| Message ID | 1550828264-9962-1-git-send-email-Anson.Huang@nxp.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [1/3] clk: imx8mq: initialize clock tree earlier | expand |
Hi Anson, > From: Anson Huang > Sent: Friday, February 22, 2019 5:42 PM > > Currently on i.MX8MQ platform, clock driver is probed later than GPIO driver, > and GPIO driver does NOT have defer probe mechanism since the GPIO clock is > optional, some platforms have GPIO clocks and some are NOT. So it is an issue > that on i.MX8MQ platform, there are GPIO clocks defined, but due to clock > tree is NOT ready during GPIO driver probe, the GPIO clock management will > fail and cause system hang if GPIO clocks are OFF by default. > > This patch changes the i.MX8MQ clock tree initialization using > CLK_OF_DECLARE instead of platform driver model to make clock tree ready > earlier than GPIO driver. Please double check why GPIO driver can't handle PROBE_DEFER well. Maintainers suggested us to use platform driver unless there is strong reason. Regards Dong Aisheng > > Signed-off-by: Anson Huang <Anson.Huang@nxp.com> > --- > drivers/clk/imx/clk-imx8mq.c | 33 +++++++-------------------------- > 1 file changed, 7 insertions(+), 26 deletions(-) > > diff --git a/drivers/clk/imx/clk-imx8mq.c b/drivers/clk/imx/clk-imx8mq.c index > 26b57f4..2df1575 100644 > --- a/drivers/clk/imx/clk-imx8mq.c > +++ b/drivers/clk/imx/clk-imx8mq.c > @@ -269,10 +269,9 @@ static const char *imx8mq_clko2_sels[] = {"osc_25m", > "sys2_pll_200m", "sys1_pll_ > > static struct clk_onecell_data clk_data; > > -static int imx8mq_clocks_probe(struct platform_device *pdev) > +static void __init imx8mq_clocks_init(struct device_node *np) > { > - struct device *dev = &pdev->dev; > - struct device_node *np = dev->of_node; > + struct device_node *anatop_np; > void __iomem *base; > int err; > int i; > @@ -286,10 +285,10 @@ static int imx8mq_clocks_probe(struct > platform_device *pdev) > clks[IMX8MQ_CLK_EXT3] = of_clk_get_by_name(np, "clk_ext3"); > clks[IMX8MQ_CLK_EXT4] = of_clk_get_by_name(np, "clk_ext4"); > > - np = of_find_compatible_node(NULL, NULL, "fsl,imx8mq-anatop"); > - base = of_iomap(np, 0); > + anatop_np = of_find_compatible_node(NULL, NULL, > "fsl,imx8mq-anatop"); > + base = of_iomap(anatop_np, 0); > if (WARN_ON(!base)) > - return -ENOMEM; > + return; > > clks[IMX8MQ_ARM_PLL_REF_SEL] = imx_clk_mux("arm_pll_ref_sel", base > + 0x28, 16, 2, pll_ref_sels, ARRAY_SIZE(pll_ref_sels)); > clks[IMX8MQ_GPU_PLL_REF_SEL] = imx_clk_mux("gpu_pll_ref_sel", base > + 0x18, 16, 2, pll_ref_sels, ARRAY_SIZE(pll_ref_sels)); @@ -389,10 +388,9 @@ > static int imx8mq_clocks_probe(struct platform_device *pdev) > clks[IMX8MQ_SYS2_PLL_500M] = imx_clk_fixed_factor("sys2_pll_500m", > "sys2_pll_out", 1, 2); > clks[IMX8MQ_SYS2_PLL_1000M] = > imx_clk_fixed_factor("sys2_pll_1000m", "sys2_pll_out", 1, 1); > > - np = dev->of_node; > base = of_iomap(np, 0); > if (WARN_ON(!base)) > - return -ENOMEM; > + return; > > /* CORE */ > clks[IMX8MQ_CLK_A53_SRC] = imx_clk_mux2("arm_a53_src", base + > 0x8000, 24, 3, imx8mq_a53_sels, ARRAY_SIZE(imx8mq_a53_sels)); @@ > -568,22 +566,5 @@ static int imx8mq_clocks_probe(struct platform_device > *pdev) > > err = of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data); > WARN_ON(err); > - > - return err; > } > - > -static const struct of_device_id imx8mq_clk_of_match[] = { > - { .compatible = "fsl,imx8mq-ccm" }, > - { /* Sentinel */ }, > -}; > -MODULE_DEVICE_TABLE(of, imx8mq_clk_of_match); > - > - > -static struct platform_driver imx8mq_clk_driver = { > - .probe = imx8mq_clocks_probe, > - .driver = { > - .name = "imx8mq-ccm", > - .of_match_table = of_match_ptr(imx8mq_clk_of_match), > - }, > -}; > -module_platform_driver(imx8mq_clk_driver); > +CLK_OF_DECLARE(imx8mq, "fsl,imx8mq-ccm", imx8mq_clocks_init); > -- > 2.7.4
Am Freitag, den 22.02.2019, 09:42 +0000 schrieb Anson Huang: > Currently on i.MX8MQ platform, clock driver is probed > later than GPIO driver, and GPIO driver does NOT have > defer probe mechanism since the GPIO clock is optional, So this is what should be fixed. If there is a clock reference in the DT, having the clock driver ready is not optional. Optional to the GPIO driver just means it won't fail if there is no clock reference at all. If there is and the clock provider is not yet there, it needs to do a PROBE_DEFER. So that's a NACK on this patch. Regards, Lucas > some platforms have GPIO clocks and some are NOT. So > it is an issue that on i.MX8MQ platform, there are GPIO > clocks defined, but due to clock tree is NOT ready during > GPIO driver probe, the GPIO clock management will fail > and cause system hang if GPIO clocks are OFF by default. > > This patch changes the i.MX8MQ clock tree initialization > using CLK_OF_DECLARE instead of platform driver model to > make clock tree ready earlier than GPIO driver. > > Signed-off-by: Anson Huang <Anson.Huang@nxp.com> > --- > drivers/clk/imx/clk-imx8mq.c | 33 +++++++-------------------------- > 1 file changed, 7 insertions(+), 26 deletions(-) > > diff --git a/drivers/clk/imx/clk-imx8mq.c b/drivers/clk/imx/clk- > imx8mq.c > index 26b57f4..2df1575 100644 > --- a/drivers/clk/imx/clk-imx8mq.c > +++ b/drivers/clk/imx/clk-imx8mq.c > @@ -269,10 +269,9 @@ static const char *imx8mq_clko2_sels[] = > {"osc_25m", "sys2_pll_200m", "sys1_pll_ > > static struct clk_onecell_data clk_data; > > -static int imx8mq_clocks_probe(struct platform_device *pdev) > +static void __init imx8mq_clocks_init(struct device_node *np) > { > - struct device *dev = &pdev->dev; > - struct device_node *np = dev->of_node; > + struct device_node *anatop_np; > void __iomem *base; > int err; > int i; > @@ -286,10 +285,10 @@ static int imx8mq_clocks_probe(struct > platform_device *pdev) > clks[IMX8MQ_CLK_EXT3] = of_clk_get_by_name(np, "clk_ext3"); > clks[IMX8MQ_CLK_EXT4] = of_clk_get_by_name(np, "clk_ext4"); > > - np = of_find_compatible_node(NULL, NULL, "fsl,imx8mq-anatop"); > - base = of_iomap(np, 0); > + anatop_np = of_find_compatible_node(NULL, NULL, "fsl,imx8mq- > anatop"); > + base = of_iomap(anatop_np, 0); > if (WARN_ON(!base)) > - return -ENOMEM; > + return; > > clks[IMX8MQ_ARM_PLL_REF_SEL] = imx_clk_mux("arm_pll_ref_sel", > base + 0x28, 16, 2, pll_ref_sels, ARRAY_SIZE(pll_ref_sels)); > clks[IMX8MQ_GPU_PLL_REF_SEL] = imx_clk_mux("gpu_pll_ref_sel", > base + 0x18, 16, 2, pll_ref_sels, ARRAY_SIZE(pll_ref_sels)); > @@ -389,10 +388,9 @@ static int imx8mq_clocks_probe(struct > platform_device *pdev) > clks[IMX8MQ_SYS2_PLL_500M] = > imx_clk_fixed_factor("sys2_pll_500m", "sys2_pll_out", 1, 2); > clks[IMX8MQ_SYS2_PLL_1000M] = > imx_clk_fixed_factor("sys2_pll_1000m", "sys2_pll_out", 1, 1); > > - np = dev->of_node; > base = of_iomap(np, 0); > if (WARN_ON(!base)) > - return -ENOMEM; > + return; > > /* CORE */ > clks[IMX8MQ_CLK_A53_SRC] = imx_clk_mux2("arm_a53_src", base + > 0x8000, 24, 3, imx8mq_a53_sels, ARRAY_SIZE(imx8mq_a53_sels)); > @@ -568,22 +566,5 @@ static int imx8mq_clocks_probe(struct > platform_device *pdev) > > err = of_clk_add_provider(np, of_clk_src_onecell_get, > &clk_data); > WARN_ON(err); > - > - return err; > } > - > -static const struct of_device_id imx8mq_clk_of_match[] = { > - { .compatible = "fsl,imx8mq-ccm" }, > - { /* Sentinel */ }, > -}; > -MODULE_DEVICE_TABLE(of, imx8mq_clk_of_match); > - > - > -static struct platform_driver imx8mq_clk_driver = { > - .probe = imx8mq_clocks_probe, > - .driver = { > - .name = "imx8mq-ccm", > - .of_match_table = of_match_ptr(imx8mq_clk_of_match), > - }, > -}; > -module_platform_driver(imx8mq_clk_driver); > +CLK_OF_DECLARE(imx8mq, "fsl,imx8mq-ccm", imx8mq_clocks_init);
Hi, Lucas Best Regards! Anson Huang > -----Original Message----- > From: Lucas Stach [mailto:l.stach@pengutronix.de] > Sent: 2019年2月22日 18:55 > To: Anson Huang <anson.huang@nxp.com>; robh+dt@kernel.org; > mark.rutland@arm.com; shawnguo@kernel.org; s.hauer@pengutronix.de; > kernel@pengutronix.de; festevam@gmail.com; mturquette@baylibre.com; > sboyd@kernel.org; Abel Vesa <abel.vesa@nxp.com>; ccaione@baylibre.com; > agx@sigxcpu.org; devicetree@vger.kernel.org; linux-arm- > kernel@lists.infradead.org; linux-kernel@vger.kernel.org; linux- > clk@vger.kernel.org > Cc: dl-linux-imx <linux-imx@nxp.com> > Subject: Re: [PATCH 1/3] clk: imx8mq: initialize clock tree earlier > > Am Freitag, den 22.02.2019, 09:42 +0000 schrieb Anson Huang: > > Currently on i.MX8MQ platform, clock driver is probed later than GPIO > > driver, and GPIO driver does NOT have defer probe mechanism since the > > GPIO clock is optional, > > So this is what should be fixed. If there is a clock reference in the DT, having > the clock driver ready is not optional. Optional to the GPIO driver just means > it won't fail if there is no clock reference at all. > If there is and the clock provider is not yet there, it needs to do a > PROBE_DEFER. > > So that's a NACK on this patch. OK, I see. Then I will do a patch for GPIO driver, and I just check other drivers, looks like imx2 watchdog driver also has similar issue, I will do a patch too. Thanks, Anson. > > Regards, > Lucas > > > some platforms have GPIO clocks and some are NOT. So it is an issue > > that on i.MX8MQ platform, there are GPIO clocks defined, but due to > > clock tree is NOT ready during GPIO