linux-kernel - [PATCH v4 0/2] pinctrl/arm: dt-bindings: deprecate header with register constants

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Message-Id: <20220816133016.77553-1-krzysztof.kozlowski@linaro.org>
Date:   Tue, 16 Aug 2022 16:30:14 +0300
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Tomasz Figa <tomasz.figa@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v4 0/2] pinctrl/arm: dt-bindings: deprecate header with register constants

Hi,

Changes since v3
================
1. Add patch 1 - bindings example fixes.
2. All dependencies were merged, so this can go via Samsung pinctrl tree.

Changes since v2
================
1. Split last bindings patch per driver changes and bindings.
2. Add tags.

Changes since v1
================
1. Correct title (in the comment) of each header (Chanho).
2. Patch #7: Adjust warning message.
3. Add tags.

Description
===========
The Samsung pin controller drivers were always expecting DTS to use raw
register values for pin configuration (e.g. pull up/down, drive strength).  DTS
had these values hard-coded all over, so at some point we decided for
convenience to move them to dt-bindings header.  Less code duplication, some
meaning added to raw number, etc.

However these constants do not fit the purpose of bindings.  They do not
provide any abstraction, any hardware and driver independent ID.  With minor
exceptions, the Linux drivers actually do not use the bindings header at
all.  Because of this "dt-bindings ID" approach, these constants were re-used
between chips, e.g. Exynos ones in S5PV210.  These does not make much sense
because the values between Exynos and S5PV210 (or S3C24xx) are not related.  If
it was an abstraction ID, this would be fine. But it's not.

Clean this up by:
1. Moving the constants to DTS-local headers.
2. Deprecating the bindings header.

Tested by comparing DTBs (dtx_diff, fdtdump).

Best regards,
Krzysztof

Krzysztof Kozlowski (2):
  dt-bindings: pinctrl: samsung: stop using bindings header with
    constants
  dt-bindings: pinctrl: samsung: deprecate header with register
    constants

 .../pinctrl/samsung,pinctrl-pins-cfg.yaml     |  1 -
 .../bindings/pinctrl/samsung,pinctrl.yaml     | 63 ++++++++-----------
 include/dt-bindings/pinctrl/samsung.h         |  7 +++
 3 files changed, 34 insertions(+), 37 deletions(-)

-- 
2.34.1