From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pierre-Louis Bossart Subject: Re: [alsa-devel] [PATCH v2] ASoC: da7219: read fmw property to get mclk for non-dts systems Date: Tue, 1 May 2018 10:59:57 -0500 Message-ID: References: <1525080203-18947-1-git-send-email-akshu.agrawal@amd.com> <43c7939d-e30b-27eb-59e4-c0e16248dad1@amd.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Return-path: In-Reply-To: <43c7939d-e30b-27eb-59e4-c0e16248dad1@amd.com> Content-Language: en-US Sender: linux-kernel-owner@vger.kernel.org To: "Agrawal, Akshu" Cc: "moderated list:SOUND" , Support Opensource , Liam Girdwood , open list , Takashi Iwai , djkurtz@chromium.org, Mark Brown , Alexander.Deucher@amd.com, Adam.Thomson.Opensource@diasemi.com List-Id: alsa-devel@alsa-project.org On 5/1/18 9:31 AM, Agrawal, Akshu wrote: > > > On 4/30/2018 9:54 PM, Pierre-Louis Bossart wrote: >> On 4/30/18 4:23 AM, Akshu Agrawal wrote: >>> Non-dts based systems can use ACPI DSDT to pass on the mclk >>> to da7219. >>> This enables da7219 mclk to be linked to system clock. >>> Enable/Disable of the mclk is already handled in the codec so >>> platform drivers don't have to explicitly do handling of mclk. >>> >>> Signed-off-by: Akshu Agrawal >>> --- >>> v2: Fixed kbuild error >>>   include/sound/da7219.h    | 2 ++ >>>   sound/soc/codecs/da7219.c | 7 ++++++- >>>   2 files changed, 8 insertions(+), 1 deletion(-) >>> >>> diff --git a/include/sound/da7219.h b/include/sound/da7219.h >>> index 1bfcb16..df7ddf4 100644 >>> --- a/include/sound/da7219.h >>> +++ b/include/sound/da7219.h >>> @@ -38,6 +38,8 @@ struct da7219_pdata { >>>       const char *dai_clks_name; >>> +    const char *mclk_name; >>> + >>>       /* Mic */ >>>       enum da7219_micbias_voltage micbias_lvl; >>>       enum da7219_mic_amp_in_sel mic_amp_in_sel; >>> diff --git a/sound/soc/codecs/da7219.c b/sound/soc/codecs/da7219.c >>> index 980a6a8..aed68a4 100644 >>> --- a/sound/soc/codecs/da7219.c >>> +++ b/sound/soc/codecs/da7219.c >>> @@ -1624,6 +1624,8 @@ static struct da7219_pdata >>> *da7219_fw_to_pdata(struct snd_soc_component *compone >>>           dev_warn(dev, "Using default clk name: %s\n", >>>                pdata->dai_clks_name); >>> +    device_property_read_string(dev, "dlg,mclk-name", >>> &pdata->mclk_name); >>> + >>>       if (device_property_read_u32(dev, "dlg,micbias-lvl", &of_val32) >>> >= 0) >>>           pdata->micbias_lvl = da7219_fw_micbias_lvl(dev, of_val32); >>>       else >>> @@ -1905,7 +1907,10 @@ static int da7219_probe(struct >>> snd_soc_component *component) >>>       da7219_handle_pdata(component); >>>       /* Check if MCLK provided */ >>> -    da7219->mclk = devm_clk_get(component->dev, "mclk"); >>> +    if (da7219->pdata->mclk_name) >>> +        da7219->mclk = clk_get(NULL, da7219->pdata->mclk_name); >>> +    if (!da7219->mclk) >>> +        da7219->mclk = devm_clk_get(component->dev, "mclk"); >> >> this looks weird, why are you using different clk functions depending >> on the existence of a _DSD property? Why not just change the name and >> keep the same flow, e.g something like >> >> if(!da7219->pdata->mclk_name) >>      da7219->pdata->mclk_name = "mclk"; >> da7219->mclk = devm_clk_get(component->dev, da7219->pdata->mclk_name); >> >> > > We can't use devm_clk_get as the value of dev argument has to be NULL, > which can not be used with devm_clk_get. > System clock which are linked to mclk are registered by a separate ACPI > device. And this exposing of DSD property is for all those platforms > which are non-dts based. Alternatively you could modify clk_get to use device_property instead of of_property. > >>>       if (IS_ERR(da7219->mclk)) { >>>           if (PTR_ERR(da7219->mclk) != -ENOENT) { >>>               ret = PTR_ERR(da7219->mclk); >>> >>