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Message-ID: <20151019152807.20687.15779@quantum>
Date: Mon, 19 Oct 2015 08:28:07 -0700
From: Michael Turquette <mturquette@...libre.com>
To: Shengjiu Wang <shengjiu.wang@...escale.com>, shawnguo@...nel.org,
kernel@...gutronix.de, robh+dt@...nel.org, pawel.moll@....com,
mark.rutland@....com, ijc+devicetree@...lion.org.uk,
galak@...eaurora.org, linux@....linux.org.uk
Cc: linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3 1/2] clk: imx6: Add SPDIF_GCLK clock in clock tree
Quoting Shengjiu Wang (2015-10-10 03:15:06)
> Correct SPDIF clock setting issue in clock tree, the SPDIF_GCLK is also
> one clock of SPDIF, which is missed before.
>
> We found an issue that imx can't enter low power mode with spdif
> if IMX6x_CLK_SPDIF is used as the core clock of spdif. Because
> spdif driver will register IMX6x_CLK_SPDIF clock to regmap, regmap will do
> clk_prepare in init function, then IMX6x_CLK_SPDIF clock is prepared in probe,
> so its parent clock (PLL clock) is prepared, the prepare operation of
> PLL clock is to enable the clock. But I.MX needs all PLL clock is disabled,
> then it can enter low power mode.
>
> So we can't use IMX6x_CLK_SPDIF as the core clock of spdif, the correct spdif
> core clock is SPDIF_GCLK, which share same gate bit with IMX6x_CLK_SPDIF clock.
> SPDIF_GCLK's parent clock is ipg clock.
I'm confused by this. Is there really a new clock signal to be added, or
this just to workaround some reference counting problems with regmap?
>
> Signed-off-by: Shengjiu Wang <shengjiu.wang@...escale.com>
Please Cc the linux-clk@...r.kernel.org mailing list for future clock
driver patches.
Regards,
Mike
> ---
> drivers/clk/imx/clk-imx6q.c | 4 +++-
> drivers/clk/imx/clk-imx6sl.c | 4 +++-
> drivers/clk/imx/clk-imx6sx.c | 1 +
> include/dt-bindings/clock/imx6qdl-clock.h | 3 ++-
> include/dt-bindings/clock/imx6sl-clock.h | 3 ++-
> include/dt-bindings/clock/imx6sx-clock.h | 3 ++-
> 6 files changed, 13 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/clk/imx/clk-imx6q.c b/drivers/clk/imx/clk-imx6q.c
> index e9ba018..c193508 100644
> --- a/drivers/clk/imx/clk-imx6q.c
> +++ b/drivers/clk/imx/clk-imx6q.c
> @@ -119,6 +119,7 @@ static unsigned int share_count_ssi1;
> static unsigned int share_count_ssi2;
> static unsigned int share_count_ssi3;
> static unsigned int share_count_mipi_core_cfg;
> +static unsigned int share_count_spdif;
>
> static inline int clk_on_imx6q(void)
> {
> @@ -462,7 +463,8 @@ static void __init imx6q_clocks_init(struct device_node *ccm_node)
> clk[IMX6QDL_CLK_SATA] = imx_clk_gate2("sata", "ahb", base + 0x7c, 4);
> clk[IMX6QDL_CLK_SDMA] = imx_clk_gate2("sdma", "ahb", base + 0x7c, 6);
> clk[IMX6QDL_CLK_SPBA] = imx_clk_gate2("spba", "ipg", base + 0x7c, 12);
> - clk[IMX6QDL_CLK_SPDIF] = imx_clk_gate2("spdif", "spdif_podf", base + 0x7c, 14);
> + clk[IMX6QDL_CLK_SPDIF] = imx_clk_gate2_shared("spdif", "spdif_podf", base + 0x7c, 14, &share_count_spdif);
> + clk[IMX6QDL_CLK_SPDIF_GCLK] = imx_clk_gate2_shared("spdif_gclk", "ipg", base + 0x7c, 14, &share_count_spdif);
> clk[IMX6QDL_CLK_SSI1_IPG] = imx_clk_gate2_shared("ssi1_ipg", "ipg", base + 0x7c, 18, &share_count_ssi1);
> clk[IMX6QDL_CLK_SSI2_IPG] = imx_clk_gate2_shared("ssi2_ipg", "ipg", base + 0x7c, 20, &share_count_ssi2);
> clk[IMX6QDL_CLK_SSI3_IPG] = imx_clk_gate2_shared("ssi3_ipg", "ipg", base + 0x7c, 22, &share_count_ssi3);
> diff --git a/drivers/clk/imx/clk-imx6sl.c b/drivers/clk/imx/clk-imx6sl.c
> index 3c3333f..1be6230 100644
> --- a/drivers/clk/imx/clk-imx6sl.c
> +++ b/drivers/clk/imx/clk-imx6sl.c
> @@ -97,6 +97,7 @@ static struct clk_div_table video_div_table[] = {
> static unsigned int share_count_ssi1;