driver probe, the GPIO clock > > management will fail and cause system hang if GPIO clocks are OFF by > > default. > > > > This patch changes the i.MX8MQ clock tree initialization using > > CLK_OF_DECLARE instead of platform driver model to make clock tree > > ready earlier than GPIO driver. > > > > Signed-off-by: Anson Huang <Anson.Huang@nxp.com> > > --- > > drivers/clk/imx/clk-imx8mq.c | 33 +++++++-------------------------- > > 1 file changed, 7 insertions(+), 26 deletions(-) > > > > diff --git a/drivers/clk/imx/clk-imx8mq.c b/drivers/clk/imx/clk- > > imx8mq.c index 26b57f4..2df1575 100644 > > --- a/drivers/clk/imx/clk-imx8mq.c > > +++ b/drivers/clk/imx/clk-imx8mq.c > > @@ -269,10 +269,9 @@ static const char *imx8mq_clko2_sels[] = > > {"osc_25m", "sys2_pll_200m", "sys1_pll_ > > > > static struct clk_onecell_data clk_data; > > > > -static int imx8mq_clocks_probe(struct platform_device *pdev) > > +static void __init imx8mq_clocks_init(struct device_node *np) > > { > > - struct device *dev = &pdev->dev; > > - struct device_node *np = dev->of_node; > > + struct device_node *anatop_np; > > void __iomem *base; > > int err; > > int i; > > @@ -286,10 +285,10 @@ static int imx8mq_clocks_probe(struct > > platform_device *pdev) > > clks[IMX8MQ_CLK_EXT3] = of_clk_get_by_name(np, "clk_ext3"); > > clks[IMX8MQ_CLK_EXT4] = of_clk_get_by_name(np, "clk_ext4"); > > > > - np = of_find_compatible_node(NULL, NULL, "fsl,imx8mq-anatop"); > > - base = of_iomap(np, 0); > > + anatop_np = of_find_compatible_node(NULL, NULL, "fsl,imx8mq- > > anatop"); > > + base = of_iomap(anatop_np, 0); > > if (WARN_ON(!base)) > > - return -ENOMEM; > > + return; > > > > clks[IMX8MQ_ARM_PLL_REF_SEL] = imx_clk_mux("arm_pll_ref_sel", > base + > > 0x28, 16, 2, pll_ref_sels, ARRAY_SIZE(pll_ref_sels)); > > clks[IMX8MQ_GPU_PLL_REF_SEL] = imx_clk_mux("gpu_pll_ref_sel", > base + > > 0x18, 16, 2, pll_ref_sels, ARRAY_SIZE(pll_ref_sels)); @@ -389,10 > > +388,9 @@ static int imx8mq_clocks_probe(struct platform_device *pdev) > > clks[IMX8MQ_SYS2_PLL_500M] = > > imx_clk_fixed_factor("sys2_pll_500m", "sys2_pll_out", 1, 2); > > clks[IMX8MQ_SYS2_PLL_1000M] = > > imx_clk_fixed_factor("sys2_pll_1000m", "sys2_pll_out", 1, 1); > > > > - np = dev->of_node; > > base = of_iomap(np, 0); > > if (WARN_ON(!base)) > > - return -ENOMEM; > > + return; > > > > /* CORE */ > > clks[IMX8MQ_CLK_A53_SRC] = imx_clk_mux2("arm_a53_src", base + > > 0x8000, 24, 3, imx8mq_a53_sels, ARRAY_SIZE(imx8mq_a53_sels)); @@ > > -568,22 +566,5 @@ static int imx8mq_clocks_probe(struct > > platform_device *pdev) > > > > err = of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data); > > WARN_ON(err); > > - > > - return err; > > } > > - > > -static const struct of_device_id imx8mq_clk_of_match[] = { > > - { .compatible = "fsl,imx8mq-ccm" }, > > - { /* Sentinel */ }, > > -}; > > -MODULE_DEVICE_TABLE(of, imx8mq_clk_of_match); > > - > > - > > -static struct platform_driver imx8mq_clk_driver = { > > - .probe = imx8mq_clocks_probe, > > - .driver = { > > - .name = "imx8mq-ccm", > > - .of_match_table = of_match_ptr(imx8mq_clk_of_match), > > - }, > > -}; > > -module_platform_driver(imx8mq_clk_driver); > > +CLK_OF_DECLARE(imx8mq, "fsl,imx8mq-ccm", imx8mq_clocks_init);
