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Message-ID: <20240306160114.3471398-2-andriy.shevchenko@linux.intel.com>
Date: Wed, 6 Mar 2024 17:59:40 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Mark Brown <broonie@...nel.org>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
linux-spi@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v1 1/3] spi: Exctract spi_set_all_cs_unused() helper
It seems a few functions implement the similar for-loop to mark all
chip select pins unused. Let's deduplicate that code in order to have
a single place of that for better maintenance.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
drivers/spi/spi.c | 74 +++++++++++++++--------------------------------
1 file changed, 24 insertions(+), 50 deletions(-)
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index ba4d3fde2054..5e530fa790b0 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -745,6 +745,23 @@ int spi_add_device(struct spi_device *spi)
}
EXPORT_SYMBOL_GPL(spi_add_device);
+static void spi_set_all_cs_unused(struct spi_device *spi)
+{
+ u8 idx;
+
+ /*
+ * Zero(0) is a valid physical CS value and can be located at any
+ * logical CS in the spi->chip_select[]. If all the physical CS
+ * are initialized to 0 then It would be difficult to differentiate
+ * between a valid physical CS 0 & an unused logical CS whose physical
+ * CS can be 0. As a solution to this issue initialize all the CS to 0xFF.
+ * Now all the unused logical CS will have 0xFF physical CS value & can be
+ * ignore while performing physical CS validity checks.
+ */
+ for (idx = 0; idx < SPI_CS_CNT_MAX; idx++)
+ spi_set_chipselect(spi, idx, 0xFF);
+}
+
/**
* spi_new_device - instantiate one new SPI device
* @ctlr: Controller to which device is connected
@@ -764,7 +781,6 @@ struct spi_device *spi_new_device(struct spi_controller *ctlr,
{
struct spi_device *proxy;
int status;
- u8 idx;
/*
* NOTE: caller did any chip->bus_num checks necessary.
@@ -780,19 +796,10 @@ struct spi_device *spi_new_device(struct spi_controller *ctlr,
WARN_ON(strlen(chip->modalias) >= sizeof(proxy->modalias));
- /*
- * Zero(0) is a valid physical CS value and can be located at any
- * logical CS in the spi->chip_select[]. If all the physical CS
- * are initialized to 0 then It would be difficult to differentiate
- * between a valid physical CS 0 & an unused logical CS whose physical
- * CS can be 0. As a solution to this issue initialize all the CS to 0xFF.
- * Now all the unused logical CS will have 0xFF physical CS value & can be
- * ignore while performing physical CS validity checks.
- */
- for (idx = 0; idx < SPI_CS_CNT_MAX; idx++)
- spi_set_chipselect(proxy, idx, 0xFF);
-
+ /* Use provided chip-select for proxy device */
+ spi_set_all_cs_unused(proxy);
spi_set_chipselect(proxy, 0, chip->chip_select);
+
proxy->max_speed_hz = chip->max_speed_hz;
proxy->mode = chip->mode;
proxy->irq = chip->irq;
@@ -2418,17 +2425,7 @@ static int of_spi_parse_dt(struct spi_controller *ctlr, struct spi_device *spi,
return -EINVAL;
}
- /*
- * Zero(0) is a valid physical CS value and can be located at any
- * logical CS in the spi->chip_select[]. If all the physical CS
- * are initialized to 0 then It would be difficult to differentiate
- * between a valid physical CS 0 & an unused logical CS whose physical
- * CS can be 0. As a solution to this issue initialize all the CS to 0xFF.
- * Now all the unused logical CS will have 0xFF physical CS value & can be
- * ignore while performing physical CS validity checks.
- */
- for (idx = 0; idx < SPI_CS_CNT_MAX; idx++)
- spi_set_chipselect(spi, idx, 0xFF);
+ spi_set_all_cs_unused(spi);
/* Device address */
rc = of_property_read_variable_u32_array(nc, "reg", &cs[0], 1,
@@ -2565,7 +2562,6 @@ struct spi_device *spi_new_ancillary_device(struct spi_device *spi,
struct spi_controller *ctlr = spi->controller;
struct spi_device *ancillary;
int rc = 0;
- u8 idx;
/* Alloc an spi_device */
ancillary = spi_alloc_device(ctlr);
@@ -2576,19 +2572,8 @@ struct spi_device *spi_new_ancillary_device(struct spi_device *spi,
strscpy(ancillary->modalias, "dummy", sizeof(ancillary->modalias));
- /*
- * Zero(0) is a valid physical CS value and can be located at any
- * logical CS in the spi->chip_select[]. If all the physical CS
- * are initialized to 0 then It would be difficult to differentiate
- * between a valid physical CS 0 & an unused logical CS whose physical
- * CS can be 0. As a solution to this issue initialize all the CS to 0xFF.
- * Now all the unused logical CS will have 0xFF physical CS value & can be
- * ignore while performing physical CS validity checks.
- */
- for (idx = 0; idx < SPI_CS_CNT_MAX; idx++)
- spi_set_chipselect(ancillary, idx, 0xFF);
-
/* Use provided chip-select for ancillary device */
+ spi_set_all_cs_unused(ancillary);
spi_set_chipselect(ancillary, 0, chip_select);
/* Take over SPI mode/speed from SPI main device */
@@ -2805,7 +2790,6 @@ struct spi_device *acpi_spi_device_alloc(struct spi_controller *ctlr,
struct acpi_spi_lookup lookup = {};
struct spi_device *spi;
int ret;
- u8 idx;
if (!ctlr && index == -1)
return ERR_PTR(-EINVAL);
@@ -2841,24 +2825,14 @@ struct spi_device *acpi_spi_device_alloc(struct spi_controller *ctlr,
return ERR_PTR(-ENOMEM);
}
- /*
- * Zero(0) is a valid physical CS value and can be located at any
- * logical CS in the spi->chip_select[]. If all the physical CS
- * are initialized to 0 then It would be difficult to differentiate
- * between a valid physical CS 0 & an unused logical CS whose physical
- * CS can be 0. As a solution to this issue initialize all the CS to 0xFF.
- * Now all the unused logical CS will have 0xFF physical CS value & can be
- * ignore while performing physical CS validity checks.
- */
- for (idx = 0; idx < SPI_CS_CNT_MAX; idx++)
- spi_set_chipselect(spi, idx, 0xFF);
+ spi_set_all_cs_unused(spi);
+ spi_set_chipselect(spi, 0, lookup.chip_select);
ACPI_COMPANION_SET(&spi->dev, adev);
spi->max_speed_hz = lookup.max_speed_hz;
spi->mode |= lookup.mode;
spi->irq = lookup.irq;
spi->bits_per_word = lookup.bits_per_word;
- spi_set_chipselect(spi, 0, lookup.chip_select);
/*
* spi->chip_select[i] gives the corresponding physical CS for logical CS i
* logical CS number is represented by setting the ith bit in spi->cs_index_mask
--
2.43.0.rc1.1.gbec44491f096
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