[PATCH V2 1/2] clk: imx6sx: add missing lvds2 clock to the clock tree

[PATCH V2 1/2] clk: imx6sx: add missing lvds2 clock to the clock tree

[Anson Huang]

i.MX6SX has lvds2 (analog clock2), an I/O clock like lvds1.
And this lvds2, along with lvds1, can be used to provide
external clock source to the internal pll, such as pll4_audio
and pll5_video.

This patch mainly adds the lvds2 to the clock tree and fix its
relationship with pll accordingly.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
---
 drivers/clk/imx/clk-imx6sx.c             | 8 ++++++--
 include/dt-bindings/clock/imx6sx-clock.h | 6 +++++-
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/clk/imx/clk-imx6sx.c b/drivers/clk/imx/clk-imx6sx.c
index e6d389e..478ad0d 100644
--- a/drivers/clk/imx/clk-imx6sx.c
+++ b/drivers/clk/imx/clk-imx6sx.c
@@ -80,7 +80,7 @@ static const char *lvds_sels[]	= {
 	"arm", "pll1_sys", "dummy", "dummy", "dummy", "dummy", "dummy", "pll5_video_div",
 	"dummy", "dummy", "pcie_ref_125m", "dummy", "usbphy1", "usbphy2",
 };
-static const char *pll_bypass_src_sels[] = { "osc", "lvds1_in", };
+static const char *pll_bypass_src_sels[] = { "osc", "lvds1_in", "lvds2_in", "dummy", };
 static const char *pll1_bypass_sels[] = { "pll1", "pll1_bypass_src", };
 static const char *pll2_bypass_sels[] = { "pll2", "pll2_bypass_src", };
 static const char *pll3_bypass_sels[] = { "pll3", "pll3_bypass_src", };
@@ -158,8 +158,9 @@ static void __init imx6sx_clocks_init(struct device_node *ccm_node)
 	clks[IMX6SX_CLK_IPP_DI0] = of_clk_get_by_name(ccm_node, "ipp_di0");
 	clks[IMX6SX_CLK_IPP_DI1] = of_clk_get_by_name(ccm_node, "ipp_di1");
 
-	/* Clock source from external clock via CLK1 PAD */
+	/* Clock source from external clock via CLK1/2 PAD */
 	clks[IMX6SX_CLK_ANACLK1] = imx_obtain_fixed_clock("anaclk1", 0);
+	clks[IMX6SX_CLK_ANACLK2] = imx_obtain_fixed_clock("anaclk2", 0);
 
 	np = of_find_compatible_node(NULL, NULL, "fsl,imx6sx-anatop");
 	base = of_iomap(np, 0);
@@ -228,7 +229,9 @@ static void __init imx6sx_clocks_init(struct device_node *ccm_node)
 	clks[IMX6SX_CLK_PCIE_REF_125M] = imx_clk_gate("pcie_ref_125m", "pcie_ref", base + 0xe0, 19);
 
 	clks[IMX6SX_CLK_LVDS1_OUT] = imx_clk_gate_exclusive("lvds1_out", "lvds1_sel", base + 0x160, 10, BIT(12));
+	clks[IMX6SX_CLK_LVDS2_OUT] = imx_clk_gate_exclusive("lvds2_out", "lvds2_sel", base + 0x160, 11, BIT(13));
 	clks[IMX6SX_CLK_LVDS1_IN]  = imx_clk_gate_exclusive("lvds1_in",  "anaclk1",   base + 0x160, 12, BIT(10));
+	clks[IMX6SX_CLK_LVDS2_IN]  = imx_clk_gate_exclusive("lvds2_in",  "anaclk2",   base + 0x160, 13, BIT(11));
 
 	clks[IMX6SX_CLK_ENET_REF] = clk_register_divider_table(NULL, "enet_ref", "pll6_enet", 0,
 			base + 0xe0, 0, 2, 0, clk_enet_ref_table,
@@ -270,6 +273,7 @@ static void __init imx6sx_clocks_init(struct device_node *ccm_node)
 
