linux-kernel - Re: [PATCH 1/5] ARM: AM43xx: hwmod: add VPFE hwmod entries

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Date:	Tue, 20 Jan 2015 07:18:19 +0000 (UTC)
From:	Paul Walmsley <paul@...an.com>
To:	"Lad, Prabhakar" <prabhakar.csengg@...il.com>, bparrot@...com,
	detheridge@...com, balbi@...com
cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Tony Lindgren <tony@...mide.com>, devicetree@...r.kernel.org,
	LAK <linux-arm-kernel@...ts.infradead.org>,
	OMAP <linux-omap@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/5] ARM: AM43xx: hwmod: add VPFE hwmod entries

Hi

On Thu, 18 Dec 2014, Lad, Prabhakar wrote:

> From: Benoit Parrot <bparrot@...com>
> 
> this patch adds VPFE HWMOD data for AM43xx.
> 
> Signed-off-by: Benoit Parrot <bparrot@...com>
> Signed-off-by: Darren Etheridge <detheridge@...com>
> Signed-off-by: Felipe Balbi <balbi@...com>
> Signed-off-by: Lad, Prabhakar <prabhakar.csengg@...il.com>

...

> ---
>  arch/arm/mach-omap2/omap_hwmod_43xx_data.c | 56 ++++++++++++++++++++++++++++++
>  arch/arm/mach-omap2/prcm43xx.h             |  3 +-
>  2 files changed, 58 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm/mach-omap2/omap_hwmod_43xx_data.c b/arch/arm/mach-omap2/omap_hwmod_43xx_data.c
> index fea01aa..bd9067e 100644
> --- a/arch/arm/mach-omap2/omap_hwmod_43xx_data.c
> +++ b/arch/arm/mach-omap2/omap_hwmod_43xx_data.c

...

> @@ -750,6 +788,22 @@ static struct omap_hwmod_ocp_if am43xx_l4_ls__dss_rfbi = {
>  	.user		= OCP_USER_MPU | OCP_USER_SDMA,
>  };
>  
> +static struct omap_hwmod_ocp_if am43xx_l3__vpfe0 = {
> +	.master         = &am33xx_l3_main_hwmod,
> +	.slave          = &am43xx_vpfe0_hwmod,
> +	.clk            = "l3_gclk",
> +	.flags          = OCPIF_SWSUP_IDLE,
> +	.user           = OCP_USER_MPU,
> +};
> +
> +static struct omap_hwmod_ocp_if am43xx_l3__vpfe1 = {
> +	.master         = &am33xx_l3_main_hwmod,
> +	.slave          = &am43xx_vpfe1_hwmod,
> +	.clk            = "l3_gclk",
> +	.flags          = OCPIF_SWSUP_IDLE,
> +	.user           = OCP_USER_MPU,
> +};
> +
>  static struct omap_hwmod_ocp_if *am43xx_hwmod_ocp_ifs[] __initdata = {
>  	&am33xx_l4_wkup__synctimer,
>  	&am43xx_l4_ls__timer8,
> @@ -848,6 +902,8 @@ static struct omap_hwmod_ocp_if *am43xx_hwmod_ocp_ifs[] __initdata = {
>  	&am43xx_l4_ls__dss,
>  	&am43xx_l4_ls__dss_dispc,
>  	&am43xx_l4_ls__dss_rfbi,
> +	&am43xx_l3__vpfe0,
> +	&am43xx_l3__vpfe1,
>  	NULL,
>  };

According to SPRUHL7 Figure 14-1 "VPFE Integration" and Table 14-2 "VPFE 
Connectivity Attributes", a VPFE has two interconnect ports per instance: 
one L4-Per port as a register target, and one L3 port as a DMA initiator.  
It's unclear to me whether the L3 port can also serve as a register 
target, but Section 2.1 "ARM Cortex-A9 Memory Map", Table 4-1 "L3 
Master-Slave Connectivity", and Figure 4-2 "L4 Topology" suggest that it 
cannot.

So if that's correct, there should be two more struct omap_hwmod_ocp_if 
records added in this patch for the register target ports that are 
connected to the L4.  DSS is a good example: see am43xx_dss__l3_main and 
am43xx_l4_ls__dss in this same file.


- Paul
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