linux-kernel - Re: [PATCH] pwm: imx: add ipg clock operation

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Message-ID: <20181220172824.GC9408@ulmo>
Date:   Thu, 20 Dec 2018 18:28:24 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Anson Huang <anson.huang@....com>
Cc:     "linux-pwm@...r.kernel.org" <linux-pwm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH] pwm: imx: add ipg clock operation

On Wed, Dec 19, 2018 at 05:24:58AM +0000, Anson Huang wrote:
> i.MX PWM module's ipg_clk_s is for PWM register access, on
> most of i.MX SoCs, this ipg_clk_s is from system ipg clock
> or perclk which is always enabled, but on i.MX7D, the ipg_clk_s
> is from PWM1_CLK_ROOT which is controlled by CCGR132, that means
> the CCGR132 MUST be enabled first before accessing PWM registers
> on i.MX7D. This patch adds ipg clock operation to make sure
> register access successfully on i.MX7D and it fixes Linux kernel
> boot up hang during PWM driver probe.
> 
> Fixes: 4a23e6ee9f69 ("ARM: dts: imx7d-sdb: Restore pwm backlight support")
> Signed-off-by: Anson Huang <Anson.Huang@....com>
> ---
>  drivers/pwm/pwm-imx.c | 53 ++++++++++++++++++++++++++++++++++++++++++++++-----
>  1 file changed, 48 insertions(+), 5 deletions(-)

Applied, thanks.

Thierry

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