 	/*                                                name                reg           shift   width   parent_names       num_parents */
 	clks[IMX6SX_CLK_LVDS1_SEL]          = imx_clk_mux("lvds1_sel",        base + 0x160, 0,      5,      lvds_sels,         ARRAY_SIZE(lvds_sels));
+	clks[IMX6SX_CLK_LVDS2_SEL]          = imx_clk_mux("lvds2_sel",        base + 0x160, 5,      5,      lvds_sels,         ARRAY_SIZE(lvds_sels));
 
 	np = ccm_node;
 	base = of_iomap(np, 0);
diff --git a/include/dt-bindings/clock/imx6sx-clock.h b/include/dt-bindings/clock/imx6sx-clock.h
index 36f0324..cd2d6c5 100644
--- a/include/dt-bindings/clock/imx6sx-clock.h
+++ b/include/dt-bindings/clock/imx6sx-clock.h
@@ -275,6 +275,10 @@
 #define IMX6SX_PLL6_BYPASS		262
 #define IMX6SX_PLL7_BYPASS		263
 #define IMX6SX_CLK_SPDIF_GCLK		264
-#define IMX6SX_CLK_CLK_END		265
+#define IMX6SX_CLK_LVDS2_SEL		265
+#define IMX6SX_CLK_LVDS2_OUT		266
+#define IMX6SX_CLK_LVDS2_IN		267
+#define IMX6SX_CLK_ANACLK2		268
+#define IMX6SX_CLK_CLK_END		269
 
 #endif /* __DT_BINDINGS_CLOCK_IMX6SX_H */
-- 
2.7.4

[PATCH V2 2/2] ARM: dts: imx6sx-sabreauto: add external 24MHz clock source

[Anson Huang]

On i.MX6SX SabreAuto board, there is external 24MHz clock
source for analog clock2, add this clock source to clock tree.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
---
changes since V1:
	remove unnecessary clocks container.
 arch/arm/boot/dts/imx6sx-sabreauto.dts | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/arm/boot/dts/imx6sx-sabreauto.dts b/arch/arm/boot/dts/imx6sx-sabreauto.dts
index 72da5ac..a3b022b 100644
--- a/arch/arm/boot/dts/imx6sx-sabreauto.dts
+++ b/arch/arm/boot/dts/imx6sx-sabreauto.dts
@@ -18,6 +18,12 @@
 		reg = <0x80000000 0x80000000>;
 	};
 
+	codec_osc: anaclk2 {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+		clock-frequency = <24576000>;
+	};
+
 	regulators {
 		compatible = "simple-bus";
 		#address-cells = <1>;
-- 
2.7.4

Re: [PATCH V2 1/2] clk: imx6sx: add missing lvds2 clock to the clock tree

[Rob Herring]

On Mon, Mar 19, 2018 at 10:30:44AM +0800, Anson Huang wrote:
> i.MX6SX has lvds2 (analog clock2), an I/O clock like lvds1.
> And this lvds2, along with lvds1, can be used to provide
> external clock source to the internal pll, such as pll4_audio
> and pll5_video.
> 
> This patch mainly adds the lvds2 to the clock tree and fix its
> relationship with pll accordingly.
> 
> Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
> Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
> ---
>  drivers/clk/imx/clk-imx6sx.c             | 8 ++++++--
>  include/dt-bindings/clock/imx6sx-clock.h | 6 +++++-
>  2 files changed, 11 insertions(+), 3 deletions(-)

Reviewed-by: Rob Herring <robh@kernel.org>

Re: [PATCH V2 1/2] clk: imx6sx: add missing lvds2 clock to the clock tree

[Stephen Boyd]

Quoting Anson Huang (2018-03-18 19:30:44)
> i.MX6SX has lvds2 (analog clock2), an I/O clock like lvds1.
> And this lvds2, along with lvds1, can be used to provide
> external clock source to the internal pll, such as pll4_audio
> and pll5_video.
> 
> This patch mainly adds the lvds2 to the clock tree and fix its
> relationship with pll accordingly.
> 
> Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
> Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
> ---

Applied to clk-next

Re: [PATCH V2 2/2] ARM: dts: imx6sx-sabreauto: add external 24MHz clock source

[Shawn Guo]

On Mon, Mar 19, 2018 at 10:30:45AM +0800, Anson Huang wrote:
> On i.MX6SX SabreAuto board, there is external 24MHz clock
> source for analog clock2, add this clock source to clock tree.
> 
> Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
> ---
> changes since V1:
> 	remove unnecessary clocks container.

I understand this is suggested by Fabio, but I'm afraid that it's not
going to work with imx_obtain_fixed_clock() call, which is coded to
look for clocks under /clocks node.

