spi: sh-msiof: Move clock management to (un)prepare_message()
Move clock management and pin configuration from the bitbang chipselect()
method to the SPI core prepare_message() and unprepare_message() methods.
As spi_master.{,un}prepare_message() is guaranteed to be called in
matching pairs, the clock management synchronization is no longer needed.
As sh_msiof_spi_set_pin_regs() is no longer called at spi_master.setup()
time (through spi_bitbang_setup() and the spi_bitbang.chipselect()
callback), we now have to take care of that ourselves.
Signed-off-by: Geert Uytterhoeven <geert+renesas@linux-m68k.org>
Acked-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Mark Brown <broonie@linaro.org>
diff --git a/drivers/spi/spi-sh-msiof.c b/drivers/spi/spi-sh-msiof.c
index e7f4797..efeda03 100644
--- a/drivers/spi/spi-sh-msiof.c
+++ b/drivers/spi/spi-sh-msiof.c
@@ -46,7 +46,6 @@
const struct sh_msiof_chipdata *chipdata;
struct sh_msiof_spi_info *info;
struct completion done;
- unsigned long flags;
int tx_fifo_size;
int rx_fifo_size;
};
@@ -459,6 +458,7 @@
static int sh_msiof_spi_setup(struct spi_device *spi)
{
struct device_node *np = spi->master->dev.of_node;
+ struct sh_msiof_spi_priv *p = spi_master_get_devdata(spi->master);
if (!np) {
/*
@@ -468,12 +468,46 @@
spi->cs_gpio = (uintptr_t)spi->controller_data;
}
+ /* Configure pins before deasserting CS */
+ sh_msiof_spi_set_pin_regs(p, !!(spi->mode & SPI_CPOL),
+ !!(spi->mode & SPI_CPHA),
+ !!(spi->mode & SPI_3WIRE),
+ !!(spi->mode & SPI_LSB_FIRST),
+ !!(spi->mode & SPI_CS_HIGH));
+
return spi_bitbang_setup(spi);
}
+static int sh_msiof_prepare_message(struct spi_master *master,
+ struct spi_message *msg)
+{
+ struct sh_msiof_spi_priv *p = spi_master_get_devdata(master);
+ const struct spi_device *spi = msg->spi;
+
+ pm_runtime_get_sync(&p->pdev->dev);
+ clk_enable(p->clk);
+
+ /* Configure pins before asserting CS */
+ sh_msiof_spi_set_pin_regs(p, !!(spi->mode & SPI_CPOL),
+ !!(spi->mode & SPI_CPHA),
+ !!(spi->mode & SPI_3WIRE),
+ !!(spi->mode & SPI_LSB_FIRST),
+ !!(spi->mode & SPI_CS_HIGH));
+ return 0;
+}
+
+static int sh_msiof_unprepare_message(struct spi_master *master,
+ struct spi_message *msg)
+{
+ struct sh_msiof_spi_priv *p = spi_master_get_devdata(master);
+
+ clk_disable(p->clk);
+ pm_runtime_put(&p->pdev->dev);
+ return 0;
+}
+
static void sh_msiof_spi_chipselect(struct spi_device *spi, int is_on)
{
- struct sh_msiof_spi_priv *p = spi_master_get_devdata(spi->master);
int value;
/* chip select is active low unless SPI_CS_HIGH is set */
@@ -482,29 +516,8 @@
else
value = (is_on == BITBANG_CS_ACTIVE) ? 0 : 1;
- if (is_on == BITBANG_CS_ACTIVE) {
- if (!test_and_set_bit(0, &p->flags)) {
- pm_runtime_get_sync(&p->pdev->dev);
- clk_enable(p->clk);
- }
-
- /* Configure pins before asserting CS */
- sh_msiof_spi_set_pin_regs(p, !!(spi->mode & SPI_CPOL),
- !!(spi->mode & SPI_CPHA),
- !!(spi->mode & SPI_3WIRE),
- !!(spi->mode & SPI_LSB_FIRST),
- !!(spi->mode & SPI_CS_HIGH));
- }
-
if (spi->cs_gpio >= 0)
gpio_set_value(spi->cs_gpio, value);
-
- if (is_on == BITBANG_CS_INACTIVE) {
- if (test_and_clear_bit(0, &p->flags)) {
- clk_disable(p->clk);
- pm_runtime_put(&p->pdev->dev);
- }
- }
}
static int sh_msiof_spi_txrx_once(struct sh_msiof_spi_priv *p,
@@ -811,6 +824,8 @@
master->num_chipselect = p->info->num_chipselect;
master->setup = sh_msiof_spi_setup;
master->cleanup = spi_bitbang_cleanup;
+ master->prepare_message = sh_msiof_prepare_message;
+ master->unprepare_message = sh_msiof_unprepare_message;
p->bitbang.master = master;
p->bitbang.chipselect = sh_msiof_spi_chipselect;