linux-kernel - Re: [PATCH] usb: usb251xb: add boost-up property support

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Message-ID: <Ye5PUpp9eMX9jSRe@ltleri2>
Date:   Mon, 24 Jan 2022 07:03:57 +0000
From:   Richard Leitner - SKIDATA <Richard.Leitner@...data.com>
To:     Tommaso Merciai <tomm.merciai@...il.com>
CC:     "linuxfancy@...glegroups.com" <linuxfancy@...glegroups.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "richard.leitner@...ux.dev" <richard.leitner@...ux.dev>
Subject: Re: [PATCH] usb: usb251xb: add boost-up property support

Hi Tommaso,

thanks for implementing the boost up register.

On Sat, Jan 22, 2022 at 12:26:12AM +0100, Tommaso Merciai wrote:
> Add u8 property to support boost-up register of usb251xb hub.
> boost-up property control USB electrical drive strenght
> This register can be set:
> 
>  - Normal mode -> 0x00
>  - Low         -> 0x01
>  - Medium      -> 0x10
>  - High        -> 0x11
> 
> (Normal Default)
> 
> References:
>  - http://www.mouser.com/catalog/specsheets/2514.pdf p29
> 
> Signed-off-by: Tommaso Merciai <tomm.merciai@...il.com>
> ---
>  drivers/usb/misc/usb251xb.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/misc/usb251xb.c b/drivers/usb/misc/usb251xb.c
> index 507deef1f709..74fd8ac0c303 100644
> --- a/drivers/usb/misc/usb251xb.c
> +++ b/drivers/usb/misc/usb251xb.c
> @@ -402,6 +402,7 @@ static int usb251xb_get_ofdata(struct usb251xb *hub,
>  	struct device_node *np = dev->of_node;
>  	int len, err;
>  	u32 property_u32 = 0;
> +	u8 property_u8 = 0;
>  	const char *cproperty_char;
>  	char str[USB251XB_STRING_BUFSIZE / 2];
>  
> @@ -543,6 +544,12 @@ static int usb251xb_get_ofdata(struct usb251xb *hub,
>  	if (of_property_read_u16_array(np, "language-id", &hub->lang_id, 1))
>  		hub->lang_id = USB251XB_DEF_LANGUAGE_ID;
>  
> +	if (!of_property_read_u8(np, "boost-up", &property_u8)){
> +		hub->boost_up = property_u8;

IMHO we don't need the property_u8 var here as you could pass
&hub->boost_up directly to of_property_read_u8() ?

regards;rl