Shawn

>  arch/arm/boot/dts/imx6sx-sabreauto.dts | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/imx6sx-sabreauto.dts b/arch/arm/boot/dts/imx6sx-sabreauto.dts
> index 72da5ac..a3b022b 100644
> --- a/arch/arm/boot/dts/imx6sx-sabreauto.dts
> +++ b/arch/arm/boot/dts/imx6sx-sabreauto.dts
> @@ -18,6 +18,12 @@
>  		reg = <0x80000000 0x80000000>;
>  	};
>  
> +	codec_osc: anaclk2 {
> +		#clock-cells = <0>;
> +		compatible = "fixed-clock";
> +		clock-frequency = <24576000>;
> +	};
> +
>  	regulators {
>  		compatible = "simple-bus";
>  		#address-cells = <1>;
> -- 
> 2.7.4
> 
> --
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Re: [PATCH V2 2/2] ARM: dts: imx6sx-sabreauto: add external 24MHz clock source

[Stephen Boyd]

Quoting Shawn Guo (2018-04-17 07:22:05)
> On Mon, Mar 19, 2018 at 10:30:45AM +0800, Anson Huang wrote:
> > On i.MX6SX SabreAuto board, there is external 24MHz clock
> > source for analog clock2, add this clock source to clock tree.
> > 
> > Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
> > ---
> > changes since V1:
> >       remove unnecessary clocks container.
> 
> I understand this is suggested by Fabio, but I'm afraid that it's not
> going to work with imx_obtain_fixed_clock() call, which is coded to
> look for clocks under /clocks node.
> 

Should patch #1 be dropped from clk tree?

RE: [PATCH V2 2/2] ARM: dts: imx6sx-sabreauto: add external 24MHz clock source

[Anson Huang]

Anson Huang
Best Regards!


> -----Original Message-----
> From: Stephen Boyd [mailto:sboyd@kernel.org]
> Sent: Thursday, April 19, 2018 11:18 AM
> To: Anson Huang <anson.huang@nxp.com>; Shawn Guo
> <shawnguo@kernel.org>
> Cc: mark.rutland@arm.com; devicetree@vger.kernel.org;
> mturquette@baylibre.com; linux-clk@vger.kernel.org; linux@armlinux.org.uk;
> linux-kernel@vger.kernel.org; robh+dt@kernel.org; dl-linux-imx
> <linux-imx@nxp.com>; kernel@pengutronix.de; Fabio Estevam
> <fabio.estevam@nxp.com>; S.j. Wang <shengjiu.wang@nxp.com>;
> linux-arm-kernel@lists.infradead.org
> Subject: Re: [PATCH V2 2/2] ARM: dts: imx6sx-sabreauto: add external 24MHz
> clock source
> 
> Quoting Shawn Guo (2018-04-17 07:22:05)
> > On Mon, Mar 19, 2018 at 10:30:45AM +0800, Anson Huang wrote:
> > > On i.MX6SX SabreAuto board, there is external 24MHz clock source for
> > > analog clock2, add this clock source to clock tree.
> > >
> > > Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
> > > ---
> > > changes since V1:
> > >       remove unnecessary clocks container.
> >
> > I understand this is suggested by Fabio, but I'm afraid that it's not
> > going to work with imx_obtain_fixed_clock() call, which is coded to
> > look for clocks under /clocks node.
> >
> 
> Should patch #1 be dropped from clk tree?

If so, I think we should use V1 patch to keep clocks container?
 
Anson.

Re: [PATCH V2 2/2] ARM: dts: imx6sx-sabreauto: add external 24MHz clock source

[Shawn Guo]

On Wed, Apr 18, 2018 at 08:17:35PM -0700, Stephen Boyd wrote:
> Quoting Shawn Guo (2018-04-17 07:22:05)
> > On Mon, Mar 19, 2018 at 10:30:45AM +0800, Anson Huang wrote:
> > > On i.MX6SX SabreAuto board, there is external 24MHz clock
> > > source for analog clock2, add this clock source to clock tree.
> > > 
> > > Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
> > > ---
> > > changes since V1:
> > >       remove unnecessary clocks container.
> > 
> > I understand this is suggested by Fabio, but I'm afraid that it's not
> > going to work with imx_obtain_fixed_clock() call, which is coded to
> > look for clocks under /clocks node.
> > 
> 
> Should patch #1 be dropped from clk tree?

No.  Patch #1 is good.

Shawn

Re: [PATCH V2 2/2] ARM: dts: imx6sx-sabreauto: add external 24MHz clock source

[Shawn Guo]

On Thu, Apr 19, 2018 at 03:23:39AM +0000, Anson Huang wrote:
> If so, I think we should use V1 patch to keep clocks container?

Ah, right.  I will just pick up v1 of patch #2.

Shawn

Re: [PATCH V2 2/2] ARM: dts: imx6sx-sabreauto: add external 24MHz clock source

[Shawn Guo]

On Thu, Apr 19, 2018 at 10:02:37PM +0800, Shawn Guo wrote:
> On Wed, Apr 18, 2018 at 08:17:35PM -0700, Stephen Boyd wrote:
> > Quoting Shawn Guo (2018-04-17 07:22:05)
> > > On Mon, Mar 19, 2018 at 10:30:45AM +0800, Anson Huang wrote:
> > > > On i.MX6SX SabreAuto board, there is external 24MHz clock
> > > > source for analog clock2, add this clock source to clock tree.
> > > > 
> > > > Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
> > > > ---
> > > > changes since V1:
> > > >       remove unnecessary clocks container.
> > > 
> > > I understand this is suggested by Fabio, but I'm afraid that it's not
> > > going to work with imx_obtain_fixed_clock() call, which is coded to
> > > look for clocks under /clocks node.
> > > 
> > 
> > Should patch #1 be dropped from clk tree?
> 
> No.  Patch #1 is good.