Best Regards! Anson Huang > -----Original Message----- > From: Anson Huang > Sent: 2019年2月23日 11:04 > To: Lucas Stach <l.stach@pengutronix.de>; robh+dt@kernel.org; > mark.rutland@arm.com; shawnguo@kernel.org; s.hauer@pengutronix.de; > kernel@pengutronix.de; festevam@gmail.com; mturquette@baylibre.com; > sboyd@kernel.org; Abel Vesa <abel.vesa@nxp.com>; ccaione@baylibre.com; > agx@sigxcpu.org; devicetree@vger.kernel.org; linux-arm- > kernel@lists.infradead.org; linux-kernel@vger.kernel.org; linux- > clk@vger.kernel.org > Cc: dl-linux-imx <linux-imx@nxp.com> > Subject: RE: [PATCH 1/3] clk: imx8mq: initialize clock tree earlier > > Hi, Lucas > > Best Regards! > Anson Huang > > > -----Original Message----- > > From: Lucas Stach [mailto:l.stach@pengutronix.de] > > Sent: 2019年2月22日 18:55 > > To: Anson Huang <anson.huang@nxp.com>; robh+dt@kernel.org; > > mark.rutland@arm.com; shawnguo@kernel.org; s.hauer@pengutronix.de; > > kernel@pengutronix.de; festevam@gmail.com; mturquette@baylibre.com; > > sboyd@kernel.org; Abel Vesa <abel.vesa@nxp.com>; > ccaione@baylibre.com; > > agx@sigxcpu.org; devicetree@vger.kernel.org; linux-arm- > > kernel@lists.infradead.org; linux-kernel@vger.kernel.org; linux- > > clk@vger.kernel.org > > Cc: dl-linux-imx <linux-imx@nxp.com> > > Subject: Re: [PATCH 1/3] clk: imx8mq: initialize clock tree earlier > > > > Am Freitag, den 22.02.2019, 09:42 +0000 schrieb Anson Huang: > > > Currently on i.MX8MQ platform, clock driver is probed later than > > > GPIO driver, and GPIO driver does NOT have defer probe mechanism > > > since the GPIO clock is optional, > > > > So this is what should be fixed. If there is a clock reference in the > > DT, having the clock driver ready is not optional. Optional to the > > GPIO driver just means it won't fail if there is no clock reference at all. > > If there is and the clock provider is not yet there, it needs to do a > > PROBE_DEFER. > > > > So that's a NACK on this patch. > > OK, I see. Then I will do a patch for GPIO driver, and I just check other drivers, > looks like imx2 watchdog driver also has similar issue, I will do a patch too. Just double check the watch dog driver, its clock is NOT optional, and just return the error value, so it should be OK, sorry for the noise. Anson. > > Thanks, > Anson. > > > > > Regards, > > Lucas > > > > > some platforms have GPIO clocks and some are NOT. So it is an issue > > > that on i.MX8MQ platform, there are GPIO clocks defined, but due to > > > clock tree is NOT ready during GPIO driver probe, the GPIO clock > > > management will fail and cause system hang if GPIO clocks are OFF by > > > default. > > > > > > This patch changes the i.MX8MQ clock tree initialization using > > > CLK_OF_DECLARE instead of platform driver model to make clock tree > > > ready earlier than GPIO driver. > > > > > > Signed-off-by: Anson Huang <Anson.Huang@nxp.com> > > > --- > > > drivers/clk/imx/clk-imx8mq.c | 33 +++++++-------------------------- > > > 