From: Jonathan Cameron <jic23@kernel.org>
To: Billy Tsai <billy_tsai@aspeedtech.com>
Cc: "lars@metafoo.de" <lars@metafoo.de>,
"pmeerw@pmeerw.net" <pmeerw@pmeerw.net>,
"robh+dt@kernel.org" <robh+dt@kernel.org>,
"joel@jms.id.au" <joel@jms.id.au>,
"andrew@aj.id.au" <andrew@aj.id.au>,
"p.zabel@pengutronix.de" <p.zabel@pengutronix.de>,
"lgirdwood@gmail.com" <lgirdwood@gmail.com>,
"broonie@kernel.org" <broonie@kernel.org>,
"linux-iio@vger.kernel.org" <linux-iio@vger.kernel.org>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"linux-aspeed@lists.ozlabs.org" <linux-aspeed@lists.ozlabs.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
BMC-SW <BMC-SW@aspeedtech.com>
Subject: Re: [RESEND v4 12/15] iio: adc: aspeed: Add func to set sampling rate.
Date: Mon, 30 Aug 2021 10:52:13 +0100 [thread overview]
Message-ID: <20210830105213.25ee20a2@jic23-huawei> (raw)
In-Reply-To: <FE947284-E67B-49DB-B538-3ECAD8317BD4@aspeedtech.com>
On Mon, 30 Aug 2021 08:35:53 +0000
Billy Tsai <billy_tsai@aspeedtech.com> wrote:
> Hi Jonathan,
>
> On 2021/8/29, 11:33 PM, "Jonathan Cameron" <jic23@kernel.org> wrote:
>
> On Tue, 24 Aug 2021 17:12:40 +0800
> Billy Tsai <billy_tsai@aspeedtech.com> wrote:
>
> >> Add the function to set the sampling rate and keep the sampling period
> >> for a driver used to wait the lastest value.
> >>
> >> Signed-off-by: Billy Tsai <billy_tsai@aspeedtech.com>
>
> > Why move the code as well as factoring out the setter function?
> > I doubt it does any harm, but I'd like to understand why you did it.
>
> > Jonathan
>
> >> + ret = clk_prepare_enable(data->clk_scaler->clk);
> >> + if (ret)
> >> + return ret;
> >> +
> >> + ret = devm_add_action_or_reset(data->dev,
> >> + aspeed_adc_clk_disable_unprepare,
> >> + data->clk_scaler->clk);
> >> + if (ret)
> >> + return ret;
> >> +
> >> + ret = aspeed_adc_set_sampling_rate(indio_dev, ASPEED_ADC_DEF_SAMPLING_RATE);
> >> + if (ret)
> >> + return ret;
> >> +
> >> ret = aspeed_adc_vref_config(indio_dev);
> >> if (ret)
> >> return ret;
> >> @@ -413,16 +445,6 @@ static int aspeed_adc_probe(struct platform_device *pdev)
> >> }
> >>
> >> /* Start all channels in normal mode. */
>
> > Why move this code up?
>
> Because the ADC clock is required when initializing the ADC device.
> In our system, the clock is always on. Thus, the legacy driver won't encounter any issues.
> I move the clk_prepare_enable ahead of initializing phase for making the driver probe logically closer to the hardware.
Thanks. Please add something to the patch description to say this.
