linux-kernel - Re: [PATCH 02/25] serial: sh-sci: Update DT binding documentation for BRG support

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Date:	Thu, 19 Nov 2015 23:13:37 +0200
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Geert Uytterhoeven <geert+renesas@...der.be>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Simon Horman <horms@...ge.net.au>,
	Magnus Damm <magnus.damm@...il.com>,
	Yoshinori Sato <ysato@...rs.sourceforge.jp>,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
	Linux-sh list <linux-sh@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH 02/25] serial: sh-sci: Update DT binding documentation for BRG support

Hi Geert,

On Thursday 19 November 2015 21:44:27 Geert Uytterhoeven wrote:
> On Thu, Nov 19, 2015 at 9:26 PM, Laurent Pinchart wrote:
> > On Thursday 19 November 2015 19:38:41 Geert Uytterhoeven wrote:
> >> Amend the DT bindings to include the optional clock sources for the Baud
> >> Rate Generator for External Clock (BRG), as found on some SCIF variants
> >> and on HSCIF.
> >> 
> >> --- a/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt
> >> +++ b/Documentation/devicetree/bindings/serial/renesas,sci-serial.txt
> >> 
> >> @@ -46,6 +46,12 @@ Required properties:
> >>      On (H)SCI(F) and some SCIFA, an additional clock may be specified:
> >>        - "hsck" for the optional external clock input (on HSCIF),
> >>        - "sck" for the optional external clock input (on other variants).
> >> 
> >> +    On UARTs equipped with a Baud Rate Generator for External Clock
> >> (BRG)
> >> +    (some SCIF and HSCIF), additional clocks may be specified:
> >> +      - "int_clk" for the optional internal clock source for the
> >> frequency
> >> +     divider (typically the (AXI or SHwy) bus clock),
> > 
> > Isn't this always the same clock as the SCIF functional clock ?
> 
> (On R-Car Gen2/3)
> 
> No, SCIF uses different parents for fck (p) and int_clk (zs).

Right, my bad.

Should we rename "int_clk" to something that makes it explicit that the clock 
is used as the BRG-EC input ? Maybe brg_clk, int_brg, int_brg_clk ? We 
probably don't need to keep the _clk suffix as it's quite evident that a clock 
name refers to a clock.

> HSCIF uses the same parents though (zs).

-- 
Regards,

Laurent Pinchart

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