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[86.49.110.70]) by smtp.gmail.com with ESMTPSA id 12sm17306318wme.25.2019.03.08.05.52.52 (version=TLS1_3 cipher=AEAD-AES128-GCM-SHA256 bits=128/128); Fri, 08 Mar 2019 05:52:53 -0800 (PST) Subject: Re: [PATCH] ARM: dts: alt: Add DA9063 PMIC node To: Simon Horman , Wolfram Sang References: <20190303190059.31155-1-marek.vasut@gmail.com> <20190304105705.GA1000@kunai> <20190304111349.GB1000@kunai> <20190308134043.alpxgnujj6ppmczc@verge.net.au> From: Marek Vasut Openpgp: preference=signencrypt Message-ID: <5a7b34bf-8ae7-a8a0-c1fc-911a9941dae9@gmail.com> Date: Fri, 8 Mar 2019 14:52:50 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: <20190308134043.alpxgnujj6ppmczc@verge.net.au> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190308_055256_282692_8635AABC X-CRM114-Status: GOOD ( 18.99 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Geert Uytterhoeven , Linux-Renesas , Wolfram Sang , Geert Uytterhoeven , Linux ARM , Marek Vasut Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 3/8/19 2:40 PM, Simon Horman wrote: > On Mon, Mar 04, 2019 at 12:13:49PM +0100, Wolfram Sang wrote: >> On Mon, Mar 04, 2019 at 11:59:48AM +0100, Marek Vasut wrote: >>> On 3/4/19 11:57 AM, Wolfram Sang wrote: >>>> >>>>>> Add DA9063 PMIC node to the I2C bus. >>>>>> >>>>>> Signed-off-by: Marek Vasut >>>>> >>>>> Thanks for your patch! >>>>> >>>>> Reviewed-by: Geert Uytterhoeven >>>> >>>> Thanks for CCing me, I didn't get and missed the original patch. >>>> >>>>>> +++ b/arch/arm/boot/dts/r8a7794-alt.dts >>>>>> @@ -377,6 +377,27 @@ >>>>>> pinctrl-names = "i2c-exio4"; >>>>>> }; >>>>>> >>>>>> +&i2c7 { >>>>>> + status = "okay"; >>>>>> + clock-frequency = <100000>; >>>>> >>>>> According to the DA9063 datasheet, the PMIC supports up to 400 kHz. >>>>> It looks like there are no other devices on the bus. >>>>> >>>>> Wolfram, what's your stance on this? >>>> >>>> Yes, please. I thought this was standard on Gen2 IIC_DVFS busses, but >>>> seems not. Probably it slipped through the cracks. >>> >>> Do we want to update all of the other boards too ? >>> >>> I'd be cautious about the DVFS I2C, running faster while talking to the >>> PMIC and reading/writing a few registers brings little benefit, while >>> the signal integrity might be impacted. >> >> Can be argued. I think if we would apply some testing on top of this >> change, we will find that it will work. But we would in deed need this >> testing as verification, and this is not our top priority project. But >> if someone feels like running some i2c dumping over night, well, >> why not.. > > Thanks, > > I've applied this patch for v5.2. > We can do a sweep of frequency updates as a follow-up if we decide > that is the right way to go. Do we really want to speed up the PMIC I2C bus ? What are the pros (none?) and cons (might be unstable) ? -- Best regards, Marek Vasut _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel