linux-kernel - Re: [PATCH 0/9] added helper macros to remove duplicate code from probe functions of the platform drivers

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Date:   Wed, 18 Sep 2019 15:57:15 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Satendra Singh Thakur <sst2005@...il.com>
Cc:     dan.j.williams@...el.com, jun.nie@...aro.org, shawnguo@...nel.org,
        agross@...nel.org, sean.wang@...iatek.com, matthias.bgg@...il.com,
        maxime.ripard@...tlin.com, wens@...e.org, lars@...afoo.de,
        afaerber@...e.de, manivannan.sadhasivam@...aro.org,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, satendrasingh.thakur@....com
Subject: Re: [PATCH 0/9] added helper macros to remove duplicate code from
 probe functions of the platform drivers

On 15-09-19, 12:30, Satendra Singh Thakur wrote:
> 1. For most of the platform drivers's probe include following steps
> 
> -memory allocation for driver's private structure
> -getting io resources
> -io remapping resources
> -getting irq number
> -registering irq
> -setting driver's private data
> -getting clock
> -preparing and enabling clock

And we have perfect set of APIs for these tasks!

> 2. We have defined a set of macros to combine some or all of
> the above mentioned steps. This will remove redundant/duplicate
> code in drivers' probe functions of platform drivers.

Why, how does it help and you do realize it also introduces bugs

> devm_platform_probe_helper(pdev, priv, clk_name);
> devm_platform_probe_helper_clk(pdev, priv, clk_name);
> devm_platform_probe_helper_irq(pdev, priv, clk_name,
> irq_hndlr, irq_flags, irq_name, irq_devid);
> devm_platform_probe_helper_all(pdev, priv, clk_name,
> irq_hndlr, irq_flags, irq_name, irq_devid);
> devm_platform_probe_helper_all_data(pdev, priv, clk_name,
> irq_hndlr, irq_flags, irq_name, irq_devid);
> 
> 3. Code is made devres compatible (wherever required)
> The functions: clk_get, request_irq, kzalloc, platform_get_resource
> are replaced with their devm_* counterparts.

We already have devres APIs for people to use!
> 
> 4. Few bugs are also fixed.

Which ones..?

> 
> Satendra Singh Thakur (9):
>   probe/dma : added helper macros to remove redundant/duplicate code
>     from probe functions of the dma controller drivers
>   probe/dma/jz4740: removed redundant code from jz4740 dma controller's 
>        probe function
>   probe/dma/zx: removed redundant code from zx dma controller's probe
>     function
>   probe/dma/qcom-bam: removed redundant code from qcom bam dma
>     controller's probe function
>   probe/dma/mtk-hs: removed redundant code from mediatek hs dma
>     controller's probe function
>   probe/dma/sun6i: removed redundant code from sun6i dma controller's
>     probe function
>   probe/dma/sun4i: removed redundant code from sun4i dma controller's
>     probe function
>   probe/dma/axi: removed redundant code from axi dma controller's probe
>     function
>   probe/dma/owl: removed redundant code from owl dma controller's probe
>     function
> 
>  drivers/dma/dma-axi-dmac.c       |  28 ++---
>  drivers/dma/dma-jz4740.c         |  33 +++---
>  drivers/dma/mediatek/mtk-hsdma.c |  38 +++----
>  drivers/dma/owl-dma.c            |  29 ++---
>  drivers/dma/qcom/bam_dma.c       |  71 +++++-------
>  drivers/dma/sun4i-dma.c          |  30 ++----
>  drivers/dma/sun6i-dma.c          |  30 ++----
>  drivers/dma/zx_dma.c             |  35 ++----
>  include/linux/probe-helper.h     | 179 +++++++++++++++++++++++++++++++
>  9 files changed, 280 insertions(+), 193 deletions(-)
>  create mode 100644 include/linux/probe-helper.h
> 
> -- 
> 2.17.1

-- 
~Vinod