diff mbox series

[v2,1/8] i2c: i2c-qcom-geni: Provide support for ACPI

Message ID 20190607082901.6491-1-lee.jones@linaro.org (mailing list archive)
State Superseded
Headers show
Series [v2,1/8] i2c: i2c-qcom-geni: Provide support for ACPI | expand

Commit Message

Lee Jones June 7, 2019, 8:28 a.m. UTC
Add a match table to allow automatic probing of ACPI device
QCOM0220.  Ignore clock attainment errors.  Set default clock
frequency value.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
 drivers/i2c/busses/i2c-qcom-geni.c | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

Comments

Ard Biesheuvel June 7, 2019, 11:08 a.m. UTC | #1
On Fri, 7 Jun 2019 at 10:29, Lee Jones <lee.jones@linaro.org> wrote:
>
> Add a match table to allow automatic probing of ACPI device
> QCOM0220.  Ignore clock attainment errors.  Set default clock
> frequency value.
>
> Signed-off-by: Lee Jones <lee.jones@linaro.org>
> ---
>  drivers/i2c/busses/i2c-qcom-geni.c | 19 +++++++++++++++++--
>  1 file changed, 17 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/i2c/busses/i2c-qcom-geni.c b/drivers/i2c/busses/i2c-qcom-geni.c
> index db075bc0d952..0fa93b448e8d 100644
> --- a/drivers/i2c/busses/i2c-qcom-geni.c
> +++ b/drivers/i2c/busses/i2c-qcom-geni.c
> @@ -1,6 +1,7 @@
>  // SPDX-License-Identifier: GPL-2.0
>  // Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.
>
> +#include <linux/acpi.h>
>  #include <linux/clk.h>
>  #include <linux/dma-mapping.h>
>  #include <linux/err.h>
> @@ -483,6 +484,12 @@ static const struct i2c_algorithm geni_i2c_algo = {
>         .functionality  = geni_i2c_func,
>  };
>
> +static const struct acpi_device_id geni_i2c_acpi_match[] = {
> +       { "QCOM0220"},
> +       { },
> +};
> +MODULE_DEVICE_TABLE(acpi, geni_i2c_acpi_match);
> +

We usually put #ifdef CONFIG_ACPI/#endif around these, otherwise you
end up with acpi:XXXX modaliases even though ACPI is not compiled in.

>  static int geni_i2c_probe(struct platform_device *pdev)
>  {
>         struct geni_i2c_dev *gi2c;
> @@ -502,7 +509,7 @@ static int geni_i2c_probe(struct platform_device *pdev)
>                 return PTR_ERR(gi2c->se.base);
>
>         gi2c->se.clk = devm_clk_get(&pdev->dev, "se");

Can we avoid this call altogether in ACPI mode? Also, please use
'has_acpi_companion()' to test whether we are probing via ACPI.

> -       if (IS_ERR(gi2c->se.clk)) {
> +       if (IS_ERR(gi2c->se.clk) && !ACPI_HANDLE(&pdev->dev)) {


>                 ret = PTR_ERR(gi2c->se.clk);
>                 dev_err(&pdev->dev, "Err getting SE Core clk %d\n", ret);
>                 return ret;
> @@ -510,12 +517,19 @@ static int geni_i2c_probe(struct platform_device *pdev)
>
>         ret = device_property_read_u32(&pdev->dev, "clock-frequency",
>                                                         &gi2c->clk_freq_out);
> -       if (ret) {
> +       if (ret && !ACPI_HANDLE(&pdev->dev)) {
>                 dev_info(&pdev->dev,
>                         "Bus frequency not specified, default to 100kHz.\n");
>                 gi2c->clk_freq_out = KHZ(100);
>         }
>
> +       if (ACPI_HANDLE(&pdev->dev)) {
> +               ACPI_COMPANION_SET(&gi2c->adap.dev, ACPI_COMPANION(&pdev->dev));
> +
> +               /* Using default, same as the !ACPI case above */
> +               gi2c->clk_freq_out = KHZ(100);
> +       }
> +

You are overriding the speed to 100 kHz even if the ACPI device has a
"clock-frequency" property.