Sorry, Stephen.  I just had a closer look at the driver code, and I
think it can be done in a better way.  So please drop patch #1 for now.

Shawn

Re: [PATCH V2 1/2] clk: imx6sx: add missing lvds2 clock to the clock tree

[Shawn Guo]

On Mon, Mar 19, 2018 at 10:30:44AM +0800, Anson Huang wrote:
> i.MX6SX has lvds2 (analog clock2), an I/O clock like lvds1.
> And this lvds2, along with lvds1, can be used to provide
> external clock source to the internal pll, such as pll4_audio
> and pll5_video.
> 
> This patch mainly adds the lvds2 to the clock tree and fix its
> relationship with pll accordingly.
> 
> Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
> Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
> ---
>  drivers/clk/imx/clk-imx6sx.c             | 8 ++++++--
>  include/dt-bindings/clock/imx6sx-clock.h | 6 +++++-
>  2 files changed, 11 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/clk/imx/clk-imx6sx.c b/drivers/clk/imx/clk-imx6sx.c
> index e6d389e..478ad0d 100644
> --- a/drivers/clk/imx/clk-imx6sx.c
> +++ b/drivers/clk/imx/clk-imx6sx.c
> @@ -80,7 +80,7 @@ static const char *lvds_sels[]	= {
>  	"arm", "pll1_sys", "dummy", "dummy", "dummy", "dummy", "dummy", "pll5_video_div",
>  	"dummy", "dummy", "pcie_ref_125m", "dummy", "usbphy1", "usbphy2",
>  };
> -static const char *pll_bypass_src_sels[] = { "osc", "lvds1_in", };
> +static const char *pll_bypass_src_sels[] = { "osc", "lvds1_in", "lvds2_in", "dummy", };
>  static const char *pll1_bypass_sels[] = { "pll1", "pll1_bypass_src", };
>  static const char *pll2_bypass_sels[] = { "pll2", "pll2_bypass_src", };
>  static const char *pll3_bypass_sels[] = { "pll3", "pll3_bypass_src", };
> @@ -158,8 +158,9 @@ static void __init imx6sx_clocks_init(struct device_node *ccm_node)
>  	clks[IMX6SX_CLK_IPP_DI0] = of_clk_get_by_name(ccm_node, "ipp_di0");
>  	clks[IMX6SX_CLK_IPP_DI1] = of_clk_get_by_name(ccm_node, "ipp_di1");
>  
> -	/* Clock source from external clock via CLK1 PAD */
> +	/* Clock source from external clock via CLK1/2 PAD */
>  	clks[IMX6SX_CLK_ANACLK1] = imx_obtain_fixed_clock("anaclk1", 0);
> +	clks[IMX6SX_CLK_ANACLK2] = imx_obtain_fixed_clock("anaclk2", 0);

It seems to me that anaclk clocks are similar to ipp_di, and could be
handled in the same way as ipp_di clocks.  If that's the case, I would
suggest we do the following.

1. Kill clocks container node by dropping 'reg' property and naming
   clock nodes uniquely.  This is not strictly related to what we try
   to do here, but just to address DT maintainers' concern on 'clocks'
   container node.

	clk_ckil: clock-ckil {
		compatible = "fixed-clock";
		#clock-cells = <0>;
		clock-frequency = <32768>;
		clock-output-names = "ckil";
	};

	clk_osc: clock-osc {
		compatible = "fixed-clock";
		#clock-cells = <0>;
		clock-frequency = <24000000>;
		clock-output-names = "osc";
	};

	clk_ipp_di0: clock-ipp-di0 {
		compatible = "fixed-clock";
		#clock-cells = <0>;
		clock-frequency = <0>;
		clock-output-names = "ipp_di0";
	};

	clk_ipp_di1: clock-ipp-di1 {
		compatible = "fixed-clock";
		#clock-cells = <0>;
		clock-frequency = <0>;
		clock-output-names = "ipp_di1";
	};

	clks: ccm@20c4000 {
		compatible = "fsl,imx6sx-ccm";
		reg = <0x020c4000 0x4000>;
		interrupts = <GIC_SPI 87 IRQ_TYPE_LEVEL_HIGH>,
			     <GIC_SPI 88 IRQ_TYPE_LEVEL_HIGH>;
		#clock-cells = <1>;
		clocks = <&clk_ckil>, <&clk_osc>, <&clk_ipp_di0>, <&clk_ipp_di1>;
		clock-names = "ckil", "osc", "ipp_di0", "ipp_di1";
	};

