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[31.187.140.150]) by smtp.gmail.com with ESMTPSA id rp9-20020a170906d96900b0099e05fb8f95sm5203102ejb.137.2023.09.17.10.27.28 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 17 Sep 2023 10:27:28 -0700 (PDT) Message-ID: <6e163f4d-061d-3c20-4c2e-44c74d529f10@linaro.org> Date: Sun, 17 Sep 2023 19:27:27 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.15.0 Subject: Re: [PATCH 1/2] Documentation: dt-bindings: media: i2c: Add ROHM BU64754 bindings To: Kieran Bingham , linux-media@vger.kernel.org Cc: Mauro Carvalho Chehab , Rob Herring , Krzysztof Kozlowski , Conor Dooley , OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS , open list References: <20230915165946.4183839-1-kieran.bingham@ideasonboard.com> <20230915165946.4183839-2-kieran.bingham@ideasonboard.com> <22bc83c7-17c3-f8a0-b1de-5d6b2e1e29b2@linaro.org> <169494678738.1922990.10472250640303677004@ping.linuxembedded.co.uk> Content-Language: en-US From: Krzysztof Kozlowski In-Reply-To: <169494678738.1922990.10472250640303677004@ping.linuxembedded.co.uk> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 17/09/2023 12:33, Kieran Bingham wrote: > Quoting Krzysztof Kozlowski (2023-09-17 10:37:07) >> On 15/09/2023 18:59, Kieran Bingham wrote: >>> Add YAML device tree bindings for the ROHM BU64754 VCM Motor Driver for >>> Camera Autofocus. >>> >>> Signed-off-by: Kieran Bingham >>> --- >> >> ... >> >>> +properties: >>> + compatible: >>> + items: >>> + - enum: >>> + - rohm,bu64754 >>> + >>> + reg: >>> + maxItems: 1 >>> + >>> + vdd-supply: >> >> If the supply is not required, how the driver gets any power? > > It may not be controllable. It could be wired to be always on. That's different. You talk now about board, I am talking about device. Is the supply required for the device? If yes, then it should be required by the bindings. > > The device has a low power mode which is controllable by software, so it > could be always powered on and controlled via software only if desired. > The driver handles that already as if the regulator isn't specified the > power down register bits will be set to put it in low power mode. Best regards, Krzysztof