1 file changed, 7 insertions(+), 26 deletions(-) > > > > > > diff --git a/drivers/clk/imx/clk-imx8mq.c b/drivers/clk/imx/clk- > > > imx8mq.c index 26b57f4..2df1575 100644 > > > --- a/drivers/clk/imx/clk-imx8mq.c > > > +++ b/drivers/clk/imx/clk-imx8mq.c > > > @@ -269,10 +269,9 @@ static const char *imx8mq_clko2_sels[] = > > > {"osc_25m", "sys2_pll_200m", "sys1_pll_ > > > > > > static struct clk_onecell_data clk_data; > > > > > > -static int imx8mq_clocks_probe(struct platform_device *pdev) > > > +static void __init imx8mq_clocks_init(struct device_node *np) > > > { > > > - struct device *dev = &pdev->dev; > > > - struct device_node *np = dev->of_node; > > > + struct device_node *anatop_np; > > > void __iomem *base; > > > int err; > > > int i; > > > @@ -286,10 +285,10 @@ static int imx8mq_clocks_probe(struct > > > platform_device *pdev) > > > clks[IMX8MQ_CLK_EXT3] = of_clk_get_by_name(np, "clk_ext3"); > > > clks[IMX8MQ_CLK_EXT4] = of_clk_get_by_name(np, "clk_ext4"); > > > > > > - np = of_find_compatible_node(NULL, NULL, "fsl,imx8mq-anatop"); > > > - base = of_iomap(np, 0); > > > + anatop_np = of_find_compatible_node(NULL, NULL, "fsl,imx8mq- > > > anatop"); > > > + base = of_iomap(anatop_np, 0); > > > if (WARN_ON(!base)) > > > - return -ENOMEM; > > > + return; > > > > > > clks[IMX8MQ_ARM_PLL_REF_SEL] = imx_clk_mux("arm_pll_ref_sel", > > base + > > > 0x28, 16, 2, pll_ref_sels, ARRAY_SIZE(pll_ref_sels)); > > > clks[IMX8MQ_GPU_PLL_REF_SEL] = imx_clk_mux("gpu_pll_ref_sel", > > base + > > > 0x18, 16, 2, pll_ref_sels, ARRAY_SIZE(pll_ref_sels)); @@ -389,10 > > > +388,9 @@ static int imx8mq_clocks_probe(struct platform_device > > > +*pdev) > > > clks[IMX8MQ_SYS2_PLL_500M] = > > > imx_clk_fixed_factor("sys2_pll_500m", "sys2_pll_out", 1, 2); > > > clks[IMX8MQ_SYS2_PLL_1000M] = > > > imx_clk_fixed_factor("sys2_pll_1000m", "sys2_pll_out", 1, 1); > > > > > > - np = dev->of_node; > > > base = of_iomap(np, 0); > > > if (WARN_ON(!base)) > > > - return -ENOMEM; > > > + return; > > > > > > /* CORE */ > > > clks[IMX8MQ_CLK_A53_SRC] = imx_clk_mux2("arm_a53_src", base + > > > 0x8000, 24, 3, imx8mq_a53_sels, ARRAY_SIZE(imx8mq_a53_sels)); @@ > > > -568,22 +566,5 @@ static int imx8mq_clocks_probe(struct > > > platform_device *pdev) > > > > > > err = of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data); > > > WARN_ON(err); > > > - > > > - return err; > > > } > > > - > > > -static const struct of_device_id imx8mq_clk_of_match[] = { > > > - { .compatible = "fsl,imx8mq-ccm" }, > > > - { /* Sentinel */ }, > > > -}; > > > -MODULE_DEVICE_TABLE(of, imx8mq_clk_of_match); > > > - > > > - > > > -static struct platform_driver imx8mq_clk_driver = { > > > - .probe = imx8mq_clocks_probe, > > > - .driver = { > > > - .name = "imx8mq-ccm", > > > - .of_match_table = of_match_ptr(imx8mq_clk_of_match), > > > - }, > > > -}; > > > -module_platform_driver(imx8mq_clk_driver); > > > +CLK_OF_DECLARE(imx8mq, "fsl,imx8mq-ccm", imx8mq_clocks_init);
