linux-kernel - Re: [PATCH 3/3] clk: berlin: bg2q: remove non-exist "smemc" gate clock

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Date:	Wed, 07 Jan 2015 15:11:58 +0100
From:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
To:	Jisheng Zhang <jszhang@...vell.com>, mturquette@...aro.org,
	sboyd@...eaurora.org, alexandre.belloni@...e-electrons.com,
	antoine.tenart@...e-electrons.com, robh+dt@...nel.org,
	pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	linux@....linux.org.uk
CC:	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 3/3] clk: berlin: bg2q: remove non-exist "smemc" gate
 clock

On 31.12.2014 09:57, Jisheng Zhang wrote:
> The "smemc" clock is removed on BG2Q SoCs. In fact, bit19 of clkenable
> register is for nfc. Current code use bit19 for non-exist "smemc"
> incorrectly, this prevents eMMC from working due to the sdhci's
> "core" clk is still gated.
>
> Signed-off-by: Jisheng Zhang <jszhang@...vell.com>
> Cc: stable@...r.kernel.org # 3.16+
> ---
>   drivers/clk/berlin/bg2q.c | 1 -
>   1 file changed, 1 deletion(-)
>
> diff --git a/drivers/clk/berlin/bg2q.c b/drivers/clk/berlin/bg2q.c
> index 21784e4..440ef81 100644
> --- a/drivers/clk/berlin/bg2q.c
> +++ b/drivers/clk/berlin/bg2q.c
> @@ -285,7 +285,6 @@ static const struct berlin2_gate_data bg2q_gates[] __initconst = {
>   	{ "pbridge",	"perif",	15, CLK_IGNORE_UNUSED },
>   	{ "sdio",	"perif",	16, CLK_IGNORE_UNUSED },
>   	{ "nfc",	"perif",	18 },
> -	{ "smemc",	"perif",	19 },

Jisheng,

if bit 19 is for nfc, how does that work out with bit 18 which is
still assigned to nfc? Can you re-evaluate clkenable registers for
BG2Q and fix it up accordingly? I'd suggest to still disable as many
clocks as possible rather than removing the corresponding clk_gates.

Sebastian

>   	{ "pcie",	"perif",	22 },
>   };
>
>

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