linux-kernel - [PATCH v3 0/2] clk: fractional-divider: Improve approximation when zero based

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Message-ID: <20230614185521.477924-1-frank@oltmanns.dev>
Date:   Wed, 14 Jun 2023 20:55:19 +0200
From:   Frank Oltmanns <frank@...manns.dev>
To:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>
Cc:     Frank Oltmanns <frank@...manns.dev>,
        "A.s. Dong" <aisheng.dong@....com>,
        Abel Vesa <abelvesa@...nel.org>,
        Fabio Estevam <festevam@...il.com>,
        linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, NXP Linux Team <linux-imx@....com>,
        Peng Fan <peng.fan@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>
Subject: [PATCH v3 0/2] clk: fractional-divider: Improve approximation when zero based

I stumpled upon this, when familiarizing myself with clk drivers.
Unfortunately, I have no boards to test this patch. It seems the only
user of this flag in mainline is drivers/clk/imx/clk-composite-7ulp.c,
therefore I'm cc-ing
get_maintainers.pl --git-blame -f drivers/clk/imx/clk-composite-7ulp.c
in the hopes of a wider audience.

V2: https://lore.kernel.org/lkml/20230613083626.227476-1-frank@oltmanns.dev/
V1: https://lore.kernel.org/lkml/20230529133433.56215-1-frank@oltmanns.dev/

Changes since V2:
 - Completely reworked the test cases
   - Moved tests to separate file as per Stephen's request
   - Move each edge case into their individual test case as per
     Stephen's request
   - Test clk_fd_round_rate instead of
     clk_fractional_divider_general_approximation as testing the latter
     broke builds

Changes since V1:
 - Added test case as requested by Stephen Boyd
 - Fixed commit message as the Cc: was missing a closing bracket, so that the
   original mail unfortunately did not go out to A. s. Dong.

Thank you for considering this contribution,
  Frank

Frank Oltmanns (2):
  clk: fractional-divider: Improve approximation when zero based
  clk: fractional-divider: tests: Add test suite for edge cases

 drivers/clk/.kunitconfig                  |   1 +
 drivers/clk/Kconfig                       |   7 +
 drivers/clk/Makefile                      |   1 +
 drivers/clk/clk-fractional-divider.c      |  26 ++-
 drivers/clk/clk-fractional-divider_test.c | 196 ++++++++++++++++++++++
 5 files changed, 224 insertions(+), 7 deletions(-)
 create mode 100644 drivers/clk/clk-fractional-divider_test.c

-- 
2.41.0