linux-kernel - Re: [PATCH 1/2] thermal: tsens: Add support for SDM845 platform

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Message-ID: <20180604150319.GC510@tuxbook-pro>
Date:   Mon, 4 Jun 2018 08:03:19 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Amit Kucheria <amit.kucheria@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, rnayak@...eaurora.org,
        edubezval@...il.com, Zhang Rui <rui.zhang@...el.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "open list:THERMAL" <linux-pm@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] thermal: tsens: Add support for SDM845 platform

On Sat 02 Jun 04:11 PDT 2018, Amit Kucheria wrote:
> diff --git a/drivers/thermal/qcom/tsens-sdm845.c b/drivers/thermal/qcom/tsens-sdm845.c
[..]
> +#define TRDY_OFFSET     0xe4
> +#define TRDY_READY_BIT  BIT(1)

This is bit 0.

> +
> +#define STATUS_OFFSET	0xa0
> +#define LAST_TEMP_MASK	0xfff
> +#define STATUS_VALID_BIT	BIT(21)
> +#define CODE_SIGN_BIT		BIT(11)
> +
> +static int get_temp_sdm845(struct tsens_device *tmdev, int id, int *temp)
> +{
> +	struct tsens_sensor *s = &tmdev->sensor[id];
> +	u32 code;
> +	unsigned int sensor_addr;
> +	int last_temp = 0, last_temp2 = 0, last_temp3 = 0, ret;
> +
> +	ret = regmap_read(tmdev->map, TRDY_OFFSET, &code);
> +	if (ret)
> +		return ret;
> +	if (code & TRDY_READY_BIT)
> +		return -ENODATA;

This section is the only difference from 8996, but this register is
identical to 8996 and 8998. So I think you should add this to
tsens-8996.c and we can use that for 8996, 8998 and sdm845.

Perhaps we should name it tsens-v2, as that seems to be the common
denominator for these, according to the documentation.

Regards,
Bjorn