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From:   Rahul Tanwar <rtanwar@maxlinear.com>
To:     <sboyd@kernel.org>, <mturquette@baylibre.com>,
        <linux-clk@vger.kernel.org>
CC:     <linux-kernel@vger.kernel.org>, <linux-lgm-soc@maxlinear.com>,
        "Rahul Tanwar" <rtanwar@maxlinear.com>
Subject: [PATCH v2 0/5] Modify MxL's CGU clk driver to make it secure boot compatible
Date:   Mon, 5 Sep 2022 15:43:43 +0800
Message-ID: <cover.1662363020.git.rtanwar@maxlinear.com>
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MxL's CGU driver was found to be lacking below required features. Add these
required lacking features:

1. Since it is a core driver, it has to conform to secure boot & secure
   access architecture. In order for the register accesses to be secure
   access compliant, it needs regmap support as per our security architectu=
re.
   Hence, replace direct read/writel with regmap based IO. Also remove spin=
locks
   because they are no longer necessary because regmap uses its own lock.

2. There are some gate clocks which are used by the power mgmt IP to gate w=
hen
   a certain power saving mode is activated. These gate clocks can also be=
=20
   gated from CGU clk driver. This creates a conflict. To avoid the conflic=
t,
   by default disable gating such gate registers from CGU clk driver. But k=
eep
   a flag to do so for other older IP's which uses same CGU clk IP but does=
 not
   use same power mgmt IP.

3. Fix two functional bugs found during testing.

This patch series is based on below git tree:
git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux.git


Rahul Tanwar (5):
  clk: mxl: Switch from direct readl/writel based IO to regmap based IO
  clk: mxl: Remove unnecessary spinlocks
  clk: mxl: Avoid disabling gate clocks from clk driver
  clk: mxl: Add validation for register reads/writes
  clk: mxl: Add a missing flag to allow parent clock rate change

 drivers/clk/x86/Kconfig       |   5 +-
 drivers/clk/x86/clk-cgu-pll.c |  23 ++-----
 drivers/clk/x86/clk-cgu.c     | 117 +++++++++++-----------------------
 drivers/clk/x86/clk-cgu.h     |  71 +++++++++++++--------
 drivers/clk/x86/clk-lgm.c     |  16 +++--
 5 files changed, 101 insertions(+), 131 deletions(-)

--=20
2.17.1