linux-kernel - Re: [PATCH v2] usb: usb251xb: add boost-up property support

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Message-ID: <978bc09c-b963-566b-8fa4-a53f1e5c569b@gmail.com>
Date:   Sat, 29 Jan 2022 13:32:21 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...il.com>
To:     Tommaso Merciai <tomm.merciai@...il.com>
Cc:     linuxfancy@...glegroups.com,
        Richard Leitner <richard.leitner@...data.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] usb: usb251xb: add boost-up property support

Hello again!

On 1/28/22 2:14 AM, Tommaso Merciai wrote:

> Add u8 property to support boost-up register of usb251xb hub.
> boost-up property control USB electrical drive strenght

   Strength.

> 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>
> ---
> Changes since v1:
>  - Fix patch as suggested by RLeitner
> 
>  drivers/usb/misc/usb251xb.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/misc/usb251xb.c b/drivers/usb/misc/usb251xb.c
> index 507deef1f709..b60ab148e6ac 100644
> --- a/drivers/usb/misc/usb251xb.c
> +++ b/drivers/usb/misc/usb251xb.c
> @@ -543,6 +543,8 @@ 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;
>  
> +	of_property_read_u8(np, "boost-up", &hub->boost_up))

   Isn't it hub->boost_up left uninitialized if an error occurs here?

[...]

MBR, Sergey