Jonathan
>
> >> - ret = clk_prepare_enable(data->clk_scaler->clk);
> >> - if (ret)
> >> - return ret;
> >> -
> >> - ret = devm_add_action_or_reset(data->dev,
> >> - aspeed_adc_clk_disable_unprepare,
> >> - data->clk_scaler->clk);
> >> - if (ret)
> >> - return ret;
> >> -
> >> adc_engine_control_reg_val =
> >> readl(data->base + ASPEED_REG_ENGINE_CONTROL);
> >> adc_engine_control_reg_val |=
>
>
> Best Regards,
> Billy Tsai
>
next prev parent reply other threads:[~2021-08-30 9:49 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-24 9:12 [RESEND v4 00/15] Add support for ast2600 ADC Billy Tsai
2021-08-24 9:12 ` [RESEND v4 01/15] dt-bindings: iio: adc: Add ast2600-adc bindings Billy Tsai
2021-08-24 9:12 ` [RESEND v4 02/15] iio: adc: aspeed: completes the bitfield declare Billy Tsai
2021-08-29 15:07 ` Jonathan Cameron
2021-08-24 9:12 ` [RESEND v4 03/15] iio: adc: aspeed: set driver data when adc probe Billy Tsai
2021-08-29 15:08 ` Jonathan Cameron
2021-08-24 9:12 ` [RESEND v4 04/15] iio: adc: aspeed: Keep model data to driver data Billy Tsai
2021-08-24 9:12 ` [RESEND v4 05/15] iio: adc: aspeed: Refactory model data structure Billy Tsai
2021-08-29 15:13 ` Jonathan Cameron
2021-08-24 9:12 ` [RESEND v4 06/15] iio: adc: aspeed: Add vref config function Billy Tsai
2021-08-24 9:12 ` [RESEND v4 07/15] iio: adc: aspeed: Set num_channels with model data Billy Tsai
2021-08-24 9:12 ` [RESEND v4 08/15] iio: adc: aspeed: Use model_data to set clk scaler Billy Tsai
2021-08-24 9:12 ` [RESEND v4 09/15] iio: adc: aspeed: Use devm_add_action_or_reset Billy Tsai
2021-08-24 9:12 ` Billy Tsai
2021-08-24 9:12 ` [RESEND v4 10/15] iio: adc: aspeed: Support ast2600 adc Billy Tsai
2021-08-29 15:31 ` Jonathan Cameron
2021-08-24 9:12 ` [RESEND v4 11/15] iio: adc: aspeed: Fix the calculate error of clock Billy Tsai
2021-08-29 15:33 ` Jonathan Cameron
2021-08-24 9:12 ` [RESEND v4 12/15] iio: adc: aspeed: Add func to set sampling rate Billy Tsai
2021-08-24 9:12 ` [RESEND v4 13/15] iio: adc: aspeed: Add compensation phase Billy Tsai
2021-08-24 9:12 ` [RESEND v4 14/15] iio: adc: aspeed: Support battery sensing Billy Tsai
2021-08-24 9:12 ` [RESEND v4 15/15] iio: adc: aspeed: Get and set trimming data Billy Tsai
[not found] ` <202108250006.17P06IgG097015@twspam01.aspeedtech.com>
2021-08-29 15:20 ` [RESEND v4 08/15] iio: adc: aspeed: Use model_data to set clk scaler Jonathan Cameron
[not found] ` <202108250004.17P04FdD094082@twspam01.aspeedtech.com>
2021-08-29 15:25 ` [RESEND v4 09/15] iio: adc: aspeed: Use devm_add_action_or_reset Jonathan Cameron
[not found] ` <202108250003.17P03KRU092474@twspam01.aspeedtech.com>
2021-08-29 15:36 ` [RESEND v4 12/15] iio: adc: aspeed: Add func to set sampling rate Jonathan Cameron
2021-08-30 8:35 ` Billy Tsai
2021-08-30 9:52 ` Jonathan Cameron [this message]
[not found] ` <202108250006.17P066YP096721@twspam01.aspeedtech.com>
2021-08-29 15:39 ` [RESEND v4 13/15] iio: adc: aspeed: Add compensation phase Jonathan Cameron
[not found] ` <202108250005.17P05agj096445@twspam01.aspeedtech.com>
2021-08-29 15:43 ` [RESEND v4 14/15] iio: adc: aspeed: Support battery sensing Jonathan Cameron
[not found] ` <202108250007.17P07NFj097422@twspam01.aspeedtech.com>
2021-08-29 15:45 ` [RESEND v4 15/15] iio: adc: aspeed: Get and set trimming data Jonathan Cameron
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