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From: Geert Uytterhoeven <geert@linux-m68k.org>
To: Alex Riesen <alexander.riesen@cetitec.com>,
	Geert Uytterhoeven <geert@linux-m68k.org>,
	Kieran Bingham <kieran.bingham@ideasonboard.com>,
	Mauro Carvalho Chehab <mchehab@kernel.org>,
	Hans Verkuil <hverkuil-cisco@xs4all.nl>,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	Rob Herring <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	driverdevel <devel@driverdev.osuosl.org>,
	Linux Media Mailing List <linux-media@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
	<devicetree@vger.kernel.org>,
	Linux-Renesas <linux-renesas-soc@vger.kernel.org>
Subject: Re: [PATCH 8/8] arm64: dts: renesas: salvator: add a connection from adv748x codec (HDMI input) to the R-Car SoC
Date: Mon, 2 Mar 2020 17:13:30 +0100	[thread overview]
Message-ID: <CAMuHMdVNGsVHyvAgC5dAHx=8Ax18EHx2tS6Hm5Bkg4ms=mW6Zw@mail.gmail.com> (raw)
In-Reply-To: <20200302160906.GC3717@pflmari>

Hi Alex,

On Mon, Mar 2, 2020 at 5:09 PM Alex Riesen <alexander.riesen@cetitec.com> wrote:
> Geert Uytterhoeven, Mon, Mar 02, 2020 16:32:32 +0100:
> > > And this absence of documentation also means that whatever clocks (both input
> > > in "clocks=" and output in "#clock-cells") listed in a specific .dts are just
> > > an integration detail?
> >
> > No, the absence probably means that any clock-related properties in a .dts
> > file will just be ignored.
> >
> > Looking at the driver source, it indeed has no support related to clocks at all.
>
> ...
>
> > > Does this below makes more sense, than?
> > >
> > >     video-receiver@70 {
> > >         compatible = "adi,adv7482";
> > >         clocks = <&rcar_sound 3>;
> > >         clock-names = "clk-hdmi-video";
> > >         adv748x_mclk: mclk {
> > >             compatible = "fixed-clock";
> > >             #clock-cells =  <0>;
> > >             /* frequency hard-coded for illustration */
> > >             clock-frequency = <12288000>;
> > >             clock-output-names = "clk-hdmi-i2s-mclk";
> > >         };
> > >     };
> >
> > The #clock-cells should be in the main video-receiver node.
> > Probably there is more than one clock output, so #clock-cells may be 1?
>
> AFAICS, the device can provide only this one clock line (audio master clock
> for I2S output)... I shall re-check, just in case.
>
> > There is no need for a fixed-clock compatible, nor for clock-frequency
> > and clock-output-names.
> >
> > But most important: this should be documented in the adv748x DT bindings,
> > and implemented in the adv748x driver.
>
> So if the driver is to export that clock for the kernel (like in this case),
> it must implement its support?

Exactly.  Unless that pin is hardcoded to output a fixed clock, in which case
you can just override the existing audio_clk_c rate.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

WARNING: multiple messages have this Message-ID
From: Geert Uytterhoeven <geert@linux-m68k.org>
To: Alex Riesen <alexander.riesen@cetitec.com>,
	Geert Uytterhoeven <geert@linux-m68k.org>,
	 Kieran Bingham <kieran.bingham@ideasonboard.com>,
	 Mauro Carvalho Chehab <mchehab@kernel.org>,
	Hans Verkuil <hverkuil-cisco@xs4all.nl>,
	 Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	Rob Herring <robh+dt@kernel.org>,
	 Mark Rutland <mark.rutland@arm.com>,
	driverdevel <devel@driverdev.osuosl.org>,
	 Linux Media Mailing List <linux-media@vger.kernel.org>,
	 Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	 "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
	<devicetree@vger.kernel.org>,
	 Linux-Renesas <linux-renesas-soc@vger.kernel.org>
Subject: Re: [PATCH 8/8] arm64: dts: renesas: salvator: add a connection from adv748x codec (HDMI input) to the R-Car SoC
Date: Mon, 2 Mar 2020 17:13:30 +0100	[thread overview]
Message-ID: <CAMuHMdVNGsVHyvAgC5dAHx=8Ax18EHx2tS6Hm5Bkg4ms=mW6Zw@mail.gmail.com> (raw)
In-Reply-To: <20200302160906.GC3717@pflmari>

Hi Alex,

On Mon, Mar 2, 2020 at 5:09 PM Alex Riesen <alexander.riesen@cetitec.com> wrote:
> Geert Uytterhoeven, Mon, Mar 02, 2020 16:32:32 +0100:
> > > And this absence of documentation also means that whatever clocks (both input
> > > in "clocks=" and output in "#clock-cells") listed in a specific .dts are just
> > > an integration detail?
> >
> > No, the absence probably means that any clock-related properties in a .dts
> > file will just be ignored.
> >
> > Looking at the driver source, it indeed has no support related to clocks at all.
>
> ...
>
> > > Does this below makes more sense, than?
> > >
> > >     video-receiver@70 {
> > >         compatible = "adi,adv7482";
> > >         clocks = <&rcar_sound 3>;
> > >         clock-names = "clk-hdmi-video";
> > >         adv748x_mclk: mclk {
> > >             compatible = "fixed-clock";
> > >             #clock-cells =  <0>;
> > >             /* frequency hard-coded for illustration */
> > >             clock-frequency = <12288000>;
> > >             clock-output-names = "clk-hdmi-i2s-mclk";
> > >         };
> > >     };
> >
> > The #clock-cells should be in the main video-receiver node.
> > Probably there is more than one clock output, so #clock-cells may be 1?
>
> AFAICS, the device can provide only this one clock line (audio master clock
> for I2S output)... I shall re-check, just in case.
>
> > There is no need for a fixed-clock compatible, nor for clock-frequency
> > and clock-output-names.
> >
> > But most important: this should be documented in the adv748x DT bindings,
> > and implemented in the adv748x driver.
>
> So if the driver is to export that clock for the kernel (like in this case),
> it must implement its support?

