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regmap: mmio: Add regmap_mmio_get_min_stride
Splite the minimal stride parsing into one signal function. Signed-off-by: Xiubo Li <lixiubo@cmss.chinamobile.com> Signed-off-by: Mark Brown <broonie@kernel.org>
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9d98fa7129
commit
75fb0aaea1
1 changed files with 30 additions and 19 deletions
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@ -61,6 +61,33 @@ static int regmap_mmio_regbits_check(size_t reg_bits)
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}
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}
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static int regmap_mmio_get_min_stride(size_t val_bits)
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{
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int min_stride;
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switch (val_bits) {
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case 8:
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/* The core treats 0 as 1 */
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min_stride = 0;
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return 0;
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case 16:
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min_stride = 2;
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break;
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case 32:
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min_stride = 4;
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break;
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#ifdef CONFIG_64BIT
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case 64:
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min_stride = 8;
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break;
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#endif
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default:
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return -EINVAL;
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}
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return min_stride;
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}
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static inline void regmap_mmio_count_check(size_t count, u32 offset)
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{
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BUG_ON(count <= offset);
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@ -231,25 +258,9 @@ static struct regmap_mmio_context *regmap_mmio_gen_context(struct device *dev,
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if (config->pad_bits)
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return ERR_PTR(-EINVAL);
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switch (config->val_bits) {
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case 8:
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/* The core treats 0 as 1 */
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min_stride = 0;
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break;
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case 16:
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min_stride = 2;
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break;
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case 32:
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min_stride = 4;
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break;
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#ifdef CONFIG_64BIT
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case 64:
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min_stride = 8;
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break;
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#endif
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default:
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return ERR_PTR(-EINVAL);
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}
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min_stride = regmap_mmio_get_min_stride(config->val_bits);
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if (min_stride < 0)
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return ERR_PTR(min_stride);
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if (config->reg_stride < min_stride)
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return ERR_PTR(-EINVAL);
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