linux-kernel - [PATCH v5 0/8] clk: Don't duplicate initialization on platform

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Date:	Tue,  5 Jul 2016 18:23:24 +0200
From:	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
To:	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>, s.hauer@...gutronix.de,
	linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Subject: [PATCH v5 0/8] clk: Don't duplicate initialization on platform_dev

Clock providers can be probed as a normal platform device, or via
of_clk_init() before the rest of the platform devices are initialized
using the CLK_OF_DECLARE() macro.

If a driver required both initialization methodologies, the core would call
both probe/init functions.

This changeset prevent the dual initialization using the OF_POPULATE flag.

It also creates a new macro, CLK_OF_DECLARE_DRIVER, used by drivers that
require double initialization.

Finally, it adds module platform driver initialization to fixed-factor
and fixed-rate, enabling its use in dt overlays.

The order of the patches allows future bisects of the change. This explains
why  Avoid double initialization of clocks() is done almost at the end.

v5: Changes proposed by: Stephen Boyd <sboyd@...eaurora.org>
-Create CLK_OF_DECLARE_DRIVER() macro
-use it in clk-artpec6, sunxi,nxp

v4: Huge MACRO(), not posted to the list

v3: Use OF_POPULATE flag inside fixed-rate and fixed-factor

v2: Changes proposed by: Stephen Boyd <sboyd@...eaurora.org>
-Add error check
-CodeStyle on of_device_ide
-Use builtin_platform_driver()

When clock providers are added to the device tree after of_clk_init is called
they are not added to the clock provider list. This makes that drivers such
as i2c-xiic.c fail to init, as they may depend on the unadded clock provider.

Ricardo Ribalda Delgado (8):
  clk: core: New macro CLK_OF_DECLARE_DRIVER
  clk: axis: Use new macro CLK_OF_DECLARE_DRIVER
  clk: npx: Use new macro CLK_OF_DECLARE_DRIVER
  clk: sunxi: mod0: Use new macro CLK_OF_DECLARE_DRIVER
  clk: sunxi: apb0: Use new macro CLK_OF_DECLARE_DRIVER
  clk: core: Avoid double initialization of clocks
  clk: fixed-factor: Convert into a module platform driver
  clk: fixed-rate: Convert into a module platform driver

 drivers/clk/axis/clk-artpec6.c     |  4 +--
 drivers/clk/clk-fixed-factor.c     | 72 +++++++++++++++++++++++++++++++++++---
 drivers/clk/clk-fixed-rate.c       | 69 +++++++++++++++++++++++++++++++++---
 drivers/clk/clk.c                  |  4 +++
 drivers/clk/nxp/clk-lpc18xx-creg.c |  3 +-
 drivers/clk/sunxi/clk-mod0.c       |  3 +-
 drivers/clk/sunxi/clk-sun8i-apb0.c |  4 +--
 include/linux/clk-provider.h       | 12 +++++++
 8 files changed, 156 insertions(+), 15 deletions(-)

-- 
2.8.1