linux-kernel - Re: [PATCH v2 13/14] clk: shmobile: mstp: Consider "zb

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Date:	Mon, 22 Jun 2015 13:05:49 -0700
From:	Michael Turquette <mturquette@...aro.org>
To:	Geert Uytterhoeven <geert+renesas@...der.be>,
	"Stephen Boyd" <sboyd@...eaurora.org>,
	"Simon Horman" <horms@...ge.net.au>,
	"Magnus Damm" <magnus.damm@...il.com>,
	"Laurent Pinchart" <Laurent.pinchart@...asonboard.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"Kevin Hilman" <khilman@...nel.org>,
	"Ulf Hansson" <ulf.hansson@...aro.org>
Cc:	linux-clk@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-sh@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Geert Uytterhoeven" <geert+renesas@...der.be>
Subject: Re: [PATCH v2 13/14] clk: shmobile: mstp: Consider "zb_clk" suitable for
 power management

Quoting Geert Uytterhoeven (2015-05-28 11:53:38)
> Currently the CPG Clock Domain code looks for MSTP clocks to power
> manage a device.
> 
> Unfortunately, on R-Mobile APE6 (r8a73a4) and SH-Mobile AG5 (sh73a0),
> the Bus State Controller (BSC) is not power-managed by an MSTP clock,
> but by a plain CPG clock (zb_clk).  Add a special case to handle this,
> so the clock is properly managed, and devices connected to the BSC work
> as expected.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> ---
> v2:
>   - New.
> ---
>  drivers/clk/shmobile/clk-mstp.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/clk/shmobile/clk-mstp.c b/drivers/clk/shmobile/clk-mstp.c
> index 619f3eccefd4884f..19e2b11953383587 100644
> --- a/drivers/clk/shmobile/clk-mstp.c
> +++ b/drivers/clk/shmobile/clk-mstp.c
> @@ -258,6 +258,10 @@ int cpg_mstp_attach_dev(struct generic_pm_domain *domain, struct device *dev)
>                                             "renesas,cpg-mstp-clocks"))
>                         goto found;
>  
> +               /* BSC on r8a73a4/sh73a0 uses zb_clk instead of an mstp clock*/
> +               if (!strcmp(clkspec.np->name, "zb_clk"))
> +                       goto found;

Hello Geert,

Is the driver the right place to handle this corner case? What do you
think about linking zb_clk up to the bsc devicetree node for
r8a73a4/sh73a0?

Regards,
Mike

> +
>                 of_node_put(clkspec.np);
>                 i++;
>         }
> -- 
> 1.9.1
> 
> --
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