linux-kernel - [PATCH v4 12/15] spi: spi-mem: Allow controller supporting mem_ops without exec

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Date:   Thu,  9 Feb 2023 12:02:43 -0800
From:   William Zhang <william.zhang@...adcom.com>
To:     Linux SPI List <linux-spi@...r.kernel.org>,
        Broadcom Kernel List <bcm-kernel-feedback-list@...adcom.com>
Cc:     f.fainelli@...il.com, dregan@...l.com, joel.peshkin@...adcom.com,
        dan.beygelman@...adcom.com, anand.gore@...adcom.com,
        kursad.oney@...adcom.com, tomer.yacoby@...adcom.com,
        jonas.gorski@...il.com, William Zhang <william.zhang@...adcom.com>,
        Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org
Subject: [PATCH v4 12/15] spi: spi-mem: Allow controller supporting mem_ops without exec_op

Currently exec_op is always required if controller driver provides
mem_ops. But some controller such as bcm63xx-hsspi may only need to
implement other operation like supports_op and use the default
execution operation. This patch removes this restriction.

Signed-off-by: William Zhang <william.zhang@...adcom.com>
---

(no changes since v1)

 drivers/spi/spi-mem.c |  2 +-
 drivers/spi/spi.c     | 13 ++++++-------
 2 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/drivers/spi/spi-mem.c b/drivers/spi/spi-mem.c
index 0c79193d9697..701838b6f0c4 100644
--- a/drivers/spi/spi-mem.c
+++ b/drivers/spi/spi-mem.c
@@ -325,7 +325,7 @@ int spi_mem_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
 	if (!spi_mem_internal_supports_op(mem, op))
 		return -ENOTSUPP;
 
-	if (ctlr->mem_ops && !mem->spi->cs_gpiod) {
+	if (ctlr->mem_ops && ctlr->mem_ops->exec_op && !mem->spi->cs_gpiod) {
 		ret = spi_mem_access_start(mem);
 		if (ret)
 			return ret;
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index f4eb447c565d..91f71305817b 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -3072,15 +3072,14 @@ static int spi_controller_check_ops(struct spi_controller *ctlr)
 	 * The controller may implement only the high-level SPI-memory like
 	 * operations if it does not support regular SPI transfers, and this is
 	 * valid use case.
-	 * If ->mem_ops is NULL, we request that at least one of the
-	 * ->transfer_xxx() method be implemented.
+	 * If ->mem_ops or ->mem_ops->exec_op is NULL, we request that at least
+	 * one of the ->transfer_xxx() method be implemented.
 	 */
-	if (ctlr->mem_ops) {
-		if (!ctlr->mem_ops->exec_op)
-			return -EINVAL;
-	} else if (!ctlr->transfer && !ctlr->transfer_one &&
+	if (!ctlr->mem_ops || (ctlr->mem_ops && !ctlr->mem_ops->exec_op)) {
+		if (!ctlr->transfer && !ctlr->transfer_one &&
 		   !ctlr->transfer_one_message) {
-		return -EINVAL;
+			return -EINVAL;
+		}
 	}
 
 	return 0;
-- 
2.37.3