diff --git a/drivers/clk/imx/clk-imx8mq.c b/drivers/clk/imx/clk-imx8mq.c index 26b57f4..2df1575 100644 --- a/drivers/clk/imx/clk-imx8mq.c +++ b/drivers/clk/imx/clk-imx8mq.c @@ -269,10 +269,9 @@ static const char *imx8mq_clko2_sels[] = {"osc_25m", "sys2_pll_200m", "sys1_pll_ static struct clk_onecell_data clk_data; -static int imx8mq_clocks_probe(struct platform_device *pdev) +static void __init imx8mq_clocks_init(struct device_node *np) { - struct device *dev = &pdev->dev; - struct device_node *np = dev->of_node; + struct device_node *anatop_np; void __iomem *base; int err; int i; @@ -286,10 +285,10 @@ static int imx8mq_clocks_probe(struct platform_device *pdev) clks[IMX8MQ_CLK_EXT3] = of_clk_get_by_name(np, "clk_ext3"); clks[IMX8MQ_CLK_EXT4] = of_clk_get_by_name(np, "clk_ext4"); - np = of_find_compatible_node(NULL, NULL, "fsl,imx8mq-anatop"); - base = of_iomap(np, 0); + anatop_np = of_find_compatible_node(NULL, NULL, "fsl,imx8mq-anatop"); + base = of_iomap(anatop_np, 0); if (WARN_ON(!base)) - return -ENOMEM; + return; clks[IMX8MQ_ARM_PLL_REF_SEL] = imx_clk_mux("arm_pll_ref_sel", base + 0x28, 16, 2, pll_ref_sels, ARRAY_SIZE(pll_ref_sels)); clks[IMX8MQ_GPU_PLL_REF_SEL] = imx_clk_mux("gpu_pll_ref_sel", base + 0x18, 16, 2, pll_ref_sels, ARRAY_SIZE(pll_ref_sels)); @@ -389,10 +388,9 @@ static int imx8mq_clocks_probe(struct platform_device *pdev) clks[IMX8MQ_SYS2_PLL_500M] = imx_clk_fixed_factor("sys2_pll_500m", "sys2_pll_out", 1, 2); clks[IMX8MQ_SYS2_PLL_1000M] = imx_clk_fixed_factor("sys2_pll_1000m", "sys2_pll_out", 1, 1); - np = dev->of_node; base = of_iomap(np, 0); if (WARN_ON(!base)) - return -ENOMEM; + return; /* CORE */ clks[IMX8MQ_CLK_A53_SRC] = imx_clk_mux2("arm_a53_src", base + 0x8000, 24, 3, imx8mq_a53_sels, ARRAY_SIZE(imx8mq_a53_sels)); @@ -568,22 +566,5 @@ static int imx8mq_clocks_probe(struct platform_device *pdev) err = of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data); WARN_ON(err); - - return err; } - -static const struct of_device_id imx8mq_clk_of_match[] = { - { .compatible = "fsl,imx8mq-ccm" }, - { /* Sentinel */ }, -}; -MODULE_DEVICE_TABLE(of, imx8mq_clk_of_match); - - -static struct platform_driver imx8mq_clk_driver = { - .probe = imx8mq_clocks_probe, - .driver = { - .name = "imx8mq-ccm", - .of_match_table = of_match_ptr(imx8mq_clk_of_match), - }, -}; -module_platform_driver(imx8mq_clk_driver); +CLK_OF_DECLARE(imx8mq, "fsl,imx8mq-ccm", imx8mq_clocks_init);
Currently on i.MX8MQ platform, clock driver is probed later than GPIO driver, and GPIO driver does NOT have defer probe mechanism since the GPIO clock is optional, some platforms have GPIO clocks and some are NOT. So it is an issue that on i.MX8MQ platform, there are GPIO clocks defined, but due to clock tree is NOT ready during GPIO driver probe, the GPIO clock management will fail and cause system hang if GPIO clocks are OFF by default. This patch changes the i.MX8MQ clock tree initialization using CLK_OF_DECLARE instead of platform driver model to make clock tree ready earlier than GPIO driver. Signed-off-by: Anson Huang <Anson.Huang@nxp.com> --- drivers/clk/imx/clk-imx8mq.c | 33 +++++++-------------------------- 1 file changed, 7 insertions(+), 26 deletions(-)