linux-kernel - Re: [PATCH v4 0/9] Rewrite clk parent handling

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Date:   Mon, 15 Apr 2019 12:05:56 -0600
From:   Jeffrey Hugo <jhugo@...eaurora.org>
To:     Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>
Cc:     linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
        Chen-Yu Tsai <wens@...e.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jerome Brunet <jbrunet@...libre.com>,
        Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Rob Herring <robh@...nel.org>,
        Russell King <linux@...linux.org.uk>
Subject: Re: [PATCH v4 0/9] Rewrite clk parent handling

On 4/12/2019 12:31 PM, Stephen Boyd wrote:
> There are a couple warts with clk parent handling in the common clk
> framework. This patch series addresses one of those warts, parent-child
> linkages. We use strings for all parent-child linkages, and this leads
> to poorly written code that extracts clk names from struct clk pointers
> and makes clk provider drivers use clk consumer APIs. I've converted the
> fixed factor clk and I'm looking at converting users of other "basic"
> clk types in follow-up patches so we can start moving drivers away from
> string matching in the clk namespace.
> 
> Changes from v3:
>   * Split clkdev patch into two
>   * New patch to let dev_of_node() accept NULL
>   * Use dev_of_node() in of_clk_hw_register() to avoid NULL deref
> 
> Changes from v2:
>   * Dropped patches that got merged into v5.1-rc1
>   * Introduced a new function of_clk_hw_register()
>   * Introduced 'index' into clk_parent_data structure
>   * Converted fixed-factor basic type to new design
>   * Fixed some bugs in a recent patch to clkdev, leading to
>     an essential API for clkdev based lookups working
> 
> Changes from v1:
>   * Dropped new get_parent_hw, we'll pick it up in a later series
>   * Rebased to v5.0-rc6 to avoid conflicts with clk-fixes
>   * Renamed 'fallback' to 'name' and 'name' to 'fw_name' in parent map
>   * Made sure that clk_hw_get_parent_by_index() never sees an error pointer
>     so that we don't mistakenly try to defer an error pointer
>   * Fixed index passing mistake on of_clk_get_hw_from_clkspec()
>   * Copy over all the data from parent maps and free it correctly too
> 
> Cc: Chen-Yu Tsai <wens@...e.org>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Jeffrey Hugo <jhugo@...eaurora.org>
> Cc: Jerome Brunet <jbrunet@...libre.com>
> Cc: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
> Cc: Michael Turquette <mturquette@...libre.com>
> Cc: Miquel Raynal <miquel.raynal@...tlin.com>
> Cc: Rob Herring <robh@...nel.org>
> Cc: Russell King <linux@...linux.org.uk>
> 
> Stephen Boyd (9):
>    clkdev: Hold clocks_mutex while iterating clocks list
>    clkdev: Move clk creation outside of 'clocks_mutex'
>    clk: Prepare for clk registration API that uses DT nodes
>    driver core: Let dev_of_node() accept a NULL dev
>    clk: Add of_clk_hw_register() API for early clk drivers
>    clk: Allow parents to be specified without string names
>    clk: Look for parents with clkdev based clk_lookups
>    clk: Allow parents to be specified via clkspec index
>    clk: fixed-factor: Let clk framework find parent
> 
>   drivers/clk/clk-fixed-factor.c |  53 ++++--
>   drivers/clk/clk.c              | 326 +++++++++++++++++++++++++--------
>   drivers/clk/clk.h              |   2 +
>   drivers/clk/clkdev.c           |  30 +--
>   include/linux/clk-provider.h   |  22 +++
>   include/linux/device.h         |   2 +-
>   6 files changed, 327 insertions(+), 108 deletions(-)
> 
> 
> base-commit: 9e98c678c2d6ae3a17cb2de55d17f69dddaa231b
> 

Tested-by: Jeffrey Hugo <jhugo@...eaurora.org>

-- 
Jeffrey Hugo
Qualcomm Datacenter Technologies as an affiliate of Qualcomm 
Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.