From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dan Murphy Subject: Re: [PATCH] regmap: Allow read_reg_mask to be 0 Date: Tue, 30 Sep 2014 15:19:20 -0500 Message-ID: <542B1048.3020902@ti.com> References: <1412093220-24690-1-git-send-email-dmurphy@ti.com> <20140930172543.GG4273@sirena.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset="windows-1252" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20140930172543.GG4273@sirena.org.uk> Sender: linux-kernel-owner@vger.kernel.org To: Mark Brown Cc: gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org List-Id: linux-omap@vger.kernel.org Mark Thanks for the review On 09/30/2014 12:25 PM, Mark Brown wrote: > On Tue, Sep 30, 2014 at 11:07:00AM -0500, Dan Murphy wrote: > >> - if (config->read_flag_mask || config->write_flag_mask) { >> + if (config->read_flag_mask == REGMAP_NO_READ_MASK) >> + map->read_flag_mask = 0x00; >> + else if (config->read_flag_mask) > This breaks the symmetry in handling of read and write masks which isn't > great, please make the equivalent update for the write mask too. Hmmm. If I make the similar change for the write mask I will be adding dead code as write_flag_mask is not defaulted by the bus like the read_flag_mask which is defaulted to 0x80 in the regmap-spi code. The i2c code does not make this assumption. The original code did not seem to have symmetry as the only instance that write_flag_mask is modified is if it is non-zero. Let me know what you think. I can add the code to make it more symmetrical but we may be adding code that is dead. If I remove the defaulted read_flag_mask value out of the spi driver then I will need to find every spi device that needs that flag and set it. IMHO that would be really messy and probably mess us some drivers. > >> +#define REGMAP_NO_READ_MASK 0xff > An actual out of band value might be preferable here though that'd > involve changing the type and more checking so perhaps inessential. Thought about making this -1 with a variable change but that seemed really drastic where a value of 0xff seems to be a value that no one should use. Dan -- ------------------ Dan Murphy