From: Doug Anderson <dianders@chromium.org>
To: Amit Kucheria <amit.kucheria@linaro.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
Rajendra Nayak <rnayak@codeaurora.org>,
linux-arm-msm <linux-arm-msm@vger.kernel.org>,
Bjorn Andersson <bjorn.andersson@linaro.org>,
Eduardo Valentin <edubezval@gmail.com>,
smohanad@codeaurora.org,
Vivek Gautam <vivek.gautam@codeaurora.org>,
Andy Gross <andy.gross@linaro.org>,
Zhang Rui <rui.zhang@intel.com>,
linux-pm@vger.kernel.org
Subject: Re: [PATCH v6 2/7] thermal: tsens: Add support to split up register address space into two
Date: Wed, 11 Jul 2018 11:37:07 -0700 [thread overview]
Message-ID: <CAD=FV=UGjf+qSfzYbQ1OEydEWJH2e8vhNiOPAytPH_rnkabq3Q@mail.gmail.com> (raw)
In-Reply-To: <e7c5c74bd5ad1820f0f015d8e9b3d7c7b24854a4.1531135999.git.amit.kucheria@linaro.org>
Hi,
On Mon, Jul 9, 2018 at 4:43 AM, Amit Kucheria <amit.kucheria@linaro.org> wrote:
> There are two banks of registers for v2 TSENS IPs: SROT and TM. On older
> SoCs these were contiguous, leading to DTs mapping them as one register
> address space of size 0x2000. In newer SoCs, these two banks are not
> contiguous anymore.
>
> Fixing old DTs to split the address space into allows us to have cleaner
> common code e.g. get_temp() that is shared across new and old platforms.
This makes it sound like old DTs won't be supported anymore. ...but
the code says otherwise. I'd just remove the above paragraph.
> @@ -126,11 +127,21 @@ static const struct regmap_config tsens_config = {
> int __init init_common(struct tsens_device *tmdev)
> {
> void __iomem *base;
> + struct platform_device *op = of_find_device_by_node(tmdev->dev->of_node);
>
> + if (!op)
> + return -EINVAL;
> base = of_iomap(tmdev->dev->of_node, 0);
> if (!base)
> return -EINVAL;
>
> + if (op->num_resources > 1) {
Maybe add a comment here that says that we don't actually map the SROT
yet because you don't read anything from there? I kept getting
confused about how this patch could possibly work with no code to map
SROT...
> + tmdev->tm_offset = 0;
> + } else {
> + /* old DTs where SROT and TM were in a contiguous 2K block */
> + tmdev->tm_offset = 0x1000;
This patch without patch #4 will break compatibility. You should
squash part of patch #4 into this one, specifically:
-#define STATUS_OFFSET 0x10a0
-#define LAST_TEMP_MASK 0xfff
+#define STATUS_OFFSET 0xa0
+#define LAST_TEMP_MASK 0xfff
Without that you break bisect-ability and also confuse anyone trying
to look at this patch.
-Doug
next prev parent reply other threads:[~2018-07-11 18:37 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-09 11:43 [PATCH v6 0/7] thermal: tsens: Refactoring for TSENSv2 IP Amit Kucheria
2018-07-09 11:43 ` [PATCH v6 1/7] thermal: tsens: Get rid of unused fields in structure Amit Kucheria
2018-07-09 11:43 ` [PATCH v6 2/7] thermal: tsens: Add support to split up register address space into two Amit Kucheria
2018-07-11 16:34 ` Bjorn Andersson
2018-07-11 18:37 ` Doug Anderson [this message]
2018-07-12 4:40 ` Amit Kucheria
2018-07-09 11:43 ` [PATCH v6 3/7] dt: qcom: 8996: thermal: Move to DT initialisation Amit Kucheria
2018-07-11 16:37 ` Bjorn Andersson
2018-07-11 18:39 ` Doug Anderson
2018-07-12 5:03 ` Amit Kucheria
2018-07-09 11:43 ` [PATCH v6 4/7] thermal: tsens: Rename tsens-8996 to tsens-v2 for reuse Amit Kucheria
2018-07-11 16:39 ` Bjorn Andersson
2018-07-09 11:43 ` [PATCH v6 5/7] thermal: tsens: Add generic support for TSENS v2 IP Amit Kucheria
2018-07-11 16:40 ` Bjorn Andersson
2018-07-11 18:40 ` Doug Anderson
2018-07-12 5:12 ` Amit Kucheria
2018-07-09 11:43 ` [PATCH v6 6/7] dt: thermal: tsens: Document the fallback DT property for v2 of TSENS IP Amit Kucheria
2018-07-11 13:49 ` Rob Herring
2018-07-11 16:42 ` Bjorn Andersson
2018-07-11 18:42 ` Doug Anderson
2018-07-12 5:56 ` Amit Kucheria
2018-07-09 11:43 ` [PATCH v6 7/7] arm64: dts: sdm845: Add tsens nodes Amit Kucheria
2018-07-11 16:41 ` Bjorn Andersson
2018-07-11 18:44 ` Doug Anderson
2018-07-11 21:51 ` Matthias Kaehlcke
2018-07-11 22:00 ` Doug Anderson
2018-07-12 5:36 ` Amit Kucheria
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