linux-kernel - Re: [PATCH v2 08/10] usb: phy: tegra: Use u32 for hardware register variables

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Date:   Mon, 23 Dec 2019 00:48:09 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Dejin Zheng <zhengdejin5@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Peter Chen <Peter.Chen@....com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Felipe Balbi <balbi@...nel.org>, devicetree@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 08/10] usb: phy: tegra: Use u32 for hardware register
 variables

22.12.2019 16:24, Dejin Zheng пишет:
> On Fri, Dec 20, 2019 at 04:52:36AM +0300, Dmitry Osipenko wrote:
>> There is a mix of u32/ULONG usage in the driver's code. Let's switch to
>> u32 uniformly, for consistency.
>>
>> Suggested-by: Thierry Reding <thierry.reding@...il.com>
>> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
>> ---
>>  drivers/usb/phy/phy-tegra-usb.c | 28 +++++++++++++++-------------
>>  1 file changed, 15 insertions(+), 13 deletions(-)
>>
>> diff --git a/drivers/usb/phy/phy-tegra-usb.c b/drivers/usb/phy/phy-tegra-usb.c
>> index d5739b6e0b6c..551c94e3877a 100644
>> --- a/drivers/usb/phy/phy-tegra-usb.c
>> +++ b/drivers/usb/phy/phy-tegra-usb.c
>> @@ -202,7 +202,7 @@ static inline struct tegra_usb_phy *to_tegra_usb_phy(struct usb_phy *u_phy)
>>  static void set_pts(struct tegra_usb_phy *phy, u8 pts_val)
>>  {
>>  	void __iomem *base = phy->regs;
>> -	unsigned long val;
>> +	u32 val;
>>  
>>  	if (phy->soc_config->has_hostpc) {
>>  		val = readl_relaxed(base + TEGRA_USB_HOSTPC1_DEVLC);
>> @@ -221,7 +221,7 @@ static void set_pts(struct tegra_usb_phy *phy, u8 pts_val)
>>  static void set_phcd(struct tegra_usb_phy *phy, bool enable)
>>  {
>>  	void __iomem *base = phy->regs;
>> -	unsigned long val;
>> +	u32 val;
>>  
>>  	if (phy->soc_config->has_hostpc) {
>>  		val = readl_relaxed(base + TEGRA_USB_HOSTPC1_DEVLC);
>> @@ -320,7 +320,8 @@ static int utmip_pad_power_on(struct tegra_usb_phy *phy)
>>  {
>>  	struct tegra_utmip_config *config = phy->config;
>>  	void __iomem *base = phy->pad_regs;
>> -	unsigned long val, flags;
>> +	unsigned long flags;
>> +	u32 val;
> Why are you still using unsigned long here?

Please take a look at [1][2], the types are matching callees.

[1]
https://elixir.bootlin.com/linux/v5.5-rc2/source/include/linux/spinlock.h#L249

[2]
https://elixir.bootlin.com/linux/v5.5-rc2/source/include/asm-generic/io.h#L297