From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Kim, Milo" Subject: Re: [PATCH RESEND 00/16] Support TI LMU devices Date: Wed, 25 Nov 2015 17:51:06 +0900 Message-ID: <5655767A.8030003@ti.com> References: <1446441875-1256-1-git-send-email-milo.kim@ti.com> <20151102085924.GP4058@x1> <56385998.5080006@ti.com> <20151103083344.GA3503@x1> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8"; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20151103083344.GA3503@x1> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Lee Jones Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: devicetree@vger.kernel.org On 11/3/2015 5:33 PM, Lee Jones wrote: > On Tue, 03 Nov 2015, Kim, Milo wrote: > >> Hi Lee, >> >> On 11/2/2015 5:59 PM, Lee Jones wrote: >>>> drivers/video/backlight/Kconfig | 62 ++ >>>>> drivers/video/backlight/Makefile | 7 + >>>>> drivers/video/backlight/lm3532_bl.c | 183 +++++ >>>>> drivers/video/backlight/lm3631_bl.c | 129 ++++ >>>>> drivers/video/backlight/lm3632_bl.c | 125 ++++ >>>>> drivers/video/backlight/lm3633_bl.c | 210 ++++++ >>>>> drivers/video/backlight/lm3695_bl.c | 91 +++ >>>>> drivers/video/backlight/lm3697_bl.c | 187 +++++ >>>>> drivers/video/backlight/ti-lmu-backlight.c | 429 ++++++++++++ >>>>> drivers/video/backlight/ti-lmu-backlight.h | 152 +++++ >>> How different are all of these drivers? >>> >>> Can you create one driver that supports them all instead? >>> >> >> Thanks for your suggestion. >> >> 'ti-lmu-backlight' is the common part of lmxxxx_bl drivers. And each >> lmxxx_bl has its own operation functions by using ti_lmu_bl_ops. >> I've tried to make consolidated driver but it contained too much >> device specific code in one file. So I prefer simple drivers >> structure - 'common part' and 'device specific operations'. >> It would be appreciated if you could introduce better idea. > > I wish to avoid having to apply the patches to conduct my own analysis > of the files, as I am severely restricted on time. Can you tell me how > much duplicated code there is between the files? How many lines would > be saved by supporting all of the lm* drivers in a single file? > Now, consolidated driver is ready. It improves not only lines of code but also code size. Patch v2 will be sent soon. Lines of code ------------- 194 lines are saved in consolidated driver. Patch v1: 1420 (8 files*) Patch v2: 1226 (3 files**) * ti-lmu-backlight.c (429) ti-lmu-backlight.h (152) lm3532_bl.c (183) lm3631_bl.c (129) lm3632_bl.c (125) lm3633_bl.c (210) lm3695_bl.c (95) lm3697_bl.c (97) ** ti-lmu-backlight-core.c (649) ti-lmu-backlight-data.c (287) ti-lmu-backlight.h (290) Size ---- The text segment is decreased by removing duplicate instructions. Patch v1 text data bss dec hex filename 12202 720 40 12962 32a2 drivers/video/backlight/built-in.o Patch v2 text data bss dec hex filename 6883 712 41 7636 1dd4 drivers/video/backlight/built-in.o Test environment ---------------- - Kernel version: 4.4.0-rc2 (linux-next) - backlight/built-in.o includes backlight core and ti-lmu-backlight drivers. No other backlight drivers included. Change details will be described in the patch-set. Best regards, Milo -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html