2. Patch clock driver to have anaclk1 and anaclk2 handled in the same
   way as ipp_di clocks.

	clks[IMX6SX_CLK_ANACLK1] = of_clk_get_by_name(ccm_node, "anaclk1");
	clks[IMX6SX_CLK_ANACLK2] = of_clk_get_by_name(ccm_node, "anaclk2");

3. Add anaclk1 and anaclk2 with clock-frequency being 0 by default, just
   like ipp_di clocks.

	clk_anaclk1: clock-anaclk1 {
		compatible = "fixed-clock";
		#clock-cells = <0>;
		clock-frequency = <0>;
		clock-output-names = "anaclk1";
	};

	clk_anaclk2: clock-anaclk2 {
		compatible = "fixed-clock";
		#clock-cells = <0>;
		clock-frequency = <0>;
		clock-output-names = "anaclk2";
	};

	clks: ccm@20c4000 {
		compatible = "fsl,imx6sx-ccm";
		reg = <0x020c4000 0x4000>;
		interrupts = <GIC_SPI 87 IRQ_TYPE_LEVEL_HIGH>,
			     <GIC_SPI 88 IRQ_TYPE_LEVEL_HIGH>;
		#clock-cells = <1>;
		clocks = <&clk_ckil>, <&clk_osc>,
			 <&clk_ipp_di0>, <&clk_ipp_di1>,
			 <&clk_anaclk1>, <&clk_anaclk2>;
		clock-names = "ckil", "osc",
			      "ipp_di0", "ipp_di1",
			      "anaclk1", "anaclk2";
	};

4. Overwrite anaclk2 clock-frequency in imx6sx-sabreauto.dts.

&clk_anaclk2 {
	clock-frequency = <24576000>;
};

Please test and let me know whether it works or not.  Thanks.

Shawn

>  
>  	np = of_find_compatible_node(NULL, NULL, "fsl,imx6sx-anatop");
>  	base = of_iomap(np, 0);
> @@ -228,7 +229,9 @@ static void __init imx6sx_clocks_init(struct device_node *ccm_node)
>  	clks[IMX6SX_CLK_PCIE_REF_125M] = imx_clk_gate("pcie_ref_125m", "pcie_ref", base + 0xe0, 19);
>  
>  	clks[IMX6SX_CLK_LVDS1_OUT] = imx_clk_gate_exclusive("lvds1_out", "lvds1_sel", base + 0x160, 10, BIT(12));
> +	clks[IMX6SX_CLK_LVDS2_OUT] = imx_clk_gate_exclusive("lvds2_out", "lvds2_sel", base + 0x160, 11, BIT(13));
>  	clks[IMX6SX_CLK_LVDS1_IN]  = imx_clk_gate_exclusive("lvds1_in",  "anaclk1",   base + 0x160, 12, BIT(10));
> +	clks[IMX6SX_CLK_LVDS2_IN]  = imx_clk_gate_exclusive("lvds2_in",  "anaclk2",   base + 0x160, 13, BIT(11));
>  
>  	clks[IMX6SX_CLK_ENET_REF] = clk_register_divider_table(NULL, "enet_ref", "pll6_enet", 0,
>  			base + 0xe0, 0, 2, 0, clk_enet_ref_table,
> @@ -270,6 +273,7 @@ static void __init imx6sx_clocks_init(struct device_node *ccm_node)
>  
>  	/*                                                name                reg           shift   width   parent_names       num_parents */
>  	clks[IMX6SX_CLK_LVDS1_SEL]          = imx_clk_mux("lvds1_sel",        base + 0x160, 0,      5,      lvds_sels,         ARRAY_SIZE(lvds_sels));
> +	clks[IMX6SX_CLK_LVDS2_SEL]          = imx_clk_mux("lvds2_sel",        base + 0x160, 5,      5,      lvds_sels,         ARRAY_SIZE(lvds_sels));
>  
>  	np = ccm_node;
>  	base = of_iomap(np, 0);
> diff --git a/include/dt-bindings/clock/imx6sx-clock.h b/include/dt-bindings/clock/imx6sx-clock.h
> index 36f0324..cd2d6c5 100644
> --- a/include/dt-bindings/clock/imx6sx-clock.h
> +++ b/include/dt-bindings/clock/imx6sx-clock.h
> @@ -275,6 +275,10 @@
>  #define IMX6SX_PLL6_BYPASS		262
>  #define IMX6SX_PLL7_BYPASS		263
>  #define IMX6SX_CLK_SPDIF_GCLK		264
> -#define IMX6SX_CLK_CLK_END		265
> +#define IMX6SX_CLK_LVDS2_SEL		265
> +#define IMX6SX_CLK_LVDS2_OUT		266
> +#define IMX6SX_CLK_LVDS2_IN		267
> +#define IMX6SX_CLK_ANACLK2		268
> +#define IMX6SX_CLK_CLK_END		269
>  
>  #endif /* __DT_BINDINGS_CLOCK_IMX6SX_H */
> -- 
> 2.7.4
> 
> --
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Re: [PATCH V2 2/2] ARM: dts: imx6sx-sabreauto: add external 24MHz clock source

