Thread (13 messages) 13 messages, 3 authors, 2018-09-19

[PATCH v2 1/5] spi: spi-mem: Add driver for NXP FlexSPI controller

From: Frieder Schrempf <hidden>
Date: 2018-09-18 08:34:29
Also in: linux-devicetree, linux-spi, lkml

Hi Boris, Yogesh,

On 17.09.2018 13:37, Boris Brezillon wrote:
Hi Yogesh,

On Mon, 17 Sep 2018 15:18:26 +0530
Yogesh Gaur [off-list ref] wrote:
quoted
+
+	/*
+	 * R/W functions for big- or little-endian registers:
+	 * The FSPI controller's endianness is independent of
+	 * the CPU core's endianness. So far, although the CPU
+	 * core is little-endian the FSPI controller can use
+	 * big-endian or little-endian.
+	 */
+	if (of_property_read_bool(np, "big-endian")) {
+		f->write = fspi_writel_be;
+		f->read = fspi_readl_be;
+	} else {
+		f->write = fspi_writel;
+		f->read = fspi_readl;
+	}
Hm, isn't it something you can extract from the compatible string? I'd
rather not allow users to set that in their DT if it's not something
you can change.
This was copied from the QSPI driver, but I think Boris is right. This 
seems to be a fixed SOC-specific setting and we shouldn't set it in the 
DT. This applies to QSPI and FSPI alike.

Regards,
Frieder
Regards,

Boris
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