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d="scan'208";a="702172670" Received: from nithinks-mobl1.amr.corp.intel.com (HELO [10.209.80.104]) ([10.209.80.104]) by orsmga002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 May 2023 08:53:23 -0700 Message-ID: <650012a3-b455-8be5-fd6d-d0775e718e6a@linux.intel.com> Date: Thu, 18 May 2023 10:16:16 -0500 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Firefox/102.0 Thunderbird/102.11.0 Subject: Re: [PATCH 06/10] mfd: cs42l43: Add support for cs42l43 core driver Content-Language: en-US To: Charles Keepax , Krzysztof Kozlowski Cc: broonie@kernel.org, lee@kernel.org, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org, tglx@linutronix.de, maz@kernel.org, linus.walleij@linaro.org, vkoul@kernel.org, lgirdwood@gmail.com, yung-chuan.liao@linux.intel.com, sanyog.r.kale@intel.com, alsa-devel@alsa-project.org, patches@opensource.cirrus.com, devicetree@vger.kernel.org, linux-gpio@vger.kernel.org, linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org References: <20230512122838.243002-1-ckeepax@opensource.cirrus.com> <20230512122838.243002-7-ckeepax@opensource.cirrus.com> <73438e58-bd96-818d-1f43-5681b0d1a1de@linaro.org> <20230518102442.GZ68926@ediswmail.ad.cirrus.com> From: Pierre-Louis Bossart In-Reply-To: <20230518102442.GZ68926@ediswmail.ad.cirrus.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Message-ID-Hash: 3C45BI4HJWCBC5647L3UT3QHC6DJLUK5 X-Message-ID-Hash: 3C45BI4HJWCBC5647L3UT3QHC6DJLUK5 X-MailFrom: pierre-louis.bossart@linux.intel.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-alsa-devel.alsa-project.org-0; header-match-alsa-devel.alsa-project.org-1; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Mailman-Version: 3.3.8 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: >>> + ret = regmap_register_patch(cs42l43->regmap, cs42l43_reva_patch, >>> + ARRAY_SIZE(cs42l43_reva_patch)); >>> + if (ret) { >>> + dev_err(cs42l43->dev, "Failed to apply register patch: %d\n", ret); >>> + goto err; >>> + } >>> + >>> + pm_runtime_mark_last_busy(cs42l43->dev); >>> + pm_runtime_put_autosuspend(cs42l43->dev); >>> + >>> + ret = devm_mfd_add_devices(cs42l43->dev, PLATFORM_DEVID_NONE, >>> + cs42l43_devs, ARRAY_SIZE(cs42l43_devs), >> >> I don't why adding devices is not in probe. They use the same regmap >> right? So there will be no problem in probing them from MFD probe. > > Well except SoundWire is a bit of a special boy, the hardware is > not necessarily available in probe, the hardware is only available > at some point later when the device attaches. Doing it this way all > of the attaching (and various detach/attach cycles the device needs > during configuration) are over by the time the child drivers bind, so > they don't all need special code to handle that. if the devices are added in the probe, then the regmap needs to be moved to cache-only and another special API would be needed to tell the MFD framework to turn the regmap cache-only off. But if it's the same regmap, the regmap cache is handled in the SoundWire update_status callback so maybe Krzysztof's proposal does work?