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spi: fsl: fix use of spisel_boot signal on MPC8309 

commit 122541f2b10897b08f7f7e6db5f1eb693e51f0a1 upstream.

Commit 0f0581b24b ("spi: fsl: Convert to use CS GPIO descriptors")
broke the use of the SPISEL_BOOT signal as a chip select on the
MPC8309.

pdata->max_chipselect, which becomes master->num_chipselect, must be
initialized to take into account the possibility that there's one more
chip select in use than the number of GPIO chip selects.

Cc: stable@vger.kernel.org # v5.4+
Cc: Christophe Leroy <christophe.leroy@c-s.fr>
Cc: Linus Walleij <linus.walleij@linaro.org>
Fixes: 0f0581b24b ("spi: fsl: Convert to use CS GPIO descriptors")
Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Link: https://lore.kernel.org/r/20201127152947.376-1-rasmus.villemoes@prevas.dk
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rasmus Villemoes 2020-11-27 16:29:47 +01:00 committed by Greg Kroah-Hartman
parent 614f2529c8
commit ee1d2aef1c
1 changed files with 8 additions and 3 deletions
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11
drivers/spi/spi-fsl-spi.c
View File

@ -717,10 +717,11 @@ static int of_fsl_spi_probe(struct platform_device *ofdev)
type = fsl_spi_get_type(&ofdev->dev);
if (type == TYPE_FSL) {
struct fsl_spi_platform_data *pdata = dev_get_platdata(dev);
bool spisel_boot = false;
#if IS_ENABLED(CONFIG_FSL_SOC)
struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(pdata);
bool spisel_boot = of_property_read_bool(np, "fsl,spisel_boot");
spisel_boot = of_property_read_bool(np, "fsl,spisel_boot");
if (spisel_boot) {
pinfo->immr_spi_cs = ioremap(get_immrbase() + IMMR_SPI_CS_OFFSET, 4);
if (!pinfo->immr_spi_cs) {
@ -737,10 +738,14 @@ static int of_fsl_spi_probe(struct platform_device *ofdev)
* supported on the GRLIB variant.
*/
ret = gpiod_count(dev, "cs");
if (ret <= 0)
if (ret < 0)
ret = 0;
if (ret == 0 && !spisel_boot) {
pdata->max_chipselect = 1;
else
} else {
pdata->max_chipselect = ret + spisel_boot;
pdata->cs_control = fsl_spi_cs_control;
}
}
ret = of_address_to_resource(np, 0, &mem);