From mboxrd@z Thu Jan 1 00:00:00 1970 From: kamlakant.patel-dY08KVG/lbpWk0Htik3J/w@public.gmane.org Subject: [PATCH] spi: vulcan: Add ACPI support for SPI driver Date: Tue, 26 Jul 2016 10:52:06 +0530 Message-ID: <1469510526-7593-1-git-send-email-kamlakant.patel@broadcom.com> Cc: Kamlakant Patel , linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Jayachandran C To: Mark Brown Return-path: Sender: linux-spi-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-ID: From: Kamlakant Patel Add ACPI support for SPI controller driver on Broadcom Vulcan ARM64 plateform. Signed-off-by: Kamlakant Patel --- drivers/spi/spi-xlp.c | 33 ++++++++++++++++++++++++++++----- 1 files changed, 28 insertions(+), 5 deletions(-) diff --git a/drivers/spi/spi-xlp.c b/drivers/spi/spi-xlp.c index 8f04fec..7494254 100644 --- a/drivers/spi/spi-xlp.c +++ b/drivers/spi/spi-xlp.c @@ -11,6 +11,7 @@ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ +#include #include #include #include @@ -85,7 +86,7 @@ #define XLP_SPI_TXRXTH 0x80 #define XLP_SPI_FIFO_SIZE 8 #define XLP_SPI_MAX_CS 4 -#define XLP_SPI_DEFAULT_FREQ 133333333 +#define VULCAN_SPI_DEFAULT_FREQ 133000000 #define XLP_SPI_FDIV_MIN 4 #define XLP_SPI_FDIV_MAX 65535 /* @@ -403,11 +404,24 @@ static int xlp_spi_probe(struct platform_device *pdev) } clk = devm_clk_get(&pdev->dev, NULL); - if (IS_ERR(clk)) { - dev_err(&pdev->dev, "could not get spi clock\n"); - return -ENODEV; + if (!IS_ERR(clk)) { + xspi->spi_clk = clk_get_rate(clk); + } else { + u32 freq; + + err = device_property_read_u32(&pdev->dev, + "clock-frequency", &freq); + if (err) { + /* + * Use default SPI frequency for Vulcan unless + * changed by firmaware. + */ + dev_err(&pdev->dev, "Can't get clock-frequency, + using default\n"); + freq = VULCAN_SPI_DEFAULT_FREQ; + } + xspi->spi_clk = freq; } - xspi->spi_clk = clk_get_rate(clk); master = spi_alloc_master(&pdev->dev, 0); if (!master) { @@ -437,6 +451,14 @@ static int xlp_spi_probe(struct platform_device *pdev) return 0; } +#ifdef CONFIG_ACPI +static const struct acpi_device_id xlp_spi_acpi_match[] = { + { "BRCM900D", 0 }, + { }, +}; +MODULE_DEVICE_TABLE(acpi, xlp_spi_acpi_match); +#endif + static const struct of_device_id xlp_spi_dt_id[] = { { .compatible = "netlogic,xlp832-spi" }, { }, @@ -447,6 +469,7 @@ static struct platform_driver xlp_spi_driver = { .driver = { .name = "xlp-spi", .of_match_table = xlp_spi_dt_id, + .acpi_match_table = ACPI_PTR(xlp_spi_acpi_match), }, }; module_platform_driver(xlp_spi_driver); -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-spi" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html