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(2001-1c00-0c1e-bf00-1db8-22d3-1bc9-8ca1.cable.dynamic.v6.ziggo.nl. [2001:1c00:c1e:bf00:1db8:22d3:1bc9:8ca1]) by smtp.gmail.com with ESMTPSA id cr8sm1386979edb.47.2022.01.20.06.39.40 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 20 Jan 2022 06:39:40 -0800 (PST) Message-ID: <1ff8954c-9894-b0cd-a261-afc30ff02e6b@redhat.com> Date: Thu, 20 Jan 2022 15:39:39 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.3.0 Subject: Re: [PATCH v4 4/9] spi: Add API to count spi acpi resources Content-Language: en-US To: Stefan Binding , Mark Brown , "Rafael J . Wysocki" , Len Brown , Mark Gross , Jaroslav Kysela , Takashi Iwai Cc: alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org, linux-acpi@vger.kernel.org, platform-driver-x86@vger.kernel.org, patches@opensource.cirrus.com References: <20220120134326.5295-1-sbinding@opensource.cirrus.com> <20220120134326.5295-5-sbinding@opensource.cirrus.com> From: Hans de Goede In-Reply-To: <20220120134326.5295-5-sbinding@opensource.cirrus.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, On 1/20/22 14:43, Stefan Binding wrote: > Some ACPI nodes may have more than one Spi Resource. > To be able to handle these case, its necessary to have > a way of counting these resources. > > Signed-off-by: Stefan Binding Thanks, patch looks good to me: Reviewed-by: Hans de Goede Regards, Hans > --- > drivers/spi/spi.c | 40 ++++++++++++++++++++++++++++++++++++++++ > include/linux/spi/spi.h | 6 ++++++ > 2 files changed, 46 insertions(+) > > diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c > index 898cc9931490..8c0c2e26609a 100644 > --- a/drivers/spi/spi.c > +++ b/drivers/spi/spi.c > @@ -2325,6 +2325,46 @@ struct acpi_spi_lookup { > int irq_index; > }; > > +static int acpi_spi_count(struct acpi_resource *ares, void *data) > +{ > + struct acpi_resource_spi_serialbus *sb; > + int *count = data; > + > + if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) > + return 1; > + > + sb = &ares->data.spi_serial_bus; > + if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_SPI) > + return 1; > + > + *count = *count + 1; > + > + return 1; > +} > + > +/** > + * acpi_spi_count_resources - Count the number of SpiSerialBus resources > + * @adev: ACPI device > + * > + * Returns the number of SpiSerialBus resources in the ACPI-device's > + * resource-list; or a negative error code. > + */ > +int acpi_spi_count_resources(struct acpi_device *adev) > +{ > + LIST_HEAD(r); > + int count = 0; > + int ret; > + > + ret = acpi_dev_get_resources(adev, &r, acpi_spi_count, &count); > + if (ret < 0) > + return ret; > + > + acpi_dev_free_resource_list(&r); > + > + return count; > +} > +EXPORT_SYMBOL_GPL(acpi_spi_count_resources); > + > static void acpi_spi_parse_apple_properties(struct acpi_device *dev, > struct acpi_spi_lookup *lookup) > { > diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h > index 1a34fd0f6ca2..25a82729f8da 100644 > --- a/include/linux/spi/spi.h > +++ b/include/linux/spi/spi.h > @@ -764,6 +764,7 @@ extern void spi_unregister_controller(struct spi_controller *ctlr); > extern struct spi_device *acpi_spi_device_alloc(struct spi_controller *ctlr, > struct acpi_device *adev, > int index, int irq_index); > +int acpi_spi_count_resources(struct acpi_device *adev); > #else > static inline struct spi_device *acpi_spi_device_alloc(struct spi_controller *ctlr, > struct acpi_device *adev, > @@ -771,6 +772,11 @@ static inline struct spi_device *acpi_spi_device_alloc(struct spi_controller *ct > { > return ERR_PTR(-EOPNOTSUPP); > } > + > +int acpi_spi_count_resources(struct acpi_device *adev) > +{ > + return -EOPNOTSUPP; > +} > #endif > > /* >