>         gi2c->irq = platform_get_irq(pdev, 0);
>         if (gi2c->irq < 0) {
>                 dev_err(&pdev->dev, "IRQ error for i2c-geni\n");
> @@ -660,6 +674,7 @@ static struct platform_driver geni_i2c_driver = {
>                 .name = "geni_i2c",
>                 .pm = &geni_i2c_pm_ops,
>                 .of_match_table = geni_i2c_dt_match,
> +               .acpi_match_table = ACPI_PTR(geni_i2c_acpi_match),
>         },
>  };
>
> --
> 2.17.1
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
Lee Jones June 10, 2019, 6:44 a.m. UTC | #2
On Fri, 07 Jun 2019, Ard Biesheuvel wrote:

> On Fri, 7 Jun 2019 at 10:29, Lee Jones <lee.jones@linaro.org> wrote:
> >
> > Add a match table to allow automatic probing of ACPI device
> > QCOM0220.  Ignore clock attainment errors.  Set default clock
> > frequency value.
> >
> > Signed-off-by: Lee Jones <lee.jones@linaro.org>
> > ---
> >  drivers/i2c/busses/i2c-qcom-geni.c | 19 +++++++++++++++++--
> >  1 file changed, 17 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/i2c/busses/i2c-qcom-geni.c b/drivers/i2c/busses/i2c-qcom-geni.c
> > index db075bc0d952..0fa93b448e8d 100644
> > --- a/drivers/i2c/busses/i2c-qcom-geni.c
> > +++ b/drivers/i2c/busses/i2c-qcom-geni.c
> > @@ -1,6 +1,7 @@
> >  // SPDX-License-Identifier: GPL-2.0
> >  // Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.
> >
> > +#include <linux/acpi.h>
> >  #include <linux/clk.h>
> >  #include <linux/dma-mapping.h>
> >  #include <linux/err.h>
> > @@ -483,6 +484,12 @@ static const struct i2c_algorithm geni_i2c_algo = {
> >         .functionality  = geni_i2c_func,
> >  };
> >
> > +static const struct acpi_device_id geni_i2c_acpi_match[] = {
> > +       { "QCOM0220"},
> > +       { },
> > +};
> > +MODULE_DEVICE_TABLE(acpi, geni_i2c_acpi_match);
> > +
> 
> We usually put #ifdef CONFIG_ACPI/#endif around these, otherwise you
> end up with acpi:XXXX modaliases even though ACPI is not compiled in.

No problem.

> >  static int geni_i2c_probe(struct platform_device *pdev)
> >  {
> >         struct geni_i2c_dev *gi2c;
> > @@ -502,7 +509,7 @@ static int geni_i2c_probe(struct platform_device *pdev)
> >                 return PTR_ERR(gi2c->se.base);
> >
> >         gi2c->se.clk = devm_clk_get(&pdev->dev, "se");
> 
> Can we avoid this call altogether in ACPI mode? Also, please use

I'm trying not to place all non-ACPI specific callers into if ()
statements.  The tabbing becomes ridiculous in some places.  A great
deal of these calls are requesting optional resources too, so it's
better to simply ignore the returning error in the cases where
non-optional resources (such as this one) are requested, since it has
the least impact on the existing code.

> 'has_acpi_companion()' to test whether we are probing via ACPI.

Sure.

