linux-kernel - Re: [PATCH v9 1/5] thermal: rockchip: add driver for thermal

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Date:	Tue, 14 Oct 2014 22:03:00 +0800
From:	Caesar Wang <caesar.wang@...k-chips.com>
To:	Doug Anderson <dianders@...omium.org>
CC:	Heiko Stübner <heiko@...ech.de>,
	Zhang Rui <rui.zhang@...el.com>,
	Eduardo Valentin <edubezval@...il.com>,
	Arnd Bergmann <arnd@...db.de>, zyf <zyf@...k-chips.com>,
	linux-rockchip@...ts.infradead.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	Eddie Cai <cf@...k-chips.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Derek Basehore <dbasehore@...omium.org>,
	Tao Huang <huangtao@...k-chips.com>,
	陈渐飞 <cjf@...k-chips.com>,
	Shunqian Zheng <zhengsq@...k-chips.com>
Subject: Re: [PATCH v9 1/5] thermal: rockchip: add driver for thermal

Doug,

在 2014年10月14日 00:11, Doug Anderson 写道:
> Caesar,
>
> On Sat, Oct 11, 2014 at 12:29 AM, Caesar Wang
> <caesar.wang@...k-chips.com> wrote:
>
>> +static void rk_tsadcv2_initialize(int reset_mode, int chn, void __iomem *regs,
>> +                                 unsigned long hw_shut_temp)
>> +{
>> +       u32 shutdown_value;
>> +
>> +       shutdown_value = rk_tsadcv2_temp_to_code(hw_shut_temp);
>> +
>> +       /* Enable measurements at ~ 10 Hz */
>> +       writel_relaxed(0 | TSADCV2_AUTO_TSHUT_POLARITY_HIGH, regs +
>> +                      TSADCV2_AUTO_CON);
>> +       writel_relaxed(TSADCV2_AUTO_PERIOD_TIME, regs + TSADCV2_AUTO_PERIOD);
>> +       writel_relaxed(TSADCV2_AUTO_PERIOD_HT_TIME, regs +
>> +                      TSADCV2_AUTO_PERIOD_HT);
>> +       writel_relaxed(shutdown_value, regs + TSADCV2_COMP_SHUT(chn));
>> +       writel_relaxed(TSADCV2_HIGHT_INT_DEBOUNCE_TIME, regs +
>> +                      TSADCV2_HIGHT_INT_DEBOUNCE);
>> +       writel_relaxed(TSADCV2_HIGHT_TSHUT_DEBOUNCE_TIME, regs +
>> +                      TSADCV2_HIGHT_TSHUT_DEBOUNCE);
>> +
>> +       if (reset_mode == GPIO)
>> +               writel_relaxed(TSADCV2_SHUT_2GPIO_SRC_EN(chn) |
>> +                              TSADCV2_INT_SRC_EN(chn), regs +
>> +                              TSADCV2_INT_EN);
>> +       else
>> +               writel_relaxed(TSADCV2_SHUT_2CRU_SRC_EN(chn) |
>> +                              TSADCV2_INT_SRC_EN(chn) , regs +
>> +                              TSADCV2_INT_EN);
>> +
>> +       writel_relaxed(TSADCV2_AUTO_SRC_EN(chn) | TSADCV2_AUTO_EN, regs +
>> +                      TSADCV2_AUTO_CON);
> Aren't you clobbering the polarity here?
>
> NOTE: I didn't do a full review of this driver, just noticed that
> while looking at another patch and figure'd I'd respond here, too.
>
Fixed. Maybe I should fix as follows:

/**
  * rk_tsadcv2_get_tshut_polarity - get the tshut polarity
  * the bit 8 is tshut polarity,default is low active.
  * 0: low active, 1: high active
  */
static bool rk_tsadcv2_get_tshut_polarity(void __iomem *regs)
{
     u32 val;
     bool tshut_polarity;

     val = readl_relaxed(regs + TSADCV2_AUTO_CON);
     tshut_polarity = (val & BIT(8))? 1 : 0;

     return tshut_polarity;
}
...
....

writel_relaxed(TSADCV2_AUTO_SRC_EN(chn) & (tshut_polarity << 8) |
		       TSADCV2_AUTO_EN, regs + TSADCV2_AUTO_CON);

>

-- 
Best regards,
Caesar


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