linux-kernel - Re: [PATCH v7 RESEND 2/3] thermal: exynos_tmu: Support new hardware and update TMU interface

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Message-ID: <ec51f257-e961-4e21-94d9-68825cbfe287@linaro.org>
Date: Mon, 24 Nov 2025 12:16:31 +0100
From: Daniel Lezcano <daniel.lezcano@...aro.org>
To: Tudor Ambarus <tudor.ambarus@...aro.org>, 손신
 <shin.son@...sung.com>, 'Bartlomiej Zolnierkiewicz' <bzolnier@...il.com>,
 'Krzysztof Kozlowski' <krzk@...nel.org>,
 "'Rafael J . Wysocki'" <rafael@...nel.org>, 'Zhang Rui'
 <rui.zhang@...el.com>, 'Lukasz Luba' <lukasz.luba@....com>,
 'Rob Herring' <robh@...nel.org>, 'Conor Dooley' <conor+dt@...nel.org>,
 'Alim Akhtar' <alim.akhtar@...sung.com>
Cc: 'Henrik Grimler' <henrik@...mler.se>, linux-pm@...r.kernel.org,
 linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 Peter Griffin <peter.griffin@...aro.org>,
 André Draszik <andre.draszik@...aro.org>,
 William McVicker <willmcvicker@...gle.com>, jyescas@...gle.com
Subject: Re: [PATCH v7 RESEND 2/3] thermal: exynos_tmu: Support new hardware
 and update TMU interface

Hi Tudor,

On 11/24/25 11:43, Tudor Ambarus wrote:
> Hi, Shin,
> 
> On 11/24/25 12:06 PM, 손신 wrote:
>>>> +static void update_con_reg(struct exynos_tmu_data *data) {
>>>> +	u32 val, t_buf_vref_sel, t_buf_slope_sel;
>>>> +
>>>> +	val = readl(data->base + EXYNOS_TMU_REG_TRIMINFO);
>>>> +	t_buf_vref_sel = (val >> EXYNOSAUTOV920_TMU_T_BUF_VREF_SEL_SHIFT)
>>>> +				& EXYNOSAUTOV920_TMU_T_BUF_VREF_SEL_MASK;
>>>> +	t_buf_slope_sel = (val >> EXYNOSAUTOV920_TMU_T_BUF_SLOPE_SEL_SHIFT)
>>>> +				& EXYNOSAUTOV920_TMU_T_BUF_SLOPE_SEL_MASK;
>>>> +
>>>> +	val = readl(data->base +  EXYNOSAUTOV920_TMU_REG_CONTROL);
>>>> +	val &= ~(EXYNOS_TMU_REF_VOLTAGE_MASK <<
>>> EXYNOS_TMU_REF_VOLTAGE_SHIFT);
>>>> +	val |= (t_buf_vref_sel << EXYNOS_TMU_REF_VOLTAGE_SHIFT);
>>>> +	val &= ~(EXYNOS_TMU_BUF_SLOPE_SEL_MASK <<
>>> EXYNOS_TMU_BUF_SLOPE_SEL_SHIFT);
>>>> +	val |= (t_buf_slope_sel << EXYNOS_TMU_BUF_SLOPE_SEL_SHIFT);
>>>> +	writel(val, data->base + EXYNOSAUTOV920_TMU_REG_CONTROL);
>>>> +
>>>> +	val = readl(data->base + EXYNOSAUTOV920_TMU_REG_CONTROL1);
>>>> +	val &= ~(EXYNOSAUTOV920_TMU_NUM_PROBE_MASK <<
>>> EXYNOSAUTOV920_TMU_NUM_PROBE_SHIFT);
>>>> +	val &= ~(EXYNOSAUTOV920_TMU_LPI_MODE_MASK <<
>>> EXYNOSAUTOV920_TMU_LPI_MODE_SHIFT);
>>>> +	val |= (data->sensor_count << EXYNOSAUTOV920_TMU_NUM_PROBE_SHIFT);
>>>> +	writel(val, data->base + EXYNOSAUTOV920_TMU_REG_CONTROL1);
>>>> +
>>>> +	writel(1, data->base + EXYNOSAUTOV920_TMU_SAMPLING_INTERVAL);
>>>> +	writel(EXYNOSAUTOV920_TMU_AVG_CON_UPDATE, data->base +
>>> EXYNOSAUTOV920_TMU_REG_AVG_CONTROL);
>>>> +	writel(EXYNOSAUTOV920_TMU_COUNTER_VALUE0_UPDATE,
>>>> +	       data->base + EXYNOSAUTOV920_TMU_REG_COUNTER_VALUE0);
>>>> +	writel(EXYNOSAUTOV920_TMU_COUNTER_VALUE1_UPDATE,
>>>> +	       data->base + EXYNOSAUTOV920_TMU_REG_COUNTER_VALUE1);
>>>> +}
>>>> +
>>> This is unreadable; please make it understandable for those who don’t have
>>> the documentation (explicit static inline functions, comments, etc ...).
>> I'll restructure this code by introducing explicit static inline helper functions and proper comments to improve readability.
> 
> We likely shouldn't use inlines here, see Linus's reply from 2006:
> https://lore.kernel.org/all/Pine.LNX.4.64.0601021105000.3668@g5.osdl.org/T/#u

We should not use inline functions when they can be called from 
different places and if they contain a significant amount of code inside.

But for one line functions, inside a driver it may help for the 
readability when the function name is self-explanatory.

> I guess you can make this easier to read if you use FIELD_GET/SET from
> bitfield.h. Other improvement would be using the regmap api.

regmap would be too overkill to write unshared registers.

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