[Stephen Boyd]

Quoting Shawn Guo (2018-04-19 07:24:42)
> On Thu, Apr 19, 2018 at 10:02:37PM +0800, Shawn Guo wrote:
> > On Wed, Apr 18, 2018 at 08:17:35PM -0700, Stephen Boyd wrote:
> > > Quoting Shawn Guo (2018-04-17 07:22:05)
> > > > On Mon, Mar 19, 2018 at 10:30:45AM +0800, Anson Huang wrote:
> > > > > On i.MX6SX SabreAuto board, there is external 24MHz clock
> > > > > source for analog clock2, add this clock source to clock tree.
> > > > > 
> > > > > Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
> > > > > ---
> > > > > changes since V1:
> > > > >       remove unnecessary clocks container.
> > > > 
> > > > I understand this is suggested by Fabio, but I'm afraid that it's not
> > > > going to work with imx_obtain_fixed_clock() call, which is coded to
> > > > look for clocks under /clocks node.
> > > > 
> > > 
> > > Should patch #1 be dropped from clk tree?
> > 
> > No.  Patch #1 is good.
> 
> Sorry, Stephen.  I just had a closer look at the driver code, and I
> think it can be done in a better way.  So please drop patch #1 for now.
> 

Ok.

RE: [PATCH V2 1/2] clk: imx6sx: add missing lvds2 clock to the clock tree

[Anson Huang]

Anson Huang
Best Regards!