Exactly.  Unless that pin is hardcoded to output a fixed clock, in which case
you can just override the existing audio_clk_c rate.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel

  reply	other threads:[~2020-03-02 16:13 UTC|newest]

Thread overview: 62+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-13 14:19 [PATCH 0/8] media: i2c: adv748x: add support for HDMI audio Alex Riesen
2020-01-13 14:19 ` Alex Riesen
2020-01-13 14:15 ` [PATCH 1/8] media: adv748x: add a device-specific wrapper for register block read Alex Riesen
2020-01-13 14:15   ` Alex Riesen
2020-01-13 14:15 ` [PATCH 2/8] media: adv748x: add audio mute control and output selection ioctls Alex Riesen
2020-01-13 14:15   ` Alex Riesen
2020-03-13  8:16   ` Hans Verkuil
2020-03-13  8:16     ` Hans Verkuil
2020-03-13 10:26     ` Alex Riesen
2020-03-13 10:26       ` Alex Riesen
2020-03-13 10:52       ` Hans Verkuil
2020-03-13 10:52         ` Hans Verkuil
2020-03-13 11:00         ` Alex Riesen
2020-03-13 11:00           ` Alex Riesen
2020-01-13 14:15 ` [PATCH 3/8] media: adv748x: add log_status ioctl Alex Riesen
2020-01-13 14:15   ` Alex Riesen
2020-01-13 14:15 ` [PATCH 4/8] media: adv748x: reserve space for the audio (I2S) port in the driver structures Alex Riesen
2020-01-13 14:15   ` Alex Riesen
2020-01-13 14:15 ` [PATCH 5/8] media: adv748x: add an ASoC DAI definition to the driver Alex Riesen
2020-01-13 14:15   ` Alex Riesen
2020-01-13 14:15 ` [PATCH 6/8] media: adv748x: reduce amount of code for bitwise modification of device registers Alex Riesen
2020-01-13 14:15   ` Alex Riesen
2020-01-13 14:15 ` [PATCH 7/8] dt-bindings: adv748x: add information about serial audio interface (I2S/TDM) Alex Riesen
2020-01-13 14:15   ` Alex Riesen
2020-01-13 22:32   ` Rob Herring
2020-01-13 22:32     ` Rob Herring
2020-01-13 14:15 ` [PATCH 8/8] arm64: dts: renesas: salvator: add a connection from adv748x codec (HDMI input) to the R-Car SoC Alex Riesen
2020-01-13 14:15   ` Alex Riesen
2020-03-02 12:28   ` Geert Uytterhoeven
2020-03-02 12:28     ` Geert Uytterhoeven
2020-03-02 13:40     ` Alex Riesen
2020-03-02 13:40       ` Alex Riesen
2020-03-02 13:47       ` Geert Uytterhoeven
2020-03-02 13:47         ` Geert Uytterhoeven
2020-03-02 15:07         ` Alex Riesen
2020-03-02 15:07           ` Alex Riesen
2020-03-02 15:32           ` Geert Uytterhoeven
2020-03-02 15:32             ` Geert Uytterhoeven
2020-03-02 16:09             ` Alex Riesen
2020-03-02 16:09               ` Alex Riesen
2020-03-02 16:13               ` Geert Uytterhoeven [this message]
2020-03-02 16:13                 ` Geert Uytterhoeven
2020-03-05 14:36                 ` Alex Riesen
2020-03-05 14:36                   ` Alex Riesen
2020-03-06 12:21                   ` Geert Uytterhoeven
2020-03-06 12:21                     ` Geert Uytterhoeven
2020-03-06 13:16                   ` Laurent Pinchart
2020-03-06 13:16                     ` Laurent Pinchart
2020-03-06 13:41                     ` Alex Riesen
2020-03-06 13:41                       ` Alex Riesen
2020-03-06 13:45                       ` Laurent Pinchart
2020-03-06 13:45                         ` Laurent Pinchart
2020-03-09  1:31                         ` Kuninori Morimoto
2020-03-09  1:31                           ` Kuninori Morimoto
2020-03-09 11:09                           ` Alex Riesen
2020-03-09 11:09                             ` Alex Riesen
2020-03-10  1:07                             ` Kuninori Morimoto
2020-03-10  1:07                               ` Kuninori Morimoto
2020-03-10  8:17                               ` Alex Riesen
2020-03-10  8:17                                 ` Alex Riesen
2020-03-10 10:39                                 ` Laurent Pinchart
2020-03-10 10:39                                   ` Laurent Pinchart

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