linux-kernel - [PATCH v4 1/5] spi: pxa2xx: Respect Intel SSP type given by a property

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Message-Id: <20221020194500.10225-2-andriy.shevchenko@linux.intel.com>
Date:   Thu, 20 Oct 2022 22:44:56 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-arm-kernel@...ts.infradead.org, linux-spi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Daniel Mack <daniel@...que.org>,
        Haojian Zhuang <haojian.zhuang@...il.com>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        Mark Brown <broonie@...nel.org>
Subject: [PATCH v4 1/5] spi: pxa2xx: Respect Intel SSP type given by a property

Allow to set the Intel SSP type by reading the property.
Only apply this to the known MFD enumerated devices.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/spi/spi-pxa2xx.c   | 12 ++++++++++++
 include/linux/pxa2xx_ssp.h |  1 +
 2 files changed, 13 insertions(+)

diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index 03ed6d4a14cd..f3ba1b0588fb 100644
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -1460,17 +1460,29 @@ pxa2xx_spi_init_pdata(struct platform_device *pdev)
 	struct resource *res;
 	struct pci_dev *pcidev = dev_is_pci(parent) ? to_pci_dev(parent) : NULL;
 	const struct pci_device_id *pcidev_id = NULL;
+	u32 value = SSP_UNDEFINED;
 	enum pxa_ssp_type type;
+	bool mfd_enumerated;
 	const void *match;
 	int status;
 	u64 uid;
 
+	/* For MFD enumerated devices always ask for a property */
+	mfd_enumerated = platform_get_resource_byname(pdev, IORESOURCE_MEM, "lpss_priv");
+	if (mfd_enumerated) {
+		status = device_property_read_u32(dev, "intel,spi-pxa2xx-type", &value);
+		if (status)
+			return ERR_PTR(status);
+	}
+
 	if (pcidev)
 		pcidev_id = pci_match_id(pxa2xx_spi_pci_compound_match, pcidev);
 
 	match = device_get_match_data(&pdev->dev);
 	if (match)
 		type = (enum pxa_ssp_type)match;
+	else if (value > SSP_UNDEFINED && value < SSP_MAX)
+		type = (enum pxa_ssp_type)value;
 	else if (pcidev_id)
 		type = (enum pxa_ssp_type)pcidev_id->driver_data;
 	else
diff --git a/include/linux/pxa2xx_ssp.h b/include/linux/pxa2xx_ssp.h
index a3fec2de512f..cd1973e6ac4b 100644
--- a/include/linux/pxa2xx_ssp.h
+++ b/include/linux/pxa2xx_ssp.h
@@ -229,6 +229,7 @@ enum pxa_ssp_type {
 	LPSS_SPT_SSP,
 	LPSS_BXT_SSP,
 	LPSS_CNL_SSP,
+	SSP_MAX
 };
 
 struct ssp_device {
-- 
2.35.1