> -----Original Message-----
> From: Shawn Guo [mailto:shawnguo@kernel.org]
> Sent: Thursday, April 19, 2018 10:57 PM
> To: Anson Huang <anson.huang@nxp.com>
> Cc: kernel@pengutronix.de; Fabio Estevam <fabio.estevam@nxp.com>;
> robh+dt@kernel.org; mark.rutland@arm.com; linux@armlinux.org.uk;
> mturquette@baylibre.com; sboyd@kernel.org; S.j. Wang
> <shengjiu.wang@nxp.com>; dl-linux-imx <linux-imx@nxp.com>;
> linux-arm-kernel@lists.infradead.org; devicetree@vger.kernel.org;
> linux-kernel@vger.kernel.org; linux-clk@vger.kernel.org
> Subject: Re: [PATCH V2 1/2] clk: imx6sx: add missing lvds2 clock to the clock tree
> 
> On Mon, Mar 19, 2018 at 10:30:44AM +0800, Anson Huang wrote:
> > i.MX6SX has lvds2 (analog clock2), an I/O clock like lvds1.
> > And this lvds2, along with lvds1, can be used to provide external
> > clock source to the internal pll, such as pll4_audio and pll5_video.
> >
> > This patch mainly adds the lvds2 to the clock tree and fix its
> > relationship with pll accordingly.
> >
> > Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
> > Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
> > ---
> >  drivers/clk/imx/clk-imx6sx.c             | 8 ++++++--
> >  include/dt-bindings/clock/imx6sx-clock.h | 6 +++++-
> >  2 files changed, 11 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/clk/imx/clk-imx6sx.c
> > b/drivers/clk/imx/clk-imx6sx.c index e6d389e..478ad0d 100644
> > --- a/drivers/clk/imx/clk-imx6sx.c
> > +++ b/drivers/clk/imx/clk-imx6sx.c
> > @@ -80,7 +80,7 @@ static const char *lvds_sels[]	= {
> >  	"arm", "pll1_sys", "dummy", "dummy", "dummy", "dummy", "dummy",
> "pll5_video_div",
> >  	"dummy", "dummy", "pcie_ref_125m", "dummy", "usbphy1", "usbphy2",
> > }; -static const char *pll_bypass_src_sels[] = { "osc", "lvds1_in", };
> > +static const char *pll_bypass_src_sels[] = { "osc", "lvds1_in",
> > +"lvds2_in", "dummy", };
> >  static const char *pll1_bypass_sels[] = { "pll1", "pll1_bypass_src",
> > };  static const char *pll2_bypass_sels[] = { "pll2",
> > "pll2_bypass_src", };  static const char *pll3_bypass_sels[] = {
> > "pll3", "pll3_bypass_src", }; @@ -158,8 +158,9 @@ static void __init
> imx6sx_clocks_init(struct device_node *ccm_node)
> >  	clks[IMX6SX_CLK_IPP_DI0] = of_clk_get_by_name(ccm_node, "ipp_di0");
> >  	clks[IMX6SX_CLK_IPP_DI1] = of_clk_get_by_name(ccm_node, "ipp_di1");
> >
> > -	/* Clock source from external clock via CLK1 PAD */
> > +	/* Clock source from external clock via CLK1/2 PAD */
> >  	clks[IMX6SX_CLK_ANACLK1] = imx_obtain_fixed_clock("anaclk1", 0);
> > +	clks[IMX6SX_CLK_ANACLK2] = imx_obtain_fixed_clock("anaclk2", 0);
> 
> It seems to me that anaclk clocks are similar to ipp_di, and could be handled in
> the same way as ipp_di clocks.  If that's the case, I would suggest we do the
> following.
> 
> 1. Kill clocks container node by dropping 'reg' property and naming
>    clock nodes uniquely.  This is not strictly related to what we try
>    to do here, but just to address DT maintainers' concern on 'clocks'
>    container node.
> 
> 	clk_ckil: clock-ckil {
> 		compatible = "fixed-clock";
> 		#clock-cells = <0>;
> 		clock-frequency = <32768>;
> 		clock-output-names = "ckil";
> 	};
> 
> 	clk_osc: clock-osc {
> 		compatible = "fixed-clock";
> 		#clock-cells = <0>;
> 		clock-frequency = <24000000>;
> 		clock-output-names = "osc";
> 	};
> 
> 	clk_ipp_di0: clock-ipp-di0 {
> 		compatible = "fixed-clock";
> 		#clock-cells = <0>;
> 		clock-frequency = <0>;
> 		clock-output-names = "ipp_di0";
> 	};
> 
> 	clk_ipp_di1: clock-ipp-di1 {
> 		compatible = "fixed-clock";
> 		#clock-cells = <0>;
> 		clock-frequency = <0>;
> 		clock-output-names = "ipp_di1";
> 	};
> 
> 	clks: ccm@20c4000 {
> 		compatible = "fsl,imx6sx-ccm";
> 		reg = <0x020c4000 0x4000>;
> 		interrupts = <GIC_SPI 87 IRQ_TYPE_LEVEL_HIGH>,
> 			     <GIC_SPI 88 IRQ_TYPE_LEVEL_HIGH>;
> 		#clock-cells = <1>;
> 		clocks = <&clk_ckil>, <&clk_osc>, <&clk_ipp_di0>, <&clk_ipp_di1>;
> 		clock-names = "ckil", "osc", "ipp_di0", "ipp_di1";
> 	};
> 
> 2. Patch clock driver to have anaclk1 and anaclk2 handled in the same
>    way as ipp_di clocks.
> 
> 	clks[IMX6SX_CLK_ANACLK1] = of_clk_get_by_name(ccm_node, "anaclk1");
> 	clks[IMX6SX_CLK_ANACLK2] = of_clk_get_by_name(ccm_node, "anaclk2");
> 
> 3. Add anaclk1 and anaclk2 with clock-frequency being 0 by default, just
>    like ipp_di clocks.
> 
> 	clk_anaclk1: clock-anaclk1 {
> 		compatible = "fixed-clock";
> 		#clock-cells = <0>;
> 		clock-frequency = <0>;
> 		clock-output-names = "anaclk1";
> 	};
> 
> 	clk_anaclk2: clock-anaclk2 {
> 		compatible = "fixed-clock";
> 		#clock-cells = <0>;
> 		clock-frequency = <0>;
> 		clock-output-names = "anaclk2";
> 	};
> 
> 	clks: ccm@20c4000 {
> 		compatible = "fsl,imx6sx-ccm";
> 		reg = <0x020c4000 0x4000>;
> 		interrupts = <GIC_SPI 87 IRQ_TYPE_LEVEL_HIGH>,
> 			     <GIC_SPI 88 IRQ_TYPE_LEVEL_HIGH>;
> 		#clock-cells = <1>;
> 		clocks = <&clk_ckil>, <&clk_osc>,
> 			 <&clk_ipp_di0>, <&clk_ipp_di1>,
> 			 <&clk_anaclk1>, <&clk_anaclk2>;
> 		clock-names = "ckil", "osc",
> 			      "ipp_di0", "ipp_di1",
> 			      "anaclk1", "anaclk2";
> 	};
> 
> 4. Overwrite anaclk2 clock-frequency in imx6sx-sabreauto.dts.
> 
> &clk_anaclk2 {
> 	clock-frequency = <24576000>;
> };
> 
> Please test and let me know whether it works or not.  Thanks.
> 
> Shawn

It is working, see below clk tree dump, I will send a V3 patch, thanks.

