linux-kernel - [PATCH v5 2/4] spi: pxa2xx: Respect Intel SSP type given by a property

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Message-Id: <20221021190018.63646-3-andriy.shevchenko@linux.intel.com>
Date:   Fri, 21 Oct 2022 22:00:16 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mark Brown <broonie@...nel.org>,
        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>
Subject: [PATCH v5 2/4] 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 LPSS devices.

The check is done by the looking for the specifically
named IO memory resource provided by upper layer. This
won't be an issue in the future because we strictly
prioritize the order in which we are looking for the SSP
type in the code.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/spi/spi-pxa2xx.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index 93be7e8ef884..5527bcc5c729 100644
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -1462,9 +1462,12 @@ pxa2xx_spi_init_pdata(struct platform_device *pdev)
 	const struct pci_device_id *pcidev_id = NULL;
 	enum pxa_ssp_type type = SSP_UNDEFINED;
 	const void *match;
+	bool is_lpss_priv;
 	int status;
 	u64 uid;
 
+	is_lpss_priv = platform_get_resource_byname(pdev, IORESOURCE_MEM, "lpss_priv");
+
 	if (pcidev)
 		pcidev_id = pci_match_id(pxa2xx_spi_pci_compound_match, pcidev);
 
@@ -1473,6 +1476,15 @@ pxa2xx_spi_init_pdata(struct platform_device *pdev)
 		type = (enum pxa_ssp_type)match;
 	else if (pcidev_id)
 		type = (enum pxa_ssp_type)pcidev_id->driver_data;
+	else if (is_lpss_priv) {
+		u32 value;
+
+		status = device_property_read_u32(dev, "intel,spi-pxa2xx-type", &value);
+		if (status)
+			return ERR_PTR(status);
+
+		type = (enum pxa_ssp_type)value;
+	}
 
 	/* Validate the SSP type correctness */
 	if (!(type > SSP_UNDEFINED && type < SSP_MAX))
-- 
2.35.1