> static unsigned int share_count_ssi2;
> static unsigned int share_count_ssi3;
> +static unsigned int share_count_spdif;
>
> static struct clk *clks[IMX6SL_CLK_END];
> static struct clk_onecell_data clk_data;
> @@ -397,7 +398,8 @@ static void __init imx6sl_clocks_init(struct device_node *ccm_node)
> clks[IMX6SL_CLK_PWM4] = imx_clk_gate2("pwm4", "perclk", base + 0x78, 22);
> clks[IMX6SL_CLK_SDMA] = imx_clk_gate2("sdma", "ipg", base + 0x7c, 6);
> clks[IMX6SL_CLK_SPBA] = imx_clk_gate2("spba", "ipg", base + 0x7c, 12);
> - clks[IMX6SL_CLK_SPDIF] = imx_clk_gate2("spdif", "spdif0_podf", base + 0x7c, 14);
> + clks[IMX6SL_CLK_SPDIF] = imx_clk_gate2_shared("spdif", "spdif0_podf", base + 0x7c, 14, &share_count_spdif);
> + clks[IMX6SL_CLK_SPDIF_GCLK] = imx_clk_gate2_shared("spdif_gclk", "ipg", base + 0x7c, 14, &share_count_spdif);
> clks[IMX6SL_CLK_SSI1_IPG] = imx_clk_gate2_shared("ssi1_ipg", "ipg", base + 0x7c, 18, &share_count_ssi1);
> clks[IMX6SL_CLK_SSI2_IPG] = imx_clk_gate2_shared("ssi2_ipg", "ipg", base + 0x7c, 20, &share_count_ssi2);
> clks[IMX6SL_CLK_SSI3_IPG] = imx_clk_gate2_shared("ssi3_ipg", "ipg", base + 0x7c, 22, &share_count_ssi3);
> diff --git a/drivers/clk/imx/clk-imx6sx.c b/drivers/clk/imx/clk-imx6sx.c
> index f0ad8bb..fea125e 100644
> --- a/drivers/clk/imx/clk-imx6sx.c
> +++ b/drivers/clk/imx/clk-imx6sx.c
> @@ -460,6 +460,7 @@ static void __init imx6sx_clocks_init(struct device_node *ccm_node)
> clks[IMX6SX_CLK_SPBA] = imx_clk_gate2("spba", "ipg", base + 0x7c, 12);
> clks[IMX6SX_CLK_AUDIO] = imx_clk_gate2_shared("audio", "audio_podf", base + 0x7c, 14, &share_count_audio);
> clks[IMX6SX_CLK_SPDIF] = imx_clk_gate2_shared("spdif", "spdif_podf", base + 0x7c, 14, &share_count_audio);
> + clks[IMX6SX_CLK_SPDIF_GCLK] = imx_clk_gate2_shared("spdif_gclk", "ipg", base + 0x7c, 14, &share_count_audio);
> clks[IMX6SX_CLK_SSI1_IPG] = imx_clk_gate2_shared("ssi1_ipg", "ipg", base + 0x7c, 18, &share_count_ssi1);
> clks[IMX6SX_CLK_SSI2_IPG] = imx_clk_gate2_shared("ssi2_ipg", "ipg", base + 0x7c, 20, &share_count_ssi2);
> clks[IMX6SX_CLK_SSI3_IPG] = imx_clk_gate2_shared("ssi3_ipg", "ipg", base + 0x7c, 22, &share_count_ssi3);
> diff --git a/include/dt-bindings/clock/imx6qdl-clock.h b/include/dt-bindings/clock/imx6qdl-clock.h
> index 8de173f..77985cc 100644
> --- a/include/dt-bindings/clock/imx6qdl-clock.h
> +++ b/include/dt-bindings/clock/imx6qdl-clock.h
> @@ -254,6 +254,7 @@
> #define IMX6QDL_CLK_CAAM_MEM 241
> #define IMX6QDL_CLK_CAAM_ACLK 242
> #define IMX6QDL_CLK_CAAM_IPG 243
> -#define IMX6QDL_CLK_END 244
> +#define IMX6QDL_CLK_SPDIF_GCLK 244
> +#define IMX6QDL_CLK_END 245
>
> #endif /* __DT_BINDINGS_CLOCK_IMX6QDL_H */
> diff --git a/include/dt-bindings/clock/imx6sl-clock.h b/include/dt-bindings/clock/imx6sl-clock.h
> index 9ce4e42..e14573e 100644
> --- a/include/dt-bindings/clock/imx6sl-clock.h
> +++ b/include/dt-bindings/clock/imx6sl-clock.h
> @@ -174,6 +174,7 @@
> #define IMX6SL_CLK_SSI1_IPG 161
> #define IMX6SL_CLK_SSI2_IPG 162
> #define IMX6SL_CLK_SSI3_IPG 163
> -#define IMX6SL_CLK_END 164
> +#define IMX6SL_CLK_SPDIF_GCLK 164
> +#define IMX6SL_CLK_END 165
>
> #endif /* __DT_BINDINGS_CLOCK_IMX6SL_H */
> diff --git a/include/dt-bindings/clock/imx6sx-clock.h b/include/dt-bindings/clock/imx6sx-clock.h
> index 9957091..36f0324 100644
> --- a/include/dt-bindings/clock/imx6sx-clock.h
> +++ b/include/dt-bindings/clock/imx6sx-clock.h
> @@ -274,6 +274,7 @@
> #define IMX6SX_PLL5_BYPASS 261
> #define IMX6SX_PLL6_BYPASS 262
> #define IMX6SX_PLL7_BYPASS 263
> -#define IMX6SX_CLK_CLK_END 264
> +#define IMX6SX_CLK_SPDIF_GCLK 264
> +#define IMX6SX_CLK_CLK_END 265
>
> #endif /* __DT_BINDINGS_CLOCK_IMX6SX_H */
> --
> 1.9.1
>
--
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