LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Mark Rutland <mark.rutland@arm.com>
To: Wenyou Yang <wenyou.yang@atmel.com>
Cc: "nicolas.ferre@atmel.com" <nicolas.ferre@atmel.com>,
	"linux@arm.linux.org.uk" <linux@arm.linux.org.uk>,
	"sylvain.rochet@finsecur.com" <sylvain.rochet@finsecur.com>,
	"Patrice.VILCHEZ@atmel.com" <Patrice.VILCHEZ@atmel.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"alexandre.belloni@free-electrons.com" 
	<alexandre.belloni@free-electrons.com>,
	"peda@axentia.se" <peda@axentia.se>,
	"linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH 6/7] pm: at91: add achieve the mpddrc peripheral ID and the DDR clock ID support
Date: Mon, 26 Jan 2015 11:49:56 +0000	[thread overview]
Message-ID: <20150126114956.GE23313@leverpostej> (raw)
In-Reply-To: <1422266896-24666-1-git-send-email-wenyou.yang@atmel.com>

On Mon, Jan 26, 2015 at 10:08:16AM +0000, Wenyou Yang wrote:
> The patch achieves the mpddr controller peripheral ID
> and the DDR clock ID from the dts file.
> 
> They will be used in the future to disable the mpddr controller'c clock
> the and DDR clock to decrease the power consumption during suspending.
> 
> Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
> ---
>  arch/arm/mach-at91/generic.h |    2 ++
>  arch/arm/mach-at91/setup.c   |   24 ++++++++++++++++++++++++
>  2 files changed, 26 insertions(+)
> 
> diff --git a/arch/arm/mach-at91/generic.h b/arch/arm/mach-at91/generic.h
> index 41796bf..3c72a3e 100644
> --- a/arch/arm/mach-at91/generic.h
> +++ b/arch/arm/mach-at91/generic.h
> @@ -47,6 +47,8 @@ void __init at91_sam9x5_pm_init(void) { }
>  struct at91_pm_struct {
>  	unsigned long uhp_udp_mask;
>  	int memctrl;
> +	u32 mpddrc_id[2];
> +	u32 ddrck_id;
>  };
>  
>  #endif /* _AT91_GENERIC_H */
> diff --git a/arch/arm/mach-at91/setup.c b/arch/arm/mach-at91/setup.c
> index 7924663..a306f95 100644
> --- a/arch/arm/mach-at91/setup.c
> +++ b/arch/arm/mach-at91/setup.c
> @@ -363,6 +363,27 @@ void __init at91_ioremap_matrix(u32 base_addr)
>  		panic(pr_fmt("Impossible to ioremap at91_matrix_base\n"));
>  }
>  
> +static u32 at91_of_get_ddr_id(struct device_node *np, char *name)
> +{
> +	struct of_phandle_args clkspec;
> +	u32 id;
> +	int index;
> +	int rc;
> +
> +	index = of_property_match_string(np, "clock-names", name);
> +	rc = of_parse_phandle_with_args(np, "clocks", "#clock-cells", index, &clkspec);
> +	if (rc)
> +		return 0;
> +
> +	rc = of_property_read_u32(clkspec.np, "reg", &id);
> +	if (rc)
> +		return 0;
> +
> +	of_node_put(clkspec.np);
> +
> +	return id;
> +}

This doesn't look right to me. This assumes the format of the clock
provider node, which invalidates the point of having the abstraction in
the first place.

> +
>  struct at91_ramc_of_data {
>  	u8 ramc_type;
>  };
> @@ -400,6 +421,9 @@ static void at91_dt_ramc(void)
>  		of_data = of_id->data;
>  		at91_pm_data.memctrl = of_data->ramc_type;
>  
> +		at91_pm_data.mpddrc_id[idx] = at91_of_get_ddr_id(np, "mpddr");
> +		at91_pm_data.ddrck_id = at91_of_get_ddr_id(np, "ddrck");
> +

Why do you need these here?

Surely the logic for poking any clocks should live in the relevant
clock controller drivers?

Mark.

  reply	other threads:[~2015-01-26 11:50 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-26 10:03 [PATCH 0/7] AT91 pm improvements for 3.20 Wenyou Yang
2015-01-26 10:04 ` [PATCH 1/7] pm: at91: achieve the memory controller's type from the dts file Wenyou Yang
2015-01-26 10:06 ` [PATCH 2/7] pm: at91: pm_suspend: add the WFI support for ARMv7 Wenyou Yang
2015-01-26 13:05   ` Sergei Shtylyov
2015-01-27  4:44     ` Yang, Wenyou
2015-01-28 11:25   ` Lorenzo Pieralisi
2015-01-29  2:36     ` Yang, Wenyou
2015-01-29 12:22       ` Lorenzo Pieralisi
2015-01-30  7:23         ` Yang, Wenyou
2015-01-30 10:17           ` Lorenzo Pieralisi
2015-01-30 10:44           ` Lorenzo Pieralisi
2015-01-26 10:06 ` [PATCH 3/7] pm: at91: pm_suspend: MOR register KEY was missing Wenyou Yang
2015-01-26 10:07 ` [PATCH 4/7] ARM: at91: enable the L2 Cache controller Wenyou Yang
2015-01-26 11:46   ` Mark Rutland
2015-01-26 12:45   ` Russell King - ARM Linux
2015-01-26 22:36   ` Alexandre Belloni
2015-01-27  5:11     ` Yang, Wenyou
2015-01-26 10:07 ` [PATCH 5/7] pm: at91: add disable/enable the L1/L2 cache while suspend/resume Wenyou Yang
2015-01-26 10:08 ` [PATCH 6/7] pm: at91: add achieve the mpddrc peripheral ID and the DDR clock ID support Wenyou Yang
2015-01-26 11:49   ` Mark Rutland [this message]
2015-01-27  5:24     ` Yang, Wenyou
2015-01-26 10:08 ` [PATCH 7/7] pm: at91: add disable/enable the mpddrc's clock and DDR clock support Wenyou Yang

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20150126114956.GE23313@leverpostej \
    --to=mark.rutland@arm.com \
    --cc=Patrice.VILCHEZ@atmel.com \
    --cc=alexandre.belloni@free-electrons.com \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux@arm.linux.org.uk \
    --cc=nicolas.ferre@atmel.com \
    --cc=peda@axentia.se \
    --cc=sylvain.rochet@finsecur.com \
    --cc=wenyou.yang@atmel.com \
    --subject='Re: [PATCH 6/7] pm: at91: add achieve the mpddrc peripheral ID and the DDR clock ID support' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).