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From 3e45577e70cbf8fdc5c13033114989794a3797d5 Mon Sep 17 00:00:00 2001
From: Miquel Raynal <miquel.raynal@bootlin.com>
Date: Thu, 27 Jan 2022 10:17:56 +0100
Subject: [PATCH 04/15] spi: spi-mem: Introduce a capability structure
Create a spi_controller_mem_caps structure and put it within the
spi_controller structure close to the spi_controller_mem_ops
strucure. So far the only field in this structure is the support for dtr
operations, but soon we will add another parameter.
Also create a helper to parse the capabilities and check if the
requested capability has been set or not.
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Pratyush Yadav <p.yadav@ti.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/linux-mtd/20220127091808.1043392-2-miquel.raynal@bootlin.com
(cherry picked from commit 4a3cc7fb6e63bcfdedec25364738f1493345bd20)
---
include/linux/spi/spi-mem.h | 11 +++++++++++
include/linux/spi/spi.h | 3 +++
2 files changed, 14 insertions(+)
--- a/include/linux/spi/spi-mem.h
+++ b/include/linux/spi/spi-mem.h
@@ -286,6 +286,17 @@ struct spi_controller_mem_ops {
};
/**
+ * struct spi_controller_mem_caps - SPI memory controller capabilities
+ * @dtr: Supports DTR operations
+ */
+struct spi_controller_mem_caps {
+ bool dtr;
+};
+
+#define spi_mem_controller_is_capable(ctlr, cap) \
+ ((ctlr)->mem_caps && (ctlr)->mem_caps->cap)
+
+/**
* struct spi_mem_driver - SPI memory driver
* @spidrv: inherit from a SPI driver
* @probe: probe a SPI memory. Usually where detection/initialization takes
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -23,6 +23,7 @@ struct software_node;
struct spi_controller;
struct spi_transfer;
struct spi_controller_mem_ops;
+struct spi_controller_mem_caps;
/*
* INTERFACES between SPI master-side drivers and SPI slave protocol handlers,
@@ -419,6 +420,7 @@ extern struct spi_device *spi_new_ancill
* @mem_ops: optimized/dedicated operations for interactions with SPI memory.
* This field is optional and should only be implemented if the
* controller has native support for memory like operations.
+ * @mem_caps: controller capabilities for the handling of memory operations.
* @unprepare_message: undo any work done by prepare_message().
* @slave_abort: abort the ongoing transfer request on an SPI slave controller
* @cs_gpios: LEGACY: array of GPIO descs to use as chip select lines; one per
@@ -643,6 +645,7 @@ struct spi_controller {
/* Optimized handlers for SPI memory-like operations. */
const struct spi_controller_mem_ops *mem_ops;
+ const struct spi_controller_mem_caps *mem_caps;
/* gpio chip select */
int *cs_gpios;
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