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AJvYcCVKD6N9oIF55vL7Bu77F9UTi6+LGY5OJPU48DEGcB6p14iG7Yi7t6DCRCjkFKXSOvuRzG1BPRPquK5ZBEOwWHMft2Oez4e3JgFR X-Gm-Message-State: AOJu0YxX446h4F2h4Lq6UZut3/J90TLAVRWJZ385Nv78RsxhPoolbxxY jIE6N8AaLo0IV5hLLMd/TwY0c0GH4lORvzK42exErI7yN40xq3JXGJZxBBUULG4= X-Google-Smtp-Source: AGHT+IGTPNA2s+cNW2f69+8kmFELCsr7npIzZBbuC3yWFsocerzVeG9BMezpjpbwoOvRtOjCVaH9Zw== X-Received: by 2002:a05:651c:b06:b0:2f3:f1a7:9813 with SMTP id 38308e7fff4ca-2f3f1a79bf2mr1817831fa.43.1724138704232; Tue, 20 Aug 2024 00:25:04 -0700 (PDT) Received: from [192.168.50.4] ([82.78.167.177]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-5bf0b0cc99fsm684362a12.49.2024.08.20.00.25.02 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 20 Aug 2024 00:25:03 -0700 (PDT) Message-ID: Date: Tue, 20 Aug 2024 10:25:01 +0300 Precedence: bulk X-Mailing-List: linux-i2c@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 05/11] i2c: riic: Add suspend/resume support Content-Language: en-US To: Andi Shyti Cc: chris.brandt@renesas.com, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, geert+renesas@glider.be, magnus.damm@gmail.com, p.zabel@pengutronix.de, wsa+renesas@sang-engineering.com, linux-renesas-soc@vger.kernel.org, linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Claudiu Beznea References: <20240819102348.1592171-1-claudiu.beznea.uj@bp.renesas.com> <20240819102348.1592171-6-claudiu.beznea.uj@bp.renesas.com> From: claudiu beznea In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Hi, Andi, On 19.08.2024 22:37, Andi Shyti wrote: > Hi Claudiu, > > On Mon, Aug 19, 2024 at 01:23:42PM GMT, Claudiu wrote: >> From: Claudiu Beznea >> >> Add suspend/resume support for the RIIC driver. This is necessary for the >> Renesas RZ/G3S SoC which support suspend to deep sleep state where power >> to most of the SoC components is turned off. As a result the I2C controller >> needs to be reconfigured after suspend/resume. For this, the reset line >> was stored in the driver private data structure as well as i2c timings. >> The reset line and I2C timings are necessary to re-initialize the >> controller after resume. >> >> Signed-off-by: Claudiu Beznea > > This patch doesn't have tags, so I'll add mine :-) > > Reviewed-by: Andi Shyti > > Just one thing, though... > > ... > >> +static int riic_i2c_resume(struct device *dev) >> +{ >> + struct riic_dev *riic = dev_get_drvdata(dev); >> + int ret; >> + >> + ret = reset_control_deassert(riic->rstc); >> + if (ret) >> + return ret; >> + >> + ret = riic_init_hw(riic); >> + if (ret) { >> + reset_control_assert(riic->rstc); >> + return ret; > > Can I add a comment here saying: > > /* > * Since the driver remains loaded after resume, > * we want the reset line to be asserted. > */ Sure, thank you! > reset_control_assert(riic->rstc); > > Unless I missed the point :-) > > Thanks, > Andi