @@ -310,6 +313,7 @@ struct mtk_phy_instance {
>>>    	struct clk_bulk_data clks[TPHY_CLKS_CNT];
>>>    	u32 index;
>>>    	u32 type;
>>> +	struct dentry *dbgfs;
>>
>> Unused when !IS_ENABLED(CONFIG_PHY_MTK_TPHY_DEBUGFS)
> Yes, it will be NULL.
> 

I was meaning that you should ifdef that out...

Regards,
Angelo

>>
>>>    	struct regmap *type_sw;
>>>    	u32 type_sw_reg;
>>>    	u32 type_sw_index;
>>> @@ -332,10 +336,389 @@ struct mtk_tphy {
>>>    	const struct mtk_phy_pdata *pdata;
>>>    	struct mtk_phy_instance **phys;
>>>    	int nphys;
>>> +	struct dentry *dbgfs_root;
>>
>> Same here
>>
>>>    	int src_ref_clk; /* MHZ, reference clock for slew rate
>>> calibrate */
>>>    	int src_coef; /* coefficient for slew rate calibrate */
>>>    };
>>>    
>>> +#if IS_ENABLED(CONFIG_PHY_MTK_TPHY_DEBUGFS)
>>> +
>>
>> ..snip..
>>
>>> +
>>> +static void tphy_debufs_init(struct mtk_tphy *tphy, struct
>>> mtk_phy_instance *inst)
>>
>> Please fix typo "debufs" -> "debugfs",
> Will fix it, thanks a lot
> 
>> here and everywhere else.
>>
>> Apart from that, it looks good to me.
>>
>> Regards,
>> Angelo
> 

-- 
AngeloGioacchino Del Regno
Software Engineer

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