[PATCH 1/2] spi: mpc512x-psc: Use the framework .set_cs()

* [PATCH 1/2] spi: mpc512x-psc: Use the framework .set_cs()
@ 2020-07-29 21:48 Linus Walleij
  2020-07-29 21:48 ` [PATCH 2/2] spi: mpc512x-psc: Convert to use GPIO descriptors Linus Walleij
  2020-07-30 10:38 ` [PATCH 1/2] spi: mpc512x-psc: Use the framework .set_cs() Mark Brown
  0 siblings, 2 replies; 3+ messages in thread
From: Linus Walleij @ 2020-07-29 21:48 UTC (permalink / raw)
  To: Mark Brown, linux-spi
  Cc: Linus Walleij, Uwe Kleine-König, Anatolij Gustschin, linuxppc-dev

The mpc512x-psc is rolling its own chip select control code,
but the SPI master framework can handle this. It was also
evaluating the CS status for each transfer but the CS change
should be per-message not per-transfer.

Switch to use the core .set_cs() to control the chip select.

Cc: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Cc: Anatolij Gustschin <agust@denx.de>
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 drivers/spi/spi-mpc512x-psc.c | 30 ++++++++----------------------
 1 file changed, 8 insertions(+), 22 deletions(-)

diff --git a/drivers/spi/spi-mpc512x-psc.c b/drivers/spi/spi-mpc512x-psc.c
index ea1b07953d38..35313a77f977 100644
--- a/drivers/spi/spi-mpc512x-psc.c
+++ b/drivers/spi/spi-mpc512x-psc.c
@@ -89,7 +89,7 @@ static int mpc512x_psc_spi_transfer_setup(struct spi_device *spi,
 	return 0;
 }
 
-static void mpc512x_psc_spi_activate_cs(struct spi_device *spi)
+static void mpc512x_psc_spi_set_cs(struct spi_device *spi, bool enable)
 {
 	struct mpc512x_psc_spi_cs *cs = spi->controller_state;
 	struct mpc512x_psc_spi *mps = spi_master_get_devdata(spi->master);
@@ -98,6 +98,12 @@ static void mpc512x_psc_spi_activate_cs(struct spi_device *spi)
 	int speed;
 	u16 bclkdiv;
 
+	if (!enable) {
+		if (mps->cs_control && gpio_is_valid(spi->cs_gpio))
+			mps->cs_control(spi, (spi->mode & SPI_CS_HIGH) ? 0 : 1);
+		return;
+	}
+
 	sicr = in_be32(psc_addr(mps, sicr));
 
 	/* Set clock phase and polarity */
@@ -132,15 +138,6 @@ static void mpc512x_psc_spi_activate_cs(struct spi_device *spi)
 		mps->cs_control(spi, (spi->mode & SPI_CS_HIGH) ? 1 : 0);
 }
 
-static void mpc512x_psc_spi_deactivate_cs(struct spi_device *spi)
-{
-	struct mpc512x_psc_spi *mps = spi_master_get_devdata(spi->master);
-
-	if (mps->cs_control && gpio_is_valid(spi->cs_gpio))
-		mps->cs_control(spi, (spi->mode & SPI_CS_HIGH) ? 0 : 1);
-
-}
-
 /* extract and scale size field in txsz or rxsz */
 #define MPC512x_PSC_FIFO_SZ(sz) ((sz & 0x7ff) << 2);
 
@@ -290,40 +287,28 @@ static int mpc512x_psc_spi_msg_xfer(struct spi_master *master,
 				    struct spi_message *m)
 {
 	struct spi_device *spi;
-	unsigned cs_change;
 	int status;
 	struct spi_transfer *t;
 
 	spi = m->spi;
-	cs_change = 1;
 	status = 0;
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		status = mpc512x_psc_spi_transfer_setup(spi, t);
 		if (status < 0)
 			break;
 
-		if (cs_change)
-			mpc512x_psc_spi_activate_cs(spi);
-		cs_change = t->cs_change;
-
 		status = mpc512x_psc_spi_transfer_rxtx(spi, t);
 		if (status)
 			break;
 		m->actual_length += t->len;
 
 		spi_transfer_delay_exec(t);
-
-		if (cs_change)
-			mpc512x_psc_spi_deactivate_cs(spi);
 	}
 
 	m->status = status;
 	if (m->complete)
 		m->complete(m->context);
 
-	if (status || !cs_change)
-		mpc512x_psc_spi_deactivate_cs(spi);
-
 	mpc512x_psc_spi_transfer_setup(spi, NULL);
 
 	spi_finalize_current_message(master);
@@ -513,6 +498,7 @@ static int mpc512x_psc_spi_do_probe(struct device *dev, u32 regaddr,
 	master->prepare_transfer_hardware = mpc512x_psc_spi_prep_xfer_hw;
 	master->transfer_one_message = mpc512x_psc_spi_msg_xfer;
 	master->unprepare_transfer_hardware = mpc512x_psc_spi_unprep_xfer_hw;
+	master->set_cs = mpc512x_psc_spi_set_cs;
 	master->cleanup = mpc512x_psc_spi_cleanup;
 	master->dev.of_node = dev->of_node;
 
-- 
2.26.2


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