Anson. 


root@imx6qpdlsolox:~# cat /sys/kernel/debug/clk/clk_summary
                                 enable  prepare  protect
   clock                          count    count    count        rate   accuracy   phase
----------------------------------------------------------------------------------------
 dummy                                3        3        0           0          0 0
    cko1_sel                          0        0        0           0          0 0
       cko1_podf                      0        0        0           0          0 0
          cko1                        0        0        0           0          0 0
             cko                      0        0        0           0          0 0
    usbphy2_gate                      1        1        0           0          0 0
    usbphy1_gate                      1        1        0           0          0 0
 anaclk2                              0        0        0    24576000          0 0
    lvds2_in                          0        0        0    24576000          0 0
 anaclk1                              0        0        0           0          0 0
    lvds1_in                          0        0        0           0          0 0
 ipp_di1                              0        0        0           0          0 0
 ipp_di0                              0        0        0           0          0 0
 osc                                  6        6        0    24000000          0 0

> 
> >
> >  	np = of_find_compatible_node(NULL, NULL, "fsl,imx6sx-anatop");
> >  	base = of_iomap(np, 0);
> > @@ -228,7 +229,9 @@ static void __init imx6sx_clocks_init(struct
> device_node *ccm_node)
> >  	clks[IMX6SX_CLK_PCIE_REF_125M] = imx_clk_gate("pcie_ref_125m",
> > "pcie_ref", base + 0xe0, 19);
> >
> >  	clks[IMX6SX_CLK_LVDS1_OUT] = imx_clk_gate_exclusive("lvds1_out",
> > "lvds1_sel", base + 0x160, 10, BIT(12));
> > +	clks[IMX6SX_CLK_LVDS2_OUT] = imx_clk_gate_exclusive("lvds2_out",
> > +"lvds2_sel", base + 0x160, 11, BIT(13));
> >  	clks[IMX6SX_CLK_LVDS1_IN]  = imx_clk_gate_exclusive("lvds1_in",
> "anaclk1",   base + 0x160, 12, BIT(10));
> > +	clks[IMX6SX_CLK_LVDS2_IN]  = imx_clk_gate_exclusive("lvds2_in",
> "anaclk2",   base + 0x160, 13, BIT(11));
> >
> >  	clks[IMX6SX_CLK_ENET_REF] = clk_register_divider_table(NULL,
> "enet_ref", "pll6_enet", 0,
> >  			base + 0xe0, 0, 2, 0, clk_enet_ref_table, @@ -270,6 +273,7 @@
> > static void __init imx6sx_clocks_init(struct device_node *ccm_node)
> >
> >  	/*                                                name
> reg           shift   width   parent_names       num_parents */
> >  	clks[IMX6SX_CLK_LVDS1_SEL]          = imx_clk_mux("lvds1_sel",
> base + 0x160, 0,      5,      lvds_sels,         ARRAY_SIZE(lvds_sels));
> > +	clks[IMX6SX_CLK_LVDS2_SEL]          = imx_clk_mux("lvds2_sel",
> base + 0x160, 5,      5,      lvds_sels,         ARRAY_SIZE(lvds_sels));
> >
> >  	np = ccm_node;
> >  	base = of_iomap(np, 0);
> > diff --git a/include/dt-bindings/clock/imx6sx-clock.h
> > b/include/dt-bindings/clock/imx6sx-clock.h
> > index 36f0324..cd2d6c5 100644
> > --- a/include/dt-bindings/clock/imx6sx-clock.h
> > +++ b/include/dt-bindings/clock/imx6sx-clock.h
> > @@ -275,6 +275,10 @@
> >  #define IMX6SX_PLL6_BYPASS		262
> >  #define IMX6SX_PLL7_BYPASS		263
> >  #define IMX6SX_CLK_SPDIF_GCLK		264
> > -#define IMX6SX_CLK_CLK_END		265
> > +#define IMX6SX_CLK_LVDS2_SEL		265
> > +#define IMX6SX_CLK_LVDS2_OUT		266
> > +#define IMX6SX_CLK_LVDS2_IN		267
> > +#define IMX6SX_CLK_ANACLK2		268
> > +#define IMX6SX_CLK_CLK_END		269
> >
> >  #endif /* __DT_BINDINGS_CLOCK_IMX6SX_H */
> > --
> > 2.7.4
> >
> > --
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