> > -       if (IS_ERR(gi2c->se.clk)) {
> > +       if (IS_ERR(gi2c->se.clk) && !ACPI_HANDLE(&pdev->dev)) {
> 
> 
> >                 ret = PTR_ERR(gi2c->se.clk);
> >                 dev_err(&pdev->dev, "Err getting SE Core clk %d\n", ret);
> >                 return ret;
> > @@ -510,12 +517,19 @@ static int geni_i2c_probe(struct platform_device *pdev)
> >
> >         ret = device_property_read_u32(&pdev->dev, "clock-frequency",
> >                                                         &gi2c->clk_freq_out);
> > -       if (ret) {
> > +       if (ret && !ACPI_HANDLE(&pdev->dev)) {
> >                 dev_info(&pdev->dev,
> >                         "Bus frequency not specified, default to 100kHz.\n");
> >                 gi2c->clk_freq_out = KHZ(100);
> >         }
> >
> > +       if (ACPI_HANDLE(&pdev->dev)) {
> > +               ACPI_COMPANION_SET(&gi2c->adap.dev, ACPI_COMPANION(&pdev->dev));
> > +
> > +               /* Using default, same as the !ACPI case above */
> > +               gi2c->clk_freq_out = KHZ(100);
> > +       }
> > +
> 
> You are overriding the speed to 100 kHz even if the ACPI device has a
> "clock-frequency" property.

Will look at this.

Thanks Ard.
diff mbox series

Patch

diff --git a/drivers/i2c/busses/i2c-qcom-geni.c b/drivers/i2c/busses/i2c-qcom-geni.c
index db075bc0d952..0fa93b448e8d 100644
--- a/drivers/i2c/busses/i2c-qcom-geni.c
+++ b/drivers/i2c/busses/i2c-qcom-geni.c
@@ -1,6 +1,7 @@ 
 // SPDX-License-Identifier: GPL-2.0
 // Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.
 
+#include <linux/acpi.h>
 #include <linux/clk.h>
 #include <linux/dma-mapping.h>
 #include <linux/err.h>
@@ -483,6 +484,12 @@  static const struct i2c_algorithm geni_i2c_algo = {
 	.functionality	= geni_i2c_func,
 };
 
+static const struct acpi_device_id geni_i2c_acpi_match[] = {
+	{ "QCOM0220"},
+	{ },
+};
+MODULE_DEVICE_TABLE(acpi, geni_i2c_acpi_match);
+
 static int geni_i2c_probe(struct platform_device *pdev)
 {
 	struct geni_i2c_dev *gi2c;
@@ -502,7 +509,7 @@  static int geni_i2c_probe(struct platform_device *pdev)
 		return PTR_ERR(gi2c->se.base);
 
 	gi2c->se.clk = devm_clk_get(&pdev->dev, "se");
-	if (IS_ERR(gi2c->se.clk)) {
+	if (IS_ERR(gi2c->se.clk) && !ACPI_HANDLE(&pdev->dev)) {
 		ret = PTR_ERR(gi2c->se.clk);
 		dev_err(&pdev->dev, "Err getting SE Core clk %d\n", ret);
 		return ret;
@@ -510,12 +517,19 @@  static int geni_i2c_probe(struct platform_device *pdev)
 
 	ret = device_property_read_u32(&pdev->dev, "clock-frequency",
 							&gi2c->clk_freq_out);
-	if (ret) {
+	if (ret && !ACPI_HANDLE(&pdev->dev)) {
 		dev_info(&pdev->dev,
 			"Bus frequency not specified, default to 100kHz.\n");
 		gi2c->clk_freq_out = KHZ(100);
 	}
 
+	if (ACPI_HANDLE(&pdev->dev)) {
+		ACPI_COMPANION_SET(&gi2c->adap.dev, ACPI_COMPANION(&pdev->dev));
+
+		/* Using default, same as the !ACPI case above */
+		gi2c->clk_freq_out = KHZ(100);
+	}
+
 	gi2c->irq = platform_get_irq(pdev, 0);
 	if (gi2c->irq < 0) {
 		dev_err(&pdev->dev, "IRQ error for i2c-geni\n");
@@ -660,6 +674,7 @@  static struct platform_driver geni_i2c_driver = {
 		.name = "geni_i2c",
 		.pm = &geni_i2c_pm_ops,
 		.of_match_table = geni_i2c_dt_match,
+		.acpi_match_table = ACPI_PTR(geni_i2c_acpi_match),
 	},
 };